2001 Volume 13 Issue 1 Pages 53-57
A method for determining a ten-repetition-maximum (10 RM) for the gluteus medius muscle (GM) was developed with the participation of 14 healthy college students. First, a one-repetition-maximum (1 RM) was obtained with the participants in a sidelying position. Specifically, this was achieved by a tensiometer reading taken when the participant performed maximum isometric contraction of GM with the hip in 0°, 15°, and 30° of abduction. Next, determination of 10 RM was carried out by having the participant perform an isotonic GM contraction with two thirds of the 1 RM. The load was either decreased or increased depending on whether or not the participant was capable of carrying out this manoeuvre 10 times. The results showed that correlation coefficients were largest for 0° of hip abduction in comparison to those for 15° and 30° of hip abduction. For all the participants with the hip in 0° of abduction the mean proportion of the load for 10 RM to that for 1 RM was 45.9%. Also this position of 0° abduction showed the smallest dispersion of the three angles in hip abduction. It was concluded from this study that, for progressive resistance exercise for GM, 40 to 45% of 1 RM obtained in 0° of hip abduction can be used for calculation of 10 RM.