The Anti-Aging Properties Of Weight Training & Resistance Exercise

December 29th, 2011 Kevin Richardson No comments

The Anti-Aging Properties Of Weight Training & Resistance Exercise

As you read this article you, like every other person alive on the planet, are getting older. From the moment we are born, we begin to age but unfortunately, most of us don’t really pay any mind to getting older until we start seeing tangible signs of the passage of time on our body. Thanks to advances in medical technology and improvements in living conditions. people are living longer than ever. So much so that by the year 2030, there will be more than twice the number of Americans over the age of 65 than there was in the year 2000.[1] Unfortunately, here in the West the very process of aging is looked upon as an illness in dire need of ‘treatment’- a way of thinking based on the fact that for most Americans aging is indeed a narrative of decline. Increased body fat, significant loss of muscle mass and strength to the point of infirmity in addition to the slew of age associated conditions such as cardiovascular disease, diabetes, hypertension and osteoporosis are erroneously seen as an inevitable consequence of growing older. However, studies of older individuals who regularly engaged in weight training and bodybuilding have always challenged the idea that such infirmities come more as a self-fulfilling prophecy as a result of inactivity and poor dietary choices than a fate that we are all destined to suffer.[2] In this article, we will take a look at the physiological aspect of aging and how weight training and resistance exercise can create what gerontologists today term successful aging- namely getting older with a low probability of disease or physical disability, maintaining high cognitive and physical function and having an active engagement with life in your later years.[3,4]

Understanding The Mechanisms Of Aging
So, how exactly does aging occur? We can easily see the results of aging but there are certain biological mechanisms at work that we are often unaware of. The number cells that make up our body are kept at a relatively steady number through the process of mitosis (cells dividing) matched by the number of cells dying. This balance (homeostasis) is necessary for optimal health and body function however this equilibrium cannot be maintained indefinitely. In what is called the Hayflick limit, all animal cells have a limited number of times that they can reproduce. As we get older, senescence sets in- which is a decline in the ability of our bodies’ cells to divide. This usually starts in our early thirties and continues on throughout our lives. One prevailing theory is that the everyday occurrence of cellular reproduction leads to cumulative damage to our DNA and cells begin to die or not function correctly. This process, called apoptosis is actually beneficial as it acts a way of ‘cleaning up’ that benefits the healthy remaining cells. Taken as a whole, aging thus is nothing more than our bodies decline in being able to deal with stress. Maintaining homeostasis becomes more and more difficult until a point is reached where the organism dies.

The Role Of Weight Training In The Prevention of Muscle Wasting

Building muscle however through the use of a well executed weight training program of sufficient intensity is a way of increasing our bodies’ potential response to stress. As we get older, one of the main aspects working against us from being as strong and as built as we were in our younger years is sarcopenia. Sarcopenia which means literally ‘poverty of the flesh’, refers to the loss of skeletal muscle mass that comes with aging which in turn leads to weakness and frailty. For the average member of the population, as much as 50% of your skeletal muscle mass is lost between the ages of 20 and 90 years resulting in in a corresponding reduction in muscular strength. Such loss of muscle mass is usually associated as well with an increase in overall body fat. However as normal an occurrence this might be for most of us, studies suggest that lack of exercise- or more specifically weight bearing resistance exercise (like weight training) may be one of the overriding causes of sacropenia.[5]

We don’t have to lose such large amounts of muscle mass as we age, but without an active lifestyle that incorporates some form of resistance exercise over the course of time our bodies will indeed fall victim to the syndrome of ‘use it or lose it.’ While it would be absurd to think that weight training can allow you to be strong and muscular as you were in your twenties, preliminary research shows that those who engage in intense weight training over the course of their lifetime are able to demonstrate physical qualities and abilities on par with if not exceeding that of untrained individuals in their twenties while well into their fifth decade of life. With most of our medical anti-aging focus resting on the shoulders of pharmaceutical companies trying to find a pill form solution to the combat the effects of the march of time, comparatively little is invested in researching protocols that are far less potentially lucrative such as weight training. Nevertheless, short term studies thus far do indeed show that resistance exercises like weight training increase the ability of our muscles to synthesize proteins and thus minimizing the advent of skeletal muscle decline over the years. [6,7]

