Changes in metabolic acidosis: Evidence for an intensity threshold

S. Sady, V. Katch, P. Freedson, A. Weltman

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


A group of overfat females (mean %fat=30.0) trained on a bicycle ergometer 4 times a week for 8 weeks at exercise intensity levels below (40% VO(2) max) and above (80% VO(2) max) the level of metabolic acidosis (MA) (estimated from gas exchange variables). Four females served as controls. A one-way ANCOVA revealed a significant (p < .05) training effect for VO(2) max and VO(2) at the onset of MA (VO(2)-MA). Post-hoc analysis indicated that both training groups differed from the control in the change in VO(2) max, but VO(2)-MA increased in only the high intensity group. There were no differences among groups in pre to post max HR, max R, %fat, or body weight. The high intensity group decreased relatively more (21%) than the low intensity group (3%) in exercise R values, even though both groups consumed identical quantities of oxygen during training. The major finding is the increase in VO(2)-MA in the high intensity group. Apparently, a major effect of training intensity is to increase the amount of work which is performed aerobically, before the onset of MA. This specific training effect appears to be independent of the total caloric cost of training and also of changes in body composition and VO(2) max.

Original languageEnglish (US)
Pages (from-to)41-46
Number of pages6
JournalJournal of Sports Medicine and Physical Fitness
Issue number1
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation


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