Time-Frequency Analysis of Chewing Activity in the Natural Environment

Abstract

The aim of this observational study was to investigate the features of the chewing activity and the variability of the human chewing pace, as assessed in the natural environment. It was hypothesized that the chewing pace is relatively constant within individuals across different days but is variable across individuals. Electromyographic surface activity was recorded unilaterally from the masseter in 21 participants for 3 hours over 3 recording days, in the natural environment, by means of portable recorders. The time-frequency properties of chewing activity were assessed with a previously validated algorithm. Repeated-measurements ANOVA was used for statistical analysis. Chewing activity mainly occurred in the range of 0.94 Hz (5^th percentile) and 2.17 Hz (95^th percentile). Mean and median chewing frequencies were 1.57 Hz and 1.58 Hz, respectively (95% confidence intervals: 1.45-1.68 Hz). The mean duration of chewing episodes was 13.0 sec, the 5^th and 95^th percentiles being 2.7 sec and 34.9 sec, respectively. Variability of the mean chewing frequency between individuals was much greater than that within individuals (F = 29.8; p < 0.001). The individual chewing paces were stable across different days (intraclass correlation coefficient = 0.88; 95% confidence intervals = 0.79-0.94). Our findings provide evidence that each individual, in the natural environment, chews with a consistent pace across different days.

Abbreviations: ANOVA, analysis of variance; CPG, central pattern generator; EMG, electromyography; ICC, Intra-class Correlation coefficient; SD, standard deviation.

Keywords

mastication chewing pace central pattern generator electromyography time-frequency analysis masseter muscle

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References

Bates

Stafford

Harrison

(1975). Masticatory function—a review of the literature: (II) Speed of movement of the mandible, rate of chewing and forces developed in chewing. J Oral Rehabil 2:349-361.

Blissett

Prinz

Wulfert

Taylor

Hort

(2007). Effect of bolus size on chewing, swallowing, oral soft tissue and tongue movement. J Oral Rehabil 34:572-582.

Dworkin

LeResche

(1992). Research diagnostic criteria for temporomandibular disorders: review, criteria, examinations and specifications, critique. J Craniomandib Disord 6:301-355.

Farella

Michelotti

Carbone

Gallo

Palla

Martina

(2005). Habitual daily masseter activity of subjects with different vertical craniofacial morphology. Eur J Oral Sci 113:380-385.

Farella

Palla

Gallo

(2009). Time-frequency analysis of rhythmic masticatory muscle activity. Muscle Nerve 39:828-836.

Foster

Woda

Peyron

(2006). Effect of texture of plastic and elastic model foods on the parameters of mastication. J Neurophysiol 95:3469-3479.

Gallo

Gross

Palla

(1999). Nocturnal masseter EMG activity of healthy subjects in a natural environment. J Dent Res 78:1436-1444.

Gerstner

Cianfarani

(1998). Temporal dynamics of human masticatory sequences. Physiol Behav 64:457-461.

Jemt

Hedegard

(1982). Reproducibility of chewing rhythm and of mandibular displacements during chewing. J Oral Rehabil 9:531-537.

10.

Kemsley

Defernez

Sprunt

Smith

(2003). Electromyographic responses to prescribed mastication. J Electromyogr Kinesiol 13:197-207.

11.

Kolta

Brocard

Verdier

Lund

(2007). A review of burst generation by trigeminal main sensory neurons. Arch Oral Biol 52:325-328.

12.

Lassauzay

Peyron

M-A

Albuisson

Dransfield

Woda

(2000). Variability of the masticatory process during chewing of elastic model foods. Eur J Oral Sci 108:484-492.

13.

Lavigne

Kim

Valiquette

Lund

(1987). Evidence that periodontal pressoreceptors provide positive feedback to jaw closing muscles during mastication. J Neurophysiol 58:342-358.

14.

Lund

(1991). Mastication and its control by the brain stem. Crit Rev Oral Biol Med 2:33-64.

15.

Lund

Kolta

(2006). Generation of the central masticatory pattern and its modification by sensory feedback. Dysphagia 21:167-174.

16.

Markiewicz

Ohrbach

McCall

(2006). Oral behaviors checklist: reliability of performance in targeted waking-state behaviors. J Orofac Pain 20:306-316.

17.

Morimoto

Inoue

Nakamura

Kawamura

(1984). Frequency-dependent modulation of rhythmic human jaw movements. J Dent Res 63:1310-1314.

18.

Nagasawa

Yanbin

Tsuga

Abe

(1997). Sex difference of electromyogram of masticatory muscles and mandibular movement during chewing of food. J Oral Rehabil 24:605-609.

19.

Nakamura

Katakura

(1995). Generation of masticatory rhythm in the brainstem. Neurosci Res 23:1-19.

20.

Onozuka

Fujita

Watanabe

Hirano

Niwa

Nishiyama

. (2002). Mapping brain region activity during chewing: a functional magnetic resonance imaging study. J Dent Res 81:743-746.

21.

Plesh

Bishop

McCall

(1986). Effect of gum hardness on chewing pattern. Exp Neurol 92:502-512.

22.

Plesh

Bishop

McCall

(1988). Comparison of automatic and voluntary chewing patterns and performance. Exp Neurol 99:326-341.

23.

Rau

Schulte

Disselhorst-Klug

(2004). From cell to movement: to what answers does EMG really contribute? J Electromyogr Kinesiol 14:611-617.

24.

Türker

(2002). Reflex control of human jaw muscles. Crit Rev Oral Biol Med 13:85-104.

25.

Van der Bilt

Weijnen

Ottenhoff

FAM

Van der Glas

Bosman

(1995). The role of sensory information in the control of rhythmic open-close movements in humans. J Dent Res 74:1658-1664.

26.

Van der Bilt

Engelen

Pereira

Van der Glas

Abbink

(2006). Oral physiology and mastication. Physiol Behav 89:22-27.

27.

Woda

Foster

Mishellany

Peyron

M-A

(2006a). Adaptation of healthy mastication to factors pertaining to the individual or to the food. Physiol Behav 89:28-35.

28.

Woda

Mishellany

Peyron

M-A

(2006b). The regulation of masticatory function and food bolus formation. J Oral Rehabil 33:840-849.

29.

Yamada

Yamamura

(1996). Possible factors which may affect phase durations in the natural chewing rhythm. Brain Res 706:237-242.

30.

Yamashita

Hatch

Rugh

(1999). Does chewing performance depend upon a specific masticatory pattern? J Oral Rehabil 26:547-553.

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