Getting Older- A Detailed Look At The Physiology

As we get older, it is not only our muscles that get significantly weaker without physical activity but also our bones. Increased bone porosity and reduction in bone mass can lead to the debilitating effects of osteoporosis. Which as we know can be both reversed and prevented by the implementation of weight bearing activities such as weight training.[8] (Read my article on how weight training prevents osteoporosis here). There are some aspects however that are beyond our control, as with the advancing years comes a natural decrease in the speed of nerve conduction, reduction in peak cardiovascular ability as well as a decline in kidney and other organ function. As mentioned earlier in an explanation of the Hayflick limit- our cells have a limited number of reproductions- and as you get older the motor units (motoneurons) in your fast twitch muscles begin to die. You don’t immediately notice it, as our bodies have a remarkable system of compensating. Consider that a muscles in your leg may have 250 motor units with each motor unit having as many as a thousand muscle fibers under its control.

This ratio of motor units to muscle fiber is known as an innervation ratio and in this case would be 1,000 muscle fibers per motoneuron.
Over the course of time, those 250 motor units in your leg muscle may drop by as much as half to 125 by the time you are 70 years old, and you would think that this would make you only half as strong, but it isn’t that straightforward. You see, we lose muscle fibers at a much slower rate than motor units so you would have only lost 10% of the muscle fiber in that leg muscle by the age of 70. However, the remaining 125 motor units sprout new branches to the muscle fibers that have lost their motor units to activate them and do more work than they did before. As a result, there is a higher innervation ratio, in this example it would be let us say 1,500 muscle fibers per motoneuron as our motor units take control of more muscle fibers as a way of helping us retain our strength as we get older.

Our nervous system also slows with the passage of time and so the mechanisms of muscle contraction slows down as well. Despite these natural declines, regular resistance type exercise and an overall active lifestyle can help minimize and offset the effect of these changes in our bodies. The more muscle mass built up over time, the more strength, coordination and motor skills you will have as you get older. A point lost sadly on the millions of women who invest most of their time pursuing aerobic type exercises and lower impact activities like yoga out of a misplaced fear of developing man-sized muscles and thus curtail their involvement in weight training- the very exercises that will help them stay looking and feeling younger as the years go by. (See my article on Should Women Weight Train Like Men)

Hormone Replacement Isn’t Always The Answer
Our hormones also play a role in the reduction of our muscle mass as we get older. Testosterone, growth hormone and insulin-like growth factor (IGF) help our bodies’ build and maintain muscle mass but there is a marked reduction in production as we get older. High intensity weight training has been shown to increase all three hormones [9,10,11] naturally and within standard human parameters. It might sound like a good idea to forgo weight training and instead turn to hormone replacement therapies but research shows that this reduction in hormones may be a key mechanism that allows us to live longer. Mammalian models with reduced growth hormone (GH) and/or IGF-1 appear to live longer[12,13] and while the administration of testosterone replacement therapy for men has become a lucrative and fast growing industry here in the United States, presently available data do not justify the broad use of such hormones for anti-aging purposes.[14,15]

Effects Of A Lifetime Of Weight Lifting On the Aging Process

Kenny Hall- an example of the anti-aging effects of weight training

My inspiration- Kenny Hall pictured in his early seventies

While it is established that there is a natural decline in our bodies from the age of 30 or so due to the processes mentioned above- there are also many examples of individuals who defy the narrative of decline for far longer than one would expect. In 1987, Dr. Fredrick Hatfield- (or Dr. Squat as he is affectionately known) set a world powerlifting record squatting over 1,000 lbs at the age of 45- more than any human being in history had ever successfully lifted in competition. A feat he was able to continue well into his fifties. My good friend and natural bodybuilder Kenny Hall started competing in his twenties and kept on winning titles for the next half a century. His greatest accomplishment was winning the Pro Mr. America in 1969 but he maintained a level of muscle mass and definition that allowed him to easily best other competitors decades younger than he was until he retired in his 70’s so that others would have their chance to win as well.

