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A Journal on Internal Medicine and Pharmacology

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Gazzetta Medica Italiana Archivio per le Scienze Mediche 2012 December;171(6):713-9

language: English

Differences among competitive sports in force output of various leg muscle contractions

Yamaji S. 1, Demura S. 2

1 Faculty of Medical Sciences, University of Fukui, Fukui, Japan;
2 Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa, Japan


AIM: Muscle strength gained by each athlete’s training will have respective specificity in contraction type and joint angle. This study aimed to compare various leg muscle contractions in competitive swimmers (N.=13), basketball and volleyball players (N.=20), and untrained persons (N.=12).
METHODS: The participants were measured based on iso-inertial (one repetition of maximum half squat (1 RM half SQ), vertical jump, and drop jump), isometric and isokinetic knee extension, and flexion muscle strength (0deg.sec-1, 60 deg.sec-1, 180deg.sec-1). Isokinetic muscle strength in 180 deg.sec-1 was measured by 30 repeated repetitions, and the sum of total work was recorded in addition to peak torque.
RESULTS: Iso-inertial and isometric contraction muscle strength in the basketball/volleyball player group was significantly greater than in the untrained and swimmer groups. On the other hand, all isokinetic strength parameters in swimmers and basketball/volleyball player groups were significantly greater than that in the untrained group, and there were no significant differences between the swimmer and basketball/volleyball player groups.
CONCLUSION: In conclusion, leg muscle exertion properties in swimmers and basketball/volleyball players have specificity reflected in the different basic movements in each of the competitive sports. Basketball/volleyball players are superior in antigravity muscle strength and muscle output by the stretch shortening cycle. Swimmers are not so different from untrained persons in the above strengths, but have superior isokinetic muscle strength.

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