תזונה ותוספים Caffeine enhances upper body strength in resistance-trained women

[Mike Bikov]

Erica R Goldstein email, Patrick L Jacobs email, Michael Whitehurst email, Tina Penhollow email and Jose Antonio email

Journal of the International Society of Sports Nutrition 2010, 7:18doi:10.1186/1550-2783-7-18
Published: 14 May 2010
Abstract (provisional)

Background

Research has indicated that low-to-moderate dosages of caffeine supplementation are ergogenic for sustained endurance efforts as well as high-intensity exercise. The effects of caffeine supplementation on strength-power performance are equivocal, with some studies indicating a benefit and others demonstrating no change in performance. The majority of research that has examined the effects of caffeine supplementation on strength-power performance has been carried out in both trained and untrained men. Therefore, the purpose of this study was to determine the acute effects of caffeine supplementation on strength and muscular endurance in resistance-trained women.

Methods

In a randomized manner, 15 women consumed caffeine (6 mg/kg) or placebo (PL) seven days apart. Sixty min following supplementation, participants performed a one-repetition maximum (1RM) barbell bench press test and repetitions to failure (RF) at 60% of 1RM. Heart rate (HR) and blood pressure (BP) were assessed at rest, 60 minutes post-consumption, and immediately following completion of repetitions to failure.

Results

Repeated measures ANOVA indicated a significantly greater bench press maximum with caffeine (p[less than or equal to]0.05) (52.9 +/- 11.1 kg vs. 52.1 +/- 11.7 kg) with no significant differences between conditions in 60% 1RM repetitions (p=0.81). Systolic blood pressure was significantly greater post-exercise, with caffeine (p<0.05) (116.8 +/- 5.3 mmHg vs. 112.9 +/- 4.9 mmHg).

Conclusions

These findings indicate a moderate dose of caffeine may be sufficient for enhancing strength performance in resistance-trained women.

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