The science of Gerontology has only just started to pay attention to the amazing examples set by those engaged in a lifetime of weight training and drug free bodybuilding and research reveals that involvement in such activities can ‘create possibilities for people to age positively and reconstruct what aging “normally” means.”[2,16,17,18] Such studies also highlight the self fulfilling prophecy that our society’s acceptance of advancing age as a time of disengagement, dysfunction and disease goes a long way in our not taking action to prevent it from being just that. As long as we see aging as a downward trajectory of physical and mental deterioration, we are doomed to experience it as such. One of the common perspectives of men and women involved in weight training activities over the course of their lives and who exhibit remarkable physicality into the later sixth decades of life is what was termed a ‘mondadic styled’ body. In short, they focused on who they were and what they were doing as opposed to being influenced by what society expected them to be or the examples of their peers whose aging process tended to follow the narrative of decline that we are so used to hearing. Without turning to hormonal solutions that can often cause more problems than they solve, these individuals centered themselves on following a lifestyle. A lifestyle that allows them to significantly offset the impact of aging and achieve what we are all looking for- twilight years that aren’t defined by disease and disability but by engagement with life on all levels. We don’t need drugs or DeLeon’s fabled fountain of youth, we just need to make certain forms of exercise a part of our lives at all times.

Do You Need Milk For Strong Bones And Optimal Health?

November 3rd, 2011 Kevin Richardson No comments

Do You Need Milk For Optimal Health & Strong Bones? Marketing Says Yes But Science Says No.

“Milk helps build strong bones and teeth!”

Like many, I first heard this mantra when I was a child in elementary school and it is a message that is firmly ingrained in the minds of most as one of the few universal truths in nutrition. The need for dairy products as an irreplaceable part of the human diet for building and maintaining strong bones and warding off the ravages of osteoporosis is considered common knowledge, an unshakable truth, and a message repeated ad nauseum in the media. A message that few would find reason to question. It’s no secret that milk contains calcium- a key mineral for maintaining bone health. Thus there would appear to be little reason to question it’s importance as a protective shield against bone loss. As popular and seemingly rational an idea as it may be, the scientific evidence doesn’t support it. Very early in my career I myself was quite surprised to learn that my early indoctrination to the health benefits of dairy consumption didn’t come from credible peer reviewed scientific research, but from a rather successful marketing campaign on the part of the dairy industry. A campaign influential enough to have the US government (and many others around the world) classify milk as a food group- a decision made based on profit and not sound nutritional science.

Contrary to popular belief billions of people on the planet do just fine without having milk as a part of their diet. Not hundreds of thousands or millions, but billions. Surprisingly enough, people in countries where milk consumption is minimal have some of the lowest incidences of osteoporosis and hip fractures on earth. A revealing statistic that somehow never seems to find its way to American audiences, nor does the fact that for hundreds of thousands of years milk most humans on the planet didn’t drink milk and that many enjoy rather robust health without it. There is a reason for our rather myopic understanding of milk and what it can and cannot do for us and it’s the dairy industry. The reach of the dairy industry’s influence is impressive to say the least, spreading information designed to help them sell more milk not just nationally but globally.

Using a consumer creating model sanctioned by government entities, teaching material for young children in schools about the role of milk in building strong bones and teeth is graciously supplied by the American Dairy Council. Presented as educational material at an early age, such influence affects our perception of milk as a required part of our diets and it is hard, if not impossible for a child to question such authoritative information. An effective model that ensures that as adults the party line that milk is a requirement for optimal health is firmly rooted in our core set of beliefs. It’s a similar methodology used by fast food chains like McDonald’s to market to children, knowing fully well that it will guarantee another generation of customers.

Not only is milk taught at an early age to be an essential part of our diet, it is provided to us as well. As a food product produced far in excess of what we as a nation can consume thanks to heavy government subsidies secured by the dairy lobbies, it can be literally given away and dairy producers still make profits. With the early consumer marketing model in mind it thus makes sense that milk is distributed to young children in schools through government food programs. Good business as it helps to cement the thought process of milk being a necessity as an unquestioned view.

Milk & Calcium- Understanding The Science

As adults we are bombarded by messages and dairy lobby funded ‘studies’ reminding us about the calcium content of milk and dairy products. Most notably for women and the steadily aging American population, mill’s supposed prophylactic effects against bone loss are emphasized. But can the calcium in milk really make a difference in bone density? Looking internationally at the dairy-equals-calcium-which-equals-strong-bones idea, we see clearly that the countries with the highest rates of osteoporosis are the largest consumers of dairy products.

