Maximal oxygen uptake in Chilean workers of normal nutritional status

Summary

Maximum oxygen uptake$\left( {\dot V_{{\text{O}}_{{\text{2max}}} } } \right)$ 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 compositon and blood chemistry. Measurement of$\dot V_{{\text{O}}_{\text{2}} }$ was performed on a motor-driven treadmill. The predicted 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).$\dot V_{{\text{O}}_{{\text{2max}}} }$ 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$\dot V_{{\text{O}}_{{\text{2max}}} }$ and plasma variables, with the exception of cholesterol (r=0.59). On the contrary, anthropometric variables showed significant correlations with$\dot V_{{\text{O}}_{{\text{2max}}} }$, which permitted the prediction of$\dot V_{{\text{O}}_{{\text{2max}}} }$ using multiple regression equations. The two best correlations were:

$$\begin{gathered} \dot V_{{\text{O}}_{{\text{2 max}}} } = 0.800 - 0225 \cdot \left( {\text{A}} \right) \hfill \\ + 0.0189 \cdot \left( {\text{W}} \right) + 1.26 \cdot \left( {\text{H}} \right) \hfill \\ \left( {r = 0.87;p< 0.001} \right) \hfill \\ \end{gathered} $$

(1.)

$$\begin{gathered} \dot V_{{\text{O}}_{{\text{2 max}}} } = 0.996 - 0.0176 \cdot \left( {\text{A}} \right) \hfill \\ + 0.025 \cdot \left( {\text{W}} \right) + 0.838 \cdot \left( {\text{H}} \right) + 0.0255 \cdot \left( {{\text{LBM}}} \right) \hfill \\ \left( {r = 0.88;p< 0.001} \right) \hfill \\ \end{gathered} $$

(2.)

where A=years of age; W=body weight in kg; H=height in m and LBM=lean body mass in kg.