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Table 1.

Body-mass-specific maximal oxygen uptake rate and structural variables from eight mammalian species obtained by statistically sampling the entire skeletal musculature

SpeciesnMb (kg)O2max (ml kg-1 min-1)Mm (kg)Vv(mc,f) (%)Vv(ms,f) (%)Vv(mt,f) (%)Vv(li,f) (%)Vv(fi,f) (%)Vv(re,f) (%)Na(c,f) (mm-2)
\({\bar{a}}\)
(f) (μm2)
Woodmouse 0.017±0.002 264±9.6 0.00836±0.0077 9.99±1.2 1.98±1.3 11.97±2.2 0.279±0.32 79.1±4.0 8.93±3.1 1270±277 1256±201 
Apodemus sylvaticus             
Guinea pig 21 0.607±0.12 55.8±6 0.178±0.025 3.97±1.1 2.12±0.9 6.09±1.4 0.105±0.098 79.6±2.7 14.3±1.7 821±157 1693±334 
Cavia porcellus             
Agouti 3.22 102 1.31 4.36 1.26 5.62 0.030 81.0 13.3 581 2367 
Agouti paca             
Fox 4.27±0.35 217±29 1.67±0.2 9.13±0.2 3.59±0.25 12.72±0.81 NA 80.9±0.049 6.30±0.31 827±88 1726±136 
Alopex lagopus             
Goat 12 32.4±8.3 59.8±9.2 12.0±7.6 3.29±0.48 0.72±0.31 4.01±0.77 0.0655±0.078 83.3±2.3 13.1±2.6 625±253 1809±243 
Capra hircus             
Dog 24.3±1.8 127±37 9.04±2.3 6.08±1.4 1.88±0.89 7.96±2.1 0.305±0.2 76.5±4.9 15.3±3.7 776±491 2070±467 
Canis familiaris             
Steer 474±21 51.2±2.1 165±5.1 2.96±0.41 0.597±0.12 3.56±0.53 0.045±0.007 79±0.47 18.1±5.7 727±9.6 1933±194 
Bos taurus             
Horse 447±61 136±6.7 191±28 4.85±0.36 2.62±0.62 7.47±0.94 0.243±0.051 73.2±2.2 19.1±1.5 928±62 2498±241 
Equus caballus             
SpeciesnMb (kg)O2max (ml kg-1 min-1)Mm (kg)Vv(mc,f) (%)Vv(ms,f) (%)Vv(mt,f) (%)Vv(li,f) (%)Vv(fi,f) (%)Vv(re,f) (%)Na(c,f) (mm-2)
\({\bar{a}}\)
(f) (μm2)
Woodmouse 0.017±0.002 264±9.6 0.00836±0.0077 9.99±1.2 1.98±1.3 11.97±2.2 0.279±0.32 79.1±4.0 8.93±3.1 1270±277 1256±201 
Apodemus sylvaticus             
Guinea pig 21 0.607±0.12 55.8±6 0.178±0.025 3.97±1.1 2.12±0.9 6.09±1.4 0.105±0.098 79.6±2.7 14.3±1.7 821±157 1693±334 
Cavia porcellus             
Agouti 3.22 102 1.31 4.36 1.26 5.62 0.030 81.0 13.3 581 2367 
Agouti paca             
Fox 4.27±0.35 217±29 1.67±0.2 9.13±0.2 3.59±0.25 12.72±0.81 NA 80.9±0.049 6.30±0.31 827±88 1726±136 
Alopex lagopus             
Goat 12 32.4±8.3 59.8±9.2 12.0±7.6 3.29±0.48 0.72±0.31 4.01±0.77 0.0655±0.078 83.3±2.3 13.1±2.6 625±253 1809±243 
Capra hircus             
Dog 24.3±1.8 127±37 9.04±2.3 6.08±1.4 1.88±0.89 7.96±2.1 0.305±0.2 76.5±4.9 15.3±3.7 776±491 2070±467 
Canis familiaris             
Steer 474±21 51.2±2.1 165±5.1 2.96±0.41 0.597±0.12 3.56±0.53 0.045±0.007 79±0.47 18.1±5.7 727±9.6 1933±194 
Bos taurus             
Horse 447±61 136±6.7 191±28 4.85±0.36 2.62±0.62 7.47±0.94 0.243±0.051 73.2±2.2 19.1±1.5 928±62 2498±241 
Equus caballus             

Values are means ± S.D.

NA, not available.

Mb, body mass; O2max, maximal oxygen consumption; Mm, muscle mass; Vv(mc,f),volume density of central mitochondria; Vv(ms,f), volume density of subsarcolemmal mitochondria; Vv(mt,f), Vv(mc,f)+Vv(ms,f); Vv(li,f), volume density of intracellular lipid droplets; Vv(re,f), volume density of remaining sarcoplasmic components; Na(c,f), capillary density;

\({\bar{a}}\)
(f), mean fibre cross-sectional area.

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