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Effects of a supplement designed to increase ATP levels on muscle strength, power output, and endurance
Herda, Trent J. Ryan, Eric D. Stout, Jeffrey R. Cramer, Joel T.
Herda, Trent J.
Ryan, Eric D.
Stout, Jeffrey R.
Cramer, Joel T.
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Abstract
Background: The present study examined the acute effects of a nutritional supplement intended
to improve adenosine triphosphate (ATP) concentrations on vertical jump height, isometric
strength of the leg extensors, leg extension endurance, and forearm flexion endurance.
Methods: Twenty-four healthy men (mean age ± SD = 23 ± 4 yrs, stature = 181 ± 7 cm, and body
mass = 82 ± 12 kg) volunteered to complete a familiarization trial plus 2 randomly-ordered
experimental trials separated by a 7-day washout period. Participants received either 6 (body mass
< 91 kg) or 8 (body mass ≥ 91 kg) tablets of the treatment (TR; 625 mg of adenylpyrophosphoric
acid and calcium pyruvate, 350.8 mg of cordyceps sinensis extract and yohimbine hydrochloride)
or placebo (PL; 980 mg of microcrystalline cellulose) 1 hour prior to the following tests:
countermovement vertical jump (CVJ), forearm flexion repetitions to exhaustion, isometric
maximal voluntary contractions (MVCs) of the leg extensors, and a 50-repetition maximal
concentric isokinetic leg extension endurance test.
Results: There were no differences between the TR and PL trials for CVJ height (P > 0.05),
isometric MVC peak torque (P > 0.05), maximal concentric isokinetic peak torque (P > 0.05),
percent decline during the leg extension endurance tests (P > 0.05), or repetitions to exhaustion
during the forearm flexion endurance tests (P > 0.05).
Conclusion: These findings indicated no improvements in the measured variables as a result of
ingesting this nutritional supplement. Future studies should examine whether chronic
supplementation or a loading period is necessary to observe any ergogenic effects of this
supplement.
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This is the publisher's version, also found at http://www.jissn.com/content/5/1/3
Date
2008
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BioMed Central
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Citation
Herda, Trent J.; et al. (2008) Effects of a supplement designed to increase ATP levels on muscle strength, power output, and endurance. Journal of the International Society of Sports Nutrition, 5.3.