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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 47 (1981), S. 271-279 
    ISSN: 1439-6327
    Keywords: Local rhythmical muscle work ; Rest intervals ; iEMG ; Duration of the R-R interval ; Endurance time ; Recovery time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a model work place (hand-grip dynamometer), eleven subjects performed rhythmical hand-grip contractions to exhaustion (frequency 30/min). In each working cycle the contraction and rest phases were distinguished. The work to exhaustion was repeated four times (four working periods with 15-min rest intervals). The tests were performed at 40, 60, 80, 100% MVC. Analysis of Variance showed no difference in the group means (mean values of each working period and load level) for the duration of the contraction or rest phases, the integrated bioelectrical muscle activity (iEMG) of flexors, extensors, brachioradialis (iEMG referred to working cycle and contraction phase) or iEMG of the thenar muscles (referred to the working cycle), or in the duration of the R-R interval in the ECG during comparable periods of the experiments. The endurance times decreased from working period 1–4, and a similar decrease occurred in the force-time product. It may be concluded from these results that 15 min rest is insufficient for adequate recovery from hand-exhaustion exercise.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 51 (1983), S. 145-154 
    ISSN: 1439-6327
    Keywords: Local dynamic muscle work ; Working frequency ; Age ; Sex ; iEMG ; R-R interval
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty untrained subjects (group 1: 10 ♀, 20–30 years; group 2: 10 ♀, 36–46 years; group 3: 10 ♂, 20–30 years) performed dynamic hand work on a hand-grip dynamometer at loads varying from 20 to 100% MVC and three different working frequencies (20, 40, and 60 cpm). The mechanical muscle activity, the iEMG and the R-R interval were measured throughout the exercise. Before and after each exercise, the maximal hand-grip force (MVC) was determined together with the iEMG and the R-R interval. With the loads increasing gradually, the mean values of the duration of the contraction phase and of the iEMG of the four muscles increased in all test groups, but the duration of the rest phase and R-R interval decreased. Through an Analysis of Variance, evidence of systematic differences between the test groups was significant for the R-R interval only, while the effects of the loads (with exception of the rest phase) and of the working frequency proved significant for all parameters. The MVC, the iEMG and the R-R interval measured before and after the exercise did not show significant differences. This indicates that the exercise was not fatiguing.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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