A method for monitoring an individual’s physiological condition and detecting abnormalities therein, comprising concurrently receiving an electrocardiograph signal and a ballistocardiograph signal. The cover has an oil reservoir and oil inlet and an integral transfer tube having an outlet which is coupled directly to the inlet of the engine’s oil pump. A relative position determination unit determines whether the relative position of the teammate player object selected by the position announcement target selection unit, relative to the position and reference direction of the operation target player object, satisfies the relative position condition associated with the position announcing sound data. The underpressure box creates an underpressure region between the leader and the underpressure box, the region having an underpressure p1 at the detachment point, i.