title: Developmental Effects Determine Submaximal Arterial Oxygen Saturation in Peruvian Quechua.
abstract: Kiyamu, Melisa, Fabiola León-Velarde, María Rivera-Chira, Gianpietro Elías, and Tom D. Brutsaert. Developmental effects determine submaximal arterial oxygen saturation in Peruvian Quechua. High Alt Med Biol 16, 138-146, 2015.--Andean high altitude natives show higher arterial oxygen saturation (Sao(2)) during exercise in hypoxia, compared to acclimatized sojourners. In order to evaluate the effects of life-long exposure to high altitude on Sao(2), we studied two groups of well-matched, self-identified Peruvian Quechua natives who differed in their developmental exposure to hypoxia before and after a 2-month training period. Male and female volunteers (18-35 years) were recruited in Lima, Peru (150 m). The two groups were: a) Individuals who were born and raised at sea-level (BSL, n=34) and b) Individuals who were born and raised at high altitude (BHA, n=32), but who migrated to sea-level as adults (>16 years old). Exercise testing was conducted using a submaximal exercise protocol in normobaric hypoxia in Lima (BP=750 mmHg, Fio(2)=0.12), in order to measure Sao(2) (%), ventilation (VE L/min) and oxygen consumption (Vo(2), L/min). Repeated-measures ANOVA, controlling for VE/VO(2) (L/min) and sex during the submaximal protocol showed that BHA maintained higher Sao(2) (%) compared to BSL at all workloads before (p=0.005) and after training (p=0.017). As expected, both groups showed a decrease in Sao(2) (%) (p<0.001), as workload increased. Resting Sao(2) levels were not found to be different between groups. The results suggest that developmental exposure to altitude contributes to the maintenance of higher Sao(2) levels during submaximal exercise at hypoxia.
authors.affiliation: 1 Departamento de Ciencias Biológicas y Fisiológicas, Universidad Peruana Cayetano Heredia , Urb. San Martín de Porres, Peru .
authors.forename: Melisa
authors.initials: M
authors.lastname: Kiyamu
authors.affiliation: 1 Departamento de Ciencias Biológicas y Fisiológicas, Universidad Peruana Cayetano Heredia , Urb. San Martín de Porres, Peru .
authors.forename: Fabiola
authors.initials: F
authors.lastname: León-Velarde
authors.affiliation: 1 Departamento de Ciencias Biológicas y Fisiológicas, Universidad Peruana Cayetano Heredia , Urb. San Martín de Porres, Peru .
authors.forename: María
authors.initials: M
authors.lastname: Rivera-Chira
authors.affiliation: 1 Departamento de Ciencias Biológicas y Fisiológicas, Universidad Peruana Cayetano Heredia , Urb. San Martín de Porres, Peru .
authors.forename: Gianpietro
authors.initials: G
authors.lastname: Elías
authors.affiliation: 2 Department of Exercise Science, Syracuse University , Syracuse, New York.
authors.forename: Tom D
authors.initials: TD
authors.lastname: Brutsaert
mesh_terms: D000064:Acclimatization / Q000502:physiology; D000293:Adolescent; D000328:Adult; D000531:Altitude; D000532:Altitude Sickness / Q000378:metabolism*; D005080:Exercise Test; D005260:Female; D006801:Humans; D007199:Indians, South American; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010568:Peru / Q000208:ethnology; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D055815:Young Adult
keywords: adaptation; development; hypoxia; saturation