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J Physiol Anthropol. 2018 Feb 21;37(1):6. doi: 10.1186/s40101-018-0166-x.

Seasonal differences in brown adipose tissue density and pulse rate variability in a thermoneutral environment.

Author information

1
Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1 Mukaihata-cho, Fukakusa, Kyoto, 612-8555, Japan.
2
Department of Preventive Medicine and Public Health, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan.
3
Faculty of Health and Sports Science, Juntendo University, 1-1 Hiragagakuendai, Inzai, Chiba, 270-1695, Japan.
4
Faculty of Sports and Health Science, Daito Bunka University, 560 Iwadono, Higashimatsuyama-shi, Saitama, 355-8501, Japan.
5
Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan.
6
Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo, 160-8402, Japan. kyp02504@nifty.com.

Abstract

BACKGROUND:

Brown adipose tissue (BAT) is sympathetically activated and induces thermogenesis during cold exposure, thereby influencing energy expenditure and body fat levels. The very low frequency (VLF) components of pulse rate variability could be a form of thermogenic sympathetic nervous activity, but no clear relationship has yet been reported between VLF activity and BAT density. We therefore aimed to evaluate the association between them.

METHODS:

We enrolled 20 adults in winter and 20 matched adults in summer. We assessed BAT densities based on total hemoglobin concentrations ([total-Hb]) measured with near-infrared time-resolved spectroscopy. We calculated VLF activity from pulse rate variability measurements.

RESULTS:

BAT density ([total-Hb]; winter 70.5 ± 17.0 μM, summer 57.8 ± 18.3 μM) and VLF activity (winter 6.7 ± 0.8, summer 6.1 ± 0.9) were significantly higher in winter than in summer (P < 0.05). However, there was no significant correlation between VLF activity and BAT density in either season.

CONCLUSION:

Each parameter exhibited seasonal variation, but we failed to observe any significant correlations.

KEYWORDS:

Autonomic nervous system; Brown adipose tissue; Near-infrared time-resolved spectroscopy; Seasonality

PMID:
29467034
PMCID:
PMC5822524
DOI:
10.1186/s40101-018-0166-x
[Indexed for MEDLINE]
Free PMC Article

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