The effects of hypohydration and fatigue on neuromuscular activation performance

Claire Minshull*, Lewis James

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigated the effects of hypohydration by fluid restriction on voluntary and evoked indices of neuromuscular performance at a functional joint angle. Measures of static volitional peak force (2-3-s maximal muscle actions) and evoked peak twitch force, electromechanical delay, and rate of force development were obtained from the knee extensors (30 degrees knee flexion) of 10 males (age, 24 (4) years; height, 1.76 (0.10) m; body mass, 78.7 (9.13) kg (mean (SD))) prior to and immediately following 24 h of (i) euhydration (EU) and (ii) hypohydration (HYP). Neuromuscular performance was also assessed in response to a fatiguing task (3 x 30-s maximal static knee extensions) following each condition. Repeated-measures ANOVAs showed that HYP was associated with a significant 2.1% loss in body mass (p <0.001) and a 7.8% reduction in volitional peak force (p <0.05). Following fatigue, data indicated statistically similar levels of impairment to volitional peak force (11.6%, p <0.01) and rate of force development (21.0%, p <0.01) between conditions (EU; HYP). No changes to any other indices of performance were observed. The substantive hypohydration-induced deficits to muscle strength at this functional joint angle might convey a decreased performance capability and should be considered by the hypohydrated athlete. Whilst hypohydration did not affect fatigue-related performance of the knee extensors, the additive changes associated with lower baseline levels of strength performance (7.8%) and fatigue (11.6%) coupled with slower rate of muscle force production (from 0-100 ms) following fatigue may present significant challenges to the maintenance of dynamic knee joint stability, particularly at this vulnerable joint position.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalApplied Physiology, Nutrition, and Metabolism
Volume38
Issue number1
DOIs
Publication statusPublished - Jan 2013

Keywords

  • dehydration
  • electromechanical delay
  • fatigue
  • magnetic stimulation
  • strength
  • rate of force development
  • ANTERIOR CRUCIATE LIGAMENT
  • SKELETAL-MUSCLE
  • ELECTROMECHANICAL DELAY
  • MODERATE DEHYDRATION
  • MUSCULAR STRENGTH
  • ENDURANCE
  • HYDRATION
  • EXERCISE
  • STIMULATION
  • INTENSITY

Fingerprint

Dive into the research topics of 'The effects of hypohydration and fatigue on neuromuscular activation performance'. Together they form a unique fingerprint.

Cite this