Fig. 4From: Musculoskeletal application and validation of speckle-tracking ultrasonographyResults of 2D longitudinal biceps muscle strain. a, Muscle strain (%) correlated negatively with increasing load (%) (95% CI: -0.77% to − 0.35%; Pearson correlation coefficient). b, Strain analysis of the normal biceps muscle of ten subjects at different concentric load conditions (20, 40, and 60%) demonstrating increased strain rate with increasing load condition (One-way ANOVA p < 0.0001, F(2,62) = 15.62). Error bars represent s.d. (n = 10, four independent measurements/load condition). **p < 0.01; **** p < 0.0001Back to article page