Impact of sleep duration on obesity and the glycemic level in patientswith type 2diabetes

Toshiaki Ohkuma, Hiroki Fujii, Masanori Iwase, Yohei Kikuchi, Shinako Ogata, Yasuhiro Idewaki, Hitoshi Ide, Yasufumi Doi, Yoichiro Hirakawa, Udai Nakamura, Takanari Kitazono

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)


OBJECTIVEdFew studies are currently available regarding the influence of sleep duration on glycemic control in diabetic patients. The objective of the current study was to examine the relationship between sleep duration, obesity, and the glycemic level in type 2 diabetic patients. RESEARCH DESIGN AND METHODSdA total of 4,870 Japanese type 2 diabetic patients aged 20 years were divided into six groups according to their self-reported sleep duration: less than 4.5 h, 4.5-5.4 h, 5.5-6.4 h, 6.5-7.4 h, 7.5-8.4 h, and more than 8.5 h. The associations of sleep duration with obesity and the HbA1c levels were examined in a crosssectional manner. RESULTSdThe HbA1c levels showed a quadratic association with sleep duration; namely, a shorter or longer sleep duration was associated with a higher level compared with a sleep duration of 6.5-7.4 h (P for quadratic trend ,0.001). This association remained significant after adjusting for potential confounders, including the total energy intake and depressive symptoms. Furthermore, additional adjustments for obesity, which also showed a U-shaped relationship with sleep duration, did not attenuate the U-shaped sleep-HbA1c association. A significant interaction between sleep duration and age or the use of insulin was observed for the HbA1c levels. CONCLUSIONSdSleep duration was shown to have U-shaped associations with obesity and the HbA1c levels in type 2 diabetic patients, independent of potential confounders, and therefore may be an important modifiable factor for the clinical management of patients with type 2 diabetes.

Original languageEnglish
Pages (from-to)611-617
Number of pages7
JournalDiabetes care
Issue number3
Publication statusPublished - Mar 2013

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Advanced and Specialised Nursing


Dive into the research topics of 'Impact of sleep duration on obesity and the glycemic level in patientswith type 2diabetes'. Together they form a unique fingerprint.

Cite this