Impact of Nutritional Supplementation on Aerobic Performance and Fatigue

Compare an over-the-counter dietary supplement (NutraStem Active®) and placebo over a 30-day intervention on aerobic exercise performance and fatigue. The hypothesis is that supplementation with NutraStem Active® improve aerobic performance and reduce subjective measures of fatigue.

Compare an over-the-counter dietary supplement (NutraStem Active®) and placebo over a 30-day intervention on aerobic exercise performance and fatigue. The hypothesis is that supplementation with NutraStem Active® improve aerobic performance and reduce subjective measures of fatigue. The basic protocol includes baseline assessment of fitness and participation in a vigorous session of exercise immediately before and 30 days after consumption of the experimental supplement or placebo. The exercise task is intended to be fatiguing and demanding but is not expected to create failure. The supplement makes claims related to boosting exercise performance and reducing fatigue. The study design will determine if these outcomes are in fact present in a group of healthy, young, and active adults. The primary dependent measures are perceived exertion during exercise and levels of fatigue measured on multiple non-exercise days.

Ratings of perceived exertion (RPE) as measured on a self-report scale. The scale is a single-item measure ranging from 0 (no exertion) to 10 (max exertion).

Ratings of perceived fatigue as measured on a self-report scale. The scale is a single-item measure ranging from 1 (not at all) to 5 (extremely).

Ratings of perceived energy as measured on a self-report scale. The scale is a single-item measure ranging from 1 (not at all) to 5 (extremely).

Inclusion Criteria: healthy physically active non-smoker Exclusion Criteria: known cardiovascular, pulmonary, or metabolic disease body mass index greater than 35