Adenosine triphosphate production rates, metabolic economy calculations, pH, phosphomonoesters, phosphodiesters, and force output during short- duration maximal isometric plantar flexion exercises and repeated maximal isometric plantar flexion exercises

Bradley R. Newcomer, Michael D. Boska

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Measurements of adenosine triphosphate (ATP) production rates, metabolic economy, intracellular pH, phosphodiesters, and phosphomonoesters along with the force output were used to study 90-s maximum voluntary contractions and two new exercise protocols (20-10 and 30-16 exercises). The 20-10 exercise consisted of thirty-one 20-s maximal voluntary contractions separated by 10- s rest periods. The 30-16 exercise consisted of twenty 30-s maximal voluntary contractions separated by 16-s rest periods. There were no differences in ATP production rates, metabolic economy, intracellular pH, or force output between the 20-10 and 30-16 exercises. The 20-10 exercises accumulated more phosphomonoesters than the 3016 exercises. These increases in phosphomonoesters may be attributed to increased accumulations of glucose-6- phosphate and/or inosine monophosphate. The increased perception of effort reported during and after the 20-10 exercises was not present during the 30- 16 or 90-s exercises. This increased perception of effort may be related to increases in lactate, glucose-6-phosphate, inosine monophosphate, and/or NH3.

Original languageEnglish (US)
Pages (from-to)336-346
Number of pages11
JournalMuscle and Nerve
Volume20
Issue number3
DOIs
StatePublished - 1997

Keywords

  • P magnetic resonance spectroscopy of exercising muscle
  • adenosine triphosphate production rates
  • fatigue

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)

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