Abstract
The present paper concerns the development of an apparatus for an Olympic player of archery to monitor his mental state during games.
Two physiological indices derived from electrocardiogram are used to evaluate the level of tension. The indices are RR interval and respiratory component of RR interval variance, which are differently influenced by the two branches of autonomic nervous system. Some field data and experimental data suggested the usefulness of the two dimensional evaluation.
A portable apparatus was developed which implements the method with the functions to check the reliability of the evaluation.
