Significant change in muscular strength based on the head and neck position

Janis Vētra, Vladimirs Skļarevičs, Gregory Anoufriev, Imants Kalninš, Silvija Umbraško, Jānis Vētra Jr, Vladislavs Kotovs, Larisa Beilina

Research output: Contribution to journalArticlepeer-review


We present our study of the influence of the head 30 degrees flexion position on the changes in the muscle strength of the upper extremities. This position is typical for a person working in front of a computer.The study involved 100 healthy volunteers and was performed at the Department of Morphology in Riga Stradiņš University, Riga, Latvia. For measurements we have used the MicroFET2 Hand Held Digital Muscle Tester to determine the strength of the muscles of the hand and the arm (M. del-toideus, M. biceps brachii, M. triceps brachii, M. abductor pollicis longus). The results of measurements were then used to analyze the difference in the strength of the muscles innervated by the spinal cord cervical region (C5–C8 nerves)for the same person sitting in the vertical position and sitting with the head flexed at 30°. The results of our study support the hypothesis that the changes in the strength of the measured muscles are related to the mechanical distension of the spinal cord, which leads to changes in spinal cord’s blood supply. The kyphosis position of the cervical spine during head flexion at 30°extent shows that in the spinal cord segments C5, C6 and C7 are form mechanical distension, but the changes in segment C8 were not detectable. Using our statistical study, we can conclude that there is strong relation-ship in the strength change in most of the observed muscles between the vertical position and the flexion of head at 30 degrees.
Original languageEnglish
Pages (from-to)115-125
JournalPapers on Anthropology
Issue number1
Publication statusPublished - 4 Jul 2017


  • muscle strength of the upper extremities
  • spinal cord
  • cervical region flexion
  • work environment

Field of Science*

  • 2.6 Medical engineering
  • 3.1 Basic medicine

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database


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