Individual minute (IM) duration represents the criteria of biological rhythms endogenous organization as well as the organism functional state. This index is a rather stable index in healthy people..IM characterizes time endogenous organization as well as | the organism adaptation abilities. People with high abilities to adaptation have IM more than the minute of physical time and equal to 62,9-69,7 sec, while it is less than 1 min and equals to 47,0-46,2 sec in the people with low abilities to adaptation. IM possesses cyrcaseptal rhythm - its value is maximal on Tuesday and Wednesday and is minimal on Friday and Satur-|day. IM value helps also in testifying to the development of fatigue, dyschronosis, psycho-emotional ten-sion. Taking into account IM value can be determined at the beginning and the end of the class, during the day, week, month, year