Final answer:
Usual stroke rehabilitation intensity is usually not adequate to induce a cardiovascular training effect because it focuses on motor function recovery rather than improving cardiovascular fitness.
Step-by-step explanation:
The statement that the intensity of a usual stroke rehabilitation is adequate to induce a cardiovascular training effect can be considered false. Stroke rehabilitation exercises are typically not aimed at cardiovascular training but rather at improving motor function and addressing deficits caused by the stroke. Cardiovascular training requires a sustained increase in heart rate to strengthen the heart muscle, and the exercises prescribed in standard stroke rehab may not suffice to achieve this effect.
Strokes can indeed be caused by a blood clot (ischemic stroke) or a hemorrhage (hemorrhagic stroke) due to a broken artery. Platelets respond to vascular injury not by losing their nuclei but by adhering to the site of injury, aggregating, and forming a plug to help stop bleeding.
The sinus rhythm is the normal heartbeat, initiated by the sinoatrial node, that is characteristic of a healthy heart. Coronary circulation involves blood flow to and from the heart muscles, pulmonary circulation deals with the exchange of gases in the lungs, and systemic circulation supplies blood to the rest of the body's tissues.