Fatigue of Jaw Muscles and Speech Mechanisms

Miles, Timothy S.; Nordstrom, Michael A.

doi:10.1007/978-1-4899-1016-5_33

Cited by 6 publications

(4 citation statements)

References 52 publications

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“…5) could be due to loss of muscle fibres or to muscle fibre atrophv or, most probably, to a combination of these factors Interestingly, the decreases in area were greater in Volume 1. "^, No 1 Mibiccts without teeth, an observation consistent with the importance of stretch in maintaining iiuiscle pioicin synthesis and muscle mass (see below ) The most likely explanation lor the reduction in iiuiscle density to X-rays, also found by Newton ct al. *' (hig.…”

Section: Ageing Changes In Masticatory Musclessupporting

confidence: 66%

Oro‐facial muscles: internal structure, function and ageing

McComas

1998

Gerodontology

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Structure and function are reviewed in the masticatory muscles and in the muscles of the lower face and tongue. The enormous strength of jaw closure is in large part due to the pinnated arrangement of the muscle fibres in the masseter. This muscle, like other masticatory muscles, is unusual in that the cell bodies of the muscle spindle afferents lie in the brain stem rather than in an external ganglion; spindles are absent in the lower facial muscles. Although few data are available, the numbers of motor units in the masticatory muscles, and probably in the lower facial muscles also, appear to be much greater than in limb muscles. The motor units in the facial and tongue muscles are largely composed of histochemical type II ('fast-twitch') fibres, but in the masticatory muscles there are substantial numbers of fibres intermediate between type I ('slow twitch') and type II, and fibre type grouping is present. In comparison with limb muscles, there is little information on ageing changes in oro-facial muscles. The masticatory muscles do, however, show some atrophy and loss of X-ray density, while motor unit twitches are prolonged. Strength is reduced in the tongue and masticatory muscles. It is known that limb muscle properties are largely governed by their innervation, both through the pattern and amount of impulse activity, and the delivery of trophic messengers; the situation for oro-facial muscles is unclear. The structural and functional differences between the two types of muscle indicate the need for conducting ageing studies on the oro-facial muscles, rather than relying on extrapolations from limb muscles.

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Section: Ageing Changes In Masticatory Musclessupporting

confidence: 66%

Oro‐facial muscles: internal structure, function and ageing

McComas

1998

Gerodontology

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“…Also, regular muscle activities are characterized by rest periods between contractions, which allow muscle recovery and prevent muscle fatigue 35 . Additionally, masticatory muscles are originally resistant to fatigue 36 and the occurrence of muscle fatigue depends on the type, duration, and intensity of the exercise 29 . Eccentric muscle movements, which are infrequent in awake bruxism, were more associated with delayed onset of muscle soreness and participants showed increased fatigue levels 24 and 48 hours after experimental eccentric contractions.…”

Section: Discussionmentioning

confidence: 99%

Influence of awake bruxism behaviors on fatigue of the masticatory muscles in healthy young adults

et al. 2023

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The present cross-sectional study aimed to analyze the relationship between awake bruxism and fatigue of masticatory muscles in healthy young adults. For this purpose, 121 graduate students participated in this study. Frequency of awake bruxism was collected for 7 consecutive days by ecological momentary assessment (EMA) using an online survey (mentimeter). Muscle fatigue was tested one day after EMA assessment, which consisted of voluntarily and continuously clenching at 30% (kgf/cm 2 ) of maximum bite force (MBF) until exhaustion. The percentage of change in MBF after the clenching task, as compared to the MBF before the clenching task was measured. The average frequency of awake bruxism was 45.5% during 7 days. Sustained clenching resulted in a significant reduction in MBF values in the total sample (p < 0.05). Nevertheless, no significant correlation was found between frequency of awake bruxism behaviors and percent of change in MBF and endurance time during the fatigue test. Therefore, it can be concluded that young healthy adults present a relatively high frequency of awake bruxism behaviors that do not seem to impact the degree of masticatory muscle fatigue.

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“…To maintain bite force, modifications to skeletal muscle function are expected to reduce the effects of fatigue, defined as a reversible inability to maintain muscle force during repeated or sustained contractions (NHLBI, 1990). Using various techniques, fatigue in jaw muscles has been documented in a variety of vertebrates, including humans (Miles & Nordstrom, 1995;van Steenberghe et al, 1978), monkeys (Ström et al, 1994), cats (Taylor et al, 1973), dogs, pigs (Ström & Holm, 1992), rabbits (Guelinckx et al, 1986), lizards (Nguyen et al, 2020), and cartilaginous fishes (Huber et al, 2008); however, much work remains to be done exploring the prevalence and nature of jaw-muscle fatigue resistance and its role in animals' behavioral ecology. Some behaviors that require high endurance are expected to be powered by muscles capable of sustained force production (Johnston, 1985;Clark & Peters, 2006;Peters & Aulner, 2000).…”

Section: Introductionmentioning

confidence: 99%

Sustained force production by the jaw‐adductor muscles of a megalophagous frog, Ceratophrys cranwelli

2023

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Most frogs have weak jaws that play a relatively minor role in tongue‐mediated prey capture. Horned frogs (Ceratophrys spp.), however, follow the projection of a large tongue with a vice‐like grip of their jaws to hold and immobilize prey. Prey include relatively large vertebrates, which they may restrain for minutes to possibly hours. High endurance behaviors, such as prolonged biting, require that muscles be capable of sustained force production. The feeding behavior of Ceratophrys suggests that their jaw‐adductor muscles may be capable of powering sustained bites for long periods. We examined the capacity for sustained bite force by conducting an in situ experiment during which we measured bite force while bilaterally and supramaximally stimulating the jaw‐adductor muscles of euthanized Cranwell's horned frogs (C. cranwelli). Muscles were stimulated for at least 60 min with a series of tetanic trains, with one experiment lasting over 6 h. We found that a significant sustained force develops during the first few minutes of the experiment, and this force is present between tetanic trains when the muscles are not being stimulated. The sustained force persists long after tetanic forces are barely detectable. The observed sustained force phenomenon parallels that observed for the jaw‐adductor muscles of alligator lizards (Elgaria), another animal capable of sustained biting. The ability to bite with sustained and significant force by C. cranwelli may be facilitated by a configuration of different muscle fiber types, such as slow tonic fibers, as well as specializations in the muscle fibers that mitigate the effects of fatigue.

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Fatigue of Jaw Muscles and Speech Mechanisms

Cited by 6 publications

References 52 publications

Oro‐facial muscles: internal structure, function and ageing

Oro‐facial muscles: internal structure, function and ageing

Influence of awake bruxism behaviors on fatigue of the masticatory muscles in healthy young adults

Sustained force production by the jaw‐adductor muscles of a megalophagous frog, Ceratophrys cranwelli

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