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Effect of combined thermal and electrical muscle stimulation on cardiorespiratory fitness and adipose tissue in obese individuals.

European journal of preventive cardiology (2013-03-22)
Espen Rostrup, Grete Slettom, Reinhard Seifert, Bodil Bjørndal, Rolf K Berge, Jan Erik Nordrehaug
ABSTRACT

To better understand how prolonged electrical muscle stimulation can improve cardiorespiratory risk markers in obese subjects, we investigated the effect of prolonged combined thermal and electrical muscle stimulation (cTEMS) on peak oxygen consumption (VO2peak) and body composition with subsequent lipolytic and mitochondrial activity in adipocytes. Eleven obese (BMI ≥ 30 kg/m(2)) individuals received cTEMS in three 60-minute sessions per week for 8 weeks. Activity levels and dietary habits were kept unchanged. Before and after the stimulation period, functional capacity was assessed by VO2peak, and body composition was analysed. Lipolytic activity was determined in abdominal adipose tissue by 24 hours of microdialysis on a sedentary day, and adipose tissue biopsies were taken for the gene expression analysis. Eight weeks of cTEMS significantly increased VO2peak from 28.9 ± 5.7 to 31.7 ± 6.2 ml/kg/min (p < 0.05), corresponding to an average increase of 1.2% per week. Oxygen uptake and work capacity also increased at the anaerobic threshold. Mean microdialytic glycerol concentration over 24 hours, an index of sedentary lipolytic activity, increased from 238 ± 60 to 306 ± 55 µM (p < 0,0001), but no significant changes in body composition were observed. In addition, PGC-1α and carnitine-palmitoyltransferase-2 mRNAs were significantly upregulated in subcutaneous abdominal adipose tissue. In obese individuals with unchanged lifestyles, 8 weeks of cTEMS significantly improved functional capacity towards a higher fatigue resistance. This increase also gave rise to elevated lipolytic activity and increased mitochondrial activity in abdominal adipose tissue.

MATERIALS
Product Number
Brand
Product Description

SAFC
Cholesterol, Plant-Derived, SyntheChol®, NF, Ph. Eur., JP
Sigma-Aldrich
Cholesterol, Sigma Grade, ≥99%
Sigma-Aldrich
Cholesterol, powder, BioReagent, suitable for cell culture, ≥99%
Sigma-Aldrich
Cholesterol, from sheep wool, ≥92.5% (GC), powder
Sigma-Aldrich
Cholesterol, tested according to Ph. Eur.
Sigma-Aldrich
SyntheChol® NS0 Supplement, 500 ×, synthetic cholesterol, animal component-free, aqueous solution, sterile-filtered, suitable for cell culture
Supelco
Cholesterol solution, certified reference material, 10 mg/mL in chloroform
SAFC
Cholesterol, from sheep wool, Controlled origin, meets USP/NF testing specifications
Supelco
Cholesterol, Pharmaceutical Secondary Standard; Certified Reference Material