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Titolo:
pH heterogeneity in tibial anterior muscle during isometric activity studied by P-31-NMR spectroscopy
Autore:
Houtman, CJ; Heerschap, A; Zwarts, MJ; Stegeman, DF;
Indirizzi:
Univ Med Ctr, Inst Neurol, Dept Clin Neurophysiol, NL-6500 HB Nijmegen, Netherlands Univ Med Ctr Nijmegen Netherlands NL-6500 HB 00 HB Nijmegen, Netherlands Univ Med Ctr, Dept Radiodiag, NL-6500 HB Nijmegen, Netherlands Univ Med Ctr Nijmegen Netherlands NL-6500 HB 00 HB Nijmegen, Netherlands
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 91, anno: 2001,
pagine: 191 - 200
SICI:
8750-7587(200107)91:1<191:PHITAM>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; MAGNETIC-RESONANCE SPECTROSCOPY; INORGANIC-PHOSPHATE PEAK; WRIST FLEXOR MUSCLES; HUMAN CALF MUSCLE; 36 HUMAN MUSCLES; FIBER TYPES; RELAXATION-TIMES; EXERCISE; FATIGUE;
Keywords:
human; size principle; muscle fatigue; sustained isometric exercise; P-31 nuclear magnetic resonance spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Houtman, CJ Univ Med Ctr, Inst Neurol, Dept Clin Neurophysiol, 314,POB 9101, NL-6500 HB Nijmegen, Netherlands Univ Med Ctr 314,POB 9101 Nijmegen Netherlands NL-6500 HB nds
Citazione:
C.J. Houtman et al., "pH heterogeneity in tibial anterior muscle during isometric activity studied by P-31-NMR spectroscopy", J APP PHYSL, 91(1), 2001, pp. 191-200

Abstract

The occurrence of pH heterogeneity in human tibial anterior muscle during sustained isometric exercise is demonstrated by applying P-31-nuclear magnetic resonance (NMR) spectroscopy in a study of seven healthy subjects. Exercise was performed at 30 and 60% of maximal voluntary contraction (MVC) until fatigue. The NMR spectra, as localized by a surface coil and improved byproton irradiation, were obtained at a high time resolution (16 s). They revealed the simultaneous presence of two pH pools during most experiments. Maximum difference in the two pH levels during exercise was 0.40 +/- 0.07 (30% MVC, n = 7) and 0.41 +/- 0.03 (60% MVC, n = 3). Complementary two-dimensional P-31 spectroscopic imaging experiments in one subject supported the supposition that the distinct pH pools reflect the metabolic status of the main muscle fiber types. The relative size of the P-i peak in the spectrum attributed to the type II fiber pool increases with decreasing pH levels. This phenomenon is discussed in the context of the size principle stating that the smaller (type I) motor units are recruited first.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:24:59