Effects of Specific Warm-Up at Various Intensities on Energy Metabolism During Subsequent Exercise

J Sports Med Phys Fitness. 2000 Jun;40(2):126-30.

Abstract

Background: To investigate the effects of specific warm-up at various intensities on energy metabolism during subsequent intense exercise.

Experimental design: specific warm-up was consisted of 3 sets of wrist flexions for 5 min, with each set followed by a 3-min rest. The intensity of specific warm-up was set at 20%, 30% or 40% of maximal voluntary contraction (MVC). The subjects then performed a set of wrist flexions at 60% MVC for 4 min as the criterion exercise. For the control experiment, criterion exercise was done without specific warm-up.

Participants: Five healthy volunteers.

Measurements: using phosphorus-31 magnetic resonance spectroscopy, spectra were obtained from the wrist flexor muscles to determine the ratio of inorganic phosphate to phosphocreatine (Pi/PCr) and intracellular pH.

Results: The Pi/PCr during the criterion exercise after specific warm-up at any intensity was not significantly different from that without specific warm-up. The intracellular pH during the criterion exercise after specific warm-up at 30% or 40% MVC was significantly higher than that without specific warm-up.

Conclusions: These results indicate that mild warm-up exercise could inhibit the development of intracellular acidosis during subsequent intense exercise.

Publication types

  • Evaluation Study

MeSH terms

  • Adult
  • Energy Metabolism*
  • Exercise / physiology*
  • Humans
  • Magnetic Resonance Spectroscopy
  • Male
  • Muscle, Skeletal / metabolism*
  • Phosphates / metabolism*
  • Phosphocreatine / metabolism*
  • Phosphorus Radioisotopes

Substances

  • Phosphates
  • Phosphorus Radioisotopes
  • Phosphocreatine