Circulatory Adjustments to Exercise and Heat Stress

Students of this complex field have excellent resources available. A compre­ hensive 1965 chapter by Thauer (89) gives access to the earlier literature and provides a synthesis of knowledge regarding both central and periph­ eral cardiovascular adjustments to thermal stress. Rowell's 1974 review (75) and forthcoming handbook chapter (78) continue this tradition of compre­ hensive and analytical treatment of the SUbject, including the major ad­ vances in understanding of how cardiac output and its distribution are controlled when the stresses of exercise and heat are combined. Useful recent books include Man And Animals in Hot Environments (42), a system­ atic development that will help to introduce the field; a group of essays (6) emphasizing the control mechanisms involved in temperature regulation; a general overview of thermal physiology (41), with chapters devoted to particular cardiovascular aspects; and a compilation of papers from a sym­ posium on temperature regulation during exercise (60). A major component of the cardiovascular response to heat stress in humans is discussed in a recent review of the subject of active cutaneous vasodilatation (77). Riedel & Iriki (1979) discuss autonomic nervous system activity asso­ ciated with integration of thermal and other afferent signals into a ftnal common neural outflow that governs cardiovascular effectors (72). Sciaraffa et al (81) have compiled literature (1968-1977) on acclimatization to heat. A still useful reference on the disorders that accompany hyperthermia is the 1964 book by Liethead & Lind (53). Finally, papers from a number of informative symposia have been published in Federation Proceedings, in­ cluding two that will bring scholars up to date on the neurophysiology of