Neurogenic factors affecting ventilatory and circulatory responses to static and dynamic exercise in man.

Initial ventilatory and circulatory responses to dynamic exercise are slowed in the elderly.

To elucidate the characteristics of ventilatory and circulatory responses at the onset of brief and light exercise in the elderly, 13 healthy, elderly men, aged 66.8 yr (mean), exerted bilateral leg extension-flexion movements for only 20 s with a weight around each ankle, with each weight being approximately 2.5% of their body mass. Similar movements were passively performed on the subjects by...

a framework for identifying and prioritizing factors affecting customers’ online shopping behavior in iran

the purpose of this study is identifying effective factors which make customers shop online in iran and investigating the importance of discovered factors in online customers’ decision. in the identifying phase, to discover the factors affecting online shopping behavior of customers in iran, the derived reference model summarizing antecedents of online shopping proposed by change et al. was us...

Disparities in ventilatory and circulatory responses to bicycle and treadmill exercise.

Neural and humoral factors affecting ventilatory response during exercise.

The principle of feedback control is thought to be fundamental for maintaining homeostasis in biological systems. In the respiratory system, constancy of arterial Pcoz, Poz, and pH is also maintained essentially by means of a feedback control system. For the sake of simplicity, let's assume that the respiratory system is regulated by only one controlled variable, Pa~oz. According to control the...

Systemic circulatory responses to hypocapnia in man.

RICHAKDSON, DAVID Mr., HERMES A. KONTOS, A. JARRELL RAPER, AND JOHN L. PATTERSON, JR. Systemic circulatory responses to hypocapnia in man. Am. J. Physiol. !223(6): 1308-1312. 1972.Hypocapnic alkalosis, induced by voluntary hyperventilation in normal man, was associated with increases in cardiac output and in heart rate and decreases in mean arterial blood pressure and in systemic vascular resis...