Sunday, June 30, 2013

Two From Humana By Jerry Brainum

You’d think obtaining accurate information about sports nutrition would be simple, given the plethora of Internet sites that regularly discuss the topic. Unfortunately, I’ve found that most of the “information” online is based on anecdotal evidence or how any particular supplement is viewed by an individual—or thinly disguised commercial hyperbole. Many Internet forums are populated by company shills who claim unbelievable gains made after using certain supplements.

A major source of information for me over the years has been textbooks related to nutrition. Most are scientifically based and are not commercial in any way. Problem is, those texts are often poorly written or assume that readers have an academic background in biochemistry and chemistry.

More recent texts seem to have overcome these problems. Two perfect examples are Nutritional Supplements in Sports and Exercise and Essentials of Sports Nutrition Supplements, both recently published by Humana Press. They contain completely accurate and easily understood information and do not require you to have completed a college science curriculum.

Essentials of Sports Nutrition Supplements is the official textbook of the International Society of Sports Nutrition and is a study resource for obtaining a credential with the organization. Some of the chapters related to physiology tend to veer into technical language, but the meat and potatoes of the book—discussions of protein, fat, carbs and various supplements—are based on the latest published research, devoid of commercial overtones and easy to understand.

Nutritional Supplements in Sports and Exercise begins by discussing legal and psychological aspects of sports supplements, followed by chapters on the nutrient and hydration needs of athletes and those engaged in regular exercise. Part three holds special interest if you’re engaged in bodybuilding. You’ll find chapters on how muscle-mass and weight-gain supplements work, which weight-loss supplements are effective and which don’t work as advertised and effective nutrient combinations that help build muscle and strength without side effects. Other chapters discuss recovery supplements and meal timing. All the chapters are written in an easily understood style that requires no science background or technical expertise.

The books are particularly useful for personal trainers, coaches and anyone who wants to know the scientific details related to sports nutrition but doesn’t want to be assaulted by the commercial nonsense rampant in most other places.

©,2013 Jerry Brainum. Any reprinting in any type of media, including electronic and foreign is expressly prohibited.
 

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Friday, June 14, 2013

Creatine: Does It Prime or Pinch the Pump? By Jerry Brainum

    One indirect gauge of the effectiveness of sports supplements is the amount of criticism directed at them. Supplements that work as advertised seem to attract more attention. Examples include ephedrine-and-caffeine combinations that were banned for one year by the FDA due to often dubious adverse-effect reports, then restored to the market by a federal judge because of a lack of sufficient scientific evidence concerning their potential dangers to health when used in suggested doses, only to be banned again soon afterward. Another example is the pro-hormone supplements, which fell victim to the ongoing hysteria about anabolic steroids. The final versions of them were remarkably effective and produced few or no side effects when used as directed. Their biggest problem was that they attracted too much attention—and because a few of them actually were anabolic steroids or contained so-called designer steroids. That last generation of prohormones, officially banned in 2005, did prove to be toxic in many cases, especially to the liver. Small wonder they many turned out to be old, discarded steroids that were developed by drug companies, but never released.
     It was perhaps only a matter of time before creatine was accused of endangering health. That’s evident in reports that it is linked to kidney failure, muscle cramps and liver damage, none of which are even remotely true.
    Some reports to the FDA have even claimed that using creatine led to heart problems. Since creatine is a natural constituent of the human body, synthesized from amino acids in the liver, pancreas and kidneys, it’s hard to justify an accusation like that. Nevertheless, a recent case report linked the use of supplemental creatine to atrial fibrillation, a disturbance of heart rhythm.1
    Atrial fibrillation involves a disturbance in the contraction of the atrial, or upper chambers of the heart. The incidence of this disorder doubles with each decade of life, so it’s far more common in older people. The most frequent cause is long-term hypertension, or high blood pressure, which may damage the heart. The errant heart rhythm may lead to more clots being released into the blood—embolisms that may then travel to the brain, inducing stroke. Doctors prevent that effect by providing anticoagulants, such as Warfarin, to those afflicted with the condition.
    When atrial fibrillation occurs without any evidence of structural heart damage, it’s called lone atrial fibrillation. While it’s rare in younger people, it can be produced by scar tissue forming in the atrial chambers of the heart, hypersensitivity due to neural stimulation of the heart or an inflammation in the heart. The most common causes, however, are drug use, including excessive caffeine intake, acute alcohol intoxication and using too much thyroid drugs (many bodybuilders have experienced it after using excessive amounts of the thyroid drug Cytomel).
     In the case study, a 30-year-old man without any prior evidence of heart problems reported to a hospital emergency room, complaining of heart palpitations and rapid breathing, both of which had occurred abruptly within the previous 48 hours. An electrocardiogram indicated atrial fibrillation. The man denied using any drugs, and none showed up in his medical tests. He did, however, admit to using creatine supplements. He’d begun by taking 20 grams a day for five days, a loading phase, followed by a maintenance dose of 2.5 grams daily for one month.
    That much creatine produced cramping and diarrhea, so he curtailed it for a month, then switched to a capsule form. He developed the heart symptoms while taking a loading dose of the creatine capsules. He was treated with intravenous drugs to prevent clot formation and to stabilize his irregular heart rhythm. That proved effective, as his heart returned to normal rhythm in eight hours. He was discharged within 24 hours and told to take aspirin and a beta-blocking drug for his heart.
     In discussing this man’s case, the author asserts that since creatine is known to cause dehydration and diarrhea, that may have caused an electrolyte, or mineral, imbalance that led to the atrial fibrillation. Yet the man’s primary electrolytes, potassium and magnesium, were within normal values. While it has been frequently reported anecdotally that creatine causes dehydration, there’s no documented evidence in the medical literature that points to it. Since creatine may promote a shift of water from extracellular to intracellular compartments in the body, it may adversely affect electrolyte balance that way, but that would happen only during restricted fluid intake. The odds that creatine would cause an effect significant enough to produce a lone atrial fibrillation are remote at best.
      So why did the man in the study experience atrial fibrillation after he took creatine? He may have had an inherent sensitivity to creatine, or the creatine may have induced a neural stimulation of his heart. The latter effect is more likely, since the man was a vegetarian, and vegetarians have lower creatine stores in their bodies. The loading dose may have had a druglike effect on him. The solution would be to avoid the creatine load, which is a dubious technique anyway, and take no more than five grams, or one teaspoon, a day. In 30 days that will result in the same level of creatine storage in muscle as a one-week load, minus any possible side effects.
    One other aspect to consider is that if anything, creatine would be beneficial for the heart. A feature of heart failure is the lack of production of energy compounds, such as ATP. Anything that boosts ATP production in the heart would aid heart function. Several supplements, such as coenzyme Q10, ribose and creatine, have all been shown to do just that.

1 Kammer, R.T. (2005). Lone atrial fibrillation associated with creatine monohydrate supplementation. Pharmacotherapy. 25:762-764.


©,2013 Jerry Brainum. Any reprinting in any type of media, including electronic and foreign is expressly prohibited.

Please consider joining this blog by clicking on the blue "join this site" button to the right of this blog. This will ensure that new blogs continue to be published. It costs nothing, and takes only a few seconds. Thank you.

 

See Jerry's book at      www.jerrybrainum.com