Fig. 4From: The association between different physical activity levels and flexion-relaxation phenomenon in women: a cross-sectional studyThe comparison of ERR of multifidus by different PA groups. A Welch ANOVA was used to compare the ERR, and further multiple comparisons of ERR were performed using the Games Howell Post-hoc Tests. ERR: Extension-Relaxation Ratio, ANOVA: Analysis of variance, PA: Physical Activity.Back to article page