Posts Tagged ‘supplementation’

A Temple University researcher seeking physiological evidence of chronic fatigue syndrome (CFS) has found a link between creatine and metabolic energy. The findings, which hold promise for future CFS treatments, were published in a recent issue of the Journal of Applied Physiology.

“We found that creatine affects mitochondria – the parts of the cells that produce energy for all biological functioning – in normal human subjects. Now that we have established this baseline evidence, we are looking at the link between creatine and energy production in CFS patients,” said lead author Sinclair Smith, Sc.D., assistant professor of occupational therapy in Temple’s College of Health Professions.

Creatine, thought to build muscle and improve performance, is a popular over-the-counter supplement used by athletes. Smith and his colleagues wondered if creatine could also be used to help relieve the extreme physical and mental fatigue that strikes CFS sufferers. “Many physicians still don’t believe that CFS exists, making it important to investigate possible physiologic differences and to determine if we can impact metabolic function in CFS patients,” explained Smith.

“In addition to improving muscle metabolic function, recent studies show that creatine supplementation may improve nervous system function as well. Given that cognitive fatigue is a frequent symptom of CFS, we thought that creatine may enhance both muscle and neural metabolic status in people with CFS,” said Smith.

In the study, “Use of phosphocreatine kinetics to determine the influence of creatine on muscle mitochondrial respiration: an in vivo 31P-MRS study of oral creatine ingestion,” the researchers analyzed the effect of naturally -produced and supplemental creatine on the rate of muscle metabolism using non-invasive magnetic resonance imaging (MRI) techniques during exercise and rest.

While previous studies have evaluated the link between creatine and mitochondria in animals and human muscle samples, Smith’s was the first lab to test in people.

Smith collaborated in this research with the U.S. Army Research Institute of Environmental Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston University and Sargent College of Health and Rehabilitation Sciences.

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    Article adapted by MD Sports from original press release.
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Cereal and non-fat milk is as good as a commercially-available sports drink in initiating post-exercise muscle recovery.

Background

This study compared the effects of ingesting cereal and nonfat milk (Cereal) and a carbohydrate-electrolyte sports drink (Drink) immediately following endurance exercise on muscle glycogen synthesis and the phosphorylation state of proteins controlling protein synthesis: Akt, mTOR, rpS6 and eIF4E.

Methods

Trained cyclists or triathletes (8 male: 28.0+/-1.6 yrs, 1.8+/-0.0 m, 75.4+/-3.2 kg, 61.0+/-1.6 ml O2 * kg-1 * min-1; 4 female: 25.3+/-1.7 yrs, 1.7+/-0.0 m, 66.9+/-4.6 kg, 46.4+/-1.2 mlO2 * kg-1 * min-1) completed two randomly-ordered trials serving as their own controls. After 2 hours of cycling at 60-65% VO2MAX, a biopsy from the vastus lateralis was obtained (Post0), then subjects consumed either Drink (78.5 g carbohydrate) or Cereal (77 g carbohydrate, 19.5 g protein and 2.7 g fat). Blood was drawn before and at the end of exercise, and at 15, 30 and 60 minutes after treatment. A second biopsy was taken 60 minutes after supplementation (Post60). Differences within and between treatments were tested using repeated measures ANOVA.

Results

At Post60, blood glucose was similar between treatments (Drink 6.1+/-0.3, Cereal 5.6+/-0.2 mmol/L, p<.05), but after Cereal, plasma insulin was significantly higher (Drink 123.1+/-11.8, Cereal 191.0+/-12.3 pmol/L, p<.05), and plasma lactate significantly lower (Drink 1.4+/-0.1, Cereal 1.00+/-0.1 mmol/L, p<.05). Except for higher phosphorylation of mTOR after Cereal, glycogen and muscle proteins were not statistically different between treatments. Significant Post0 to Post60 changes occurred in glycogen (Drink 52.4+/-7.0 to 58.6+/-6.9, Cereal 58.7+/-9.6 to 66.0+/-10.0 mumol/g, p<.05) and rpS6 (Drink 17.9+/-2.5 to 35.2+/-4.9, Cereal 18.6+/-2.2 to 35.4+/-4.4 %Std, p<.05) for each treatment, but only Cereal significantly affected glycogen synthase (Drink 66.6+/-6.9 to 64.9+/-6.9, Cereal 61.1+/-8.0 to 54.2+/-7.2%Std, p<.05), Akt (Drink 57.9+/-3.2 to 55.7+/-3.1, Cereal 53.2+/-4.1 to 60.5+/-3.7 %Std, p<.05) and mTOR (Drink 28.7+/-4.4 to 35.4+/-4.5, Cereal 23.0+/-3.1 to 42.2+/-2.5 %Std, p<.05). eIF4E was unchanged after both treatments.

Conclusion

These results suggest that Cereal is as good as a commercially-available sports drink in initiating post-exercise muscle recovery.

Author: Lynne Kammer, Zhenping Ding, Bei Wang, Daiske Hara, Yi-Hung Liao and John L. Ivy

Credits/Source: Journal of the International Society of Sports Nutrition 2009, 6:11