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Table 3.

Loadings from a principal components analysis including 13 variables related to pMG muscle function

VariablePC1PC2PC3
Strainforce onset to force max –0.08 0.94 0.23 
Strainforce max to force offset 0.60 –0.14 0.17 
Strainswing –0.80 –0.23 –0.37 
Strainnet 0.23 0.86 0.31 
Forcemax 0.95 0.02 –0.13 
Forcemean 0.97 0.01 0.05 
Forceduration –0.01 –0.30 0.93 
Stressmax 0.70 –0.57 –0.38 
Stressmean 0.75 –0.54 –0.16 
EMGduration 0.14 –0.19 0.91 
EMGonset relative to force onset 0.00 0.66 –0.37 
MSA 0.56 0.54 –0.45 
RIA 0.67 0.40 0.23 
VariablePC1PC2PC3
Strainforce onset to force max –0.08 0.94 0.23 
Strainforce max to force offset 0.60 –0.14 0.17 
Strainswing –0.80 –0.23 –0.37 
Strainnet 0.23 0.86 0.31 
Forcemax 0.95 0.02 –0.13 
Forcemean 0.97 0.01 0.05 
Forceduration –0.01 –0.30 0.93 
Stressmax 0.70 –0.57 –0.38 
Stressmean 0.75 –0.54 –0.16 
EMGduration 0.14 –0.19 0.91 
EMGonset relative to force onset 0.00 0.66 –0.37 
MSA 0.56 0.54 –0.45 
RIA 0.67 0.40 0.23 

PC1, PC2 and PC3 explained 36.4, 25.5 and 19.9% of the total variance,respectively

pMG, proximal region of the medial gastrocnemius; EMG, electromyogram; MSA,mean spike amplitude of the EMG burst; RIA, rectified integrated area of the EMG burst

Loadings >0.6 are in bold

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