The dairy consumption of countries like the United States, Australia, New Zealand, Switzerland, the UK and Northern Europe is enormous when compared to Asian countries such as China where dairy consumption is rare, yet those very countries where less dairy is consumed have they have the lowest rates of hip fracture and osteoporosis in the world.[1,2,3,4]

The Rate Of Osteoporosis & Hip Fracture Is Lower In Populations Who Do Not Consume Milk & Dairy Products.

To give an idea of the prevalence of osteoporosis, estimates are that 40% of American Caucasian women and 13% of Caucasian men aged 50 years will experience at least one bone loss related fracture in their lifetime. At age 50, a Caucasian woman has a 17% chance of sustaining a hip fracture, 15% chance of vertebral fracture and 16% chance for forearm fracture, with comparable figures of 6%, 5% and 2.5%, respectively, for fractures in white males.[2] Interestingly enough among the female African American population the age-adjusted prevalence of hip related osteoporosis is only 6%, compared to 17 % for postmenopausal White women- difference consistent with the much lower fracture rates observed in African Americans.[5] African Americans, by the way consume almost 40% less milk and dairy products as their Caucasian counterparts[6] which if by itself renders the milk/dairy-equals-strong-bones theory to be questionable.

Statistics from the observation of low dairy intake in Asian population contradict the milk/dairy-equals-strong-bones theory completely. Using China as an example, where cheese and other popular dairy products are not a part of their regular diet and where milk consumption is 10% of the American per capita consumption rate[7] age standardized incidences of hip fractures is far lower than their milk drinking American and European counterparts. Based on the 1990 China census figures hip fracture rates were only 87 per 100,000 for women and 97 per 100,000 for men. Contrast these numbers with 510-559 per 100,000 for white American women and 174-207 per 100,000 for American Caucasian men[8]. In fact, hip fractures in Beijing are reportedly among the lowest rates of occurrence in the world- and with a population where milk is by no means a staple.

Debunking The Need for Milk- It’s The Calcium Lost Not Calcium Consumed That Causes Osteoporosis

As much as the good (and well paid) folks at the American Dairy Association would like you to think that increasing your calcium intake by drinking milk would decrease your risk of osteoporosis, the science behind this premise simply doesn’t support it. From what we do know about bone loss, it happens not so much from not having a high enough calcium intake, but rather from having a high level of calcium loss due to dietary and lifestyle choices. [8] According to the findings of the 1994 National Institutes of Health Consensus Conference, at least one third of calcium balance and bone density is dependent on the ratio of intake to loss and not solely on calcium intake alone as the marketing campaigns would have you believe. To be frank, meta analysis of literature meeting the provisions for unbiased scientific research found there were no significant relationships proved between milk consumption or any other dairy product to measures of bone health nor were there no correlations between calcium intake and bone loss.[9,10,11,12] Similarly, an 18 year analysis of 72 337 postmenopausal women published in the February 2003 American Journal of Clinical Nutrition, found that an adequate vitamin D intake was associated with a lower risk of osteoporotic hip fractures in postmenopausal women. Neither milk nor a high-calcium diet in the study had any correlation with a reduction in risk of osteoporosis.

Milk Isn’t The Only Source Of Calcium

So we have established that bone loss has little to do with intake, but for those concerned nevertheless about their calcium intake, it should be noted that a 1990 report in the American Journal of Clinical Nutrition found that green leafy vegetables such as broccoli and kale have high levels of calcium and is absorbed at least as well as the calcium in milk. [12,13,14] Proper calcium balance on a non-dairy diet is easily attained because ALL vegetables and legumes contain calcium.[15] Thus within the context of a balanced diet it is more than adequate to prevent frank deficiencies which are rare to nonexistent in developed countries such as the United States.[16]

In terms of the ultimate source of calcium, however no other food source can compete with the bioavailability of calcium from bones. That’s right, bones. You don’t hear much about it since eating bones isn’t that popular here in the United States and given that both dairy producers and supplement manufacturers would be hard pressed to sell their wares if the general population was aware that eating small amounts of bone is how humans got most of their calcium for several hundred thousand years. The small and soft bones of fishes like sardines are a perfect source of calcium in a form our bodies can easily absorb, as is the use of bone meal that can be added to soups and broths. Since these sources are better absorbed (and it makes sense that bones would be the best source of building material for bones) our body retains more of it as opposed to being mostly excreted in urine as is often the case with dairy products and artificial supplements.

