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Table 3 Partial correlation coefficients of explosive muscle strength with influencing factors (n = 59)

From: Association of age-related decrease in intracellular-to-total water ratio with that in explosive strength of the plantar flexors: a cross-sectional study

  Explosive muscle strength
RTD0–50 RTD50–100 RTD100–200 nRTD0–50 nRTD50–100 nRTD100–200
rp P rp P rp P rp P rp P rp P
Maximal muscle strength
 PTMVC 0.539 < 0.001 0.644 < 0.001 0.860 < 0.001
Twitch contractile properties
 PTtwitch 0.480 < 0.001 0.522 < 0.001 0.525 < 0.001 0.252 0.056 0.307 0.019 0.199 0.135
 RTDtwitch 0.531 < 0.001 0.558 < 0.001 0.481 < 0.001 0.311 0.017 0.352 0.007 0.177 0.185
 TPTtwitch −0.361 0.005 −0.313 0.017 −0.080 0.551 −0.312 0.017 −0.272 0.039 −0.021 0.875
Neuromuscular activities
 nRMS-RTD0–50 0.607 < 0.001 0.648 < 0.001
 nRMS-RTD50–100 0.569 < 0.001 0.624 < 0.001
 nRMS-RTD100–200 0.527 < 0.001 0.557 < 0.001
  1. MVC maximal voluntary contraction, nRMS normalized root mean square, nRTD normalized rate of torque development, PT peak torque, RTD rate of torque development, TPT time-to-peak torque, VA voluntary activation