Mechanomyography and electromyography during and after fatiguing shoulder eccentric contractions in males and females
- 19 April 2006
- journal article
- Published by Wiley in Scandinavian Journal of Medicine & Science in Sports
- Vol. 17 (2), 172-179
- https://doi.org/10.1111/j.1600-0838.2006.00551.x
Abstract
The aim of this study was to investigate changes in mechanomyographic (MMG) and the surface electromyographic (EMG) signals during and after fatiguing shoulder eccentric contractions in a group consisting of 12 males and 12 females. Exerted force, MMG, EMG, pain and rate of perceived exertion were assessed before, during and after repeated high-intensity eccentric exercises. Bouts of eccentric contractions caused a decrease in the exerted force for males (P<0.05) and an increase in the rate of perceived exertion and pain for both genders (P<0.05). During eccentric exercise, the root mean square (RMS) values of the MMG signal increased (P<0.05). The mean power frequency (MPF) values of the EMG signal decreased at the end of each eccentric bout for both genders (P<0.05); the decrease was higher for females compared with males (P<0.05). Immediately after eccentric exercise in static abduction of the upper limbs, the MMG RMS and MPF values increased (P<0.05). The present study showed that (1) neuromuscular changes associated with pain and changes in muscle stiffness and (2) changes in motor units strategy during fatigue development in shoulder muscle are reflected in the MMG and EMG signals.Keywords
This publication has 35 references indexed in Scilit:
- Experimental muscle pain increases mechanomyographic signal activity during sub-maximal isometric contractionsJournal of Electromyography and Kinesiology, 2005
- Gender, muscle, and velocity comparisons of mechanomyographic and electromyographic responses during isokinetic muscle actionsScandinavian Journal of Medicine & Science in Sports, 2004
- Exercise-Induced Muscle Damage in HumansAmerican Journal of Physical Medicine & Rehabilitation, 2002
- Effect of moderate dehydration on torque, electromyography, and mechanomyographyMuscle & Nerve, 2002
- Slower fatigue and faster recovery of the adductor pollicis muscle in women matched for strength with menActa Physiologica Scandinavica, 1999
- Neuromuscular Fatigue and Recovery in Male and Female Athletes during Heavy Resistance ExerciseInternational Journal of Sports Medicine, 1993
- Acoustic and surface EMG diagnosis of pediatric muscle diseaseMuscle & Nerve, 1990
- Exercise-Induced Muscle Damage and AdaptationSports Medicine, 1989
- Performance and Muscle Metabolite Changes in Exercise with Repeated Maximal Dynamic ContractionsInternational Journal of Sports Medicine, 1981
- A Study of Painful Shoulder in WeldersActa Orthopaedica, 1976