PMID: 11323549Apr 27, 2001Paper

Human hamstring muscles adapt to eccentric exercise by changing optimum length

Medicine and Science in Sports and Exercise
Camilla L BrockettUwe Proske

Abstract

It is now established that unaccustomed eccentric exercise leads to muscle fiber damage and to delayed-onset muscle soreness (DOMS) in the days after exercise. However, a second bout of eccentric exercise, a week after the first, produces much less damage and soreness. The purpose of this study was to provide evidence from muscle mechanical properties of a proposed mechanism for this training effect in human hamstring muscles. The eccentric exercise involved 12 sets of 6 repetition "hamstring lowers," performed on specially designed equipment. Hamstring angle-torque curves were constructed for each of 10 subjects (8 male and 2 female) while they performed maximum voluntary knee extension and flexion movements on an isokinetic dynamometer. Testing sessions were performed over the week before eccentric exercise, immediately post exercise, and daily, up to 8 d post exercise. Subject soreness ratings and leg girth measurements were also made post exercise. Six subjects performed a second bout of eccentric exercise, 8 d after the first, and measurements were continued up to 10 d beyond that. There was a significant shift in the optimum angle for torque generation (Lo), to longer muscle lengths immediately post exercise (7.7 degrees ...Continue Reading

Citations

Jun 5, 2001·The Journal of Physiology·N P WhiteheadU Proske
Apr 13, 2004·Medicine and Science in Sports and Exercise·Camilla L BrockettUwe Proske
Jan 7, 2006·Journal of Applied Physiology·Timothy A Butterfield, Walter Herzog
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Mar 16, 2007·Scandinavian Journal of Medicine & Science in Sports·A ArnasonR Bahr
Dec 21, 2006·Somatosensory & Motor Research·Helle AndersenThomas Graven-Nielsen
Dec 20, 2007·Medicine and Science in Sports and Exercise·Nele Nathalie MahieuErik Witvrouw
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Apr 2, 2008·Medicine and Science in Sports and Exercise·Malachy P McHugh, Marcus Nesse
Feb 2, 2010·The Journal of Orthopaedic and Sports Physical Therapy·Bryan C HeiderscheitDarryl G Thelen
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Aug 7, 2010·Medicine and Science in Sports and Exercise·Che-Hsiu ChenTrevor C Chen
May 26, 2011·European Journal of Applied Physiology·Hsin-Lian ChenTrevor C Chen
Aug 10, 2011·The American Journal of Sports Medicine·Jesper PetersenPer Hölmich
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