Transient development of tension at voluntary muscle relaxation in human arm muscles.
- VernacularTitle:筋弛緩動作の遅速とその要因について ＩＩ 一過性の張力発揮とその関連
- Author:
KUNIATSU NAGAMI
- Publication Type:Journal Article
- Keywords:
Muscle relaxation;
Electromyogram;
Transient tension development;
Brachial biceps muscle
- From:Japanese Journal of Physical Fitness and Sports Medicine
1987;36(3):128-137
- CountryJapan
- Language:Japanese
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Abstract:
I have reported that tension development of sustained tension transiently occur at volutnary muscle relaxation. I attempted to clarify relation of the transient tension development and velocity of muscle relaxation in brachial biceps muscle. Obtained results were as follows:
1) The tension followed with muscle relaxation was diphasic. Frequency of the diphasic tension increased depending on the sustained tension level before relaxation.
2) Amount and duration of the transient tension development were below 3% of the tensions and 80 ms, respectively.
3) There was significant relation between amount of the tension develovment and velocity of the muscle relaxation at the sustained tension of 15 (p<0.05) and 20%MVC (p<0.01) .
4) Girth of upper arm detected by using the rubber-strain-gauge method increased at the transient tension development.
From these results, it is suggested that the tension development is related to transient elevation of the central nervous activity and the muscle shortening during the transient tension development accelerated muscle relaxation by decrease of the spindle discharges in muscle.
