The Effect of Magnesium Carbonate (Chalk) on Geometric Entropy, Force, and Electromyography during Rock Climbing

Matthew A. Kilgas, Scott N. Drum, Randall L. Jensen, Kevin C. Phillips, Phillip B. Watts

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Rock climbers believe chalk dries the hands of sweat and improves the static coefficient of friction between the hands and the surface of the rock. The purpose of this study was to assess whether chalk affects geometric entropy or muscular activity during rock climbing. Nineteen experienced recreational rock climbers (13 males, 6 females; 173.5 ± 7.0 cm; 67.5 ± 3.4 kg) completed 2 climbing trails with and without chalk. The body position of the climber and muscular activity of the finger flexors was recorded throughout the trial. Following the movement sequence participants hung from a standard climbing hold until they slipped from the climbing structure, while the coefficient of friction and the ratio of the vertical forces on the hands and feet were determined. Although there were no differences in the coefficient of friction (P = .748), geometric entropy (P = .359), the ratio of the vertical forces between the hands and feet (P = .570), or muscular activity (P = .968), participants were able to hang longer after the use of chalk 62.9 ± 36.7 s and 49.3 ± 25.2 s (P = .046). This is advantageous because it may allow for prolonged rests, and more time to plan the next series of climbing moves.

Original languageEnglish (US)
Pages (from-to)553-557
Number of pages5
JournalJournal of Applied Biomechanics
Volume32
Issue number6
DOIs
StatePublished - Dec 2016
Externally publishedYes

Keywords

  • Body position
  • Bouldering
  • Friction
  • Hang time
  • Moisture

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

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