RELATIONSHIP AMONG MUSCLE STRENGTH OF LOWER LIMBS, KINEMATICS AND KINETICS DURING TAKE OFF IN THE LONG JUMP-FOCUS ON THE KNEE JOINT AND THE HIP JOINT-
- VernacularTitle:走幅跳競技者の下肢筋力と踏切中のキネマティクス及びキネティクスの関係‐膝関節と股関節に着目して‐
- Author:
MITSURU SHIGA
;
MITSUGI OGATA
- Publication Type:Journal Article
- Keywords:
long jump;
take-off phase;
motion;
joint torque;
strength of lower limbs
- From:Japanese Journal of Physical Fitness and Sports Medicine
2004;53(1):157-166
- CountryJapan
- Language:Japanese
-
Abstract:
The purpose of this study was to investigate the relationship among torque, motion of lower limbs during the take-off phase and muscle strength of lower limbs. Subjects were 12 male track and field athletes who had a top record of 6.84±0.41 m. Several variables of the 12 subjects, such as displacement, velocity, angle and angular velocity, and maximum torque of the knee and hip joints during the take-off phase, were obtained from film analysis and measurement of lower limb strength by Biodex.
The main results were as follows:
1. Subjects who had a lower angular velocity of the take-off knee joint after landing showed a lower decreasing ratio of velocity during the takeoff phase.
2. There was a significant relationship between records for the long jump and hip flexion torque of the take-off leg during the last part of the take-off phase (r=-0.678, P<0.05) .
3. Subjects who showed a higher value of hip flexion torque of their free leg during the last part of the take-off phase showed lower take-off angles.
4. There was a significant relationship between knee extension strengths (60, 180, 300 deg/s) and knee joint angles at the middle of the take-off phase (r=0.700 P<0.01, r=0.672 P<0.05, r=0.751 P<0.01) .
5. Subjects who maintained a larger knee angle for their take-off leg indicated a decrease in knee extension torque of their take-off leg during the last part of the take-off phase.
6. Subjects who showed higher hip extension strength made the transition to hip flexion torque of the take-off leg from the middle to the last part of the take-off phase.
From these results, it can be seen that knee extension strength is important for efficient take-off, and hip joint torque is one of the factors that influences one's record in the long jump.
