Fig. 4

A-B. Differences in serial sarcomere number at post-cast (n = 5 young, n = 5 old) and 4 weeks of recovery (n = 5 young, n = 6 old) compared to control muscles. Data are displayed as mean ± standard deviation. *Significant difference between indicated points (P < 0.05). C-D. Time-course changes in serial sarcomere number throughout casting (n = 10 young, n = 11 old) and recovery (n = 5 young, n = 6 old), estimated using ultrasound-derived fascicle length. C shows absolute values with individual data (grey lines), on which statistical analyses were performed. D shows data normalized to pre-cast. Data are displayed as mean ± standard deviation. *Difference from pre-cast (P < 0.05)