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Titolo:
Group III muscle afferents evoke reflex depressor responses to repetitive muscle contractions in rabbits
Autore:
Legramante, JM; Raimondi, G; Adreani, CM; Sacco, S; Iellamo, F; Peruzzi, G; Kaufman, MP;
Indirizzi:
Univ Roma Tor Vergata, Cattedra Fisiopatol Med, Dipartimento Med Interna, I-00173 Rome, Italy Univ Roma Tor Vergata Rome Italy I-00173 ed Interna, I-00173 Rome, Italy Univ Calif Davis, Dept Internal Med, Div Cardiovasc Med, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 v Cardiovasc Med, Davis, CA 95616 USA Univ Calif Davis, Dept Human Physiol, Div Cardiovasc Med, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 v Cardiovasc Med, Davis, CA 95616 USA
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
fascicolo: 3, volume: 278, anno: 2000,
pagine: H871 - H877
SICI:
0363-6135(200003)278:3<H871:GIMAER>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESPIRATORY RESPONSES; STATIC EXERCISE; PRESSOR REFLEX; STIMULATION; NERVES;
Keywords:
dynamic exercise; autonomic nervous system; arterial blood pressure; sensory nerves; somatic afferents; breathing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Legramante, JM Univ Roma Tor Vergata, Cattedra Fisiopatol Med, Dipartimento Med Interna, Via O Raimondo, I-00173 Rome, Italy Univ Roma Tor Vergata Via O Raimondo Rome Italy I-00173 ly
Citazione:
J.M. Legramante et al., "Group III muscle afferents evoke reflex depressor responses to repetitive muscle contractions in rabbits", AM J P-HEAR, 278(3), 2000, pp. H871-H877

Abstract

Repetitive twitch contraction of the hindlimb muscles in anesthetized rabbits consistently evokes a reflex depressor response, whereas this type of contraction in anesthetized cats evokes a reflex presser response in about one-half of the preparations tested. Rapidly conducting group III fibers appear to comprise the afferent arm of the reflex are, evoking the depressor response to twitch contraction in rabbits because electrical stimulation of their axons reflexly decreases arterial pressure. In contrast, electrical stimulation of the axons of slowly conducting group III and group TV afferents reflexly increases arterial pressure in rabbits. In the present study, we examined the discharge properties of group III and IV muscle afferents and found that the former (i.e., 13 of 20), but not the latter (i.e., 0 of 10), were stimulated by 5 min of repetitive twitch contraction (1 Hz) of the rabbit triceps surae muscles. Moreover, most of the group III afferents responding to contraction appeared to be mechanically sensitive, discharging in synchrony with the muscle twitch. On average, rapidly conducting group III afferents responded for the 5-min duration of l-Hz repetitive-twitch contraction, whereas slowly conducting group III efferents responded only for the first 2 min of contraction. We conclude that rapidly conducting group III afferents, which are mechanically sensitive, are primarily responsible for evoking the reflex depressor response to repetitive-twitch contractions in anesthetized rabbits.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 00:53:14