Indirect assessment of energy expenditure at different work rates.

Indirect measurement of energy expenditure during work is carried oul from either minuie ventilation or heart rate during the activity under consideration. In the present study a multiple linear regression equation has been evolved for estimating energy expenditure from minute ventilation and heart rate during various grades of submaximal work on a bicycle ergomcler on 55 human subjects involving 165 observations. The product-moment correlations of minute ventilation and heart rate with energy expenditure were found to be 0 74 and 0 59 respectively. The multiple correlation coefficient between observed energy expenditure and both minute ventilation and heart rate was 0.80 (p < 0.001). This is significantly (p < 0. 05)greater than the individual correlation coefficient for energy expenditure and minute ventilation alone. It is concluded that a combination of minute ventilation and heart rate is a better predictor of energy expenditure than either of the two variables used singly. A nomogram has been constructed for this purpose. [ABSTRACT FROM PUBLISHER]