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Related Experiment Video

Updated: Feb 11, 2026

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Chiropractic Manipulation Increases Maximal Bite Force in Healthy Individuals.

Heidi Haavik1, Mustafa Görkem Özyurt2, Imran Khan Niazi3,4,5

  • 1Centre for Chiropractic Research, New Zealand College of Chiropractic, 1060 Auckland, New Zealand. heidi.haavik@nzchiro.co.nz.

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|April 28, 2018
PubMed
Summary

Chiropractic spinal manipulation was found to significantly increase maximal bite force in a study involving 28 participants. This improvement in bite force was observed immediately after treatment and persisted for one week, suggesting a notable effect of chiropractic care.

Keywords:
chiropractic carespinal manipulationtotal maximal bite force

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Area of Science:

  • Neurology
  • Musculoskeletal Medicine
  • Biomechanical Engineering

Background:

  • Chiropractic spinal manipulation is known to affect sensorimotor integration and motor cortical drive.
  • Previous research has primarily focused on the limbs, leaving the influence on masticatory muscles unexplored.

Purpose of the Study:

  • To investigate the effect of chiropractic spinal manipulation on maximal bite force.
  • To determine if spinal manipulation influences the neuromuscular control of masticatory muscles.

Main Methods:

  • A randomized controlled trial with 28 participants, divided into a chiropractic care group and a sham chiropractic care group.
  • Maximal bite force was measured before and after the intervention, with a follow-up assessment at one week.
  • Participants were naive to chiropractic procedures to minimize bias.

Main Results:

  • The chiropractic group showed a significant increase in maximal bite force compared to the sham group post-intervention (p=0.02) and at the 1-week follow-up (p<0.01).
  • Bite force increased by 11.0% post-intervention (p=0.04) and 13.0% at follow-up (p=0.04) in the chiropractic group.
  • The control group exhibited no significant change immediately post-intervention (p=0.20) and a decrease at follow-up (p=0.01).

Conclusions:

  • Chiropractic spinal manipulation can lead to a significant increase in maximal bite force.
  • The findings suggest that spinal manipulation may enhance the motor control of muscles involved in biting.
  • Further research is warranted to elucidate the underlying neurophysiological mechanisms.