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Passive heating and glycaemic control in non-diabetic and diabetic individuals: A systematic review and meta-analysis

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  • Matthew J Maley
  • Andrew P Hunt
  • Ian B Stewart
  • Steve H Faulkner
  • Geoffrey M Minett

Abstract

Objective: Passive heating (PH) has begun to gain research attention as an alternative therapy for cardio-metabolic diseases. Whether PH improves glycaemic control in diabetic and non-diabetic individuals is unknown. This study aims to review and conduct a meta-analysis of published literature relating to PH and glycaemic control. Methods: Electronic data sources, PubMed, Embase and Web of Science from inception to July 2018 were searched for randomised controlled trials (RCT) studying the effect of PH on glycaemic control in diabetic or non-diabetic individuals. To measure the treatment effect, standardised mean differences (SMD) with 95% confidence intervals (CI) were calculated. Results: Fourteen articles were included in the meta-analysis. Following a glucose load, glucose concentration was greater during PH in non-diabetic (SMD 0.75, 95% CI 1.02 to 0.48, P 0.050) and a glucose challenge given within 24 hours post-heating (SMD 0.30, 95% CI 0.62 to -0.02, P > 0.050). Conclusion: PH preceded by a glucose load results in acute glucose intolerance in non-diabetic and diabetic individuals. However, heating a non-diabetic individual without a glucose load appears not to affect glycaemic control. Likewise, a glucose challenge given within 24 hours of a single-bout of heating does not affect glucose tolerance in non-diabetic individuals. Despite the promise PH may hold, no short-term benefit to glucose tolerance is observed in non-diabetic individuals. More research is needed to elucidate whether this alternative therapy benefits diabetic individuals.

Suggested Citation

  • Matthew J Maley & Andrew P Hunt & Ian B Stewart & Steve H Faulkner & Geoffrey M Minett, 2019. "Passive heating and glycaemic control in non-diabetic and diabetic individuals: A systematic review and meta-analysis," PLOS ONE, Public Library of Science, vol. 14(3), pages 1-18, March.
    • Handle: RePEc:plo:pone00:0214223
    DOI: 10.1371/journal.pone.0214223
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    1. Jiro Hirosumi & Gürol Tuncman & Lufen Chang & Cem Z. Görgün & K. Teoman Uysal & Kazuhisa Maeda & Michael Karin & Gökhan S. Hotamisligil, 2002. "A central role for JNK in obesity and insulin resistance," Nature, Nature, vol. 420(6913), pages 333-336, November.
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