A simple ergometer for 31P NMR spectroscopy during dynamic forearm exercise in a whole body magnetic resonance imaging system

Jpn Heart J. 1992 Mar;33(2):185-92. doi: 10.1536/ihj.33.185.


The purpose of this study was to construct a simple ergometer for the 31P NMR spectroscopic study of dynamic forearm exercise in a whole body magnetic resonance imaging system and to evaluate the total system and the physiological response to this type of exercise using a multistage protocol. The system consisted of a completely nonmagnetic assembly including a rope, pulley and weights. The work of lifting weights was quantitated. The exercise protocol of 1-min increments in work load enabled subjects to reach maximal effort. Phosphocreatine decreased linearly with an increase in work load and was accompanied by a fall in pH and an increase in lactate level in the antecubital vein of the exercising forearm; concomitantly, there was a slight increase in whole body oxygen uptake and heart rate. Spectroscopy gave reproducible results using this exercise protocol. These results demonstrate that this system provides a reliable means for performing 31P magnetic resonance spectroscopy studies during forearm exercise.

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Adult
  • Ergometry / instrumentation*
  • Forearm
  • Humans
  • Hydrogen-Ion Concentration
  • Magnetic Resonance Spectroscopy / instrumentation
  • Magnetic Resonance Spectroscopy / methods*
  • Muscles / metabolism
  • Phosphates / metabolism
  • Phosphocreatine / metabolism
  • Physical Exertion*
  • Reproducibility of Results


  • Phosphates
  • Phosphocreatine
  • Adenosine Triphosphate