Analysis of Temporalis and Masseter adaptation after routine dental treatment in the horse via surface electromyography

Jane Williams, C. Johnson, R. Bales, G. Lloyd, D. Quest

    Research output: Contribution to journalJournal Article

    9 Citations (Scopus)

    Abstract

    Limited knowledge of how routine dental treatment (rasping) alters the mastication cycle exists. To our knowledge, Masseter and Temporalis muscle activity after rasping has not been previously evaluated. A descriptive, experimental study compared muscle activity pre- and post-routine dental treatment using surface electromyography (sEMG) to investigate the hypothesis that Masseter activity would increase and Temporalis activity decrease, over a 6 week time period after routine dentistry. Motor unit action potential amplitude (MUAP) and peak amplitude contraction (PAC), for 5 chewing cycles, were measured using sEMG in the right and left Masseter and Temporalis muscles of 10 horses, selected opportunistically due to their dental pathology that required routine rasping (week 0). Routine dental treatment was undertaken and sEMG measurements repeated at 1, 3 and 6 weeks post treatment. Mean MUAP and PAC were calculated for each week and compared both across the cohort and for each horse. For the cohort: Temporalis MUAP fluctuated after rasping, but was only significant in the left muscle between weeks 0 and 6, and weeks 1 and 6 (P<0.02). PAC did not differ significantly, with the exception of a decrease occurring on the left from week 0 to 1 (P<0.01). Masseter activity varied throughout the investigation, but few significant differences were found. A non-significant but consistent reduction in magnitude of PAC was found. For the individuals: MUAP and PAC in the Masseter and Temporalis muscles varied (increased / decreased) on an individual basis throughout the six weeks post rasping, although only MUAP fluctuations between weeks were significant (P<0.01). Adaptation occurs in the Masseter and Temporalis of individual horses after routine rasping; this appears to be associated with kinematic changes within the chewing cycle and is still occurring 6 weeks post-treatment.
    Original languageEnglish
    Pages (from-to)223-232
    Number of pages9
    JournalComparative Exercise Physiology
    Volume4
    Issue number4
    DOIs
    Publication statusPublished - Dec 2014

    Fingerprint

    Electromyography
    electromyography
    action potentials
    Action Potentials
    Horses
    Muscle
    Mastication
    Tooth
    teeth
    Masseter Muscle
    horses
    mastication
    muscles
    dentistry
    Dentistry
    Muscles
    Pathology
    kinematics
    Biomechanical Phenomena
    Surface treatment

    Cite this

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    title = "Analysis of Temporalis and Masseter adaptation after routine dental treatment in the horse via surface electromyography",
    abstract = "Limited knowledge of how routine dental treatment (rasping) alters the mastication cycle exists. To our knowledge, Masseter and Temporalis muscle activity after rasping has not been previously evaluated. A descriptive, experimental study compared muscle activity pre- and post-routine dental treatment using surface electromyography (sEMG) to investigate the hypothesis that Masseter activity would increase and Temporalis activity decrease, over a 6 week time period after routine dentistry. Motor unit action potential amplitude (MUAP) and peak amplitude contraction (PAC), for 5 chewing cycles, were measured using sEMG in the right and left Masseter and Temporalis muscles of 10 horses, selected opportunistically due to their dental pathology that required routine rasping (week 0). Routine dental treatment was undertaken and sEMG measurements repeated at 1, 3 and 6 weeks post treatment. Mean MUAP and PAC were calculated for each week and compared both across the cohort and for each horse. For the cohort: Temporalis MUAP fluctuated after rasping, but was only significant in the left muscle between weeks 0 and 6, and weeks 1 and 6 (P<0.02). PAC did not differ significantly, with the exception of a decrease occurring on the left from week 0 to 1 (P<0.01). Masseter activity varied throughout the investigation, but few significant differences were found. A non-significant but consistent reduction in magnitude of PAC was found. For the individuals: MUAP and PAC in the Masseter and Temporalis muscles varied (increased / decreased) on an individual basis throughout the six weeks post rasping, although only MUAP fluctuations between weeks were significant (P<0.01). Adaptation occurs in the Masseter and Temporalis of individual horses after routine rasping; this appears to be associated with kinematic changes within the chewing cycle and is still occurring 6 weeks post-treatment.",
    author = "Jane Williams and C. Johnson and R. Bales and G. Lloyd and D. Quest",
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    language = "English",
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    Analysis of Temporalis and Masseter adaptation after routine dental treatment in the horse via surface electromyography. / Williams, Jane; Johnson, C.; Bales, R.; Lloyd, G.; Quest, D.

