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Phys Act Nutr > Volume 25(2); 2021 > Article
Physical Activity and Nutrition 2021;25(2):8-14.
DOI:    Published online June 30, 2021.
Consumption of a high-fat-high-sucrose diet partly diminishes mechanical and structural adaptations of cardiac muscle following resistance training
Kevin Boldt1, Stela Mattiello2, Venus Joumaa1, Jeannine Turnbull3, Paul W.M. Fedak3, Walter Herzog1,4
1Human Performance Laboratory, University of Calgary, Calgary, Canada
2Department of Physical Therapy, Center of Biological and Health Sciences, Federal University of São Carlos, São Carlos, Brazil
3Health Centre, Federal University of Santa Catarina, Florianopolis, Brazil
4Department of Cardiac Sciences, University of Calgary, Calgary, Canada
Received: 12 April 2021   • Revised: 7 June 2021   • Accepted: 24 June 2021
The purpose of this study was to investigate the effects of a high-fat high-sucrose (HFHS) diet on previously reported adaptations of cardiac morphological and contractile properties to resistance training.
Twelve-week-old rats participated in 12-weeks of resistance exercise training and consumed an HFHS diet. Echocardiography and skinned cardiac muscle fiber bundle testing were performed to determine the structural and mechanical adaptations.
Compared to chow-fed sedentary animals, both HFHS- and chow-fed resistance-trained animals had thicker left ventricular walls. Isolated trabecular fiber bundles from chow-fed resistance-trained animals had greater force output, shortening velocities, and calcium sensitivities than those of chow-fed sedentary controls. However, trabeculae from the HFHS resistance-trained animals had greater force output but no change in unloaded shortening velocity or calcium sensitivity than those of the chow-fed sedentary group animals.
Resistance exercise training led to positive structural and mechanical adaptations of the heart, which were partly offset by the HFHS diet.
Key Words: obesity, high-fat high-sucrose diet, cardiac adaptations, resistance exercise, skinned fibers, echocardiography
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