Changes of Muscular Relaxation Manner during Growth
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.7 Vol.7】
Manner of muscular relaxation in elbow flexion was observed on the subjects aged from 7 to 22 years old. Relation between surface electromyogram of m. biceps brachii and tension of elbow flexion were used for the parameters form muscular relaxation.
Results were as follows: 1) At elder subjects, silence of surface electromyogram preceded to the tension decrease. But discharge of surface electromyogram preceeded during muscular relaxation at younger subjects. 2) It could be observed the transient tension development before muscular relaxation. The appearance rate of the transient tension development increased as becoming elder.
From above results, it could be considered that the inhibitibility of spinal alpha motoneuron pool did not yet developed for about 7 years old.
DESCENTE SPORTS SCIENCE Vol.7/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Results were as follows: 1) At elder subjects, silence of surface electromyogram preceded to the tension decrease. But discharge of surface electromyogram preceeded during muscular relaxation at younger subjects. 2) It could be observed the transient tension development before muscular relaxation. The appearance rate of the transient tension development increased as becoming elder.
From above results, it could be considered that the inhibitibility of spinal alpha motoneuron pool did not yet developed for about 7 years old.
DESCENTE SPORTS SCIENCE Vol.7/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Shigeru Morimoto*1, Kim Hyun Soo*1, Sho Onodera*2 |
|---|---|
| University or institution | *1 Yokohama National University, *2 The Jikei University School of Medicine |
Keywords
muscular relaxation, surface electromyogram, elbow flexion, transient tension