Postural Stability Changes During the 4 Phases of the Half Squat: Kinematics Profile of the Center of Pressure and Center of Mass in High-Performance Weightlifters—A Pilot Study

The repeated measures ANOVA on log-transformed CoPt ellipse area showed a highly significant main effect of the motion phase (F(1.65, 6.59) = 19.44, p = 0.002, ηp 2 = 0.829, 95% CI [0.55, 0.91]).

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Frequentist analysis showed a significant phase effect for CoPpi (F(1.94, 7.76) = 10.93, p = 0.006, ηp 2 = 0.732) and a marginal trend from CoPpd (F(1.97, 7.88) = 7.08, p = 0.014, ηp 2 = 0.639).

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Phase 4 showed a trend (corrected p = 0.074, d = −1.016).

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Although external load did not reach statistical significance in the frequentist analysis ( p = 0.177, achieved power = 0.27), the Bayesian model provided moderate evidence of a positive impact (β_load = 0.059, 95% HDI [0.005, 0.115], p = 0.981).

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