Korean Journal of Exercise Nutrition (운동영양학회지)

한국운동영양학회
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Consumption of a high-fat-high-sucrose diet partly diminishes mechanical and structural adaptations of cardiac muscle following resistance training

  • Boldt, Kevin (Human Performance Laboratory, University of Calgary) ;
  • Mattiello, Stela (Department of Physical Therapy, Center of Biological and Health Sciences, Federal University of Sao Carlos) ;
  • Joumaa, Venus (Human Performance Laboratory, University of Calgary) ;
  • Turnbull, Jeannine (Health Centre, Federal University of Santa Catarina) ;
  • Fedak, Paul W.M. (Health Centre, Federal University of Santa Catarina) ;
  • Herzog, Walter (Human Performance Laboratory, University of Calgary)
  • Received : 2021.04.12
  • Accepted : 2021.06.24
  • Published : 2021.06.30
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Abstract

[Purpose] 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. [Methods] 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. [Results] 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. [Conclusion] Resistance exercise training led to positive structural and mechanical adaptations of the heart, which were partly offset by the HFHS diet.

Keywords

References

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