2024-03-29T10:58:01Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00022733
2023-11-16T04:45:53Z
499:508:509:1902
A Radio Telemetering System and the Changes of EKG and Heart Rate of the Subjects Engaging in Mountaineering at Greater Altitudes
NAGASAKA, TETSUO
93869
ANDO, SHIGERU
93870
TAKAI, TOSHIYUKI
93871
TAKAGI, KENTARO
93872
1966-11
EKG and heart rate engaging in mountaineering as well as at rest were re- corded by the telemetry on three subjects of the 1965-1966 Nagoya university scientific and mountaineering expedition to the Andes at altitudes of 4200 to 7000 m (near the summit of Mt. Aconcagua, Argentina). Resting heart rate, 51-61 beats/min at sea level rose to 99-108 beats/min by a quick transition to an altitude (4200 m above sea level), but it became increasingly less during the course of high altitude acclimatization and reached 70-84 beats/min. Daily variation of the resting heart rate, within 12-14 beats/min at sea level, rose to 25-35 beats/ min at an altitude of 5000 m. Heart rate reached 130 beats/ min in subject N., 136 beats/min in subject I. and 163 beats/min in subject O. during engaging in mountaineering at the altitude of 4200-5000 m. The ceiling level of the heart rate seems to be 145 beats/min for the three sujects, and 163 beats/min of subject O. which is 20-25 beats/min above the ceiling level will be explained by another unknown mechanism. Heart rate of subject I. did not exceed 145 beats/ min even in mountaineering at an altitude of 7000 m. Heart rate fell markedly during sleep at 6200 m in all subjects. In subject O., it decreased to the resting heart rate at sea level and with such a marked fall in hesrt rate the subject could not perform strenuous mountaineering next day. Resting EKG of the subject was normal at 4200 m after altitude acclimatization, and as far as the heart r ate was within the ceiling level, there was observed no abnormal events in EKG. With increased heart rate to above 140 beats/min, depression of ST segment, ectopic beats and marked arrhythmia were observed in subject O.
departmental bulletin paper
Nagoya University School of Medicine
1966-11
Nagoya Journal of Medical Science
1
29
93
103
2186-3326
0027-7622
eng
http://www.med.nagoya-u.ac.jp/medlib/nagoya_j_med_sci/291/291.html