ArticleScientific reports2019
Energy expenditure for isometric contractions of right and left ventricular trabeculae over a wide range of frequencies at body temperature.
Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Measurement and control of mechanics of cardiac trabeculae secured by light-curable hydrogel.Experimental physiology · 2026Article
- Beyond the left ventricle: modern echocardiographic assessment of right ventricular function in tricuspid regurgitation.Cardiovascular ultrasound · 2025Review
- Danicamtiv increases cardiac mechanical efficiency.The Journal of physiology · 2025Article
- Cardiac muscle contracts more efficiently at lower contraction frequencies.Experimental physiology · 2025Article
- Human Cardiac Mesenchymal Stromal Cells From Right and Left Ventricles Display Differences in Number, Function, and Transcriptomic Profile.Frontiers in physiology · 2020Article
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Authors and funding
6 authors.
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Abstract
We studied the energy expenditure of isometric contractions using both right-ventricular (RV) and left-ventricular (LV) trabeculae isolated from the rat heart. The energy expenditure under isometric contraction presents entirely as heat liberation. Preparations were challenged to perform at various rates of energy demand while accounting for their inevitable time-dependent decline of performance. They were electrically stimulated to contract at 37 °C with a frequency order (between 0.1 Hz and 10 Hz) dictated by a fully-balanced Latin-Square experimental design. We measured, simultaneously, their stress production and heat output. As functions of stimulus frequency, active stress and heat were not significantly different between RV and LV trabeculae. However, contraction kinetics, indexed as the maximal rate of rise and fall of twitch, were lower in the LV trabeculae. The ratio of heat to stress was greater in the LV trabeculae, suggesting that the economy of contraction of the LV trabeculae is lower. Their lower economy became more pronounced at high stimulus frequencies. Our results allow us to assess whether slowing of kinetics is a causative mechanism for improvement of economy of contraction.
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