Fasting and glucose induced thermogenesis in response to three ambient temperatures: a randomized crossover trial in the metabolic syndrome.
MetadataShow full item record
BACKGROUND/OBJECTIVES: Cold exposure increases thermogenesis and could improve insulin sensitivity. We hypothesized a blunted response in the metabolic syndrome (MetS). SUBJECTS/METHODS: Twenty older adults 59?±?10.4 years (with MetS, MetS+, n?=?9; without MetS, MetS-, n?=?11) completed a randomized crossover design of 3.5?h exposures to 20, 25 and 27?°C on three visits. After an hour's rest at the desired temperature, resting metabolic rate (RMR), respiratory quotient (RQ), forearm to fingertip gradients (FFG), and in the ear temperature (IET) were measured over 30?min. An oral glucose tolerance test followed, and serial measurements were continued for 2?h. Venous blood was sampled for clinical chemistry, irisin, and fibroblast growth factor 21(FGF21). A mixed model ANCOVA adjusted data for age, gender, fat mass, fat-free mass and seasonality. RESULTS: There was a significant MetS×temperature interaction where adjusted RMR was significantly higher in MetS+ compared to MetS- by 12% at 20?°C and by 6% at 25?°C, but similar at 27?°C. FFG increased and IET decreased with decreasing temperature to the same extent in both groups. Fasting irisin and FGF21 did not vary with temperature but the former was significantly higher in MetS-. Adjusted postprandial RQ and insulin to glucose ratios were significantly higher at 20?°C relative to 25?°C. Partial correlation analysis of differences between 27 and 20?°C indicated significant positive relationships between fasting as well as postprandial RQ and the respective changes in irisin and FGF21. CONCLUSIONS: There could be an upward shift of the TNZ in MetS+, but this needs reevaluation.
Showing items related by title, author, creator and subject.
An investigation of the physiological and biochemical responses elicited by Panulirus cygnus to harvesting, holding and live transport.Spanoghe, Patrick T. (1996)The western rock lobster (WRL), Panulirus cygnus is a decapod crustacean which is found in abundance in the coastal waters of Western Australia and which supports a major fishery of economic importance for the State, with ...
Acute heat illness in underground miners : the clinical state, haematology, biochemistry and risk factors.Donoghue, Alan M. (2000)Objectives - To examine the incidence, clinical state, personal risk factors, haematology and biochemistry of heat exhaustion cases occurring at a deep underground metalliferous mine. To describe the underground and surface ...
Formation and characteristics of glucose oligomers during the hydrolysis of cellulose in hot-compressed waterYu, Yun (2009)Energy production from fossil fuels results in significant carbon dioxide emission, which is a key contributor to global warming and the problems related to climate change. Biomass is recognized as an important part of ...