Inter-Segment Coordination of Male and Female Collegiate Ice Hockey Players During Forward Skating Starts.

Purpose : Coordination in ice hockey skating has been minimally investigated, particularly in females. The objective was to compare lower-extremity inter-segment coordination of collegiate male and female ice hockey players during forward skating starts. Methods : 3D kinematic data were collected on collegiate male ( n  = 9) and female ( n  = 10) participants during accelerative steps. Continuous relative phase (CRP) was calculated for shank- sagittal /thigh- sagittal , shank- sagittal /thigh- frontal , and foot- sagittal /shank- sagittal segment pairs across 2.5 strides on each side. Principal component analysis (PCA) extracted features of greatest variability of the CRP and relationships between principal components and sex were investigated using hierarchical linear model. Results : Males demonstrated more out-of-phase coordination (higher CRP) for side one ( p  = .01) and side two ( p  < .01) shank- sagittal /thigh- sagittal as well as side one shank- sagittal /thigh- frontal ( p  < .01) segment pairs throughout each step. Females demonstrated a greater change in CRP from late stance/early swing to late swing/early stance on side two for shank- sagittal /thigh- frontal segments ( p  < .01). For side two shank- sagittal /thigh- frontal segments, faster males utilized more out-of-phase coordination throughout each step whereas faster females utilized more in-phase coordination ( p  < .01). Conclusion : Males and females may employ different coordinative strategies to achieve faster skating speeds. Males tend to utilize more out-of-phase coordination of the shank and thigh throughout strides, although coordinative differences of the shank and foot were not found between sexes. Further investigation is needed to examine the relationship between lower limb strength and coordination as well as the effect of targeted training protocols on lower extremity coordinative patterns.