Fig. 1From: The association between different physical activity levels and flexion-relaxation phenomenon in women: a cross-sectional studyThe comparison of FRR of erector spinae by different PA groups. A Welch ANOVA was used to compare the FRR, and further multiple comparisons of FRR were performed using the Games Howell Post-hoc Tests. FRR: Flexion-Relaxation Ratio, ANOVA: Analysis of variance, PA: Physical ActivityBack to article page