Tetanic force corrected for body weight (g/kg) generated by the peroneus longus muscle of normal and GRMD dogs at 3 and 6 months of age. Values for the GRMD dogs are lower (P<.05)* at 3 months. However, although body-weight-corrected force is proportionally lower in normal dogs at 6 months, it has increased in GRMD dogs, such that values for the 2 groups are no longer significantly different. (Data from Kornegay JN, Sharp NJ, Bogan DJ, et al. Contraction tension and kinetics of the peroneus longus muscle in golden retriever muscular dystrophy. J Neurol Sci 1994;123:100–7.)