Physical Activity and Improvement of Glycemia in Prediabetes by Different Diagnostic Criteria

J Clin Endocrinol Metab. 2017 Oct 1;102(10):3712-3721. doi: 10.1210/jc.2017-00990.

Abstract

Context: The effects of physical activity (PA) on improvement of glycemia may differ between prediabetic individuals defined by oral glucose tolerance test vs glycated hemoglobin (HbA1c).

Objective: We studied the association between PA and improvement of glycemia in individuals with prediabetes defined by glucose vs HbA1c criteria.

Design, setting, and participants: From the Whitehall II study, 957 participants with prediabetes defined by isolated impaired fasting glucose (i-IFG), isolated impaired glucose tolerance (i-IGT), or both and 457 with prediabetes defined by HbA1c were included.

Main outcome measures: The associations of PA with concomitant changes in glucose-related outcomes during 5 years of follow-up were analyzed. A recursive partitioning analysis was performed to study heterogeneity in the association between baseline PA and the probability of reversion to normoglycemia.

Results: After 5 years of follow-up, 405 (42%) individuals with glucose-defined prediabetes reverted to normal glucose tolerance (NGT). A 5-year increase in moderate-to-vigorous-intensity PA was associated with improvements in insulin sensitivity and β-cell function, but PA was not generally associated with reversion to NGT. Only among women ≥50 years with i-IFG or i-IGT, higher amounts of PA were associated with higher probability of reversion to NGT. In HbA1c-defined prediabetes, only 20 individuals (4.4%) reverted to normoglycemia, and PA was not associated with improvement in glycemic markers.

Conclusions: PA may be particularly important for reversion to normoglycemia among older women with i-IFG or i-IGT. Individuals with prediabetes identified by HbA1c have a low probability of reversion to normoglycemia, and their changes in glycemia are not related to PA.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Blood Glucose / analysis*
  • Blood Glucose / metabolism
  • Cohort Studies
  • Exercise / physiology*
  • Female
  • Follow-Up Studies
  • Glucose Intolerance / blood
  • Glucose Intolerance / diagnosis*
  • Glucose Tolerance Test / classification
  • Glucose Tolerance Test / methods
  • Glycated Hemoglobin A / analysis
  • Glycated Hemoglobin A / metabolism
  • Humans
  • Male
  • Middle Aged
  • Prediabetic State / blood*
  • Prediabetic State / diagnosis*

Substances

  • Blood Glucose
  • Glycated Hemoglobin A