Is there an optimal ischemic-preconditioning dose to improve cycling performance?

Research output: Contribution to journalArticle

Authors

  • Scott Cocking
  • Mathew G. Wilson
  • David Nichols
  • Daniel J. Green
  • Dick H.J. Thijssen
  • Helen Jones

Colleges, School and Institutes

External organisations

  • Aspetar Orthopaedic and Sports Medicine Hospital
  • Department of Sports Science
  • Aspire Academy
  • Liverpool John Moores University

Abstract

Introduction: Ischemic preconditioning (IPC) may enhance endurance performance. No previous study has directly compared distinct IPC protocols for optimal benefit. Purpose: To determine whether a specific IPC protocol (ie, number of cycles, amount of muscle tissue, and local vs remote occlusion) elicits greater performance outcomes. Methods: Twelve cyclists performed 5 different IPC protocols 30 min before a blinded 375-kJ cycling time trial (TT) in a laboratory. Responses to traditional IPC (4 × 5-min legs) were compared with those to 8 × 5-min legs and sham (dose cycles), 4 × 5-min unilateral legs (dose tissue), and 4 × 5-min arms (remote). Rating of perceived exertion and blood lactate were recorded at each 25% TT completion. Power (W), heart rate (beats/min), and oxygen uptake (V O2) (mL kg-1 min-1) were measured continuously throughout TTs. Magnitudebased-inference statistics were employed to compare variable differences to the minimal practically important difference. Results: Traditional IPC was associated with a 17-s (0, 34) faster TT time than sham. Applying more dose cycles (8 × 5 min) had no impact on performance. Traditional IPC was associated with likely trivial higher blood lactate and possibly beneficial lower V O2 responses vs sham. Unilateral IPC was associated with 18-s (-11, 48) slower performance than bilateral (dose tissue). TT times after remote and local IPC were not different (0 [-16, 16] s). Conclusion: The traditional 4 × 5-min (local or remote) IPC stimulus resulted in the fastest TT time compared with sham; there was no benefit of applying a greater number of cycles or employing unilateral IPC.

Details

Original languageEnglish
Pages (from-to)274-282
Number of pages9
JournalInternational journal of sports physiology and performance
Volume13
Issue number3
Publication statusPublished - 1 Mar 2018

Keywords

  • Endurance, Exercise, Ischemia, Occlusion, Time trial

ASJC Scopus subject areas