ランプ状短縮・伸長による骨格筋の強縮張力-筋長関係の変化

概要

論文の詳細を見る
It is important to study the dynamic properties of a muscle both for understanding the motor control of limbs and for simulation experiments using a muscle model. However, the properties have unclear points in the case when significantshortening displacement is applied to the muscle or muscle length is longer than its natural length Lo (descending limb of tension-length relation). Thus, the purpose of this study was to make clear the muscle's dynamic properties on a descending limb by methodically measuring tension response of frog semitendinosus muscles to forced shortening. By measuring isometric tetanus tension at various values of muscle length, the relation between tension and muscle length was derived. We measured tension response on a descending limb after shortening the muscle using various displacements and velocities. The obtained results were as follows: When the amount of shortening was between 1 mm to 5 mm, the final tension value after shortening Pe (please enter definition of Pe) was smaller than the isometric tension of muscle length after shortening but larger than the isometric tension before shortening. Pe also increased in proportion to the amount of shortening of the muscle and decreased when the amount was over a certain value. In addition, the muscle length at which maximum Pe occurred was longer than L0. Furthermore, when shortened to 3 mm, Pe increased according to the increase of shortening velocity. This study showed that Pe, after stretching or shortening, depended on both the initial and final length of the muscle under the condition that an electric stimulus was constantly provided to the muscle. That is, in constructing a muscle model that deals with large displacements, it is necessary to represent muscle tension as a function of the past state of muscle.
社団法人日本生体医工学会の論文
2003-12-10

ランプ状短縮・伸長による骨格筋の強縮張力-筋長関係の変化

スポンサーリンク

概要

著者

関連論文

スポンサーリンク