Influence of posture and training on the endurance time of a low-level isometric contraction
Article Abstract:
Researchers investigated the hypothesis that the critical force of a muscle is less than 10% of its maximum voluntary contraction (MVC). Twelve subjects performed two tests involving isometric contractions of the digit flexors maintained for over an hour at 10% MVC. Their heart rates and EMG remained stable throughout the test and their systolic blood pressures remained stable after increasing steadily by 24 mm HG in the first 28 minutes. These results demonstrate that it is possible to maintain an isometric contraction at 10% MVC for long periods without muscle fatigue and that the critical force of digit flexors is more than 10% MVC.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1997
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Ratings of perceived exertion (RPE) during cycling exercises at constant power output
Article Abstract:
The overall rating of perceived exertion (RPE) and muscular RPE in exercises at constant load were investigated during cycling. The heart rate (HR) corresponding to a given RPE depended on load and duration during constant load exercises. The relation HE = RPE x 10 did not seem to be valid for exercises performed at constant load until exhaustion. Results suggested that RPE is a subjective estimation of the hardness of exercise rather than the intensity of exercise for medium intensity exercise.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1998
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The influence of different floor stiffness on mechanical efficiency of log extensor muscle
Article Abstract:
Internal factors and external conditions that affect muscular work economy were investigated. The mechanical efficiency of positive work in a rebound jump exercise performed in two separate floor surfaces with different compliance was determined. The re-use of elastic energy was observed to significantly affect muscular work efficiency. Floor stiffness was found to influence the mechanical behavior of leg extensor muscles.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1997
User Contributions:
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