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Table 3 Mean ± SD absolute and normalized root mean square values (absRMS (mV) and normRMS (% of the highest RMS values of the three maximum voluntary contractions)) of the left and right erector spinae surface electromyograms during standardized box lifting at day 1 and day 2, intraclass correlation coefficient (ICC3.K) values and between-day normRMS difference for left and right erector spinae

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 Day 1 (mV) Day 2 (mV) ICC3.K Difference (mV) Day 1 (mV) Day 2 (mV) ICC3.K Difference (mV)
Table to Table 3 kg
 Short reaching distance
  Left 41.2 ± 10.0 41.1 ± 12.1 0.79 −0.1 ± 9.2 14.1 ± 4.5 14.3 ± 5.0 0.92 0.2 ± 2.8
  Right 43.7 ± 17.6 45.3 ± 15.6 0.64 1.6 ± 17.1 15.3 ± 6.0 16.3 ± 9.1 0.77 1.0 ± 6.7
 Long reaching distance
  Left 52.0 ± 14.9 50.3 ± 16.1 0.90 −1.7 ± 9.1 17.4 ± 5.5 17.5 ± 6.8 0.91 0.1 ± 3.5
  Right 52.0 ± 20.4 52.0 ± 16.1 0.82 −0.0 ± 14.5 18.0 ± 6.1 17.8 ± 5.6 0.77 −0.2 ± 5.1
 Trunk rotation
  Left 57.4 ± 22.0 57.0 ± 18.2 0.88 −0.4 ± 13.4 18.8 ± 6.4 19.4 ± 5.9 0.86 0.6 ± 4.3
  Right 37.2 ± 19.9 31.7 ± 9.6 0.71 −5.5 ± 14.8 12.6 ± 5.6 10.8 ± 3.0 0.80 −1.8 ± 3.7
Table to Table 15 kg
 Short reaching distance
  Left 78.5 ± 25.7 72.9 ± 20.3 0.80 −5.6 ± 19.0 26.3 ± 9.3 25.0 ± 7.4 0.82 −1.3 ± 6.5
  Right 77.3 ± 30.1 77.8 ± 19.9 0.88 0.5 ± 17.0 26.9 ± 9.3 26.8 ± 8.3 0.88 −0.1 ± 5.7
 Long reaching distance
  Left 104.6 ± 34.4 96.7 ± 29.1 0.92 −7.9 ± 17.8 34.5 ± 11.5 32.6 ± 9.2 0.85 −1.9 ± 7.6
  Right 105.1 ± 42.8 99.4 ± 27.9 0.83 −5.7 ± 27.6 35.8 ± 10.5 33.8 ± 9.7 0.88 −2.0 ± 6.6
 Trunk rotation
  Left 94.3 ± 33.8 97.5 ± 35.1 0.86 3.2 ± 24.2 30.9 ± 10.0 33.0 ± 10.0 0.86 2.1 ± 6.9
  Right 71.2 ± 50.1 66.9 ± 19.7 0.51 −4.3 ± 43.6 23.7 ± 11.9 23.2 ± 9.4 0.63 −0.5 ± 11.1
Table to Table 30 kg
 Short reaching distance
  Left 123.5 ± 40.9 112.4 ± 33.6 0.88 −11.1 ± 24.7 41.3 ± 15.2 38.0 ± 10.4 0.79 −3.3 ± 10.9
  Right 124.2 ± 55.2 117.2 ± 35.4 0.88 −7.0 ± 30.0 42.5 ± 14.2 40.1 ± 13.4 0.90 −2.4 ± 8.5
Floor to Table 3 kg
 Short reaching distance
  Left 125.5 ± 57.4 117.9 ± 44.8 0.91 −7.6 ± 29.4 38.8 ± 7.1 38.8 ± 9.8 0.76 0.0 ± 7.5
  Right 135.1 ± 62.2 117.2 ± 42.0 0.88 −17.9 ± 34.3 45.0 ± 12.2 39.0 ± 9.6 0.75 −6.0 ± 9.8
 Long reaching distance
  Left 135.2 ± 60.9 117.9 ± 37.2 0.83 −17.3 ± 38.9 42.0 ± 8.9 39.3 ± 10.0 0.34 −2.7 ± 11.9
  Right 131.5 ± 57.3 120.2 ± 38.1 0.72 −11.3 ± 45.7 44.0 ± 11.4 40.3 ± 9.7 0.38 −3.7 ± 13.1
 Trunk rotation
  Left 122.8 ± 54.5 116.0 ± 35.6 0.89 −6.8 ± 28.6 38.2 ± 8.3 38.5 ± 8.1 0.65 0.3 ± 8.4
  Right 122.3 ± 54.1 120.6 ± 31.7 0.67 −1.7 ± 44.2 41.1 ± 10.8 41.2 ± 11.3 0.50 0.1 ± 12.8
Floor to Table 15 kg
 Short reaching distance
  Left 176.4 ± 69.9 172.4 ± 60.5 0.93 −4.0 ± 34.2 55.4 ± 10.8 57.1 ± 14.5 0.59 1.7 ± 13.8
  Right 181.2 ± 73.3 173.6 ± 58.8 0.88 −7.6 ± 44.3 60.3 ± 11.5 57.8 ± 13.5 0.48 −2.5 ± 14.6
 Long reaching distance
  Left 195.0 ± 77.4 183.1 ± 56.3 0.87 −11.9 ± 45.2 61.4 ± 13.1 61.1 ± 15.9 0.21 −0.3 ± 19.3
  Right 197.1 ± 84.8 187.2 ± 66.6 0.85 −9.9 ± 55.5 65.5 ± 14.3 62.2 ± 15.4 0.33 −3.3 ± 18.8
 Trunk rotation
  Left 172.0 ± 55.8 165.3 ± 46.1 0.91 −6.7 ± 28.9 55.1 ± 10.1 55.3 ± 11.6 0.51 0.2 ± 12.4
  Right 179.3 ± 70.7 169.8 ± 45.9 0.88 −9.5 ± 39.6 59.8 ± 12.4 57.5 ± 13.3 0.59 −2.3 ± 13.8
Floor to Table 30 kg
 Short reaching distance
  Left 228.2 ± 84.7 209.3 ± 69.1 0.86 −18.9 ± 53.4 72.1 ± 13.8 70.5 ± 21.2 0.30 −1.6 ± 22.9
  Right 235.1 ± 95.0 214.1 ± 74.1 0.85 −21.0 ± 62.3 77.7 ± 13.9 71.2 ± 17.4 0.46 −6.5 ± 18.6
  1. Difference = difference in absRMS (mV) and normRMS (%) between day 1 and day 2. Forearm length = short distance, ¾ arm distance = long distance and trunk rotation = short distance with trunk rotation