Restan Alejandro Zamora, Camacho Aparecido Antonio, Zacché Evandro, Canola Raphaela Arantes Marques, Silva Samara Beretta Gomes, Braz Jaislane Bastos, Silva-Filho Jorge Cardoso da, Cerqueira Juliana Aparecida, Loureiro Bruna Agy, Funnicelli Michelli Inacio Gonçalves, Pinheiro Daniel Guariz, Ferraz Guilherme Camargo
Department of Animal Morphology and Physiology, Laboratory of Pharmacology and Equine Exercise Physiology (LAFEQ), School of Agricultural and Veterinarian Sciences (FCAV), São Paulo State University (UNESP), Jaboticabal 14884-900, São Paulo, Brazil.
Department of Clinics and Surgery, School of Agricultural and Veterinarian Sciences (FCAV), São Paulo State University (UNESP), Jaboticabal 14884-900, São Paulo, Brazil.
Animals (Basel). 2021 Dec 30;12(1):73. doi: 10.3390/ani12010073.
This research focuses on the adjustments in systolic and diastolic functions that are not fully understood in dogs submitted to athletic training. Beagle dogs carried out an endurance training program (ETP) prescribed from the external training load, corresponding to 70-80% of the lactate threshold (VLT) velocity. Eighteen dogs were randomly assigned to two groups: control (C, = 8), active dogs that did not perform any forced exercise, and trained (T, = 10), submitted to the ETP during eight weeks. All dogs were evaluated before and after the ETP period using two-dimensional echocardiography, M-mode, Doppler, and two-dimensional speckle tracking. A principal component analysis (PCA) of the echocardiographic variables was performed. The ETP improved the left ventricular internal dimension at the end of diastole (LVDd), the left ventricular internal dimension at the end of diastole to aorta ratio (LVDd: Ao), and the strain rate indices. PCA was able to capture the dimensionality and qualitative echocardiography changes produced by the ETP. These findings indicated that the training prescribed based on the lactate threshold improved the diastolic and systolic functions. This response may be applied to improve myocardial function, promote health, and mitigate any injuries produced during heart failure.
本研究聚焦于接受运动训练的犬类中尚未被充分理解的收缩和舒张功能的调整。比格犬进行了一项根据外部训练负荷规定的耐力训练计划（ETP），该负荷相当于乳酸阈值（VLT）速度的70 - 80%。18只犬被随机分为两组：对照组（C，n = 8），即不进行任何强制运动的活动犬；训练组（T，n = 10），在八周内接受ETP训练。在ETP训练期前后，使用二维超声心动图、M型、多普勒和二维斑点追踪技术对所有犬进行评估。对超声心动图变量进行了主成分分析（PCA）。ETP改善了舒张末期左心室内径（LVDd）、舒张末期左心室内径与主动脉比值（LVDd: Ao）以及应变率指标。PCA能够捕捉ETP所产生的维度和定性超声心动图变化。这些发现表明，基于乳酸阈值规定的训练改善了舒张和收缩功能。这种反应可用于改善心肌功能、促进健康以及减轻心力衰竭期间产生的任何损伤。
