Average single fiber (Fig. 2-A) and fiber-bundle (Fig. 2-B) elastic moduli for each muscle and tear group. These data indicated that single fiber elastic modulus decreases in the infraspinatus muscle when the supraspinatus muscle is torn. Importantly, supraspinatus muscle fiber-bundle modulus increases when the muscle is torn and becomes significantly higher than that in the infraspinatus. Asterisks indicate a significant difference (p < 0.05), and error bars represent the standard error of the mean.

Fig. 2-A.

Fig. 2-B.