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Titolo:
Sex differences in the fatigability of arm muscles depends on absolute force during isometric contractions
Autore:
Hunter, SK; Enoka, RM;
Indirizzi:
Univ Colorado, Dept Kinesiol & Appl Physiol, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 & Appl Physiol, Boulder, CO 80309 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 91, anno: 2001,
pagine: 2686 - 2694
SICI:
8750-7587(200112)91:6<2686:SDITFO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
TISSUE GLYCOGEN-METABOLISM; SYMPATHETIC-NERVE ACTIVITY; ADDUCTOR POLLICIS MUSCLE; HUMAN SKELETAL-MUSCLE; GENDER DIFFERENCES; FATIGUING CONTRACTION; STATIC CONTRACTION; ENDURANCE EXERCISE; HANDGRIP EXERCISE; BLOOD-FLOW;
Keywords:
gender; pressor response; electromyography; elbow flexor muscles; muscle activation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Enoka, RM Univ Colorado, Dept Kinesiol & Appl Physiol, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 ysiol, Boulder, CO 80309 USA
Citazione:
S.K. Hunter e R.M. Enoka, "Sex differences in the fatigability of arm muscles depends on absolute force during isometric contractions", J APP PHYSL, 91(6), 2001, pp. 2686-2694

Abstract

Women are capable of longer endurance times compared with men for contractions performed at low to moderate intensities. The purpose of the study was1) to determine the relation between the absolute target force and endurance time for a submaximal isometric contraction and 2) to compare the pressor response and muscle activation patterns of men [26.3 +/- 1.1 (SE) yr] andwomen (27.5 +/- 2.3 yr) during a fatiguing contraction performed with the elbow flexor muscles. Maximal voluntary contraction (MVC) force was greaterfor men (393 +/- 23 vs. 177 +/- 7 N), which meant that the average target force (20% of MVC) was greater for men (79.7 +/- 6.5 vs. 36.7 +/- 2.0 N). The endurance time for the fatiguing contractions was 118% longer for women (1,806 +/- 239 vs. 829 +/- 94 s). The average of the rectified electromyogram (%MVC) for the elbow flexor muscles at exhaustion was similar for men (31 +/- 2%) and women (30 +/- 2%). In contrast, the heart rate and mean arterial pressure (MAP) were less at exhaustion for women (94 +/- 6 vs. 111 +/- 7 beats/min and 121 +/- 5 vs. 150 +/- 6 mmHg, respectively). The target force and change in MAP during the fatiguing contraction were exponentially related to endurance time (r(2) = 0.68 and r(2) = 0.64, respectively), whereas the change in MAP was linearly related to target force (r(2) = 0.51). Thedifference in fatigability of men and women when performing a submaximal contraction was related to the absolute contraction intensity and was limited by mechanisms that were distal to the activation of muscle.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:19:23