Effects of short-term high-intensity interval and continuous exercise training on body composition and cardiac function in obese sarcopenic rats
LIFE SCIENCES
Authors: Franca, Guilherme de Oliveira; Frantz, Eliete Dalla Corte; Magliano, D'Angelo Carlo; Bargut, Thereza Cristina Lonzetti; Fragoso, Vinicius Sepulveda; Silvares, Raquel Rangel; Daliry, Anissa; do Nacimento, Alessandro Rodrigues; Borges, Juliana Pereira
Abstract
Aim: We investigated the effects of high-intensity interval and continuous short-term exercise on body composition and cardiac function after myocardial ischemia-reperfusion injury (IRI) in obese rats. Methods: Rats fed with a standard chow diet (SC) or high-fat diet (HFD) for 20 weeks underwent systolic blood pressure (SBP), glycemia and dual-energy X-ray absorptiometry analyses. Then, animals fed with HFD were subdivided into three groups: sedentary (HFD-SED); moderate-intensity continuous training (HFD-MICT); and high-intensity interval training (HFD-HIIT). Exercised groups underwent four isocaloric aerobic exercise sessions, in which HFD-MICT maintained the intensity continuously and HFD-HIIT alternated it. After exercise sessions, all groups underwent global IRI and myocardial infarct size (IS) was determined histologically. Fat and muscle mass were weighted, and protein levels involved in muscle metabolism were assessed in skeletal muscle. Results: HFD-fed versus SC-fed rats reduced lean body mass by 31% (P < 0.001), while SBP, glycemia and body fat percentage were increased by 10% (P = 0.04), 30% (P = 0.006) and 54% (P < 0.001); respectively. HFD-induced muscle atrophy was restored in exercised groups, as only HFD-SED presented lower gastrocnemius (32%; P = 0.001) and quadriceps mass (62%; P < 0.001) than SC. PGC1-alpha expression was 2.7-fold higher in HFD-HIIT versus HFD-SED (P = 0.04), whereas HFD-HIIT and HFD-MICT exhibited 1.7-fold increase in p-mTOR(Ser2481) levels compared to HFD-SED (P = 0.04). Although no difference was detected among groups for IS (P = 0.30), only HFD-HIIT preserved left-ventricle developed pressure after IRI (+0.7 mmHg; P = 0.9). Significance: Short-term exercise, continuous or HIIT, restored HFD-induced muscle atrophy and increased mTOR expression, but only HIIT maintained myocardial contractility following IRI in obese animals.
Visual Object Detector for Cow Sound Event Detection
IEEE ACCESS
Authors: Pandeya, Yagya Raj; Bhattarai, Bhuwan; Lee, Joonwhoan
Abstract
Sound event detection (SED) is a reasonable choice in a number of application domains including cattle sheds, dense forests, or any dark environments where visual objects are usually concealed or invisible. This study presents an autonomous monitoring system based on sound characteristics developed for welfare management in large cattle farms. Two types of artificial audio datasets are prepared: the cow sound event dataset and the UrbanSound8K dataset, which are then used with various sound object detectors for real world implementation. Using a data-driven approach, a conventional convolutional neural network structure with certain improvements is first applied, and from there proceed to a two-stage visual object detection method for audio by treating acoustic signals as an RGB images. The object detection method achieves a higher quantitative evaluation score and more precise qualitative results than previous related studies. We conclude that visual object detection methods are more effective than currently-available CNN architectures for rare sound object detection. Indeed, an artificial data preparation strategy can provide a better method for addressing the problem of data scarcity and the annotation difficulties involved in rare sound event detection.