The efficacy of SPORT as a dietary supplement on performance and recovery in trained athletes.
This study investigated the efficacy of SPORT (a popular dietary supplement) in improving performance and assisting recovery in 9 trained athletes. In a double-blind, crossover experiment, subjects ran at workloads of 60 and 80% of peak oxygen uptake (Peak VO2) for 5 min each with 5 min recovery after each bout and at 100% Peak VO2 until exhaustion. Two capsules of either SPORT or a gelatin placebo were administered 1 hr prior to exercise and immediately after each workload. Heart rate (HR) and blood lactate (BLa) were measured at 1 hr prior to exercise, immediately after the 100% exercise bout and at 5, 10, 20, and 45 min during recovery. No significant differences between treatments on HR and BLa measures at any of the 6 time periods, or on subjects' time to exhaustion were found. Under the conditions of this experimental design, SPORT had no beneficial effects on performance or recovery in trained athletes.
Timmons
B W
BW
School of Kinesiology, Lakehead University, Thunder Bay, Ontario P7B.
Newhouse
I J
IJ
Thayer
R E
RE
McAuliffe
J E
JE
McIllwaine
S
S
D000328:Adult; D018592:Cross-Over Studies; D019587:Dietary Supplements; D004144:Diosgenin / Q000009:adverse effects / Q000494:pharmacology*; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010840:Phytosterols / Q000009:adverse effects / Q000494:pharmacology*; D016896:Treatment Outcome
D010840:Phytosterols; C404755:dietary supplement, SPORT; D019344:Lactic Acid; D004144:Diosgenin