[Determination of the optimal duration for performing basic work operations by 4th-grade pupils].
D002648:Child; D004576:Electromyography; D006339:Heart Rate; D006801:Humans; D008297:Male; D009132:Muscles / Q000502:physiology; D013997:Time Factors; D014829:Vocational Education; D014937:Work
Opredelenie optimal'noi prodolzhitel'nosti vypolneniia osnovnykh trudovykh operatsii uchashchimisia 4-go klassa.