title: Frequency dependence of hand-arm vibration on palmar sweating response.
abstract: OBJECTIVE
  This study attempted to elucidate the effects of hand-arm vibration frequency on palmar sweating response.
  
  
  METHODS
  Palmar sweating was measured before and during vibration exposure on the right palm of six healthy men. The left hand was exposed for 3 minutes to the following root mean square (rms) acceleration magnitudes and frequencies of vibration: 5 m/s2 at 31.5 Hz, 10 m/s2 at 63 Hz, 20 m/s2 at 125 Hz, 40 m/s2 at 250 Hz, and 50 m/s2 at 315 Hz. According to international standard ISO 5349, these vibration levels generate the same frequency-weighted acceleration magnitude of 2.5 m/s2 rms. A control condition consisted of grasping a handle without vibration. As the index of the activated central nervous system, plasma 3-methoxy-4-hydroxyphenylglycol (MHPG) was measured before and immediately after each vibration exposure.
  
  
  RESULTS
  Each condition of vibration induced a palmar sweating response. Among the six vibration conditions, vibration of 125 Hz and 63 Hz caused large palmar sweating responses compared with those of 315 Hz andthe control condition. Plasma MHPG did not increase significantly after either vibrationexposure.
  
  
  CONCLUSIONS
  The palmar sweating response to vibration with the same frequency-weightedacceleration magnitude suggested dependency on frequency. The study suggests that the somatosympathetic reflex is associated with different palmar sweating responses.
authors.affiliation: Department of Environmental Medicine, Kurume University School of Medicine, Japan. hando@med.kurume-u.ac.jp
authors.forename: Hideo
authors.initials: H
authors.lastname: Ando
authors.forename: Ryo
authors.initials: R
authors.lastname: Noguchi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ishitake
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001132:Arm; D006225:Hand / Q000502:physiology*; D006801:Humans; D008297:Male; D016273:Occupational Exposure / Q000009:adverse effects*; D013546:Sweating / Q000502:physiology*; D014732:Vibration / Q000009:adverse effects*