Wakeling et al [Wakeling et al., 2007] reported mean frequency of lower extremity muscles
for 36 children and adolescents with TD and 17 with spastic diplegic CP. The mean
frequency for the rectus femoris in the CP group is consistent with that obtained in this
study. The CP mean frequency reported for the semimembranosus is slightly higher than
that obtained in the current study for the semitendinosus muscle. The TD data for both of
these muscles in the current study is lower than that reported for the control group in
Wakeling’s study, which may be a result of the older age of the control group in that study
(mean age 10.8 years), but requires further investigation.