|
|
|
|
( Choe Myung-Ae ) - Seoul National University
|
|
Abstract
|
|
|
|
|
As the crippled persons work mostly in a sitting position and would be engaged in a foot-pressing job, it is necessary to assess their degree of participation of important muscles in various modes of foot activities. In his regard, it seems to be urgent to establish the reference standards for healthy persons.
The present study has been undertaken to determine the degree of participation of the M. tibialis anterior, M. gastrocnemius and M. soleus in heel pressing, flat foot pressing and fore foot pressing motion under varying forces, and in order to compare the electrical activities of three muscles with each other, and to analyze the time sequence between force and appearance or disappearance of EMG recording.
Sixty-three healthy young women ranging from age of 18 to 21". were examined.
The results obtained were as follows:
1. Participation of three muscles in foot movement under varying forces:
A) Both gastrocnemius or left soleus muscle did not contribute to heel pressing motion. Activity of both tibialis anterior muscles was the greatest among three muscles at heel pressing motion and the degree of their activities was proportional to force.
B) Activities of left tibialis anterior muscle and both gastrocnemius muscles were negligible under 3kg force at flat foot pressing movement.
Left gastrocnemius muscle did not contribute to flat foot pressing under 6 or 9kg force. Although activities of both soleus muscles and both tibialis anterior muscles were small, the
Relationship Between Activities of Foot
and EMG of Several Lower Leg
Muscles in Young Women
Choe, Myoung Ae Ph.D., Seoul National
University, 1984
f
com-
diffe. 05 not
The ;roup :ores. ower ever, at at
The ;roup ) mg ;roup ntrol tisti-
The roup specroup i the tally
did
y or oing cant s in
its ioral
degree of their ´activities increased with force at flat foot pressing movement.
Q Activities of both tibialis anterior muscles were negligible under 3kg force at fore foot pressing motion. Activity of both soleus muscles was the greatest among 3 muscles and the degree of their activities increased with force at fore foot pressing motion. Both tibialis anterior muscles participated in fore foot pressing motion with severe exertion.
2. Electrical activities by foot movement under varying forces:
A) Electrical activities were prominent in both tibialis anterior muscles and the level of their activities was linear with force at heel pressing motion. The degree of participation of both soleus muscles was small at heel pressing motion.
B) Electrical activity of tibialis anterior muscle was the greatest among 3 muscles at flat foot pressing movement and was followed by that of soleus muscle. Level of electrical activities increased with force in left soleus muscle and right tibialis a nterior muscle at flat foot pressing movement.´
Q Electrical activity of both soleus muscles was the greatest among 3 muscles at fore foot pressing movement and that of tibialis anterior muscle was next to soleus muscle. Level of electrical activities was proportional to force in left tibial is anterior muscle, right gastrocnemius muscle and both soleus muscles at fore foot pressing movement.
3. Time between starting signal and initiation of contraction of heel pressing and foot pressing motion in 3 muscles was longer than that of flat foot pressing movement. Time of relaxation in 3 muscles was longer than that of contraction under varying forces. EMG recording appeared before initiation of contraction in both tibialis anterior muscles at heel pressing motion and in
both soleus muscles at fore t=oot pressing movement under varying forces. Time of initiation of contraction was similar to 3 movements in both tibialis anterior muscles under varying forces and time of onset of contraction at flat foot pressing motion was the shortest.
4. Fore foot pressing movement would be encouraged in paralysis of tibialis anterior muscle, while heel pressing motion would be encouraged in paralysis of triceps surae muscle.
|
|
|
KeyWords
|
|
|
|
|
원문 및 링크아웃 정보
|
|
|
|
|
|
등재저널 정보
|
|
|
|
|
|
|
|