Vitamin C consumption does not impair training-induced improvements in exercise performance

Roberts, Llion A., Beattie, Kris, Close, Graeme L. and Morton, James P. (2011) Vitamin C consumption does not impair training-induced improvements in exercise performance. International Journal of Sports Physiology and Performance, 6 1: 58-69.

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Name Description MIMEType Size Downloads
Author Roberts, Llion A.
Beattie, Kris
Close, Graeme L.
Morton, James P.
Title Vitamin C consumption does not impair training-induced improvements in exercise performance
Journal name International Journal of Sports Physiology and Performance   Check publisher's open access policy
ISSN 1555-0265
1555-0273
Publication date 2011-03
Sub-type Article (original research)
Volume 6
Issue 1
Start page 58
End page 69
Total pages 22
Place of publication Champaign, IL, United States
Publisher Human Kinetics
Collection year 2012
Language eng
Formatted abstract Purpose:
To test the hypothesis that antioxidants can attenuate high-intensity interval training-induced improvements in exercise performance.

Methods:

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 posttraining, subjects were assessed for VO 2max, 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 pretraining VO 2max 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.

Conclusions:

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.
Keyword Antioxidants
High-intensity interval exercise
Training adaptation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Human Movement Studies Publications
 
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Created: Sat, 09 Jun 2012, 07:48:17 EST by Llion Roberts on behalf of School of Human Movement Studies