Osteoporosis is a very real concern for many women, as they make up 80% of those affected by this condition. Osteoporosis is a major public health threat for an estimated 44 million people here in the United States with almost 10 million individuals estimated to already have the disease and almost 34 million more are estimated to have low bone mass, placing them at increased risk for osteoporosis. It is time we paid more attention to what has been proven to be real risk factors, such as soda consumption, high sodium diets, smoking, excessive caffeine consumption, alcohol and an inactive lifestyle , than simply falling for the marketing hype that somehow drinking milk or eating yogurt and cheese will magically protect you from low bone density.

Getting the recommended daily allowance of calcium at all ages is important, preferably from dietary sources. But bone nutrient requirements are wide and far more complex than simply drinking milk or taking a calcium supplement. A diverse diet of natural foods that includes meat, fish, fresh vegetables, fruits and nuts will always cover the diverse nutritional needs of our bones as long as we stay away from high fat, high sugar and high sodium processed foods. Limit high fat protein sources, keep your salt intake low, reduce your alcohol consumption and don’t smoke and you’ll be fine. Also important is the amount of time spent outdoors. Get sunlight on your skin at safe times of the day for vitamin D as it plays an integral role in helping our body use calcium efficiently. As much as commercials warn us of the dangers of sunlight, recent studies have suggested that avoidance of sunlight is associated with higher risks of certain cancers- which should not be surprising as we did in fact evolve outdoors and not in the confines of fluorescently lit cubicles.

Dairy Products and Weight Gain

As early as the 1950’s when bodybuilders wanted to decrease body fat and increase their muscular definition the first thing they would cut out of their diet was milk and dairy products. Among natural bodybuilders who don’t resort to the use of powerful and potentially dangerous drugs to get into shape, milk and dairy products are a big no-no when trying to reduce body fat- whey protein shakes as well (see my article on protein shakes here). A mixture of water, sugars, fats and salt, milk is in essence nature’s ultimate weight gain formula, helping infant mammals increase their body mass significantly in relatively short periods of time. Milk helps baby elephants and cows pack on hundreds of pounds and interestingly enough, no adult mammal living in a natural environment drinks milk past infancy. Only humans and the animals we train drink milk as adults and it bears mentioning that the very countries with the highest dairy consumption are also the ones with the highest rates of obesity.

Finally, it is important to stress the role of exercise and not diary intake as a way of increasing bone density. Weight training in particular plays a poignant role in maintaining and building healthy bone mass levels (Read my article here on weight training and osteoporosis). It’s a simple and scientifically proven way for prevention of low bone mass and in helping those with low bone mass levels build up their bones. So put down that glass of milk and start pumping some iron!

References:

1. Xu L, Lu A, Zhao X, Chen X, Cummings SR.Very low rates of hip fracture in Beijing, People’s Republic of China the Beijing Osteoporosis Project. Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Beijing, People’s Republic of China. Am J Epidemiol. 1996

2. Cummings SR and Melton LJ (2002) Epidemiology and outcomes of osteoporotic fractures. Lancet 359:1761.

3. Kanis JA, Johnell O, De Laet C, et al. (2004) A meta-analysis of previous fracture and subsequent fracture risk. Bone 35:375.

4. Kanis JA and Johnell O (2005) Requirements for DXA for the management of osteoporosis in Europe. Osteoporos Int 16:229.

5. Melton LJ, Cooper C 2001 Magnitude and impact of osteoporosis and fractures. In: Marcus R, Feldman D, Kelsey J (eds.) Osteoporosis

6. Gender and ethnic differences in intakes of dairy foods and related nutrients, obesity, and metabolic outcomes: NHANES, 1999–2004

7. Per Capita Consumption of Milk and Milk Products in Various Countries, International Dairy Federation, Bulletin 423/2007.

8. Heaney, R.P., Evaluation of publicly available scientific evidence regarding certain nutrient-disease relationships

9. Wachman, A., et al. Diet and osteoporosis. Lancet May 4, 1968, p. 958.

10, Recker, R., The effect of milk supplements on calcium metabolism, bone metabolism, and calcium balance. American J Clin Nutr 1985; 41:254.

