Pilocarpine-induced sweat gland function in individuals with multiple sclerosis

Scott L. Davis, Thad E. Wilson, Jamie M. Vener, Craig G. Crandall, Jack H. Petajan, Andrea T. White

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

This investigation tested the hypothesis that cholinergic sweat function of individuals with multiple sclerosis (MS) (MS-Con; n = 10) is diminished relative to matched healthy control subjects (Con; n = 10). In addition, cholinergic sweat function was determined before and after 15 wk of aerobic training in a subgroup of individuals with MS (MS-Ex; n = 7). Cholinergic sweating responses were assessed via pilocarpine iontophoresis on ventral forearm skin. A collection disk placed over the stimulated area collected sweat for 15 min. Sweat rate (SR) was calculated by dividing sweat collector volume by collection area and time. Iodine-treated paper was applied to the stimulated area to measure number of activated sweat glands (ASG). Sweat gland output (SGO) was calculated by dividing SR by density of glands under the collector. Sweat gland function was determined in MS-Ex to test the hypothesis that exercise training would increase sweating responses. No differences in ASG were observed between MS-Con and Con. SR and SGO in MS-Con [0.18 mg·cm -2·min-1 (SD 0.08); 1.74 μg·gland -1·min-1 (SD 0.79), respectively] were significantly lower (P ≤ 0.05) than in Con [0.27 mg·cm -2·min-1 (SD 0.10); 2.43 μg·gland -1·min-1 (SD 0.69)]. Aerobic exercise training significantly (P ≤ 0.05) increased peak aerobic capacity in MS-Ex [1.86 (SD 0.75) vs. 2.10 (SD 0.67) 1/min] with no changes in ASG, SR, and SGO. Sweat gland function in individuals with MS is impaired relative to healthy controls. Fifteen weeks of aerobic-training did not increase stimulated sweating responses in individuals with MS. Diminished peripheral sweating responses may be a consequence of impairments in autonomic control of sudomotor function.

Original languageEnglish (US)
Pages (from-to)1740-1744
Number of pages5
JournalJournal of Applied Physiology
Volume98
Issue number5
DOIs
StatePublished - May 2005

Fingerprint

Sweat Glands
Pilocarpine
Sweat
Multiple Sclerosis
Sweating
Cholinergic Agents
Exercise
Iontophoresis
Forearm
Iodine
Healthy Volunteers

Keywords

  • Demyelination
  • Sudomotor
  • Sweat gland density
  • Sweat rate

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Pilocarpine-induced sweat gland function in individuals with multiple sclerosis. / Davis, Scott L.; Wilson, Thad E.; Vener, Jamie M.; Crandall, Craig G.; Petajan, Jack H.; White, Andrea T.

In: Journal of Applied Physiology, Vol. 98, No. 5, 05.2005, p. 1740-1744.

Research output: Contribution to journalArticle

Davis, Scott L. ; Wilson, Thad E. ; Vener, Jamie M. ; Crandall, Craig G. ; Petajan, Jack H. ; White, Andrea T. / Pilocarpine-induced sweat gland function in individuals with multiple sclerosis. In: Journal of Applied Physiology. 2005 ; Vol. 98, No. 5. pp. 1740-1744.
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