[Comparative analysis of the informational merits of ergometric and functional indicators of work capacity]

Informational merits of ergometric and routine functional indices (MPK, anaerobic threshold--AT, PWC170) were compared by testing performance of 20 young males with high levels of fitness. Criterion for work ability was maximum time of rowing ergometer with incremental loading and two tests with permanent load in the regions of submaximum (about 7 W/kg) and high (about 4 W/kg) loading. Ergometric indices, i.e. individual limits of relative power, were calculated from Muller's equation tlim = eb x W-a. Before, during, and after 5-20 minutes of test session gas exchange, pulse rate, and blood lactate were measured to calculate MPK, AT and PWC170, and oxygen demand fraction. Ergometric indices were found to be no less informative in evaluation of work ability than the common indices involving determination of gas exchange, PR and lactate. Ergometric and functional indices showed high correlation. It was stated that none of the indices can be equally informative regarding all types of work ability testing. Application of two-increment test and subsequent calculation using Muller's equation allows to get around the principle of uncertainty according to which none of the test can be at one and the same time used to assess power and capacity of energy systems of the skeletal muscles. Besides, ergometric tests provide reliable enough characteristics of work ability without resort to expensive and bulky equipment.