Document Type

Thesis - Open Access

Award Date

2021

Degree Name

Master of Science (MS)

Department

Health and Nutritional Sciences

First Advisor

Matt Vukovich

Keywords

Body Composition, Competitive Season, Energy Balance, Hockey, Strength

Abstract

Purpose: This study investigated the body composition and strength changes of NAHL junior hockey players across a competitive season. It was hypothesized that players would lose lean body mass loss from pre-season to end-season. The secondary hypothesis was that players would lose strength in relation to the anticipated loss in lean body mass. Methods: Outcome measurements were taken at pre-season, mid-season, and endseason points of a competitive NAHL junior hockey season (n = 15, age = 19.1 years). Body composition was measured using air plethysmography (BodPod) and strength was measured using isokinetic strength testing (Biodex). Results: No significant changes in body composition were observed during the competitive season. Knee-extension time to peak torque at 60 deg/sec was significantly higher during the pre-season (675.7 ± 250.8 msec) than during the mid-season (451.4 ± 96.5 msec) and post-season (465.7 ± 82.2 msec) (p<0.05). Time to peak torque showed no significant change at any other velocity in knee-extension measurements during the season. Knee-flexion relative peak torque at 60 deg/sec and 150 deg/sec significantly decreased from pre-season to mid-season (96.2 ± 19.3 ft*lb/kg to 72.8 ± 13.3 ft*lb/kg, 65.5 ± 9.0 ft*lb/kg to 49.6 ± 11.3 ft*lb/kg). During the second half of the season, relative peak torque at 150 deg/sec significantly increased to near pre-season levels (49.6 ± 11.3 ft*lb/kg to 67.4 ± 14.0 ft*lb/kg). Total work at 60, 150, and 300 deg/sec increased during the second half of the season (495.4 ± 158.3 ft*lb to 764.2 ± 127.0 ft*lb; 330.9 ± 149.0 ft*lb to 609.8 ± 72.7 ft*lb; 196.1 ± 130.8 ft*lb to 370.0 ± 114.4 ft*lb). There were no significant differences between the pre-season and end-season measurements of peak torque, relative peak torque, time to peak torque, or total work for knee flexion. Conclusion: No significant changes in lean body mass or total body mass were observed in junior hockey players during their competitive season. This indicates that the players attained energy balance throughout the season. Additionally, players did not experience changes in peak torque, relative peak torque, or time to peak torque in kneeextension or knee-flexion. Players did, however, experience a significant increase of total work in knee extension. These results suggest lower body strength was successfully maintained throughout the season. Lastly, players displayed low levels of sports nutrition knowledge on the SNKQ.

Number of Pages

42

Publisher

South Dakota State University

Rights

Copyright © 2021 the Author

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