The Validity of the Estimated Maximal Oxygen Intake by Different Indirect Methods in Middle-Aged and Elderly Men

• Published in: Nihon Rōnen Igakkai zasshi Vol. 21; no. 2; pp. 124 - 132
• Main Author: Hino, Seiji
• Format: Journal Article
• Language: Japanese
• Published: Japan The Japan Geriatrics Society 01.03.1984
• Subjects: Aged; exercise prescription; Exercise Test; Female; Heart Rate; Humans; Male; maximal oxygen intake; Methods; Middle Aged; multiple regression equation; Oxygen - physiology; Regression Analysis; Respiration
• ISSN: 0300-9173
• DOI: 10.3143/geriatrics.21.124

The purposes of this study were firstly to compare the validity of estimated maximal oxygen intake (VO2 max) from different conventional methods and secondary to develop a multiple regression equations for the estimation of VO2 max at a bicycle ergometer. The subjects tested were 21 physically active men aged 42-74 years and 13 physically inactive women aged 32-53 years. A) The estimated VO2max values by Åstrand-Ryhming, Döbeln et al., and Siconolfi et al. were obtained from directly measured physiological parameters (heart rate and oxygen intake) and work load during the submaximal work at one work rate. The validities of their estimation methods of VO2max were examined. Siconolfi's procedure was found to be the best fit estimation method of VO2max in both physically active and inactive subjects at whole heart rate (HR) levels, especially at heart rate, 131-140beats/min level. B) Similarly, the validity of the estimated VO2 max by another investigators (Maritz et al. and Margaria et al.) were examined on the submaximal work at two or four rates of work. When the estimation methods by Maritz et al. and Margaria et al. are available, it is revealed that such estimations caused trouble at the determination of population mean maximal heart rate (HRmax) or individual's one. A comparison between the two different procedures as mentioned above was carried in our laboratory, and as compared with Margaria's procedure, Maritz's procedure gave better estimation VO2 max for physically inactive women, however less for physically active men. C) From a multiple regression equation obtained in this study, a percentage error of estimate (EE, %) and correlation coefficient(r) derived from data from physically active men were as follows; 1) At heart rate 131-140beats/min level; Y=0.7505+0.1263·VO2/HR (EE=6.2±4.5%; r=0.681) 2) At heart rate 151-169beats/min level; Y=0.4511-2.3967·VO2+0.5309·VO2/HR (EE=4.0±9.1%; r=0.493) where Y is the VO2 max (l/min). Including physically active men and inactive women were shown as below; 3) At heart rate 131-140beats/min level: EE=3.8±8.5%; r=0.899 4) At heart rate 151-169beats/min level: EE=2.7±8.9%; r=0.886 It was suggested that those estimated equations for VO2max gave a good correspondence to those measured values and might be utilized more accurate estimation and easy to practical use.