Intermittent hypoxia, energy expenditure, and visceral adipocyte recovery

Akira Umeda, Kazuya Miyagawa, Atsumi Mochida, Hiroshi Takeda, Kotaro Takeda, Yasumasa Okada, David Gozal

Research output: Contribution to journalArticle

Abstract

Background and objective: Body weight of patients with obstructive sleep apnea after initiation of nasal continuous positive airway pressure appears to increase. We hypothesized that intermittent hypoxia (IH) will decrease energy expenditure (EE), and that normoxic recovery will lead to body weight gains. Methods: C57BL/6 J male mice were exposed to either 12 h/day of mild IH (alternating FIO2-10-11% and 21%; 640 s cycle), or severe IH (FIO2-6-7%-21%; 180 s cycle) or sham IH daily for 4 or 8 weeks. After exposures, EE was evaluated while mice were kept under normoxia for 5 weeks and organ histology was evaluated. Results: EE was not decreased by IH. However, visceral white adipocyte size after normoxic recovery was significantly increased in severe IH in an intensity-dependent manner. Conclusion: Our hypothesis that IH would decrease EE was not corroborated. However, IH and normoxic recovery seem to promote severity-dependent enlargement of visceral adipocytes, likely reflecting altered energy preservation mechanisms induced by IH.

Original languageEnglish
Article number103332
JournalRespiratory Physiology and Neurobiology
Volume273
DOIs
Publication statusPublished - 02-2020

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Adipocytes
Energy Metabolism
White Adipocytes
Body Weight
Hypoxia
Continuous Positive Airway Pressure
Obstructive Sleep Apnea
Weight Gain
Histology

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Physiology
  • Pulmonary and Respiratory Medicine

Cite this

Umeda, Akira ; Miyagawa, Kazuya ; Mochida, Atsumi ; Takeda, Hiroshi ; Takeda, Kotaro ; Okada, Yasumasa ; Gozal, David. / Intermittent hypoxia, energy expenditure, and visceral adipocyte recovery. In: Respiratory Physiology and Neurobiology. 2020 ; Vol. 273.
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abstract = "Background and objective: Body weight of patients with obstructive sleep apnea after initiation of nasal continuous positive airway pressure appears to increase. We hypothesized that intermittent hypoxia (IH) will decrease energy expenditure (EE), and that normoxic recovery will lead to body weight gains. Methods: C57BL/6 J male mice were exposed to either 12 h/day of mild IH (alternating FIO2-10-11{\%} and 21{\%}; 640 s cycle), or severe IH (FIO2-6-7{\%}-21{\%}; 180 s cycle) or sham IH daily for 4 or 8 weeks. After exposures, EE was evaluated while mice were kept under normoxia for 5 weeks and organ histology was evaluated. Results: EE was not decreased by IH. However, visceral white adipocyte size after normoxic recovery was significantly increased in severe IH in an intensity-dependent manner. Conclusion: Our hypothesis that IH would decrease EE was not corroborated. However, IH and normoxic recovery seem to promote severity-dependent enlargement of visceral adipocytes, likely reflecting altered energy preservation mechanisms induced by IH.",
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Intermittent hypoxia, energy expenditure, and visceral adipocyte recovery. / Umeda, Akira; Miyagawa, Kazuya; Mochida, Atsumi; Takeda, Hiroshi; Takeda, Kotaro; Okada, Yasumasa; Gozal, David.

In: Respiratory Physiology and Neurobiology, Vol. 273, 103332, 02.2020.

Research output: Contribution to journalArticle

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AU - Umeda, Akira

AU - Miyagawa, Kazuya

AU - Mochida, Atsumi

AU - Takeda, Hiroshi

AU - Takeda, Kotaro

AU - Okada, Yasumasa

AU - Gozal, David

PY - 2020/2

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