Topical Analgesics and Blood Pressure during Static Contraction in Humans

Alison N. Dawson, Buddy Walser, Mehrdad Jafarzadeh, Charles L Stebbins

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Purpose: In decerebrate cats, topical application of analgesic balm (AB) can attenuate the pressor response to electrically induced static contraction. We examined the possibility that this phenomenon also occurs in humans and determined whether such effects were limited to a local action on the contracting muscle (e.g., attenuations of the action of groups III and IV muscle afferents that cause the exercise pressor reflex) or whether they also may have affected active muscle blood flow and/or central command. Methods: Blood pressure (mean arterial pressure (MAP)), heart rate (HR), brachial artery blood flow (BABF), and relative perceived exertion (RPE) were assessed at rest and during 90 s of static handgrip contraction before and 50 min after application of a commercially available AB (1% capsaicin, 12.5% methyl salicylate) to the skin of the forearm muscles. Results: AB attenuated the MAP response to contraction (19 ± 3 vs 27 ± 5 mm Hg) but had no effect on the HR response. Absolute BABF was enhanced at rest and during contraction, but absolute (118 ± 47 vs 114 ± 47 mL·min -1) and percent increases (83 ± 31 vs 55 ± 19%) were not statistically different between conditions. AB appeared to slightly enhance RPE, but this was also the case in a control protocol where only the vehicle (petroleum jelly) was used and no change in the blood pressure response was seen. Conclusions: AB attenuates contraction-induced increases in MAP that do not seem to be related to alterations in perfusion of active muscle or central command. Effects appear to be localized to the active skeletal muscle and likely involve reductions in sensitivity of groups III and IV muscle afferents to local chemical and/or mechanical stimulation.

Original languageEnglish (US)
Pages (from-to)632-638
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume36
Issue number4
DOIs
StatePublished - Apr 2004

Keywords

  • Brachial artery blood flow
  • Capsaicin
  • Heart rate
  • Methyl salicylate
  • Relative perceived exertion

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine

Fingerprint Dive into the research topics of 'Topical Analgesics and Blood Pressure during Static Contraction in Humans'. Together they form a unique fingerprint.

  • Cite this