Fig. 6. Influence of seasonal acclimatisation (A) and laboratory acclimation (B,C,D) and on the power output of fast muscle fibres from the short-horn sculpin (Myoxocephalus scorpius). (A) The relationship between cycle frequency and power output (W kg^-1 wet muscle mass) of fast fibre bundles undergoing sinusoidal length changes. From Johnson and Johnston (1991). (B) Strain. (C) Maximum instantaneous and (D) mean power (W Kg^-1 wet muscle mass) output of fast fibres undergoing length change patterns recorded during the contralateral contraction of a fast-start escape response. Asterisks indicate significant differences between acclimation groups: ^*P<0.05, ^**P<0.001. Values are means ± S.E.M. (N=6 for 5°C-acclimated fish and N=7 for 15°C-acclimated fish). From Temple et al. (2000).