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Fig. 2. Oxygen consumption
(
O2) (A),
lactate production (B), total ATP production (C), twitch force (D) and twitch
force relative to total ATP production (E) are presented for isolated turtle
(left) and trout (right) ventricular muscle. Preparations were either
stimulated at 30 min-1 (N=8 for both turtle and trout) or
left to rest (N=7 for both turtle and trout). For all parameters,
values are means ± S.E.M. of the average obtained over the
30 min period of oxygenation and over the last 30 min of the 70 min hypoxic
period, respectively. Asterisks signify differences between stimulation and
rest,
signifies differences between oxygenation and
hypoxia and
signifies differences between turtle and
trout.