[Physical performance and function of the cardiorespiratory system in additional respiratory resistance].

This paper presents results of examining respiration and circulation parameters of healthy volunteers pedalling a bicycle ergometer at different degrees of inspiratory-expiratory resistance. In this situation the performance-limiting factor is an increased load on respiratory muscles. An additional signal of performance problems is respiratory discomfort. The paper gives a formula for predicting maximally allowable workloads in response to increased respiration resistance.