Changes In Kinematics After Twelve Weeks Of Concurrent High Intensity Resistance Training

PURPOSE: To examine kinematic changes between men and women after 12 weeks of concurrent high intensity resistance training. METHODS: 16 men(28 ± 4 yrs,179 ± 8 cm,86 ± 13 kg) and 14 women(27 ± 6 yrs,165 ± 6 cm,63 ± 11 kg) completed a twelve-week high intensity concurrent resistance training program. 3D kinematics were captured with an eight-camera marker-less motion capture system, pre and post training intervention. An overhead squat (OH), front lunge (FL), lateral lunge (LL), lateral bounds, multiple hops, unilateral jump (UJ), vertical jump and drop jump were completed consecutively after a standard warm up. OH, FL, LL, and UJ results were analyzed. Effects of time and sex were analyzed using two-way mixed-measure ANOVA reporting mean and standard error. RESULTS: A main effect of group in FL hip mobility (L:p = .001 η2partial = .31;R:p = .001 η2partial = .31) show women (L: 95.9 ± 3.3; R: 94.7 ± 3.9) had greater degrees of hip mobility than men (L: 80.0 ± 3.0; R: 78.2 ± 3.2). FL stride length shows an interactive effect (L: p = .001; R: p = .037); stride length decreased in men (p = .001, η2partial = .52) over time and women show no change. A main effect of group in LL stride length (L: p < 0.001 η2partial = .45; R: p < .001 η2partial = .43) shows men (L: 114.8 ± 2.0; R: 112.8 ± 1.9) had a longer stride than women (L:100.6 ± 2.2; R: 99.6 ± 2.1). A main effect of group (L: p = .032 η2partial = .16; R: p = .009 η2partial = .22) shows women (L:47 ± 3.5; R: 43 ± 4.1) had higher degrees of hip flexion on landing than men (L: 36 ± 3.2; R: 40 ± 3.8). Landing left knee (p = .002, η2partial = .31) and ankle flexion (p = .044 η2partial = .137) show a main effect of group. Women (knee: 55 ± 2.5; ankle:27 ± 1.3) had higher degrees of flexion than men (knee:44 ± 2.3; ankle:23 ± 1.2). UJ total loading mobility shows a main effect of time (L: p < .001 η2partial = .26 R: p < .001 η2partial = .77); both groups decrease over time. A main effect of group (p = .009 η2partial = .21) in left leg landing mobility shows women (128.1 ± 6) had higher degrees of mobility than men (103 ± 5.9). On the right leg, an interactive effect (p = .033,η2partial = .15) shows women’s mobility decreased over time (126 ± 9.5). CONCLUSION: Comparing dynamic lower body movements men and women differ in mobility, stride length, and hip and knee flexion. Results suggest men and women have different joint mobility adaptations to resistance training. Supported by: UKMoD Grant WGCC 5.5.6-Task 0107