{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,31]],"date-time":"2026-10-31T02:36:19Z","timestamp":1793414179286,"version":"4.5.0"},"reference-count":29,"publisher":"American Physiological Society","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Applied Physiology"],"published-print":{"date-parts":[[1999,2,1]]},"abstract":"<jats:p> The purpose of this study was twofold: 1) to determine whether at high altitude cerebral blood flow (CBF) as assessed during CO<jats:sub>2<\/jats:sub> inhalation and during hyperventilation in subjects with acute mountain sickness (AMS) was different from that in subjects without AMS and 2) to compare the CBF as assessed under similar conditions in Sherpas at high altitude and in subjects at sea level. Resting control values of blood flow velocity in the middle cerebral artery ( V <jats:sub>MCA<\/jats:sub>), pulse oxygen saturation ([Formula: see text]), and transcutaneous [Formula: see text] were measured at 4,243 m in 43 subjects without AMS, 17 subjects with AMS, 20 Sherpas, and 13 subjects at sea level. Responses of CO<jats:sub>2<\/jats:sub> inhalation and hyperventilation on V <jats:sub>MCA<\/jats:sub>,[Formula: see text], and transcutaneous[Formula: see text] were measured, and the cerebral vasomotor reactivity (VMR = \u0394 V <jats:sub>MCA<\/jats:sub>\/[Formula: see text]) was calculated as the fractional change of V <jats:sub>MCA<\/jats:sub> per Torr change of [Formula: see text], yielding a hypercapnic VMR and a hypocapnic VMR. AMS subjects showed a significantly higher resting control V <jats:sub>MCA<\/jats:sub> than did no-AMS subjects (74 \u00b1 22 and 56 \u00b1 14 cm\/s, respectively; P &lt; 0.001), and[Formula: see text] was significantly lower (80 \u00b1 8 and 88 \u00b1 3%, respectively; P &lt; 0.001). Resting control V <jats:sub>MCA<\/jats:sub> values in the sea-level group (60 \u00b1 15 cm\/s), in the no-AMS group, and in Sherpas (59 \u00b1 13 cm\/s) were not different. Hypercapnic VMR values in AMS subjects were 4.0 \u00b1 4.4, in no-AMS subjects were 5.5 \u00b1 4.3, in Sherpas were 5.6 \u00b1 4.1, and in sea-level subjects were 5.6 \u00b1 2.5 (not significant). Hypocapnic VMR values were significantly higher in AMS subjects (5.9 \u00b1 1.5) compared with no-AMS subjects (4.8 \u00b1 1.4; P &lt; 0.005) but were not significantly different between Sherpas (3.8 \u00b1 1.1) and the sea-level group (2.8 \u00b1 0.7). We conclude that AMS subjects have greater cerebral hemodynamic responses to hyperventilation, higher V <jats:sub>MCA<\/jats:sub>resting control values, and lower[Formula: see text] compared with no-AMS subjects. Sherpas showed a cerebral hemodynamic pattern similar to that of normal subjects at sea level. <\/jats:p>","DOI":"10.1152\/jappl.1999.86.2.681","type":"journal-article","created":{"date-parts":[[2017,12,22]],"date-time":"2017-12-22T07:51:26Z","timestamp":1513929086000},"page":"681-686","source":"Crossref","is-referenced-by-count":57,"title":["Cerebral vasomotor reactivity at high altitude in humans"],"prefix":"10.1152","volume":"86","author":[{"given":"Gerard F. 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