11. Nilas, L. Calcium supplementation and post menopausal bone loss. British Medical Journal 1984; 289: 1103.

12. Kolata, G. How important is dietary calcium in preventing osteoporosis? Science 1986; 233: 519-20.

13 Institute of Medicine. Dietary reference intakes for calcium, phosphorus, magnesium, vitamin D, and fluoride. Washington, DC: National Academy Press, 1997.

14. Alaimo K, McDowell MA, Briefel RR, et al. US Department of Health and Human Services. Dietary intake of vitamins, minerals, and fiber of persons ages 2 months and over in the United States: third National Health and Nutrition Examination Survey, Phase 1, 1988–91. Hyattsville, MD: National Center for Health Statistics, 1994. (Advance data from vital and health statistics no. 258.)

15. Weaver CM, Plawecki KL. Dietary calcium: adequacy of a vegetarian diet. Am J Clin Nutr 1994;59(suppl):1238S–41S

16. Dietary Supplement Fact Sheet. US Office of Dietary Supplements

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How Weight Training Builds Stronger Bones And Prevents Osteoporosis

June 23rd, 2011 Kevin Richardson No comments

Weight Training Builds Stronger Bones And Helps Prevent Osteoporosis

Osteoporosis is an ever increasing problem worldwide as people are living longer and the population continues to age. More prevalent among women than men, some estimates report than as many as one in five American women over the age of 50 have osteoporosis. An insidious disease that weakens bone tissue, one of the worst aspects of osteoporosis is that there are no symptoms during the early stages and without a bone mineral density test it can be difficult to detect before it advances to a point where it becomes painfully symptomatic. Most learn of their condition after experiencing a bone fracture as about half of all women over the age of 50 will suffer a fracture of the wrist, hip or spine as a direct result of bone loss. Osteoporosis can be caused by many different factors which are usually lifestyle or hormone related. Excessive alcohol consumption, smoking, poor diet and inactivity are some of the known risk factors as are other circumstances which are not as controllable such as family history or hormone treatments. While there are effective treatments available for osteoporosis today the best defense is to prevent it altogether. Exercise, specifically weight bearing exercise has been shown to be an effective preventative measure against osteoporosis. In an earlier post How Muscles Get Bigger And Stronger we explored how muscles respond to weight training and in this article we will take a look how bones benefit as from resistance exercise.

The word ‘osteoporosis’ means porous bones and one can easily understand that a bone that’s porous would be weak and vulnerable to fractures. Bones weaken as a result of a process called demineralization. Demineralization occurs when our bones lose important minerals such as calcium. If left untreated our bones will no longer have the structural capacity to support the weight of our body and the forces we create when we are physically active- thus resulting in a fracture. Since we can see them all the time most of us are very much aware of our muscles, but we don’t think much of how our bones work in conjunction with them. When you flex your muscles as in a biceps curl for example, the muscles of your biceps generate force that allows you to lift the weight. This force is transferred throughout the muscle and to the tendons at both ends. The tendons are connected to the bones of your arm and cross over your elbow joint. Joints act as levers- which are rigid objects used with a pivot point to increase the amount of mechanical force our body generates to allow us to lift an object. Activation of the biceps muscles in our upper arm causes rotation of the forearm at the elbow (pivot point) which allows us to lift the weight during a curling exercise. Now according to Newton’s third law of motion, for every action there is an equal and opposite reaction. That being said since bones provide the framework for our muscles every muscular contraction will produce forces that act directly on the bones in our body.

Since bones provide the frame for our body tissue our skeleton is always under some degree of stress. As you read this blog post the force of gravity is bearing down on your bones even though you can’t really feel it. Too much stress can lead to bone damage at a microscopic level- in pretty much the same way it does in your muscles and like our muscles when bones are damaged they need to be be repaired. According to Wolff’s law, the bones in a healthy person or animal will adapt to the loads they are placed under so if the forces acting on a bone increases, the bone will remodel itself over time to become stronger and denser to be able to cope with the load that it has to bear. In essence it’s a stress response in keeping with the laws of general adaption. From a physiological point of view, stress isn’t always a bad thing as we perceive it in our everyday lives. Quite simply stress is the reaction of our body to stimulation or forces that puts it out of balance- ( a balance that we refer to as homeostasis.) If the forces are too great or too sudden – like the forces acting on your bones during a car accident or a fall from a great height- your bones can’t adapt fast enough or deal with the sudden overload and a fracture will occur. Also if a force is continuously applied through repetitive strain and your bones don’t have enough time to rest and recuperate it can also result in a fracture- in this case a stress fracture. This is what happens to many runners and aerobics aficionados after years of doing the same activity over and over again. On the other side of the spectrum, if there is a reduction in the forces on your bones, be it from being bed ridden or from living a predominantly sedentary lifestyle, your bones will remodel themselves to be weaker and less dense as a result. Just like your muscles if you don’t use it- you lose it.

