PubMed · 3849241
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K Tormå. 1985-04-25. [Dramatic exercise in mountain rescue].. https://pubmed.ncbi.nlm.nih.gov/3849241/
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BACKGROUND: This research was conducted to determine whether the depolarization and repolarization cardiac process of children born at high altitude differs from that of children born at lower altitudes. METHODS: We studied three groups of 30 healthy newborns in the Venezuelan Andes. Group 3500 m consisted of infants born at 3500 m above sea level; Group 3000 m of infants born at 3000 m above sea level and Group 1600 m of infants born at 1600 m above sea level. Conventional 12-lead electrocardiograms were recorded in the 90 newborns. Corrected QT interval, duration from the peak to the end of the T wave, dispersion of QT interval and of the final portion of T wave and heart rate were computed in each subject. RESULTS: The findings of the present study show that infants born at high altitude (Groups 3500 and 3000 m) had a significantly longer corrected QT interval and a significantly shorter peak-to-end of T wave interval. Neither the heart rate nor the indexes of dispersion of the depolarization-repolarization process revealed abnormal values or significant differences among the groups. CONCLUSIONS: These results suggest that the depolarization and repolarization cardiac process of infants born at high altitude differs from that of children born at lower altitudes.
Cloud and rainwater samples have been collected at a high elevation site in the Vosges Mountains. An automated collection system has been used to collect bulk cloudwater and small cloudwater droplets. Bulk cloudwater concentrations were up to 10 times more concentrated than rainwater concentrations. Small clouddroplets showed generally higher concentrations than bulk cloudwater. Nevertheless, the enrichment factors depend on the compounds under study and appear to be related to the composition of the cloud condensation nuclei forming small or large clouddroplets. Principal component analysis and factor analysis were applied to the collected datasets and confirmed the influence of the cloud condensation nuclei on the composition difference between small and large cloudwater droplets.
Seasonality of births has been related to multiple factors, including environmental, biological and sociocultural ones, in populations of diverse geographic and cultural origin. However, the relationship between this variable of bioanthropologic interest and geographic altitude has not been adequately explored. The aim of this study was to analyse the monthly distribution pattern of birth rates in Jujeño (north-west Argentina) populations located at different geographic altitude levels. Data were provided by the Statistical Reports on Liveborns (n = 110,404) in the province of Jujuy, 1985-1992. Records were grouped by birthplace into the four geographic regions of the province: Ramal (350 m.a.s.l.), Valle (1200 m.a.s.l.), Quebrada (2500 m.a.s.l.) and Puna (3500 m.a.s.l.). Henry's coefficients of seasonality were estimated. A chi-square test for goodness of fit (chi2) was used to identify statistically significant seasonal variations. Edwards' test was used to detect simple harmonic cycles in birth distribution. Statistically significant seasonal patterns were found in the four geographic regions and they respond to a cyclic model of simple harmonic variation. The greatest Henry coefficients were observed in spring and summer in the higher regions (Puna and Quebrada). whereas they were seen in autumn and winter in the lowlands (Valle and Ramal). It is suggested that these patterns reflect the influence of environmental and socioeconomic altitude-related factors and inter-regional cultural diversity, rather than the influence of geographical altitude per se.