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• W2120051502 endingPage "E559" @default.
• W2120051502 startingPage "E551" @default.
• W2120051502 abstract "In humans, nonexercise activity thermogenesis (NEAT) increases with positive energy balance. The mediator of the interaction between positive energy balance and physical activity is unknown. In this study, we address the hypothesis that orexin A acts in the hypothalamic paraventricular nucleus (PVN) to increase nonfeeding-associated physical activity. PVN-cannulated rats were injected with either orexin A or vehicle during the light and dark cycle. Spontaneous physical activity (SPA) was measured using arrays of infrared activity sensors and night vision videotaped recording (VTR). O(2) consumption and CO(2) production were measured by indirect calorimetry. Feeding behavior was assessed by VTR. Regardless of the time point of injection, orexin A (1 nmol) was associated with dramatic increases in SPA for 2 h after injection (orexin A: 6.27 +/- 1.95 x 10(3) beam break count, n = 24; vehicle: 1.85 +/- 1.13 x 10(3), n = 38). This increase in SPA was accompanied by compatible increase in O(2) consumption. Duration of feeding was increased only when orexin A was injected in the early light phase and accounted for only 3.5 +/- 2.5% of the increased physical activity. In a dose-response experiment, increases in SPA were correlated with dose of orexin A linearly up to 2 nmol. PVN injections of orexin receptor antagonist SB-334867 were associated with decreases in SPA and attenuated the effects of PVN-injected orexin A. Thus orexin A can act in PVN to increase nonfeeding-associated physical activity, suggesting that this neuropeptide might be a mediator of NEAT." @default.
• W2120051502 created "2016-06-24" @default.
• W2120051502 creator A5025838203 @default.
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• W2120051502 creator A5044396459 @default.
• W2120051502 creator A5075859897 @default.
• W2120051502 creator A5087886551 @default.
• W2120051502 date "2004-04-01" @default.
• W2120051502 modified "2023-10-04" @default.
• W2120051502 title "Orexin A (hypocretin 1) injected into hypothalamic paraventricular nucleus and spontaneous physical activity in rats" @default.
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• W2120051502 doi "https://doi.org/10.1152/ajpendo.00126.2003" @default.
• W2120051502 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14656716" @default.
• W2120051502 hasPublicationYear "2004" @default.
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