Abstract des Autors

The heart rate (HR) was recorded by a beat to beat water proof heart rate recorder in 6 synchronized swimmers as they performed 4 competitive figures. The recorded data show an increase in HR at the beginning of the exercise, even if the synchronized swimmers had their faces under the water. For at least twenty seconds of breath-hold a bradycardia is recorded which lasts until the end of the exercise. Facial immersion produced more than one effect on the cardiac output: facial immersion in back layout position caused tachycardia, and in front layout position with neck extended caused a slowing reflex to the heart. This report contrasts with the literature. Only one swimmer displayed a very high HR (217 bpm) but our recording equipment did not allow us to distinguish between cardiac arrhythmia and tachycardia. The authors suggest following with the in-water studies to understand better which is the most effective slowing reflex to avoid synchronized swimmers syncope. Verf.-Referat