Submaximal-exercise-induced impairment of human muscle to develop and maintain force at low frequencies of electrical stimulation

Research output: Contribution to journalArticle

Bibtex

@article{1127d8f15ae44545b9b385e9194c252a,
title = "Submaximal-exercise-induced impairment of human muscle to develop and maintain force at low frequencies of electrical stimulation",
abstract = "The aim of this study was to test the hypothesis that low intensity exercise-induced low frequency fatigue is caused by failure of excitation-contraction coupling. Changes in knee extension torque at 5, 10, 15, 20 and 50 Hz electrical stimulation of quadriceps muscle in ten healthy, young, male subjects were recorded during 20-min voluntary exercise followed by 60-min recovery. In seven of the ten subjects, changes in torque during 3 min of 10-Hz stimulation were recorded 2 min and 20 min after 20 min voluntary exercise. Exercise was performed at 30% of maximal voluntary contraction with a contraction plus relaxation period of 6 plus 4 s. Torque at 5, 10, 15, 20 and 50-Hz stimulation at the end of exercise was reduced to mean 91.0 (SEM 5.4)%, 68.7 (SEM 5.4)%, 67.2 (SEM 3.9)%, 66.5 (SEM 4.5)% and 74.7 (SEM 4.3)% of control values, respectively. During the first 30 s of the 3 min 10-Hz stimulation, torque was reduced in exercised muscle and increased in nonfatigued muscle. The reduction in torque was more marked 20 min after exercise than after 2 min. In conclusion, the pattern of depression and recovery of muscle force observed was in agreement with the hypothesis that the main cause of low intensity exercise-induced low frequency fatigue is an impairment of excitation-contraction coupling.",
keywords = "Electrical stimulation, Fatigue Muscle contraction, Muscles",
author = "A Ratkevicius and A Skurvydas and Jan Lexell",
year = "1995",
doi = "10.1007/BF00865025",
language = "English",
volume = "70",
pages = "294--300",
journal = "European Journal of Applied Physiology",
issn = "0365-0863",
publisher = "Springer",
number = "4",

}