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H Donoso

Publications and source records attributed to H Donoso.

At least 19 recordsLinked to original sources
PubMed1997

[Measurement of maximal oxygen uptake in a Chilean population sample].

BACKGROUND: Maximal oxygen uptake is considered by the International Biological Programme as the international standard of cardiorespiratory adequacy and physical condition. AIM: To measure maximal oxygen uptake in normal Chilean subjects, to establish normal reference values. SUBJECTS AND METHODS: Maximal oxygen uptake was measured in 2,203 subjects (451 women) aged 7 to 66 years old, during maximal exercise in a cyclo-ergometer or treadmill. This sample included trained sportsmen. RESULTS: Maximal oxygen uptake in men was 3.4 +/- 0.8 Vmin (range 1.1 to 5.6) or 55.2 +/- 9.2 ml/kg/min (range 23.8 to 83.2). In women, the figures were 2.55 +/- 0.55 l/min (range 0.87 to 3.82) or 47.5 +/- 8.0 ml/kg/min (range 20.8 to 76.3). These values decrease 0.65 ml/kg/min per year of age. CONCLUSIONS: These values can be useful as a normal reference for epidemiological, clinical or sportive purposes.

Adolescent↗
PubMed1988

Maximal oxygen uptake in Chilean workers of normal nutritional status.

Maximum oxygen uptake (VO2max) was measured directly and predicted from cardiac frequency measurements in 54 healthy Chilean industrial workers aged 20 to 55 years, together with assessment of their dietary intake, body composition and blood chemistry. Measurement of VO2 was performed on a motor-driven treadmill. The predicted VO2max was obtained using a cycle ergometer by two methods: 1) the Astrand-Ryhming nomogram and 2) the linear relationship between "steady state" heart rate (HR) and submaximum work, with subsequent extrapolation to "maximum" heart rate. Extrapolation of the HR/load regression line to 170 bpm permitted determination of the physical working capacity at 170 bpm (W170). VO2max for the 20-29 year group (Group I) averaged 3624 ml.min-1 and decreased to 3066 ml.min-1 in the 50-55 year group (Group IV). Lower values were obtained using the Astrand-Ryhming nomogram and HR/load regression (-15% and -9% respectively). W170 was also affected by age (Group I: 190.6 W and Group IV: 158.5 W). No significant correlation were found between VO2max and plasma variables, with the exception of cholesterol (r = 0.59). On the contrary, anthropometric variables showed significant correlations with VO2max, which permitted the prediction of VO2max using multiple regression equations. The two best correlations were: 1. VO2max = 0.800 - 0.0225.(A) +0.0189.(W)+1.26.(H) (r = 0.87; p less than 0.001) 2. VO2max = 0.996 - 0.0176.(A) + 0.025.(W) + 0.838.(H) + 0.0255.(LBM) (r = 0.88; p less than 0.001) where A = years of age; W = body weight in kg; H = height in m and LBM = lean body mass in kg.

Adult↗