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Table 9.

Scaling relationship of the ratio of physiological cross-sectional area to vastus lateralis mass (PCSA/VL mass) and body mass for mouse, rat, cat, human and horse hindlimb muscles

MusclebaR2
AddL –0.39 0.05 0.90* 
RF –0.30 0.48 0.80* 
VL –0.29 0.44 0.99* 
VM –0.23 0.04 0.79* 
VI –0.19 –0.44 0.96* 
GR –0.08 –1.10 0.10 
BF –0.47 0.91 0.94* 
ST –0.34 0.14 0.84* 
SM –0.15 –0.41 0.59 
GLH –0.32 0.44 0.83* 
GMH –0.28 0.35 0.91* 
SOL 0.04 –1.22 0.06 
PLA –0.56 0.61 0.78 
TP –0.12 –0.79 0.44 
FDL –0.25 0.00 0.37 
FHL –0.26 –0.28 0.35 
TA –0.30 0.11 0.87* 
EDL –0.19 –0.64 0.81* 
All muscles –0.26±0.03   
Proximal muscles –0.27±0.04   
Distal muscles –0.25±0.05   
Plantarflexors –0.25±0.07   
Dorsiflexors –0.24±0.06   
Hamstrings –0.32±0.09   
Quadriceps –0.25±0.03   
MusclebaR2
AddL –0.39 0.05 0.90* 
RF –0.30 0.48 0.80* 
VL –0.29 0.44 0.99* 
VM –0.23 0.04 0.79* 
VI –0.19 –0.44 0.96* 
GR –0.08 –1.10 0.10 
BF –0.47 0.91 0.94* 
ST –0.34 0.14 0.84* 
SM –0.15 –0.41 0.59 
GLH –0.32 0.44 0.83* 
GMH –0.28 0.35 0.91* 
SOL 0.04 –1.22 0.06 
PLA –0.56 0.61 0.78 
TP –0.12 –0.79 0.44 
FDL –0.25 0.00 0.37 
FHL –0.26 –0.28 0.35 
TA –0.30 0.11 0.87* 
EDL –0.19 –0.64 0.81* 
All muscles –0.26±0.03   
Proximal muscles –0.27±0.04   
Distal muscles –0.25±0.05   
Plantarflexors –0.25±0.07   
Dorsiflexors –0.24±0.06   
Hamstrings –0.32±0.09   
Quadriceps –0.25±0.03   

Scaling equation is in the form Y=aMb where Mis body mass. R2 is shown for the line describing the relationship between log-transformed variables. Scaling exponents for muscle groups are shown (means ± s.e.m.)

For muscle names, see text

*

P<0.05

0.05<P<0.13

Horse not included in muscle data set

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