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EFFECTS OF ANAEROBIC FATIGUE ON TOTAL-BODY BIOMECHANICS USING MARKERLESS MOTION CAPTURE SYSTEM

Abstract

PURPOSE: This study compared the effects of various anaerobic fatigue tests [i.e. repeated jump test (RVJ), Resisted Sprint (RS), and control (CON)] using the Soccer Performance Assessment Scores (SPAS) in a markerless 3-dimesional motion capture system (MCS). METHODS: Fourteen women collegiate division two soccer athletes (age=21.81.6yrs., hgt.=167.74.6cm, wgt.=66.07.2kg) volunteered. Subjects were screened using the SPAS, consisting of 14 motions. Including shoulder abduction and adduction, horizontal abduction and adduction, internal and external rotation, flexion and extension, reverse lunge, overhead bilateral squat, forward lunges, lateral lunges, single-leg balance, bilateral vertical jump (VJ), unilateral VJ, depth VJ, lateral hop, and multi-unilateral VJ. The 3-D MCS (DARI Motion, Overland Park, KS) was used to analyze the kinetic and kinematic data, from which 192 variables were calculated and reported in the SPAS (Quality, Performance, and Overall). These scores are determined across all of the motions evaluated. Quality evaluates the execution of all motions. Performance evaluates the effectiveness, and Overall is a combination of the previous scores. Each subject completed three randomized experimental sessions (i.e. CON, RVJ, RS). The SPAS was collected pre- and post-session. During the RVJ test each subject was instructed to bend the knee to about 90 degrees and continue to jump explosively on landing for 10 sets. Each set consisted of 15 sec jumping and 15 sec rest. During the RS test each subject was instructed to complete a sprint on a resisted treadmill (Woodway, Waukesha, WI) with 18% of body mass resistance for 30 seconds. Statistical analyses were conducted on the SPAS (Quality, Performance, and Overall) x condition (RVJ, RS, CON) x time (pre-test, post-test) repeated measures MANOVA. RESULTS: The MANOVA indicated a two-way interaction time x score. Follow-up two-way ANOVA and pairwise comparisons indicated significant differences between the Performance and Overall among CON. In addition, significant differences between the Performance among RVJ (Table 1). CONCLUSION: The current investigation demonstrated the viability of a MCS test to evaluate changes in performance due to acute fatigue and determined acute lower-body biomechanical alterations following the RVJ.

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