Between-day reliability of upper extremity H-reflexes

Ann Marie Stowe, Laura Hughes-Zahner, Antonis Pantakis Stylianou, Sheila Schindler-Ivens, Barbara Marie Quaney

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


H-reflexes are useful for evaluating the group Ia monosynaptic reflex excitability in the lower and upper extremities (UEs). However, there is no established between-day protocol for measuring H-reflex excitability in the UE extensor carpi radialis longus (ECRL). The purpose of this study was to develop a reliable protocol to measure the H-reflex excitability between-days for the ECRL, and the antagonist muscle, the flexor carpi radialis (FCR). H-reflex recruitment curves were recorded from eight healthy young subjects over 3 consecutive days in both muscles. Variables associated with the H-reflex excitability were measured: (a) maximum amplitude (Hmax); (b) gain (HGN); (c) threshold (HTH, visHTH, and sdHTH). All variables were normalized with respect to the M-wave. Within individual muscles, there were no statistically significant differences between-days for the group (p > 0.05) and variables showed fair to good reliability (ICC = 0.57-0.99). This method of reliably measuring H-reflex excitability within UE muscles will be useful for investigating the effects of pathology and rehabilitation on monosynaptic reflexes.

Original languageEnglish (US)
Pages (from-to)317-323
Number of pages7
JournalJournal of Neuroscience Methods
Issue number2
StatePublished - May 30 2008


  • Between-day reliability
  • H-reflex
  • Healthy adults
  • Upper extremity

ASJC Scopus subject areas

  • General Neuroscience


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