Effect Of Ice Hockey Repetitive Head Impacts On Dual Task Tandem Gait Performance

Abstract

Repetitive head impacts (RHI) may adversely affect neurophysiological health, but their effect of functional tasks remain to be further elucidated. PURPOSE: To determine the effect of RHI on single task (ST) and dual task (DT) tandem gait performance in collegiate ice hockey players. METHODS: 36 male collegiate ice hockey players (age: 19.7 + 1.2 y.o., ht: 1.80 + 0.06 m, wt: 80.9 + 6.8 kg, concussion history: 48.6% (17/36), 0.8 + 0.9 concussions) were assessed over the course of a club collegiate ice hockey season between 2016 and 2019. Head impact monitoring occurred during each practice and home game using the Smart Impact Monitor (SIM-G) through visual and/or video review. Participants performed five trials each of ST and DT Tandem Gait (TG) at pre-season, mid-season, and post-season. The DT challenges were working memory tasks which included subtraction, spelling, and reciting the months of the year backwards as the participant walked heel-to-toe down a 3-meter line, turned around, and returned. To assess changes over the course of the season, a repeated measures mixed model ANOVA was performed for ST and DT tandem gait total time with pairwise post-hoc on significant findings. RESULTS: There was a significant main effect for time for both ST tandem gait (p = 0.001, partial eta = 0.217) and DT tandem gait (p < 0.001, partial eta = 0.305). There was a significant improvement in ST tandem gait from Pre-season to Post-season (pre; 10.3 + 1.8 sec, post; 9.2 + 1.8 sec, p < 0.001, d = 0.61), but not Mid-Season (mid; 9.7 + 1.8 sec, p = 0.067). There was a significant main effect for time in DT tandem gait from pre-season to both mid-season (pre; 13.8 + 4.7 sec, mid; 12.2 + 3.3 sec, p = 0.001, d = 0.39) and Post-Season (post; 11.9 + 3.9 sec, p < 0.001, d = 0.43). CONCLUSION: Contrary to our hypothesis that repetitive head impacts experienced over the course of an ice hockey season would result in reduced/worsened tandem gait performance, the participants herein showed significant improvements over time with medium to large effects sizes. While prior studies have shown modest improvements in tandem gait performance with repeat administration, these results suggest that participation in collegiate club ice hockey season are not associated with postural control impairments as measured by either ST or DT tandem gait.