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Fig. 7. Power-cycle frequency relationships (means ± s.e.m.) at 4°C for
sartorius and external oblique muscles taken from (4°C) air-access control
frogs, normoxic cold-submerged frogs (1216 weeks in air equilibrated
water) and hypoxic cold-submerged frogs (1216 weeks in 60 mmHg
O2). A general linear model was used to test for changes in power
with cycle frequency and treatment, considering power as the dependent
variable and frequency and treatment as independent variables. Power was
significantly affected by cycle frequency but there was no significant effect
of treatment (Frequency F6,40=7.208, P<0.001;
Treatment F2,40=1.381, P=0.265). (G. N. Askew and
R. G. Boutilier, unpublished observations.)