We measured isokinetic muscle strength of shoulder, elbow, hip-joint, knee and trunk at varying speed in 4 males Kendo players, using a Cybex II isokinetic dynamometers and a Trunk Extension Flexion Unit. We investigated longitudinal changes of skeletal muscle strength by 4 years kendo training. The following results were obtained:
(1) For subjects in their second year, body weight and maximal girth of leg increased to that percent body fat decreased.
(2) Isokinetic muscle strength on upper limb and lower limb had development until second years.
(3) Training in kendo had increasing tendency isokinetic muscle strength under these conditions, shoulder adduction, shoulder internal and external rotation in right hand, hip-joint extension and flexion in both leg, hip-joint adduction in right leg.
(4) Isokinetic muscle strength for trunk extension had an increasing tendency every year. In the case of trunk flexion, there was not change exerted at lower contraction speed but at higher.
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