Cardiovascular changes during deep breath-hold dives in a pressure chamber

Cardiovascular changes during deep breath-hold dives in a pressure chamber.

Electrocardiogram, cardiac output, and blood lactate accumulation were recorded in three elite breath-hold divers diving to 40-55 m in a pressure chamber in thermoneutral (35 degrees C) or cool (25 degrees C) water. In two of the divers, invasive recordings of arterial blood pressure were also obtained during dives to 50 m in cool water. Bradycardia during the dives was more pronounced and deve...

Cardiovascular changes during underwater static and dynamic breath-hold dives in trained divers.

Limited information exists concerning arterial blood pressure (BP) changes in underwater breath-hold diving. Simulated chamber dives to 50 m of freshwater (mfw) reported very high levels of invasive BP in two divers during static apnea (SA), whereas a recent study using a noninvasive subaquatic sphygmomanometer reported unchanged or mildly increased values at 10 m SA dive. In this study we inve...

Decompression sickness following repeated breath-hold dives.

Heart rate of Japanese male ama divers during breath-hold dives: diving bradycardia or exercise tachycardia?

Human breath-hold diving usually involves swimming exercise. It might be expected that the combination of apneic submersion and exercise would result in opposite cardiac responses: diving bradycardia and exercise tachycardia. However, several earlier studies of this combination have reported that diving bradycardia is the dominant effect and that heart rate is not increased and is even further ...

Cellular Glucose Uptake During Breath-Hold Diving in Experienced Male Breath-Hold Divers

BACKGROUND The physiological and pathophysiological mechanisms that govern diving, both self-contained underwater breathing apparatus (SCUBA) and breath-hold diving (BH-diving), are in large part well known, even if there are still many unknown aspects, in particular about cell metabolism during BH-diving. The scope of this study was to investigate changes in glycemia, insulinemia, and the cate...