[Relation between the heart rate of miners, age and length of service].
D000328:Adult; D000367:Age Factors; D003032:Coal Mining; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D005082:Physical Exertion; D013997:Time Factors
Kharakteristiki kardioritma u gornorabochikh v zavisimosti ot vozrasta i stazha.