title: [Human tolerance to +Gz acceleration during heating].
abstract: Eighty-six measurements of individual tolerance of 25 healthy test subjects to +Gz accelerations were carried out at two body temperatures. At moderate heating (body temperature 37.5+/-0.2degreesC) acceleration tolerance decreased by 1.4 g (maximally by 3 g) without an antigravity suit and by 0.5 g with an antigravit suit. In case of simulated poor fitting of the suit the tolerance decrease was 1.1 g. At high heating (body temperature 38.0+/-0.2degreesC) the decrease was great (2.1 g). In some cases centrifugation was terminated because of poor tolerance to hyperthermia. The regression analysis suggests that at body temperature of 37.3degreesC the acceleration tolerance decreases in some individuals only and at 37.6degreesC and over it declines in most subjects. The correlation between the level of water losses (0.8--2.4% of body weight) and decline in +Gz tolerance was low (r=0.33) and insignificant. The resulting data allow practical recommendations in relation to acrobatic flights in hot climate.
mesh_terms: D000054:Acceleration; D000222:Adaptation, Physiological; D000328:Adult; D006358:Hot Temperature; D006801:Humans; D008297:Male
vernacular_title: Perenosimost' chelovekom uskoreniĭ napravleniia +Gz v usloviiakh peregrevaniia organizma