Loading...
A2 milk enhances dynamic muscle function following repeated sprint exercise, a possible ergogenic aid for a1-protein intolerant athletes?
Kirk, Ben Mitchell, Jade Jackson, Matthew Alizadehkhaiyat, Omid Clifford, Tom
Kirk, Ben
Mitchell, Jade
Jackson, Matthew
Alizadehkhaiyat, Omid
Clifford, Tom
Editors
Other contributors
Affiliation
Epub Date
Issue Date
2017-01-28
Submitted date
Alternative
Abstract
Hyperaminoacidemia following ingestion of cows-milk may stimulate muscle anabolism and attenuate exercise-induced muscle damage (EIMD). However, as dairy-intolerant athletes do not obtain the reported benefits from milk-based products, A2 milk may offer a suitable alternative as it lacks the A1-protein. This study aimed to determine the effect of A2 milk on recovery from a sports-specific muscle damage model. Twenty-one male team sport players were allocated to three independent groups: A2 milk (n = 7), regular milk (n = 7), and placebo (PLA) (n = 7). Immediately following muscle-damaging exercise, participants consumed either A2 milk, regular milk or PLA (500 mL each). Visual analogue scale (muscle soreness), maximal voluntary isometric contraction (MVIC), countermovement jump (CMJ) and 20-m sprint were measured prior to and 24, 48, and 72 h post EIMD. At 48 h post-EIMD, CMJ and 20-m sprint recovered quicker in A2 (33.4 ± 6.6 and 3.3 ± 0.1, respectively) and regular milk (33.1 ± 7.1 and 3.3 ± 0.3, respectively) vs. PLA (29.2 ± 3.6 and 3.6 ± 0.3, respectively) (p < 0.05). Relative to baseline, decrements in 48 h CMJ and 20-m sprint were minimised in A2 (by 7.2 and 5.1%, respectively) and regular milk (by 6.3 and 5.2%, respectively) vs. PLA. There was a trend for milk treatments to attenuate decrements in MVIC, however statistical significance was not reached (p = 0.069). Milk treatments had no apparent effect on muscle soreness (p = 0.152). Following muscle-damaging exercise, ingestion of 500 mL of A2 or regular milk can limit decrements in dynamic muscle function in male athletes, thus hastening recovery and improving subsequent performance. The findings propose A2 milk as an ergogenic aid following EIMD, and may offer an alternative to athletes intolerant to the A1 protein.
Citation
Kirk B, Mitchell J, Jackson M, Amirabdollahian F, Alizadehkhaiyat O, Clifford T. (2017) A2 Milk Enhances Dynamic Muscle Function Following Repeated Sprint Exercise, a Possible Ergogenic Aid for A1-Protein Intolerant Athletes? Nutrients, 9(2):94. https://doi.org/10.3390/nu9020094
Publisher
Journal
Research Unit
PubMed ID
28134840 (pubmed)
PubMed Central ID
Embedded videos
Additional Links
Type
Journal article
Language
en
Description
© 2019 The Authors. Published by MDPI. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.3390/nu9020094
Series/Report no.
ISSN
2072-6643
EISSN
2072-6643
ISBN
ISMN
Gov't Doc #
Sponsors
Rights
Licence for published version: Creative Commons Attribution 4.0 International