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Titolo:
Effect of human exposure to altitude on muscle endurance during isometric contractions
Autore:
Felici, F; Rosponi, A; Sbriccoli, P; Scarcia, M; Bazzucchi, I; Iannattone, M;
Indirizzi:
Univ Rome, Inst Motor Sci, Fac Motor Sci, Exercise Physiol Lab, I-00194 Rome, Italy Univ Rome Rome Italy I-00194 , Exercise Physiol Lab, I-00194 Rome, Italy Univ Roma La Sapienza, Fac Med, Postgrad Sch Specializat Sport Med, I-00185 Rome, Italy Univ Roma La Sapienza Rome Italy I-00185 Sport Med, I-00185 Rome, Italy Rehabil Hosp, S Lucia Fdn, I-00179 Rome, Italy Rehabil Hosp Rome Italy I-00179 l Hosp, S Lucia Fdn, I-00179 Rome, Italy
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 85, anno: 2001,
pagine: 507 - 512
SICI:
1439-6319(200110)85:6<507:EOHETA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTREME ALTITUDES; EXERCISE; FATIGUE; SIGNALS;
Keywords:
altitude; isometric endurance; electromyography; median frequency; non-linear analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Felici, F Univ Rome, Inst Motor Sci, Fac Motor Sci, Exercise Physiol Lab, Piazza Lauro De Bosis 15, I-00194 Rome, Italy Univ Rome Piazza Lauro De Bosis 15 Rome Italy I-00194 me, Italy
Citazione:
F. Felici et al., "Effect of human exposure to altitude on muscle endurance during isometric contractions", EUR J A PHY, 85(6), 2001, pp. 507-512

Abstract

The aim of this study was to evaluate the influence of exposure to altitude on muscle endurance during isometric contractions. Six sedentary subjectswere studied. Surface electromyograph (sEMG) activity was recorded from the right biceps brachii (BB) during exhausting isometric exercise at 80% maximal voluntary contraction. Experiments were performed before, during and 6months after a 12 day stay at the EV-K2 laboratory (Nepal, 5,050 in above sea level). From the sEMG signals from BB, the median frequencies (f(med)) were computed for consecutive 1 s epochs. The sEMG was also analysed using a non-linear tool, the recurrence quantification analysis, and the percentage of determinism (%DET) was then calculated. The haemoglobin saturation significantly decreased at altitude. The mean (SD) BB endurance time decreased from 22.4 (4) s to 18.3 (4.7) s (P < 0.05). After exposure to altitude a significant variation in fmd and %DET slopes was observed. We concluded that during the first period of acclimatisation at altitude there was an impairment of isometric muscle endurance performance and there was also evidenceof a modified myoelectric activity pattern suggesting a greater fatigability of the neuromuscular system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/10/20 alle ore 14:34:04