Different Metabolic Responses during Incremental Exercise Assessed by Localized 31P MRS in Sprint and Endurance Athletes and Untrained Individuals

D. Pesta; V. Paschke; F. Hoppel; C. Kobel; C. Kremser; R. Esterhammer; M. Burtscher; G. J. Kemp; M. Schocke

doi:10.1055/s-0032-1327648

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2013; 34(08): 669-675
DOI: 10.1055/s-0032-1327648

Physiology & Biochemistry

Different Metabolic Responses during Incremental Exercise Assessed by Localized ³¹P MRS in Sprint and Endurance Athletes and Untrained Individuals

Authors

D. Pesta

¹Department of Radiology, Innsbruck Medical University, Innsbruck, Austria

²Department of Sports Science, University of Innsbruck, Innsbruck, Austria
V. Paschke

¹Department of Radiology, Innsbruck Medical University, Innsbruck, Austria
F. Hoppel

²Department of Sports Science, University of Innsbruck, Innsbruck, Austria
C. Kobel

³Department of Medical Statistics, Informatics and Health Economics, Innsbruck Medical University, Innsbruck, Austria
C. Kremser

¹Department of Radiology, Innsbruck Medical University, Innsbruck, Austria
R. Esterhammer

¹Department of Radiology, Innsbruck Medical University, Innsbruck, Austria
M. Burtscher

²Department of Sports Science, University of Innsbruck, Innsbruck, Austria
G. J. Kemp

⁴Magnetic Resonance and Image Analysis Research Centre (MARIARC) and Department of Musculoskeletal Biology, University of Liverpool, Liverpool, United Kingdom
M. Schocke

⁴Magnetic Resonance and Image Analysis Research Centre (MARIARC) and Department of Musculoskeletal Biology, University of Liverpool, Liverpool, United Kingdom

Abstract

Until recently, assessment of muscle metabolism was only possible by invasive sampling. ³¹P magnetic resonance spectroscopy (³¹P MRS) offers a way to study muscle metabolism non-invasively. The aim of the present study was to use spatially-resolved ³¹P MRS to assess the metabolism of the quadriceps muscle in sprint-trained, endurance-trained and untrained individuals during exercise and recovery. 5 sprint-trained (STA), 5 endurance-trained (ETA) and 7 untrained individuals (UTI) completed one unlocalized ³¹P MRS session to measure phosphocreatine (PCr) recovery, and a second session in which spatially-resolved ³¹P MR spectra were obtained. PCr recovery time constant (τ) was significantly longer in STA (50±17 s) and UTI (41±9 s) than in ETA (30±4 s), (P<0.05). PCr changes during exercise differed between the groups, but were uniform across the different components of the quadriceps within each group. pH during recovery was higher for the ETA than for the UTI (P<0.05) and also higher than for the STA (P<0.01). Muscle volume was greater in STA than in UTI (P<0.05) but not different from ETA. Dynamic ³¹P MRS revealed considerable differences among endurance and sprint athletes and untrained people. This non-invasive method offers a way to quantify differences between individual muscles and muscle components in athletes compared to untrained individuals.

Key words

³¹P MRS - CSI - PCr recovery - muscle function - exercise training

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Referenzen

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