    In: Comparative Exercise Physiology, Vol. 4, No. 4, 12.2014, p. 223-232.

    Research output: Contribution to journalJournal Article

    TY - JOUR

    T1 - Analysis of Temporalis and Masseter adaptation after routine dental treatment in the horse via surface electromyography

    AU - Williams, Jane

    AU - Johnson, C.

    AU - Bales, R.

    AU - Lloyd, G.

    AU - Quest, D.

    PY - 2014/12

    Y1 - 2014/12

    N2 - Limited knowledge of how routine dental treatment (rasping) alters the mastication cycle exists. To our knowledge, Masseter and Temporalis muscle activity after rasping has not been previously evaluated. A descriptive, experimental study compared muscle activity pre- and post-routine dental treatment using surface electromyography (sEMG) to investigate the hypothesis that Masseter activity would increase and Temporalis activity decrease, over a 6 week time period after routine dentistry. Motor unit action potential amplitude (MUAP) and peak amplitude contraction (PAC), for 5 chewing cycles, were measured using sEMG in the right and left Masseter and Temporalis muscles of 10 horses, selected opportunistically due to their dental pathology that required routine rasping (week 0). Routine dental treatment was undertaken and sEMG measurements repeated at 1, 3 and 6 weeks post treatment. Mean MUAP and PAC were calculated for each week and compared both across the cohort and for each horse. For the cohort: Temporalis MUAP fluctuated after rasping, but was only significant in the left muscle between weeks 0 and 6, and weeks 1 and 6 (P<0.02). PAC did not differ significantly, with the exception of a decrease occurring on the left from week 0 to 1 (P<0.01). Masseter activity varied throughout the investigation, but few significant differences were found. A non-significant but consistent reduction in magnitude of PAC was found. For the individuals: MUAP and PAC in the Masseter and Temporalis muscles varied (increased / decreased) on an individual basis throughout the six weeks post rasping, although only MUAP fluctuations between weeks were significant (P<0.01). Adaptation occurs in the Masseter and Temporalis of individual horses after routine rasping; this appears to be associated with kinematic changes within the chewing cycle and is still occurring 6 weeks post-treatment.

    AB - Limited knowledge of how routine dental treatment (rasping) alters the mastication cycle exists. To our knowledge, Masseter and Temporalis muscle activity after rasping has not been previously evaluated. A descriptive, experimental study compared muscle activity pre- and post-routine dental treatment using surface electromyography (sEMG) to investigate the hypothesis that Masseter activity would increase and Temporalis activity decrease, over a 6 week time period after routine dentistry. Motor unit action potential amplitude (MUAP) and peak amplitude contraction (PAC), for 5 chewing cycles, were measured using sEMG in the right and left Masseter and Temporalis muscles of 10 horses, selected opportunistically due to their dental pathology that required routine rasping (week 0). Routine dental treatment was undertaken and sEMG measurements repeated at 1, 3 and 6 weeks post treatment. Mean MUAP and PAC were calculated for each week and compared both across the cohort and for each horse. For the cohort: Temporalis MUAP fluctuated after rasping, but was only significant in the left muscle between weeks 0 and 6, and weeks 1 and 6 (P<0.02). PAC did not differ significantly, with the exception of a decrease occurring on the left from week 0 to 1 (P<0.01). Masseter activity varied throughout the investigation, but few significant differences were found. A non-significant but consistent reduction in magnitude of PAC was found. For the individuals: MUAP and PAC in the Masseter and Temporalis muscles varied (increased / decreased) on an individual basis throughout the six weeks post rasping, although only MUAP fluctuations between weeks were significant (P<0.01). Adaptation occurs in the Masseter and Temporalis of individual horses after routine rasping; this appears to be associated with kinematic changes within the chewing cycle and is still occurring 6 weeks post-treatment.

    U2 - 10.3920/CEP143004

    DO - 10.3920/CEP143004

    M3 - Journal Article

    VL - 4

    SP - 223

    EP - 232

    JO - Comparative Exercise Physiology

    JF - Comparative Exercise Physiology

    SN - 1755-2540

    IS - 4

    ER -