Pain sensitivity after low-level clenching is influenced by preloading eccentric exercise

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  • Yuichi Tanabe, Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-7-1, Nagasaki, 852-8501, Japan., Japan
  • Tetsurou Torisu, Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-7-1, Nagasaki, 852-8501, Japan., Japan
  • Hiroaki Tada, Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-7-1, Nagasaki, 852-8501, Japan., Japan
  • Erika Yamaguchi, Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-7-1, Nagasaki, 852-8501, Japan., Japan
  • Hiroshi Murata, Department of Prosthetic Dentistry, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-7-1, Nagasaki, 852-8501, Japan., Japan
  • Antoon De Laat, Department of Oral Health Sciences, KU Leuven, Leuven, Belgium., Dentistry, University Hospitals Leuven, Kapucijnenvoer, 3000, Leuven, Belgium., Belgium
  • Peter Svensson

PURPOSE: To examine the effect of preloading eccentric exercise on pain sensitivity in healthy volunteers.

METHODS: In 20 healthy volunteers, pain-related sensations (6 items: pain, unpleasantness, fatigue, stiffness, tension, and soreness during maximum biting), and pain intensities induced by repeated electrical stimuli on the masseter and the hand palm were evaluated using a visual analog scale (VAS) of 0-100 mm. Eccentric exercise (6 min-test) or gum chewing (6 min-control) was used as preloading exercise to evaluate the effect on pain sensitivities before and after low-level clenching (15 min) performed 2 days after the preloading exercise.

RESULTS: Eccentric exercise induced only low levels of pain-related sensations 2 days later. However, the time course of temporal summation induced by four repeated electrical stimuli on the masseter was influenced by the type of preloading exercise, i.e., temporal summation increased after the low-level clenching (P = 0.016) when preloading was done by the eccentric exercise, while no significant change was observed when preloading was done by the gum chewing.

CONCLUSIONS: Eccentric exercise may facilitate pain sensitivity induced by subsequent low-level clenching via the central nervous system. In addition, it was demonstrated that pain sensitivity after the low-level clenching could be influenced by the type of preloading exercise. These experimental results may suggest that eccentric exercise could act as one of the triggering factors in the mechanism by which tooth clenching leads to a chronic pain condition in susceptible individuals.

Original languageEnglish
JournalOdontology: Official Journal of the Society of the Nippon Dental University
Volume109
Issue1
Pages (from-to)29-40
Number of pages12
ISSN1618-1247
DOIs
Publication statusPublished - Jan 2021

    Research areas

  • ADAPTATION, Chronic pain, DAMAGE, HYPERALGESIA, INJURY, MECHANISMS, Masticatory muscles, Myalgia, ONSET MUSCLE SORENESS, RISK, TEMPORAL SUMMATION, Temporal summation, Temporomandibular joint disorders

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