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Influence of Skeletal Muscle Carnosine Content on Fatigue during Repeated Resistance Exercise in Recreationally Active Women

Authors :
Nicholas A. Coker
Virgil L. Dawson
Sarah J. Dodd
Leonardo P. Oliveira
Jay R. Hoffman
Alyssa N. Varanoske
Ran Wang
Jeffrey R. Stout
Kayla M. Baker
David D. Church
David H. Fukuda
Source :
Nutrients, Vol 9, Iss 9, p 988 (2017), Nutrients, Nutrients; Volume 9; Issue 9; Pages: 988
Publication Year :
2017
Publisher :
MDPI AG, 2017.

Abstract

Carnosine is a naturally occurring intramuscular dipeptide that is thought to attenuate fatigue during high-intensity exercise. Carnosine content is influenced by various factors, including gender and diet. Despite research reporting that carnosine content is lower in women compared to men and lower in vegetarians compared to omnivores, no investigations have examined carnosine content in women based on dietary protein intake and its effect on muscle fatigue. Twenty recreationally active women were assigned to either a high (HI; n = 5), moderate (MOD; n = 10), or low (LO; n = 5) group based upon intramuscular carnosine content of the vastus lateralis. Each participant underwent two unilateral maximal voluntary isometric contractions (MVIC) of the knee extensors separated by an isokinetic exercise protocol consisting of five sets of 50 repeated maximal unilateral contractions. Magnitude-based inferences were used to analyze group differences. Percent decline in rate of force development and peak torque (PT) during the MVICs and changes in PT and mean torque during the muscle-fatiguing protocol were lower in HI compared to both MOD and LO. Additionally, absolute and relative dietary protein intake were greater in HI compared to MOD or LO. Results indicated that greater intramuscular carnosine content was reflective of greater dietary protein intake and that individuals with higher carnosine content displayed a greater attenuation of fatigue compared to those with lower carnosine.

Details

ISSN :
20726643
Volume :
9
Database :
OpenAIRE
Journal :
Nutrients
Accession number :
edsair.doi.dedup.....e5fe0f1f6b3e26313f0bae629f78eb88
Full Text :
https://doi.org/10.3390/nu9090988