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Enhanced Endurance Performance by Periodization of CHO Intake: "sleep low" strategy

Marquet, LA and Brisswalter, J and Louis, J and Tiollier, E and Burke, L and Hawley, J and Hausswirth, C (2016) Enhanced Endurance Performance by Periodization of CHO Intake: "sleep low" strategy. Medicine and Science in Sports and Exercise, 48 (4). pp. 663-672. ISSN 1530-0315

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Abstract

Purpose: We investigated the effect of a chronic dietary periodization strategy on endurance performance in trained athletes.

Methods: 21 triathletes (V[Combining Dot Above]O2max: 58.7 +/- 5.7 mL[middle dot]min-1[middle dot]kg-1) were divided into 2 groups: a "sleep-low" (SL, n = 11) and a control group (CON, n = 10) consumed the same daily carbohydrate (CHO) intake (6 g[middle dot]kg-1[middle dot]d-1) but with different timing over the day to manipulate CHO availability before and after training sessions. The "sleep low" strategy consisted of a 3-week training/diet intervention comprising three blocks of diet/exercise manipulations: 1) "train-high" interval training sessions (HIT) 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 supra-maximal 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 %PRE, 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 supra-maximal cycling capacity and 10 km running time in trained endurance athletes.

Item Type: Article
Additional Information: This is a non-final version of an article published in final form in Medicine & Science in Sports & Exercise: April 2016 - Volume 48 - Issue 4 - p 663–672
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: American College of Sports Medicine (ACSM)
Date Deposited: 14 Jan 2016 09:12
Last Modified: 22 Aug 2016 10:53
DOI or Identification number: 10.1249/MSS.0000000000000823
URI: http://researchonline.ljmu.ac.uk/id/eprint/2605

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