Research: ROBERTS and COLLEAGUES,

Listed in Issue 208

Abstract

ROBERTS and COLLEAGUES, Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom tested the hypothesis that antioxidants can attenuate high-intensity interval training-induced improvements in exercise performance.

Background

Methodology

Two groups of recreationally active males performed a high-intensity interval running protocol, four times per week for 4 wk. Group 1 (n = 8) consumed 1 g of vitamin C daily throughout the training period, whereas Group 2 (n = 7) consumed a visually identical placebo. Pre- and post-training, subjects were assessed for VO2max, 10 km time trial, running economy at 12 km/h and distance run on the YoYo intermittent recovery tests level 1 and 2 (YoYoIRT1/2). Subjects also performed a 60 min run before and after training at a running velocity of 65% of pre-training VO2max so as to assess training-induced changes in substrate oxidation rates.

Results

Training improved (P < .0005) VO2max, 10 km time trial, running economy, YoYoIRT1 and YoYoIRT2 in both groups, although there was no difference (P = .31, 0.29, 0.24, 0.76 and 0.59) between groups in the magnitude of training-induced improvements in any of the aforementioned parameters. Similarly, training also decreased (P < .0005) mean carbohydrate and increased mean fat oxidation rates during submaximal exercise in both groups, although no differences (P = .98 and 0.94) existed between training conditions.

Conclusion

Daily oral consumption of 1 g of vitamin C during a 4 wk high-intensity interval training period does not impair training-induced improvements in the exercise performance of recreationally active males.

References

Roberts LA, Beattie K, Close GL and Morton JP. Vitamin C consumption does not impair training-induced improvements in exercise performance. Source International journal of sports physiology & performance. 6(1):58-69. Mar 2011.

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