Understanding How Bones Get Stronger

How your bones get stronger and denser depends not only on the degree of stress placed on them, but also on the availability of minerals such as calcium which is required to change its structure. Bones are made of collagen which is the primary form of protein found in connective tissues throughout your body. The difference between bone tissue and other forms of connective tissue is that the collagen in our bones are infused with minerals which makes it solid. When a bone is subjected to overload (from an activity like weight training for example) it experiences tiny cracks and fissures. These cracks need to be filled and reinforced so that the bone will not be damaged in the future by a similar load and thus starts a signal that mobilizes our bones to repair itself. In a process called resorption, cells called osteoclasts dissolve and break up very thin pieces of bone in the damaged area. (Think of osetoclasts as tiny construction workers who smooth over the damage done to your bones- very much the same way you would sand down a piece of wood if it was cracked before you repaired it.) After this part of the process is completed other cells called osteoblasts come in and fill in the smoothed cracks left behind by the action of the osteoclasts. (Think of osteoblasts as tiny construction workers who fill in the holes sanded down out by the osteoclasts.) This is capped off by the mineralization of the entire area which makes the bone denser and stronger than it was before- a series of actions known as bone remodeling. Bone remodeling can be affected not only by mechanical forces acting on our bodies but also by parathyroid hormones and estrogen.

How Weight Training Builds Stronger Bones

Just as muscles won’t get stronger unless there is an load applied to them that it isn’t used to dealing with, the same logic applies to our bones. That being said, to stimulate the adaptive bone remodeling process there must be some degree of overload. Doing a compound exercise like squats with weights requires a large amount of force to be generated by the muscles of your thighs and lower legs. Forces that create bending and compressive pressure within the bones of your femur (located in your upper leg), tibia and fibula (located in your lower leg). These forces create changes in fluid pressure in your bones which in turn creates the micro-fractures that trigger the adaption response for increasing bone strength. Bones can tolerate a lot more force than muscles can, and that explains why non weight bearing exercises don’t have as much impact in building stronger bones as weight training. With weight training you can progressively increase the overload factor by simply increasing the weight as you get stronger (within reasonable margins of course.) With bodyweight exercises such as aerobics or calisthenics this isn’t always possible. If you start such forms of exercise after a period of being inactive then the new stress of such exercises will have a positive effect in helping build your bones (and muscles to a degree). But after an initial period of adaptation your bones (and muscles) will have no reason to keep getting stronger as they will comfortably be able to cope with the forces incurred during body-weight exercises. Even though the exercises may be physically challenging to you, you have to keep in mind that your bones were designed to easily bear the strain of physical activity involving the weight of your body.

Studies have found that high intensity resistance training exercises (weight lifting) are an effective and feasible means to preserve bone density.1 Not only are high intensity weight training exercises useful in terms of building stronger bones, but they also improve muscle mass, strength, endurance and balance while burning extra calories and reducing body fat. [2,3,4,5,6,7,8,9,10] It can also decrease your risk of heart disease, diabetes, hypertension and reduce the incidence of depression. So pick up some iron and start lifting some weights for stronger bones, a stronger body and a stronger mind.

How Muscles Get Bigger & Stronger

Kevin Richardson is an award winning health and fitness writer, one of the most sought after personal trainers in NYC and the creator of Naturally Intense High Intensity Training™. Get a copy of his free weight loss ebook here. If you live in the New York City area and need help losing weight or getting into shape give Kevin and his team a call at 1-800-798-8420. Check out Kevin’s personal training services here.

