The Effect of Teeth Clenching on Dynamic Balance at Jump-Landing: A Pilot Study

Nakamura, Tomomasa; Yoshida, Yuriko; Churei, Hiroshi; Aizawa, Junya; Hirohata, Kenji; Ohmi, Takehiro; Ohji, Shunsuke; Takahashi, Toshiyuki; Enomoto, Mitsuhiro; Ueno, Toshiaki; Yagishita, Kazuyoshi

doi:10.1123/jab.2016-0137

Cited by 2 publications

(2 citation statements)

References 32 publications

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Hirabayashi et alT eeth clenching has a significant immediate impact on exercise performance, 5,10,35 but the optimal clenching strength for peak performance during various exercises is unknown. Clenching has been observed with strenuous exercise, such as sports, and its effects on exercise and muscle performance have been reported.

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confidence: 99%

Effects of Clenching Strength on Exercise Performance: Verification Using Spinal Function Assessments

et al. 2021

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Background: This study aimed to determine the relationship between exercise performance and spinal function based on clenching strength. Hypothesis: Low-intensity clenching contributes to joint movement, whereas high-intensity clenching contributes to joint fixation. Study Design: Randomized crossover trial. Level of Evidence: Level 3. Methods: Two experiments were conducted using 2 groups of 20 healthy adults. The 4 clenching conditions in experiment 1 were 0%, 12.5%, 25%, and 50% of the maximum voluntary contraction (MVC) of the masseter muscle. Experiment 2 consisted of 3 conditions: no-bite condition, moderate effort, and maximum effort (max condition). In experiment 1, spinal function and ankle dorsiflexion tasks were measured for each clenching condition, and the ankle dorsiflexion task was measured in experiment 2. Regarding spinal function, we measured spinal reciprocal inhibition (RI) and excitability of spinal anterior horn cells. For the ankle dorsiflexion task, ankle dorsiflexion MVC was performed for 3 seconds under each clenching condition. The items analyzed were reaction time, peak ankle dorsiflexion torque, and soleus (Sol)/tibialis anterior (TA) electromyography (EMG) ratio. Results: The results of experiment 1 illustrated that RI was significantly attenuated or eliminated with increasing clenching strength (>25% MVC). Spinal anterior horn cell excitability increased significantly with increasing clenching strength. The peak torque was significantly higher at 50% MVC than that at 0% MVC. In experiment 2, the peak torque was significantly higher under moderate and max conditions than no-bite condition, and the Sol/TA EMG ratio was significantly higher under max condition than that under moderate condition. Conclusion/Clinical Relevance: The results illustrated that during high-strength clenching (≥50% MVC), antagonist muscles are activated simultaneously to increase muscle strength. High-strength clenching improved kinetic performance (joint fixation), whereas low-strength clenching (<50% MVC) enhanced exercise performance (joint movement).

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Effects of Clenching Strength on Exercise Performance: Verification Using Spinal Function Assessments

et al. 2021

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“…However, using a stabilometric platform, a prior study has reported that dental occlusion does not influence postural stability in static body balance [22]. There was no significant difference in dynamic body balance between pre-teeth clenching and post-teeth clenching interventions during jump-landing motions [11]. Some studies reported that an MG did not significantly affect the maximum exercise performance of athletes from a subjective point of view, such as numeric scores of the athletes' assessments of mouth guard interference.…”

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Development of a Wearable Mouth Guard Device for Monitoring Teeth Clenching during Exercise

Kinjo

Wada

Churei

et al. 2021

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Teeth clenching during exercise is important for sports performance and health. Recently, several mouth guard (MG)-type wearable devices for exercise were studied because they do not disrupt the exercise. In this study, we developed a wearable MG device with force sensors on both sides of the maxillary first molars to monitor teeth clenching. The force sensor output increased linearly up to 70 N. In four simple occlusion tests, the trends exhibited by the outputs of the MG sensor were consistent with those of an electromyogram (EMG), and the MG device featured sufficient temporal resolution to measure the timing of teeth clenching. When the jaw moved, the MG sensor outputs depended on the sensor position. The MG sensor output from the teeth-grinding test agreed with the video-motion analysis results. It was comparatively difficult to use the EMG because it contained a significant noise level. Finally, the usefulness of the MG sensor was confirmed through an exercise tolerance test. This study indicated that the developed wearable MG device is useful for monitoring clenching timing and duration, and the degree of clenching during exercise, which can contribute to explaining the relationship between teeth clenching and sports performance.

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The Effect of Teeth Clenching on Dynamic Balance at Jump-Landing: A Pilot Study

Cited by 2 publications

References 32 publications

Effects of Clenching Strength on Exercise Performance: Verification Using Spinal Function Assessments

Effects of Clenching Strength on Exercise Performance: Verification Using Spinal Function Assessments

Development of a Wearable Mouth Guard Device for Monitoring Teeth Clenching during Exercise

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