The relationship between the dynamic and static function of abdominal muscles.

Thirty-eight field force soldiers were studied to investigate the influence of training with repetitive dynamic curl-ups on the static holding capacity of abdominals for lumbopelvic control when load was progressively applied via lower limb movements. Results indicated that when high numbers of curl-ups (>51) were able to be performed continuously, the static capacity of the abdominals was higher (p <0.01). However, the ability to statically hold was found to be even more dependent on the speed at which the curl-up was performed (p <0.0001). Those regularly performing the curl-up at a rapid rate demonstrated decreased static abdominal function. The results suggest that when training the abdominals for a stability function, curl-up exercises should be performed at a slow controlled rate.