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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Enhanced endurance performance by periodization of carbohydrate intake: "Sleep Low" strategy
Medicine and Science in Sports and Exercise, Volume 48, No. 4, Year 2016
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Description
Purpose We investigated the effect of a chronic dietary periodization strategy on endurance performance in trained athletes. Methods Twenty-one triathletes (VO2max: 58.7 ± 5.7 mL·min-1·kg-1) were divided into two groups: a "sleep-low" (SL) (n = 11) and a control (CON) group (n = 10) consumed the same daily carbohydrate (CHO) intake (6 g·kg-1·d-1) but with different timing over the day to manipulate CHO availability before and after training sessions. The SL strategy consisted of a 3-wk training-diet intervention comprising three blocks of diet-exercise manipulations: 1) "train-high" interval training sessions in the evening with high-CHO availability, 2) overnight CHO restriction ("sleeping-low"), and 3) "train-low" sessions with low endogenous and exogenous CHO availability. The CON group followed the same training program but with high CHO availability throughout training sessions (no CHO restriction overnight, training sessions with exogenous CHO provision). Results There was a significant improvement in delta efficiency during submaximal cycling for SL versus CON (CON, +1.4% ± 9.3%; SL, +11% ± 15%, P < 0.05). SL also improved supramaximal cycling to exhaustion at 150% of peak aerobic power (CON, +1.63% ± 12.4%; SL, +12.5% ± 19.0%; P = 0.06) and 10-km running performance (CON, -0.10% ± 2.03%; SL, -2.9% ± 2.15%; P < 0.05). Fat mass was decreased in SL (CON, -2.6 ± 7.4; SL, -8.5% ± 7.4% before; P < 0.01), but not lean mass (CON, -0.22 ± 1.0; SL, -0.16% ± 1.7% PRE). Conclusion Short-term periodization of dietary CHO availability around selected training sessions promoted significant improvements in submaximal cycling economy, as well as supramaximal cycling capacity and 10-km running time in trained endurance athletes. © 2016 by the American College of Sports Medicine.
Authors & Co-Authors
Brisswalter, Jeanick
France, Paris
Insep Institut National Des Sports et Deducation Physique
France, Nice
Laboratoire Motricité Humaine Expertise Sport Santé
Burke, Louise M.
Australia, Canberra
Australian Institute of Sport
Australia, Sydney
Australian Catholic University
Hawley, John A.
Australia, Sydney
Australian Catholic University
United Kingdom, Liverpool
Liverpool John Moores University
Statistics
Citations: 104
Authors: 3
Affiliations: 5
Identifiers
Doi:
10.1249/MSS.0000000000000823
ISSN:
01959131
Research Areas
Health System And Policy
Study Design
Randomised Control Trial