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Comparison of product- and process-oriented measures of Supine-to-Stand measures in US Army Basic Combat Training Trainees

Abstract

Nate Orth1, Amy F. Hand1, Danielle Nesbitt1,2, Bryan Terlizzi1, Ryan S. Sacko3

1University of South Carolina, Columbia, South Carolina, USA, 2Fayetteville State University, Fayetteville, North Carolina, USA, 3The Citadel, Charleston, South Carolina, USA

Supine-to-Stand (STS) has been used extensively across the lifespan to assess functional strength and motor competence. Product- and process-oriented measures of STS may be useful when evaluating total body fitness in US Army Basic Combat Training (BCT) trainees. PURPOSE: To examine associations between product- and process-oriented assessments of STS in US Army BCT trainees. METHODS: These data were part of a larger study conducted by the US Army Research Institute of Environmental Medicine (USARIEM). Participants included individuals enrolled in Army BCT (N=710; males: n=434, age: 21.0±3.6 years, BMI: 17.5±3.9; females: n=276, age: 20.2±3.4, BMI: 16.3±2.8). Participants completed five trials of STS with ‘maximal effort’. Product- (time) and process- (upper extremity; UE, lower extremity; LE, and Axial) oriented measurements were analyzed from videotaped STS trials using DartFishTM. Interrater reliability was determined using Cohen’s Kappa (UE, LE, Axial range: k=0.81-0.93 with 95%CI). Paired t-tests were used to analyze sex differences. Product-(peak time) and process- (sum of UE, LE, Axial modes) oriented measures were z-transformed and Spearman’s Rho correlations were calculated to determine the strength of associations [correlations; low (r=0.10–0.29), moderate (r=0.30–0.49) and high (r≥0.50)]. RESULTS: Product: males; 1.64±0.33s, females: 1.9±0.35s. Process: sum 11.6±1.5. There were no significant differences between sexes for product. For all participants, correlations between product and process measures (UE r=0.26, axial r=0.27, total r=0.25, p<.01) were low. The Axial region component level was the strongest indicator for time to stand (r= 0.27). Higher BMI correlated to slower times to standing (r=0.24) and lower total process (r=0.44). CONCLUSION: STS is one of many measures that are under investigation for use as an assessment tool for total body fitness in US Army BCT trainees. These data illustrate the continued need to evaluate both product- and process-oriented measure of STS. Future aims of this continuing study will evaluate risk of injury based upon STS product- and process-oriented measures.

Disclaimer: The views expressed in this abstract are those of the authors and do not reflect the official policy of the Department of Army, Department of Defense, or the US Government.

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