LE3 .A278 2010

2010

Landry, Scott

Acadia University

Bachelor of Kinesiology

Honours

Kinesiology

Kinesiology

The aim of this study was to use surface electromyography ( EMG) to describe the muscle activity patterns of selected trunk and upper extremity muscles during accelerated and constant velocity sledge hockey propulsion. 15 healthy and active male athletes performed forward sledge hockey propulsion while surface EMG was used to measure muscle activity patterns of the latissimus dorsi ( LAT), teres major ( TMA), posterior deltoid ( PDT), anterior deltoid ( ADT), triceps brachii ( TRI), biceps brachii ( BIC) and pectoralis major ( PMA). EMG data was MVC ( maximum voluntary contraction) normalized and then RMS ( root mean square) magnitudes were compared between an accelerated and constant velocity stride for both the ground contact and swing phases using a one‐ way repeated measures ANOVA. Muscle activity levels were greater for the constant maximum velocity stride than the accelerated stride. LAT demonstrated the greatest difference in magnitude between the 2 strides ( p < 0.001). Comparisons between strides for all other muscles in ground contact and swing showed significant differences ( p < 0.05), except for BIC during swing that only approached significance ( p = 0.061). Muscle activity levels were greater for the constant maximum velocity stride than the acceleration stride. LAT, TMA and TRI, produced the highest activity levels during the first portion of ground contact for both strides to move the arm and elbow into extension as the pick of the stick was brought down to the ice and pulled back to generate forward propulsion. PDT, ADT, BIC and PMA, produced the highest activity levels during the first half of swing for both strides, to initiate shoulder flexion and return the shoulder to the starting position in preparation for ground contact.

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https://scholar.acadiau.ca/islandora/object/theses:724