Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Endurance training under 2500-m hypoxia does not increase myoglobin content in human skeletal muscle
Autore:
Masuda, K; Okazaki, K; Kuno, S; Asano, K; Shimojo, H; Katsuta, S;
Indirizzi:
Univ Tsukuba, Ctr Tsukuba Adv Res Alliance, Tsukuba, Ibaraki 3058577, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058577 sukuba, Ibaraki 3058577, Japan Shinshu Univ, Sch Med, Dept Sports Med, Matsumoto, Nagano 3908621, Japan Shinshu Univ Matsumoto Nagano Japan 3908621 sumoto, Nagano 3908621, Japan Univ Tsukuba, Inst Hlth & Sport Sci, Tsukuba, Ibaraki 3058574, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058574 sukuba, Ibaraki 3058574, Japan Univ E Asia, Grad Sch Integrated Sci & Art, Yamaguchi 7518503, Japan Univ E Asia Yamaguchi Japan 7518503 Sci & Art, Yamaguchi 7518503, Japan
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 85, anno: 2001,
pagine: 486 - 490
SICI:
1439-6319(200109)85:5<486:ETU2HD>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
O-2 TRANSPORT; INTENSITY; DESATURATION; MYOCARDIUM; EXPRESSION; PROMOTER; CAPACITY; EXERCISE; ENZYMES; MEN;
Keywords:
citrate synthase activity; endurance training; human; maximal oxygen consumption; myoglobin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Masuda, K Univ Tsukuba, Ctr Tsukuba Adv Res Alliance, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058577, Japan Univ Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki Japan 3058577 Japan
Citazione:
K. Masuda et al., "Endurance training under 2500-m hypoxia does not increase myoglobin content in human skeletal muscle", EUR J A PHY, 85(5), 2001, pp. 486-490

Abstract

The present study was carried out to determine whether myoglobin (Mb) concentration ([Mb]) in human skeletal muscle is influenced by 8 weeks of endurance training under normal conditions, and under hypoxic conditions equivalent to an altitude of 2500 m. Fourteen healthy but sedentary male adults who did not participate in any regular exercise program took part in this study. They were divided into two groups according to the training regime to which they were submitted: the N group, who exercised under normobaric conditions, and the H group, who exercised under hypobaric conditions. All subjects performed an incremental cycling exercise at sea level to evaluate their maximal O-2 uptake ((V)over dotO(2max)) before and after the 8-week endurance training course period. Muscle tissue samples were obtained by needle biopsy from the vastus lateralis muscle for histochemical and biochemical analysis. Training induced an increase in (V)over dotO(2max) in both the N and H groups (P < 0.05), although there was no significant difference in these changes between groups. The 8-week training had no effect on [Mb] in either group. Muscle fiber composition was also unaffected by the training course. In contrast, citrate synthase activity in both groups increased by [mean (SD)] 28.2 (33.3)% (N: P < 0.01) and 32.0 (18.2)% (H: P < 0.05) after training, and the number of capillaries (capillary: fiber ratio) increased by47.7 (33.8)% (N: P < 0.01) and 32.3 (20.6)% (H: P < 0.05). There were no significant differences in these parameters between the N and H groups. These results suggest that significant improvement of aerobic potential as a result of endurance training are not accompanied by increases in [Mb] in human skeletal muscle. In addition, a lower absolute workload may not be sufficient to stimulate Mb synthesis in humans, even where endurance training is carried out under hypoxia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 01:45:29