pH heterogeneity during exercise in localized spectra from single human muscles
1993; American Physical Society; Volume: 265; Issue: 5 Linguagem: Inglês
10.1152/ajpcell.1993.265.5.c1332
ISSN1522-1563
AutoresKrista Vandenborne, Glenn Walter, J.S. Leigh, Gadi Goelman,
Tópico(s)Cardiovascular and exercise physiology
ResumoWe investigated whether pH heterogeneity in skeletal muscle during exercise, observed with 31P nuclear magnetic resonance, represents muscle fiber type heterogeneity. Localized spectra were simultaneously acquired from the soleus, medial, and lateral gastrocnemius using a multivolume localization technique, the Hadamard spectroscopic imaging (HSI) technique. Contamination of nonselected regions to the localized volumes was < 5%. HSI-localized spectra were obtained from the calf muscles of untrained subjects and a small group of athletes. Two plantar flexion exercise protocols were implemented: a "maximal" high frequency protocol and a "steady-state" protocol at low contraction frequency (0.25 Hz). pH heterogeneity was observed in localized spectra of single muscles during both exercise protocols, as indicated by the large Pi line width. During maximal exercise the Pi line width was up to three times wider than the phosphocreatine line width, covering an entire pH unit. During the steady-state exercise, in three subjects the Pi peak clearly resolved into two distinct peaks, one at low pH and one at high pH. As pH heterogeneity was observed in localized spectra of single muscles during both exercise protocols, it most likely reflects the metabolic heterogeneity between fiber types.
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