Abstract
[Purpose] In this study, we examined changes of electromyogram activity in hip muscles under different load conditions and angles of hip abduction during hip abduct isometric shrinkage movement. [Subjects] The subjects were twelve healthy adults with a mean age of 21.2 years. [Methods] The subjects performed isometric shrinkage movement for hip abduction with different load conditions (0%, 2%, 4%, and 6% of body weight) and different angles of hip abduction (0°, 10°, 20°). Electromyography (EMG) of the gluteus medius, gluteus maximus, tensor fasciae latae were measured in the motor task. [Results] EMG of the gluteus medius increased from quantity of load of 4% and abduct angle 20°. EMG of tensor fasciae latae increased from quantity of load of 2% and abduct angle 10°. [Conclusion] These findings suggest that not only load condition but also angles of hip abduction are important.
