[THE RATE OF CARDIAC CONTRACTIONS AS AN INDEX OF THE EFFECT OF PHYSICAL EFFORT ON THE HEART].
D006321:Heart; D005082:Physical Exertion; D010827:Physiology
EXERTION; HEART; PHYSIOLOGY
CHASTOTA SERDECHNYKH SOKRASHCHENII KAK POKAZATEL' VOZDEISTVIIA FIZICHESKIKH UPRAZHENI I NA SERDTSE.