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Purpose] We measured changes of indices of muscle architecture of the lateral head of the gastrocnemius in graded ankle plantar contraction, and examined the reliability of the measurement indices as well as the relationships of the changes of the respective muscle architecture indices with graded ankle plantar isometric contraction. [Subjects and Method] The subjects were 10 healthy males. We measured muscle thickness, pennation angle, superficial aponeurosis displacement, and deep aponeurosisdoi:10.1589/rika.23.699 fatcat:wsyiqinqd5b4pkxlhzpc5kws24