Table 2

Finger blood flow2-151 measured in the exposed (right) middle finger of 10 healthy subjects before, during and after exposure to 125 Hz vibration with varying acceleration magnitudes and durations but with the same 8 hour energy equivalent frequency weighted acceleration magnitude (∼1.4 m/s2) as the time dependency recommended by the international standard ISO 5349 (1986)

Vibration 44 m/s2, 30 min Vibration 62 m/s2, 15 min Vibration 88 m/s2, 7.5 min Vibration 125 m/s2, 3.75 min Vibration 176 m/s2, 1.88 min
Before exposure18.9 (2.7)17.7 (2.9)16.3 (2.1)15.4 (2.5)19.7 (2.2)
Exposure (min):
 E 0.510.5 (2.5)9.5 (2.4)8.6 (2.1)7.9 (1.2)6.9 (1.2)
−45.8% (−24.5% to −65.5%)−46.5% (−24.7% to −68.3%)−47.7% (−34.3% to −61.0%)−42.8% (−26.4% to −59.2%)−61.4% (−45.0% to −77.8%)
 E 1.58.8 (2.0)7.3 (1.9)7.7 (1.3)8.0 (1.2)8.7 (2.4)
−46.6% (−19.5% to −73.7%)−58.0% (−37.9% to −78.1%)−50.8% (−38.4% to −63.2%)−45.0% (−25.1% to −62.2%)−54.2% (−25.9% to −82.6%)
 E 3.59.6 (1.9)6.7 (1.8)8.2 (1.3)9.3 (1.6)
−44.5% (−23.3% to −65.6%)−59.2% (−37.2% to −81.1%)−49.1% (−38.1% to −60.1%)−40.1% (−24.3% to −57.2%)
 E 5.510.1 (2.4)7.5 (1.9)7.4 (1.4)
−42.6% (−17.9% to −67.4%)−54.1% (−30.1% to −78.0%)−56.5% (−45.2% to −67.8%)
 E 7.510.2 (1.9)6.4 (1.4)7.1 (1.2)
−44.6% (−29.2% to −60.0%)−60.8% (−44.3% to −77.2%)−57.1% (−48.4% to −65.8%)
 E 158.2 (1.4)7.7 (1.4)
−54.1% (−40.7% to −67.4%)−46.9% (−18.0% to −75.9%)
 E 22.59.5 (2.1)
−45.8% (−26.1% to −65.6%)
 E 309.2 (1.4)
−44.1% (−25.4% to −62.9%)
Recovery (min):
 R 0.516.5 (2.3)15.2 (1.8)18.6 (3.2)15.2 (2.4)17.1 (2.5)
+1.3% (−34.9% to 37.5%)−8.2% (−26.2% to 9.9%)+10.1% (−13.1% to 33.4%)−6.0% (−39.3% to 27.3%)−16.3% (−32.9% to 0.3%)
 R 1.517.5 (3.1)15.3 (2.1)17.4 (3.1)14.7 (2.1)17.4 (2.6)
−1.9% (−27.9% to 23.9%)−6.6% (−27.9% to 14.7%)+0.3% (−23.1% to 23.7%)−7.3% (−40.6% to 26.3%)−12.8% (−32.2% to 6.5%)
 R 3.514.9 (2.4)17.0 (2.2)17.2 (2.7)14.9 (2.3)17.5 (3.6)
−9.2% (−45.1% to 26.8%)+0.7% (−16.7% to 18.1%)+4.1% (−22.4% to 30.6%)−4.4% (−37.7% to 28.9%)−14.1% (−42.9% to 14.7%)
 R 5.514.4 (2.5)17.4 (2.0)16.8 (3.0)16.9 (2.9)17.5 (3.5)
−15.3% (−42.6% to 11.9%)+12.0% (−20.7% to 44.7%)+0.5% (−26.3% to 27.2%)+10.6% (−9.4% to 30.7%)−12.8% (−42.3% to 16.7%)
 R 7.513.7 (2.3)14.6 (2.3)16.3 (3.0)16.1 (2.7)19.2 (3.9)
−22.3% (−45.2% to 0.6%)−11.9% (−34.3% to 10.4%)−5.3% (−34.3% to 23.8%)+5.4% (−20.8% to 31.7%)−4.6% (−40.1% to 30.9%)
 R 1514.1 (1.6)13.9 (2.5)16.0 (2.6)16.6 (2.1)17.3 (3.2)
−16.9% (−39.3% to 5.6%)−15.6% (−46.7% to 15.5%)−6.5% (−30.0% to 17.1%)+17.8% (−14.2% to 49.7%)−16.0% (−38.4% to 6.4%)
 R 22.59.3 (1.2)11.8 (1.3)15.2 (2.6)15.6 (2.3)17.6 (2.6)
−42.9% (−24.9% to −60.8%)−20.4% (−50.4% to 9.5%)−8.1% (−43.6% to 27.2%)+6.1% (−28.7% to 40.8%)−8.8% (−32.9% to 15.4%)
 R 308.2 (1.4)10.0 (1.2)13.7 (2.3)14.6 (2.2)15.3 (2.0)
−54.4% (−44.4% to −64.4%)−31.2% (−1.3% to −61.1%)−17.4% (−50.5% to 15.7%)+3.2% (−36.1% to 42.5%)−22.9% (−43.1% to 2.7%)
 R 37.57.9 (1.4)7.5 (1.1)12.7 (2.4)13.2 (2.3)16.2 (1.7)
−54.4% (−42.2% to −66.5%)−54.4% (−41.2% to −67.6%)−25.8% (−53.2% to 1.7%)−6.5% (−39.8% to 26.8%)−15.2% (−32.5% to 2.1%)
 R 457.5 (0.8)9.0 (1.3)11.9 (2.0)13.8 (2.5)14.4 (2.1)
−44.5% (−9.6% to −79.3%)−43.2% (−24.9% to −61.5%)−29.1% (−5.5% to −52.7%)−2.5% (−45.4% to 40.4%)−22.1% (−49.5% to 5.4%)
ANCOVA (p value)2-150 <0.0001<0.0001<0.00010.00250.011
  • 2-150 p Values of repeated measures analysis of covariance (ANCOVA) are adjusted by age, finger volume, and room temperature.

  • 2-151 Mean (SEM) values (ml/100 ml/min) and mean (95% CI) for the percentage changes in finger blood flow compared with the measures before exposure are given.