Figure 3. Rates of stretch-induced force transients in different fibre types of Xenopus laevis iliofibularis muscle expressed as 1/t₃ in a bar graph (A) and a scatterplot (B).

A, the dark and light grey columns are means ± s.d. for fibre types containing one and two MHC isoforms, respectively, with the number of fibres for each fibre type given in parentheses. Significant differences were found between all fibres types (P < 0.01; two-tailed Student's t test) except for X2 + 3 versus X3, and X3 + 4 versus X4. Kolmogorov-Smirnov tests indicate normal distribution for t₃ values of pure fibre types (P > 0.09 for type X1, P > 0.2 for types X2, X3 and X4) and lack of normal distribution for t₃ values of tonic fibres (type XT + 1, P = 0.01).