Cervical flexion-relaxation response to neck muscle fatigue in males and females

Ashish D. Nimbarte, Majed M. Zreiqat, Suman Kanti Chowdhury

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


In this study the effect of muscle fatigue on the cervical spine flexion-relaxation response was studied. Twenty healthy participants (10 males and 10 females) were recruited for data collection. The Sorenson protocol was utilized to induce neck muscle fatigue. Surface electromyography and optical motion capture systems were used to measure neck muscle activation and head-neck posture, respectively. A post-fatigue reduction in the Flexion-Relaxation Ratio (FRR) and higher FRR for females compared to males were observed. A post-fatigue decrease was also observed in the onset and offset angles resulting in an expansion of the myoelectric silence period. Gender had no effect on the onset and offset angles of the silence period. Post-fatigue shift in the onset and offset angles and the expansion of the silence period indicate an increased contribution by the passive viscoelastic tissues in stabilizing the cervical spine under fatigued condition.

Original languageEnglish
Pages (from-to)965-971
Number of pages7
JournalJournal of Electromyography and Kinesiology
Issue number6
StatePublished - Dec 1 2014


  • Cervical spine
  • Fatigue
  • Flexion-relaxation phenomenon
  • Gender


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