Journal of Applied Physiology AJP: Heart and Circulatory Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 76: 531-538, 1994;
8750-7587/94 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Mizuno, M.
Right arrow Articles by Quistorff, B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Mizuno, M.
Right arrow Articles by Quistorff, B.

Journal of Applied Physiology, Vol 76, Issue 2 531-538, Copyright © 1994 by American Physiological Society

ARTICLES

31P-NMR spectroscopy, rsEMG, and histochemical fiber types of human wrist flexor muscles

M. Mizuno, N. H. Secher and B. Quistorff
Department of Medical Biochemistry and Genetics, Panum Institute, Copenhagen, Denmark.

The metabolic response to graded rhythmic forearm exercise determined by phosphorus-31 nuclear magnetic resonance (31P-NMR) spectroscopy was evaluated with respect to recruitment pattern of muscles and to fiber type composition of the nondominant arm in 14 untrained subjects. Rectified smoothed surface electromyography (rsEMG) over finger and wrist flexor muscles increased similarly and progressively at 30, 45, and 60% of maximal exercise intensity. On the basis of the 31P-NMR response pattern during exercise, subjects were separated into three groups: H group (n = 4), with a single high-pH P(i) peak; M group (n = 7), with two P(i) peaks reflecting two pH components; and L group (n = 3), with a single low-pH P(i) peak. The H group demonstrated a faster recovery of P(i) and phosphocreatine than the L group (P < 0.05). The M group displayed both types of P(i) recovery and an intermediate resynthesis rate of phosphocreatine. The M group had an even distribution of slow- and fast-twitch fibers in the flexor carpi radialis muscle, whereas subjects in the H and L groups possessed a predominance of slow- and fast-twitch fibers, respectively. The results suggest that during rhythmic forearm exercise the interindividual NMR variation in energy metabolism is related closely to fiber type composition of the muscle.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
H. B. Rossiter, S. A. Ward, F. A. Howe, J. M. Kowalchuk, J. R. Griffiths, and B. J. Whipp
Dynamics of intramuscular 31P-MRS Pi peak splitting and the slow components of PCr and O2 uptake during exercise
J Appl Physiol, December 1, 2002; 93(6): 2059 - 2069.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
C. J. Houtman, A. Heerschap, M. J. Zwarts, and D. F. Stegeman
pH heterogeneity in tibial anterior muscle during isometric activity studied by 31P-NMR spectroscopy
J Appl Physiol, July 1, 2001; 91(1): 191 - 200.
[Abstract] [Full Text] [PDF]

Home page
 Integr. Comp. Biol.Home page
P. Cerretelli and B. Grassi
Gas Exchange, MRS and NIRS Assessment of Metabolic Transients in Skeletal Muscle
Integr. Comp. Biol., April 1, 2001; 41(2): 229 - 246.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Cell Physiol.Home page
J. A. L. Jeneson, H. V. Westerhoff, and M. J. Kushmerick
A metabolic control analysis of kinetic controls in ATP free energy metabolism in contracting skeletal muscle
Am J Physiol Cell Physiol, September 1, 2000; 279(3): C813 - C832.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Cell Physiol.Home page
P. Vicini and M. J. Kushmerick
Cellular energetics analysis by a mathematical model of energy balance: estimation of parameters in human skeletal muscle
Am J Physiol Cell Physiol, July 1, 2000; 279(1): C213 - C224.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online