Zunnunov Z P
Fiziol Zh SSSR Im I M Sechenova. 1992 Jun;78(6):18-24.
In heat discomfort, physically trained subjects had a high and stable physical working ability (PWA) whereas untrained subjects revealed a considerable decline of the parameter. A lesser work was performed with a greater tension of the cardiorespiratory system. The data obtained suggest a high and stable PWA is one of the main criteria of the organism's adaptation to hot climate conditions of the arid zone.