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<p>This study examined how different mandibular positions affect the neuromuscular activity of the upper trapezius muscle (descending part of trapezius muscle; M.&#xa0;trapezius pars descendens) in 20&#xa0;healthy male handball players. Four occlusal conditions were tested: habitual occlusion, maximum intercuspation, occlusal disengagement using an Aqualizer, and an individually fabricated splint in centric condylar relation. Muscle activity was recorded by surface electromyography during a&#xa0;standardized maximal isometric shoulder press task. The results indicate that mandibular position influences trapezius muscle activation. The highest activity was observed in habitual occlusion and especially in centric condylar relation, whereas the lowest values occurred during occlusal disengagement with the Aqualizer. Significant differences were mainly found in the left trapezius muscle. This is primarily due to functional connections between the craniomandibular system, the cervical spine and the postural muscles. The study suggests that individually customized splints may enhance neuromuscular recruitment and potentially support performance-related functions, whereas non-specific occlusal interventions may reduce muscular activation. However, because of the small sample size and the inclusion of only young male athletes, further research is needed to confirm and expand these findings.</p>

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Einfluss der Unterkieferposition auf die neuromuskuläre Aktivität der oberen Rückenmuskulatur

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Nicolas Plein,
  • Babak Sayahpour,
  • Sarah Bühling,
  • Stefan Kopp

摘要

This study examined how different mandibular positions affect the neuromuscular activity of the upper trapezius muscle (descending part of trapezius muscle; M. trapezius pars descendens) in 20 healthy male handball players. Four occlusal conditions were tested: habitual occlusion, maximum intercuspation, occlusal disengagement using an Aqualizer, and an individually fabricated splint in centric condylar relation. Muscle activity was recorded by surface electromyography during a standardized maximal isometric shoulder press task. The results indicate that mandibular position influences trapezius muscle activation. The highest activity was observed in habitual occlusion and especially in centric condylar relation, whereas the lowest values occurred during occlusal disengagement with the Aqualizer. Significant differences were mainly found in the left trapezius muscle. This is primarily due to functional connections between the craniomandibular system, the cervical spine and the postural muscles. The study suggests that individually customized splints may enhance neuromuscular recruitment and potentially support performance-related functions, whereas non-specific occlusal interventions may reduce muscular activation. However, because of the small sample size and the inclusion of only young male athletes, further research is needed to confirm and expand these findings.