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Acute consumption of varied doses of cocoa flavanols does not influence exercise-induced muscle damage

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posted on 09.07.2020 by Liam D Corr, Adam Field, Deborah Pufal, Jenny Killey, Tom Clifford, Liam D Harper, Robert J Naughton
Polyphenol consumption has become a popular method of trying to temper muscle damage. Cocoa flavanols (CF) have attracted attention due to their high polyphenol content and palatability. As such, this study will investigate whether an acute dose of CF can aid recovery following exercise-induced muscle damage. The study was a laboratory-based, randomized, single-blind, nutrient-controlled trial involving 23 participants (13 females and 10 males). Participants were randomized into either control ∼0 mg CF (n = 8, four females); high dose of 830 mg CF (CF830, n = 8, five females); or supra dose of 1,245 mg CF (CF1245, n = 7, four females). The exercise-induced muscle damage protocol consisted of five sets of 10 maximal concentric/eccentric hamstring curls and immediately consumed their assigned drink following completion. To measure muscle recovery, maximal voluntary isometric contraction (MVIC) of the knee flexors at 60° and 30°, a visual analog scale (VAS), and lower-extremity function scale were taken at baseline, immediately, 24-, 48-, and 72-hr postexercise-induced muscle damage. There was a main effect for time for all variables (p < .05). However, no significant differences were observed between groups for all measures (p ≥ .17). At 48 hr, there were large effect sizes between control and CF1245 for MVIC60 (p = .17, d = 0.8); MVIC30 (p = .26, d = 0.8); MVIC30 percentage change (p = .24 d = 0.9); and visual analog scale (p = .25, d = 0.9). As no significant differences were observed following the consumption of CF, there is reason to believe that CF offer no benefit for muscle recovery when ingested acutely.

History

School

  • Sport, Exercise and Health Sciences

Published in

International Journal of Sport Nutrition and Exercise Metabolism

Volume

30

Issue

5

Pages

338 - 344

Publisher

Human Kinetics

Version

AM (Accepted Manuscript)

Rights holder

© Human Kinetics, Inc.

Publisher statement

Accepted author manuscript version reprinted, by permission, from International Journal of Sport Nutrition and Exercise Metabolism, 2020, 30 (5), 338-344, https://doi.org/10.1123/ijsnem.2020-0057. © Human Kinetics, Inc.

Publication date

2020-09-01

Copyright date

2020

ISSN

1526-484X

eISSN

1543-2742

Language

en

Depositor

Dr Tom Clifford. Deposit date: 8 July 2020

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