Músculo tiroaritenoideo e som basal: uma revisão de literatura

Abstract

BSTRACTThe work of speech-language pathologists uses exercises such as the vocal fry (VF), which originates from the great contractile activity of the intrinsic laryngeal thyroarytenoid muscle (TA). The aim of this study was to review the literature related to TA and VF.A literature review of the last 20 years on the subject was performed in the databases LILACS, SciELO, PubMed, Web of Science and Google Scholar. It was found that the internal beam of the TA has slow twitch fibers, isotonic, resistant to fatigue; the external beam provides fast twitch, fatigable and isometric fibers. The VF is characterized by the perception of the vibration of the glottal pulses during the emission of the lowest frequencies in the vocal range (crackling in bass or vocal fry), mainly by the action of the TA, especially its inner portion, which shows evident shortening, dropping the mucosa in great volume along the free edge, increasing subglottic pressure and jitter, shimmer and noise levels, and reducing the airflow. Based on the literature, the isometric exercise with the external TA happens with VF sustained in the lowest possible frequency to the subject (maximum contraction), for six seconds, five to ten times daily, consistent with its predominance of fast twitch fibers. In the isotonic exercise with the internal TA, high sounds must be to stretch the muscle, alternating emissions by VF (concentric contraction) and in modal register and falsetto head (high-pitched sounds) (eccentric contraction) with several daily series of eight to 12 repetitions, consistent with the predominance of slow twitch fibers.

Parameters Acoustic and High-speed kymography identified effects of voiced vibration and vocal fry exercises

“…Another study verifi ed increased jitter in two adult women with hourglass-shaped glottal gap (4,8) . Our results diverge from the aforementioned ones; however, there is no consensus in current literature on the indication of time of execution of the vocal fry for therapeutic application (26) . The duration of the exercise may not have been suffi cient to cause signifi cant changes in the studied voices.…”

“…There was decreased cPh for both genders, and this was the only measure with significant changes for male vocal folds (p=0.026). According to literature (2,7,8,26) , during the emission of vocal fry, vocal folds become shorter, in medial position, with firmer glottic closure due to maximal contraction of the thyroarytenoid muscle. Under these conditions, vocal fold mucosa presents more vibration amplitude, that is, it becomes looser along the free border, thus enabling more oscillatory movement.…”

“…There were no statistical differences for male voices. Literature describes the physiological effect of the vocal fry as the increment in perturbation measures during emission, both in frequency and amplitude (8,26) . A case study assessed the healthy voice of five adult women and did not fi nd changes in the mentioned parameters (4) .…”

Síndrome de tensão musculoesquelética, musculatura laríngea extrínseca e postura corporal: considerações teóricas

“…The exercise of basal tone or vocal fry can also be indicated in some cases of muscle tension dysphonia (laryngeal isometrics, vocal fatigue, uncomfortable speech, mid-posterior triangular chink) 1,38,39 . The psalmody voice is a vocal technique that promotes muscle adjustment more efficiently and at lower muscle tension intrinsic and extrinsic of the larynx, as well as greater respiratory support, making the individual use greater airway pressure over the strong adduction between the vocal folds.…”

Efeitos imediatos da técnica de vibração sonorizada de língua associada à estimulação nervosa elétrica transcutânea (TENS)

“…The understanding of the effect caused by vocal exercises on vocal quality has been the subject of many research studies which look into various vocal techniques, employing them in isolation (1)(2)(3)(4)(5)(6) or joining techniques in the therapeutic process (7)(8)(9)(10) ; in addition to comparing the effect of the application of different techniques (11)(12)(13) or in programs (14,15) . It is also possible to find literature containing review articles on the application of vocal techniques in various therapeutic proposals (16,17) .…”