References:

1. High-intensity resistance training and postmenopausal bone loss: a meta-analysis.Martyn-St James M, Carroll S. Osteoporosis Int. 2006

2. High-intensity Interval Training: A Time-efficient Strategy for Health Promotion. Martin J. Gibala, PhD, Department of Kinesiology, McMaster University, Ontario, Canada Current Sports Medicine Reports 2007, 6:211-213

3. Impact of exercise intensity on body fatness and skeletal muscle metabolism. Tremblay, A. et al., Physical Activities Sciences Laboratory, Laval University, Quebec, Canada Metabolism.1994; 43(7): 814-818.

4. Effects of moderate-intensity endurance and high-intensity intermittent training on anaerobic capacity and VO2max.Tabata I, Nishimura K, Kouzaki M, Hirai Y, Ogita F, Miyachi M, Yamamoto K.-Med Sci Sports Exerc. 1996 Oct;28(10):1327-30.

5. Similar metabolic adaptations during exercise after low volume sprint interval and traditional endurance training in humans. Kirsten A. Burgomaster, Krista R. Howarth, Stuart M. Phillips, Mark Rakobowchuk, Maureen J. MacDonald, Sean L. McGee and Martin Gibala, J Physiol 586: 151-160, 2008

6. Effects of moderate-intensity endurance and high-intensity intermittent training on anaerobic capacity and VO2max. Izumi Tabata; Kouji Nishimura, Hirai Motoki, Futoshi Ogita, Motohiko Miyachi, Kaoru Yamamoto, National Institute of Fitness and Sports in Tokyo, Japan Medicine & Science in Sports & Exercise. 28(10):1327-1330, October 1996.

7. Impact of exercise intensity on body fatness and skeletal muscle metabolism. Tremblay, A. et al., Physical Activities Sciences Laboratory, Laval University, Quebec, Canada Metabolism.1994; 43(7): 814-818

8. Bahr R (1992). “Excess postexercise oxygen consumption–magnitude, mechanisms and practical implications”. Acta Physiologica Scandinavica. Supplementum 605: 1–70. PMID 1605041.

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High Intensity Training Workouts For Women Increases Bone Density

March 10th, 2010 Kevin Richardson No comments

High Intensity Training Workouts For Women Increases Bone Density In Post Menopausal Women

Osteoporosis is the loss of bone density over time and the most common type of bone disease. It is estimated that 1 out of 5 American women over 50 have osteoporosis. About half of all women over the age of 50 will have a fracture of the hip, wrist, or spine over the course of their lives and the leading causes of osteoporosis are a drop in estrogen in women at the time of menopause and a drop in testosterone in men. Most women shy away from the idea of weight training and high intensity training in general in favor of more aerobic type exercises and classes however more and more research is affirming that not only weight bearing exercise, but also high intensity training workouts can decrease bone loss- especially among postmenopausal women.

According to a study published in the Journal of American Medical Association, high intensity training using strength exercises have been shown to be an effective way to preserve bone density while also improving overall muscle mass, increasing strength and balance in postmenopausal women. The research was done at Tufts University in Boston, Massachusetts and the subjects ranged in age from 50 to 70 years old. Following a high intensity low volume protocol the 39 women involved exercised twice a week performing five different strength training exercises per session over the course of a year.

High Intensity Training Workouts For Women Increases Bone Density

The findings were quite significant- in the women doing high intensity training femoral neck bone mineral density and lumbar spine bone mineral density increased by approximately 1 to 4.5% while the inactive control group saw a similar DECREASE in bone density of the same regions. Total body bone mineral content was preserved in the strength-trained women while it tended to decrease in the sedentary women who were used as a control. Also of note, muscle mass, muscle strength, and dynamic balance increased in the strength-trained women and decreased in the inactive women.

High Intensity Training: A Proven Method For Preserving Bone Density & Improving Strength & Muscle Mass

The study’s conclusion: ’High-intensity training exercises for strength are an effective and feasible means to preserve bone density while improving muscle mass, strength, and balance in postmenopausal women.’

References:

1. High-intensity resistance training and postmenopausal bone loss: a meta-analysis.Martyn-St James M, Carroll S. Osteoporos Int. 2006

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Kevin Richardson- celebrity Personal Trainer New York City is the creator of Naturally Intense™ High Intensity Training, a lifetime natural bodybuilder, head of Naturally Intense™ Personal Trainers NYC and one of the most sought after personal trainer in NYC.