The Effects of Resistance Exercise on the Cardiorespiratory Tissue of Rats with Parkinson's Disease.

Parkinson's Disease (PD) affects the cardiorespiratory system, causing an increase in the left ventricular mass in the heart and respiratory muscle weakness in relation to healthy individuals. The objective of this study was to investigate the effects of progressive resistive physical exercise on the vertical ladder on the histomorphometry of cardiac tissue and respiratory muscles in rats with PD. Seventy male Wistar rats, aged 40 days old, were divided into Parkinson's (PD) and Sham (SH) groups; they were also subdivided into groups that performed progressive resistive physical exercise on the vertical ladder Before Surgery (ExBS), After Surgery (ExAS), and Before and After Surgery (ExBAS).

Behavioral characterization of the alarm reaction and anxiolytic-like effect of acute treatment with fluoxetine in piauçu fish.

In Ostariophysan fish, the detection of the alarm substance liberated into the water as a consequence of an attack by a predator elicits an alarm reaction or anti-predatory behavior. In this study, experiments were performed to: (i) describe and quantitatively characterize the behavioral and ventilatory responses in piauçu fish (Leporinus macrocephalus), individually and as part of a school, to conspecific alarm substance (CAS) and; (ii) test the effect of acute fluoxetine treatment on alarm reaction. Histological analysis revealed the presence of club cells in the intermediate and superficial layers of the epidermis.

Stressful and behavioral conditions that affect reversible cardiac arrest in the Nile tilapia, Oreochromis niloticus (Teleostei).

The objective of the present investigation was to study the reversible cardiac arrest (RCA) to visual stimuli in the unrestrained Nile tilapia (Oreochromis niloticus) as well as the modulation of this response and its behavioral component (arousal/orientation or startle response) by external and internal factors that interfere with alertness and emotionality. The study was preceded by the determination of the autonomic receptors that contribute to the establishment of the heart rate (HR) and the RCA. Systemic injection of atropine and propranolol showed that a double cardiac autonomic control is present in the tilapia.