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Table 1.

Isotopic incorporation rate, percentage of metabolism supported by oxidation of exogenous sugar, total and mass-specific oxidation rate of exogenous sugar and mass-specific oxygen consumption rate of Pallas'long-tongued nectar bats Glossophaga soricina, and hummingbirds Selasphorus rufus and Calypte anna during hovering and humans (Homo sapiens) during exercise at 50% of maximal oxygen consumption rate*

SpeciesAverage Mb (g)k′ (% min–1)fexoMexo (mg min–1)Mexo/Mb (mg min–1g–1)Mexo/Mb (mg min–1kg–1)O2/Mb(ml g–1 h–1)
Homo sapiens 74 100±1900 (9) – 32.4 1220±70 (9) 0.02 16.5 2.31 
Glossophaga soricina 10.2±0.1 (7) 7.0±1.7 (7) 77.6±4.8 (7) 3.80±0.22 (7) 0.37±0.02 (7) 366.8±20.8 (7) 21.29±0.60 (7) 
Selasphorus rufus 3.4±0.1 (10) 11.8±1.4 (10) 94.7±1.5 (10) 2.45±0.07 (10) 0.71±0.01 (10) 713.7±13.4 (10) 33.70±0.45 (10) 
Calypte anna 4.8±0.3 (2) 7.8±3.2 (2) 95.5±1.5 (2) 3.49±0.08 (2) 0.72±0.05 (2) 715.0±48.5 (2) 33.36±1.76 (2) 
SpeciesAverage Mb (g)k′ (% min–1)fexoMexo (mg min–1)Mexo/Mb (mg min–1g–1)Mexo/Mb (mg min–1kg–1)O2/Mb(ml g–1 h–1)
Homo sapiens 74 100±1900 (9) – 32.4 1220±70 (9) 0.02 16.5 2.31 
Glossophaga soricina 10.2±0.1 (7) 7.0±1.7 (7) 77.6±4.8 (7) 3.80±0.22 (7) 0.37±0.02 (7) 366.8±20.8 (7) 21.29±0.60 (7) 
Selasphorus rufus 3.4±0.1 (10) 11.8±1.4 (10) 94.7±1.5 (10) 2.45±0.07 (10) 0.71±0.01 (10) 713.7±13.4 (10) 33.70±0.45 (10) 
Calypte anna 4.8±0.3 (2) 7.8±3.2 (2) 95.5±1.5 (2) 3.49±0.08 (2) 0.72±0.05 (2) 715.0±48.5 (2) 33.36±1.76 (2) 

Values are means ± s.e.m. (N)

k′, isotopic incorporation rate; fexo,percentage of metabolism supported by oxidation of exogenous sugar; Mexo, total and Mexo/Mb, mass-specific oxidation rate of exogenous sugar; O2/Mbmass-specific oxygen consumption rate; O2max, maximal oxygen consumption rate

*

(Jentjens et al.,2004b)

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