| Popis: |
The purpose of this study was to determine the efficacy of implementing two Postural Restoration exercises and relating principles on deadlifts using a hexagonal barbell. Specifically, we aimed to examine the effects of the intervention on muscle activation and the location of the ground reaction force (GRF) center of pressure. Sixteen subjects (age 18-35 yrs.; male (n=14); female (n=2)), with at least 1 year of deadlifting experience, were randomly assigned into a control and intervention group (both n=8). Both groups performed two sets of three repetitions of deadlifts at 50% and at 80% of their estimated one repetition maximum (1-RM). The intervention group received a Postural Restoration inspired breathing exercise routine after three sets, while the control group rested. The deadlift tests were then repeated. We found no significant muscle activation differences for the intervention group for the back extensors, gluteus, hamstrings (biceps femoris long head and semitendinosus), or oblique activation during the hexagonal bar deadlift (p>0.05). The anteroposterior center of pressure waveforms demonstrated a more posterior force for the right foot post intervention with a 50% 1-rep max load, occurring during the first 25% of the concentric phase (p |
