Low-intensity eccentric contractions of the knee extensors and flexors protect against muscle damage

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme
Min-Ju LinKazunori Nosaka

Abstract

This study investigated the magnitude and duration of the protective effect of low-intensity eccentric contractions (LowEC) against damage induced by maximal eccentric contractions (MaxEC) of the knee flexors (KF) and extensors (KE). Young men were assigned to 8 experimental groups and 2 control groups (n = 13/group); the experimental groups performed LowEC of KF or KE 2 days (2d), 1 week (1wk), 2 weeks (2wk), or 3 weeks (3wk) before MaxEC, while the control groups performed MaxEC of KF or KE without LowEC. The 2d, 1wk, 2wk, and 3wk groups performed 30 LowEC of KF or 60 LowEC of KE with a load of 10% of maximal voluntary isometric contraction strength on a resistance-training machine, and all groups performed 30 MaxEC of KF or 60 MaxEC of KE on an isokinetic dynamometer. Several muscle damage markers were measured from before to 2 days after exercise (LowEC) or from before to 5 days after exercise (MaxEC). No significant changes in any variables were evident after LowEC. The changes in all variables after MaxEC were smaller (P < 0.05) for the 2d and 1wk groups (e.g., peak creatine kinase activity: 1002 ± 501 IU/L; peak muscle soreness: 13 ± 5 mm) than for the control group (peak creatine kinase activity: 3005 ± 983 IU/L; peak m...Continue Reading

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Citations

Mar 2, 2016·Muscle & Nerve·Kellie E BoychukJonathan P Farthing
May 18, 2016·Medicine and Science in Sports and Exercise·Trevor C ChenKazunori Nosaka
Oct 27, 2016·Exercise and Sport Sciences Reviews·Robert D HyldahlKazunori Nosaka
May 10, 2017·PM & R : the Journal of Injury, Function, and Rehabilitation·Jaime Salom-MorenoCésar Fernández-de-Las-Peñas
Oct 28, 2017·Medicine and Science in Sports and Exercise·Trevor C ChenKazunori Nosaka
Sep 12, 2018·International Journal of Sports Physiology and Performance·Eduardo Lusa CadoreMikel Izquierdo
Jan 22, 2019·Scandinavian Journal of Medicine & Science in Sports·Trevor C ChenKazunori Nosaka
Dec 31, 2016·Journal of Applied Physiology·Jonathan M PeakeKazunori Nosaka
Oct 31, 2017·Journal of Strength and Conditioning Research·Che-Hsiu ChenWei-Chin Tseng
Feb 20, 2019·European Journal of Applied Physiology·Min-Jyue HuangTrevor C Chen
Mar 6, 2021·Journal of Strength and Conditioning Research·Justin J Merrigan, Margaret T Jones
Feb 10, 2021·Medicine and Science in Sports and Exercise·Trevor C ChenKazunori Nosaka

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