Table 2. Proportion of myosin heavy chain (MHC) isoforms (%) before and after a 54-week strength and power training program in the training and control groups. Values are means (± SD).
MHC isoforms (%)
Groups Before After
MHC I MHC IIa MHC IIx MHC I MHC IIa MHC IIx
Training group (n=16) 29.1 (13.3) 52.6 (12.2)*# 18.1 (11.4)# 29.4 (10.9) 59.4 (11.6) 11.1 (9.1)*
Control group (n=6) 22.8 (14.9) 70.2 (17.2) 6.8 (10.9) 25.8 (21.0) 67.3 (20.6) 7.0 (13.0)
* p < 0.05 in comparison with pre-training period,# p < 0.05 in comparison with control group.