title: [One-dimensional echocardiography during Valsalva's maneuver: I. Changes in the size of the left atrium and heart rate in healthy young persons and athletes].
mesh_terms: D000328:Adult; D016275:Atrial Function; D002306:Cardiac Volume; D004452:Echocardiography; D006339:Heart Rate; D006801:Humans; D010809:Physical Fitness; D013177:Sports; D014636:Valsalva Maneuver
vernacular_title: Jednorozmĕrná echokardiografie pri Valsalvovĕ manévru: I. Zmĕny velikosti levé sínĕ a srdecní frekvence u zdravých mladých osob a sportovců.