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Table 5 Standard error of measurement (SEM (mV)), standard error of measurement in percent (SEM% (%)), minimal detectable change (MDC (mV)) and minimal detectable change in percent (MDC% (%)) of the absolute and normalized root mean square values of the left and right erector spinae surface electromyography during standardized box lifting

From: Inter-day reliability of surface electromyography recordings of the lumbar part of erector spinae longissimus and trapezius descendens during box lifting

  Erector Spinae
Absolute sEMG Normalised sEMG
Lifting condition SEM (mV) SEM % (%) MDC (mV) MDC % (%) SEM (mV) SEM % (%) MDC (mV) MDC % (%)
Table to Table 3 kg
 Short reaching distance
  Left 5.0 12.2 13.9 33.9 1.5 10.2 4.0 28.3
  Right 10.0 22.4 27.6 62.0 3.7 23.6 10.3 65.3
 Long reaching distance
  Left 4.8 9.4 13.3 26.0 1.8 10.5 5.1 29.2
  Right 7.9 15.2 21.9 42.0 2.9 15.9 7.9 44.1
 Trunk rotation
  Left 7.1 12.4 19.7 34.4 2.3 11.9 6.3 33.0
  Right 8.6 24.8 23.7 68.8 2.1 17.5 5.7 48.5
Table to Table 15 kg
 Short reaching distance
  Left 10.5 13.8 29.0 38.4 3.6 13.9 9.9 38.4
  Right 9.0 11.6 24.9 32.1 3.0 11.2 8.4 31.1
 Long reaching distance
  Left 9.4 9.3 25.9 25.8 4.1 12.1 11.3 33.6
  Right 15.0 14.6 41.4 40.5 3.5 10.2 9.8 28.1
 Trunk rotation
  Left 12.9 13.5 35.8 37.4 3.7 11.6 10.3 32.3
  Right 26.7 38.6 73.9 107.0 6.5 27.7 18.0 76.8
Table to Table 30 kg
 Short reaching distance
  Left 13.2 11.2 36.6 31.0 6.0 15.2 16.7 42.0
 Right 15.9 13.2 44.1 36.5 4.5 10.9 12.4 30.1
Floor to Table 3 kg
 Short reaching distance
  Left 15.4 12.7 42.7 35.1 4.2 10.8 11.6 29.9
  Right 18.4 14.6 51.0 40.4 5.7 13.5 15.7 37.3
 Long reaching distance
  Left 21.4 16.9 59.4 46.9 7.8 19.1 21.5 52.9
  Right 26.1 20.7 72.1 57.4 8.4 20.0 23.4 55.4
 Trunk rotation         
  Left 15.1 12.6 41.8 35.0 4.9 12.7 13.5 35.3
  Right 25.5 21.0 70.8 58.3 7.8 19.0 21.7 52.7
Floor to Table 15 kg
 Short reaching distance
  Left 17.7 10.2 49.2 28.2 8.2 14.6 22.7 40.3
  Right 23.5 13.3 65.2 36.8 9.1 15.3 25.1 42.5
 Long reaching distance
  Left 24.1 12.7 66.8 35.3 12.9 21.0 35.7 58.3
  Right 29.9 15.9 82.8 43.1 12.3 19.2 34.0 53.2
 Trunk rotation         
  Left 15.1 8.9 41.8 24.8 7.6 13.7 21.0 38.1
  Right 21.1 12.1 58.4 33.5 8.2 14.0 22.8 38.9
Floor to Table 30 kg
 Short reaching distance
  Left 28.7 13.1 79.5 36.3 15.0 21.0 41.5 58.1
  Right 33.8 15.0 93.6 41.7 11.8 15.9 32.7 44.0
  1. Forearm length = short distance, ¾ arm distance = long distance and trunk rotation = short distance with trunk rotation