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• W2009808537 abstract "MORIKAWA, T., S. SAGAWA, R. TORII, Y. ENDO, F. YAMAZAKI, and K. SHIRAKI. Hypovolemic intolerance to lower body negative pressure in female runners. Med. Sci. Sports Exerc., Vol. 33, No. 12, 2001, pp. 2058–2064. Purpose An attenuated baroreflex response and orthostatic intolerance have been reported in endurance-trained male athletes; however, it is still unknown whether this occurs also in females. The purpose of the present study was to examine whether endurance exercise-trained women had a predisposition to orthostatic compromise, and if so, what causative factor(s) may induce orthostatic intolerance. Methods We studied cardiovascular and hormonal responses to graded lower body negative pressure (LBNP) (0 to −60 mm Hg) in 26 middle-distance female runners (18.6 ± 0.1 yr) as the exercise-trained (ET) subjects and 23 age-matched untrained (UT) control subjects. On the basis of the occurrence of syncope episodes during LBNP, ET and UT subjects were further allocated to two groups; ET with presyncope (ET+syncope) and without presyncope (ET-syncope) and UT with presyncope (UT+syncope) and without presyncope (UT-syncope). Results Occurrence of presyncope episodes during LBNP was higher in ET (65.4%, P < 0.05) than that for UT (34.8%). Leg compliance was higher (P < 0.05) in ET than in UT. LBNP reduced stroke volume (SV) more (P < 0.05), increased heart rate (HR) higher (P < 0.05), and increased forearm vascular resistance (FVR) more in ET+syncope as compared with the other groups. Response of vasoactive hormones to LBNP was higher in ET+syncope (P < 0.05) than that of the other groups except for norepinephrine (NE); high in both ET+syncope and UT+syncope. The relationship between SV and NE, an index of sympathetic neuronal response, had no training-related changes during LBNP. Conclusion We conclude that exercise-trained females have a high incidence of orthostatic intolerance during LBNP, with a greater reduction of SV independent of changes in baroreflex and neurohumoral function. A lower incidence of LBNP intolerance in UT may be accounted for by a lower reduction of SV during LBNP. An increase in leg compliance in the exercise-trained females may play an important role in inducing pronounced reduction of SV and hence the intolerance to LBNP." @default.
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• W2009808537 title "Hypovolemic intolerance to lower body negative pressure in female runners" @default.
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• W2009808537 doi "https://doi.org/10.1097/00005768-200112000-00013" @default.
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