Abstract
Maximum oxygen intake values were determined by plotting three repeated measurements of oxygen consumption and heart rate at four levels of work in stepping, shovelling and tramming. Straight lines were fitted by the Wald technique to these plots and extrapolated to 180 beats/ min. The oxygen consumption values, on these straight lines, equivalent to the population mean maximum heart rate of 180 beats/min, are taken to be the individuals' maximum oxygen intake values. Sixteen subjects were studied in this way. The estimates of maximum oxygen intake values for tramming were generally biassed towards higher values than those for the shovelling and stepping tests. The reason for this bias is that the highest level of work in tramming did not raise the heart rates above 120 beats/min. Previous studies at this Laboratory have shown that it is essential that the heart rates at the highest level of work should be at least 140 beats/min for accurate estimates of maximum oxygen intake. The estimates of maximum oxygen intake values for the step-test agree closely with the values obtained with individuals engaged in shovelling. This agreement is very important because it means that the step-test results can be validly applied to actual mine conditions for the task of shovelling rock.
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