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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Demura S. 1, Aoki H. 1, Kawabata H. 1, Nagasawa Y. 2
1 Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan;
2 Kyoto Pharmaceutical University, Kyoto, Japan
Aim. This study aimed to compare decrease characteristics of intermittent muscle power exertion in hand grip and elbow flexion movements.
Methods. The subjects were 15 healthy young males (mean age 23.3±3.1 yr, mean height 171.8±5.2 cm, mean mass 65.9±5.8 kg). All subjects were right-handed. The subjects performed intermittent muscle power exertion through hand grip and elbow flexion movements (30 times x min.[-1]) using 50% maximal voluntary contraction (MVC). Both the peak power and power were calculated. Mean peak power and power quantity (one to five times [initial power]), and (26 to 30 times [final power]), total peak power and total power quantity of 30 times were selected as evaluation parameters.
Results. The peak power decreased significantly in both movements, but the initial and final peak powers showed insignificant differences between both movements. The power quantity decreased significantly only in the elbow flexion movement, and the initial and final powers were significantly smaller in the hand grip movement. The total power quantity was significantly smaller in the elbow flexion movement, but the total peak power showed an insignificant difference between both movements. A significant and high relationship was found between total peak power and total power quantity in both movements.
Conclusion. In conclusion, when intermittently exerting muscle power using 50% MVC, a decrease of mean power is smaller for the hand grip movement than for the elbow flexion movement. To draw a similar mean power decrease to the elbow flexion movement, loads greater than 50% MVC may be required in the hand grip movement.