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Background: Bipedal leg squat is a common rehabilitation exercise. It is used for evaluation of lower limb function and pelvis and core stability. The aim of this study was a comparison of the lower limb, pelvis and spine ranges of motion in subjects with different declared physical activity level during bipedal squat. Material and methods: Twenty healthy student-volunteers took part in this investigation. Based on the author’s questionnaire, they were divided into two groups: “higher” and “lower” physical activity level. Participants performed a two-leg squat with maximal depth, and returned to the standing position. The tridimensional motion of the ankle, knee, hip, pelvis and spine was analysed. Results: During a bipedal squat the more active subjects demonstrate a greater ankle range of motion (42.585 deg) and smaller pelvis (17.293 deg) and spine (40.228 deg) mobility in the sagittal plane than the less active participants (33.819 deg, 29.178 deg and 63.279 deg respectively). The more active group demonstrate a decreased motion of the ankle in the frontal plane (4.173 deg; 10.839 deg, p = 0.006) and an increased motion of the hip in the transverse plane (39.765deg; 27.971 deg, p = 0.035) than less the active one. Conclusions: The level of activity can lead to different movement patterns during multi-joint exercises.
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