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Fig. 5. Ratio of lipolytic rate (Ra glycerol) over metabolic
rate (
O2) for vertebrates
measured to date. Values correspond to vertebrates at rest and during exercise
at equivalent intensities (40–70%
O2,max), except for birds,
where only data for shivering are available
(Vaillancourt and Weber,
2007). Ratios were calculated from the following studies: rat
(McClelland et al., 2001),
goat (Weber et al., 1993), dog
(Issekutz et al., 1967;
Issekutz et al., 1975), human
(Wolfe et al., 1990), ruff
sandpiper (Vaillancourt and Weber,
2007) and trout [present study and Bernard et al.
(Bernard et al., 1999) using
O2 values from Burgetz et
al. (Burgetz et al., 1998)].
The broken line shows the calculated average ratio for resting and exercising
endotherms (0.016).
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