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Beat-by-beat heart rate (3-lead https://en.wikipedia.org/wiki/Quinapyramine electrocardiogram) and blood pressure were determined throughout via an automated physiological monitor (Cardiocap 5, GE Datex-Ohmeda, Madison, WI, USA). Fasting basal venous blood samples collected during Studies 1 and 2 (representing identical interventions) were combined and analysed for circulating concentrations of factors previously associated with insulin sensitivity and/or ��-AR thermogenic function. Blood (?20 ml preserved with K3 ethylenediaminetetraacetic acid, plus ?5 ml preserved with ethylene glycol tetraacetic acid/glutathione) was collected in chilled tubes, placed immediately on ice and centrifuged within 60 min of collection to isolate plasma. Plasma samples were stored at �C80��C until analysis. Plasma catecholamine concentrations were analysed in duplicate using high-performance liquid chromatography. Enzyme-linked immunosorbent assays (ELISA) were used to measure, in duplicate, plasma concentrations of insulin, adiponectin and PEDF (all Millipore Corporation, Billerica, MA, USA), http://www.selleckchem.com/products/MS-275.html and non-esterified fatty acids (NEFA; Wako Diagnostics, Richmond, VA, USA). Fat mass and fat-free mass were measured using dual-energy x-ray absorptiometry (DXA-IQ; Lunar Radiation Corp., Madison, WI, USA; software version 4.1). was determined with a metabolic cart (Parvo Medics, Sandy, UT, USA) during incremental cycle ergometer exercise (20�C25 W min?1) to volitional fatigue, as previously described (Bell et al. 1999a,b, 2003a). These http://www.selleckchem.com/products/GDC-0449.html were controlled, repeated measures studies. Accordingly, in Study 1 the influence of sprint interval training on insulin sensitivity (glucose infusion rate) was examined via two-way (sprint training vs. single bout vs. sedentary control) repeated measures (before vs. after) analysis of variance (ANOVA). Similarly, in Study 2 the influence of sprint interval training on the thermogenic response to ��-AR stimulation (% increase in energy expenditure above rest) was also examined by two-way repeated measures ANOVA. Resting energy expenditure was positively associated with fat-free mass (r= 0.95, P 98%). No subject completed