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Table 1 Correlation coefficient analysis in elderly (n = 88)

From: Relationships between muscle strength and multi-channel surface EMG parameters in eighty-eight elderly

   R P  
MVC Age − 0.111 0.324  
  MT 0.524 < 0.001 *
  ST −0.150 0.182  
  ME 0.056 0.622  
  RMS 0.361 0.001 *
  NRMS 0.327 0.003 *
  CRR −0.180 0.108  
  1. MVC, maximal voluntary isometric knee extension joint torque; MT, Muscle thickness of vastus lateralis; ST, subcutaneous tissue thickness; ME, modified entropy of surface electromyography at 65% of the maximal voluntary contraction; RMS, root mean square value of surface electromyography for all channels in electrode grid at 65% of the maximal voluntary contraction; NRMS, root mean square of surface electromyography for all channels in electrode grid at 65% of the maximal voluntary contraction normalized by that at 20% of the maximal voluntary contraction; CRR, correlation coefficient value in root mean square of surface electromyography between 20 and 65% of the maximal voluntary contraction
  2. * indicates significant correlation