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BILATERAL ASYMMETRY IN STABILITY AND MOBILITY MEASURES OF RECREATIONAL ENDURANCE RUNNERS

Abstract

Mobility and stability have been assessed through functional movement tests (LQ-YBT, FMS) to identify potential injury risk factors among athletic populations. However, the potential bilateral asymmetries in recreational runner's mobility, stability, and run performance is unknown. PURPOSE: The purpose is to investigate bilateral asymmetries in mobility and stability characteristics of recreational endurance runners. METHODS: Seventeen participants [34.8(12)yrs,1.7(0.1)m,68.4(8.5)kg,21.9(6.1)BF%] with a weekly mileage of 30.6(19.5) participated in three sessions. In session one, each participant was assessed with body composition testing, an LQ-YBT test (Anterior, posterior-medial, Posterior-lateral, and Composite score), and FMS testing (Overhead Squat, In-line lunge, Hurdle step-over). The Graded exercise test was performed to identify the peak aerobic capacity and speed at Ventilatory Threshold (VT2). Participants performed a submaximal treadmill run until volitional exhaustion at 90% speed at VT2. Metabolic data were collected throughout the run, with motion capture data collected every minute of the run to assess changes in mechanics throughout the run. Multiple paired t-tests were conducted to assess the differences between limbs for the LQ-YBT and FMS (individual and composite data) (p<0.05). RESULTS: Bilateral asymmetries were found for LQ-YBT posterior-lateral and composite analyses (see table). CONCLUSION: The YBT posterior-lateral differences may indicate an imbalance of transverse and frontal plane loading of the hip during running. Future research should assess the relationship between injury history and these multiplanar bilateral asymmetries. COMPARISON MEAN (SD) MEAN DIFF (SD) t-STAT p-VALUE YBT_RT_ANT - YBT_LT_ANT 65.4(7) – 65.3(8.4) 0.11 (2.34) 0.20 0.842 YBT_RT_PM - YBT_LT_PM 102.2(9.9) – 102.6(9.5) -0.42 (2.33) -0.76 0.458 YBT_RT_PL - YBT_LT_PL 99.5(7.4) - 96.3(8.6) 3.97 (4.69) 3.48 0.003 YBT_RT_COMP - YBT_LT_COMP 97.7(7.3) – 96.6(7.7) 1.16 (2.17) 2.20 0.043

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