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Associations among masticatory muscle activity, physical activity and self-reported oral behaviours in adult women

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Abstract

Objectives

To examine the relationship between masticatory muscle activity (MMA), self-reported oral behaviours (OBs) and overall physical activity (PA) in adult women.

Materials and methods

MMA and PA were assessed by a wearable electromyography (EMG) device and accelerometer respectively, worn over 2 non-consecutive days by 53 women (mean age 27.5 ± 6.4 years). Following the second recording day, self-reported OBs were assessed. MMA was assessed by the number, amplitude and duration of masseter contraction episodes. Masseter muscle EMG outcome measures were number of contraction episodes per hour (CEs/h) and the relative contraction time (RCT%). PA was assessed by time accumulated in moderate to vigorous physical activity (MVPA) and 10-min bouts of MVPA per hour. Data were analysed using mixed model analysis.

Results

MMA in free-living conditions consisted mostly of low-amplitude (<10% maximum voluntary clenching) and short-duration (<10 s) contraction episodes. Masseter CEs/h were not associated with self-reported levels of OB. Masseter CEs/h were positively associated with time accumulated in MVPA (F = 9.9; p = 0.002) and negatively associated with 10-min bouts of MVPA/h (F = 15.8; p <0.001). RCT% was not significantly associated with either.

Conclusions

Objectively assessed MMA is not associated with self-reported OB in free-moving adult females. Moderate to vigorous exercise and physical inactivity are accompanied with an increase in the number of masseter muscle contractions and thus possibly tooth clenching activity.

Clinical relevance

OB can be influenced by the type and extent of PA. Subjective assessment of MMA by questionnaire and/or interviews may be invalid.

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Acknowledgements

We would like to thank engineers Max Farr, Max Allen, Kuang Ma and Edwin Neiman from Kamahi Electronics, Dunedin for their support with the equipment used in this study. We also like to thank the students from the University of Otago for volunteering to participate in the research.

Funding

This study was supported with funding from the New Zealand Dental Association and Pain@Otago research grants.

Author information

Authors and Affiliations

  1. Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand

    Sabarinath Prasad, Richard D. Cannon & Mauro Farella

  2. Department of Orthodontics, University of Otago, Dunedin, New Zealand

    Divya Ramanan

  3. Department of Computer Science, University of Otago, Dunedin, New Zealand

    Hamza Bennani

  4. Department of Zoology, University of Otago, Dunedin, New Zealand

    Michael Paulin

  5. University of Zürich, Zürich, Switzerland

    Sandro Palla

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  1. Sabarinath Prasad
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  2. Divya Ramanan
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  3. Hamza Bennani
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  4. Michael Paulin
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  5. Richard D. Cannon
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  6. Sandro Palla
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  7. Mauro Farella
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Correspondence to Sabarinath Prasad.

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All procedures performed in the human participants were in accordance with the ethical standards of the institution and approval was obtained (H16/125).

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Informed consent was obtained from all individual participants included in the study.

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Prasad, S., Ramanan, D., Bennani, H. et al. Associations among masticatory muscle activity, physical activity and self-reported oral behaviours in adult women. Clin Oral Invest 25, 5049–5059 (2021). https://doi.org/10.1007/s00784-021-03816-9

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