Abstract
With aging, there is a reduction in mitochondrial activity, and several changes occur in the body composition, including increased adiposity. The dysfunction of mitochondrial activity causes changes and adaptations in tissue catabolic characteristics. Among them, we can mention brown adipose tissue (BAT). BAT’s main function is lipid oxidation for heat production, hence playing a role in adaptive thermogenesis induced by environmental factors such as exercise. It is known that exercise causes a series of metabolic changes, including loss body fat; however, there is still no consensus in the academic community about whether both strength and aerobic exercise equally reduces adiposity. Therefore, this study aimed to evaluate the effects of strength training and aerobic exercise regimes on adiposity, proteins regulating mitochondrial activity, and respiratory complexes in BAT of old rats. The rats were divided in two control groups: young control (YC; N = 5), and old control (OC; N = 5), and two exercise groups: strength training (OST; N = 5), and aerobic treadmill training (OAT; N = 5). Rats were subjected to an 8-week exercise regime, and their body composition parameters were evaluated (total body weight, adiposity index, and BAT weight). In addition, mitochondrial biogenesis proteins (PGC-1α, SIRT1, and pAMPK) and respiratory chain activity (complexes I, II/III, III, and IV) were evaluated. Results showed that OST and OAT exercise protocols significantly increased the mitochondrial regulatory molecules and respiratory chain activity, while body fat percentage and adiposity index significantly decreased. Taken together, both OST and OAT exercise increased BAT weight, activity of respiratory complexes, and regulatory proteins in BAT and equally reduced body adiposity.
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Abbreviations
- AMPK:
-
Adenosine monophosphate-activated protein kinase
- BAT:
-
Brown adipose tissue
- DTT:
-
Dithiothreitol
- EDTA:
-
Ethylenediaminetetraacetic acid
- NADH:
-
Nicotinamide adenine dinucleotide dehydrogenase
- NRF-1:
-
Nuclear respiratory factor 1
- NRF-2:
-
Nuclear respiratory factor 2
- OAT:
-
Aerobic treadmill training
- OC:
-
Old control
- OST:
-
Strength training
- PGC-1α:
-
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha
- PMSF:
-
Phenylmethylsulfonyl fluoride
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SIRT1:
-
Sirtuin 1
- SNS:
-
Sympathetic nervous system
- VEGF:
-
Vascular endothelial growth factor
- YC:
-
Young control
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Acknowledgements
This work was supported by the Universidade do Extremo Sul Catarinense, Criciuma, SC, Brazil. The Authors thanks professor Fernando Antonio Basile Colugnati of the Health Graduate Program of Juiz de Fora Federal University for statistical support.
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The study protocol was reviewed and approved by the local ethics committee according to the Guidelines for Animal Care and Experimentation (number 16/2013).
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Thirupathi, A., da Silva Pieri, B.L., Queiroz, J.A.M.P. et al. Strength training and aerobic exercise alter mitochondrial parameters in brown adipose tissue and equally reduce body adiposity in aged rats. J Physiol Biochem 75, 101–108 (2019). https://doi.org/10.1007/s13105-019-00663-x
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DOI: https://doi.org/10.1007/s13105-019-00663-x