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SHOULDER AND HIP KINEMATICS ACROSS RUNNING GAIT CYCLE: INVESTIGATING CONTRALATERAL RELATIONSHIPS

Abstract

There is an understudied role of myofascia in running biomechanics. The posterior oblique sling system is involved in force transmission between the glenohumeral joint and the contralateral pelvic region. PURPOSE: To investigate contralateral and reciprocal shoulder and hip kinematic relationships during running. METHODS: The study population consisted of 28 college-aged students with self-reported running experience. Participants engaged in a five-minute treadmill running task of increasing speed based on Borg’s 6-20 RPE Scale. Participants spent 2 minutes at RPE’s of 10 and 12, followed by a data collection phase after 1 minute at RPE 14. Slow-motion videos of at least 10 full strides were recorded at 1080 fps on left and right sagittal planes. Videos were later analyzed using Dartfish Motion Capture technology to measure shoulder and hip angles at left and right initial contact and toe-off gait phases. The first complete right and left stride during the data collection phase were analyzed. RESULTS: Contralateral shoulder and hip were not significantly correlated at either right or left initial contact or toe-off, with all r values less than 0.1 and all p values greater than 0.1. CONCLUSION: No conclusive relationship between contralateral shoulder and hip during running gait cycle was observed. We see potential evidence of meaningful symmetries and asymmetries in contralateral shoulders and contralateral hips, prompting further research that uses a more sensitive methodology to detect a reciprocal relationship.

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