Mechanical properties of dynamic muscle contraction against viscosity resistance(isoviscous contraction). Its comparison with isotonic and isokinetic contraction.
- VernacularTitle:粘性負荷に対する筋運動（等粘性収縮）の力学的特性 等張性および等速性収縮との比較
- Author:
KUNIHIKO ITOH
;
KATSUMI MITA
;
KUMI AKATAKI
;
MAKOTO WATAKABE
;
TOSHIMI SOEDA
;
HISAKO NONAKA
;
ATSUO KATOH
- Publication Type:Journal Article
- Keywords:
Dynamic muscle contraction;
Isotonic contraction;
Isokinetic contraction;
Angular velocity;
Torque
- From:Japanese Journal of Physical Fitness and Sports Medicine
1997;46(2):211-219
- CountryJapan
- Language:Japanese
-
Abstract:
The present study attempted to define a dynamic muscle contraction against viscosity resistance in which force is proportional to velocity of movement, and to determine its mechanical properties in comparison with isotonic and isokinetic muscle contraction. This dynamic contraction was referred to as the “isoviscous contraction” . A loading mechanism consisting of a directly-driven electromagnetic motor and an electronic control circuit was developed to enable three patterns of dynamic contraction to be performed. The torque, joint angle and joint angular velocity in the three types of dynamic contraction were measured in 8 healthy male volunteers during knee joint extension. The isoviscous contraction was not accompanied by any abrupt change in torque during the movement observed regularly in isotonic and isokinetic contraction. The instructed movement for isoviscous contraction could be performed over a wide range of joint motion at all levels of contraction. In addition to its unique mechanical properties, since the viscosity resistance produces a better damping effect against an abrupt change in torque, isoviscous contraction is considered to be a useful method of rehabilitation training in disabled patients and aged individuals. However, the great inertial force produced by isoviscous contraction corresponding to that in isotonic contraction should be further investigated.
