Simulated human diving and heart rate: making the most of the diving response as a laboratory exercise.

Response as a Laboratory Exercise Rate: Making the Most of the Diving Simulated Human Diving and Heart

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 ...

Using stimulation of the diving reflex in humans to teach integrative physiology.

During underwater submersion, the body responds by conserving O2 and prioritizing blood flow to the brain and heart. These physiological adjustments, which involve the nervous, cardiovascular, and respiratory systems, are known as the diving response and provide an ideal example of integrative physiology. The diving reflex can be stimulated in the practical laboratory setting using breath holdi...

The cardiovascular and endocrine responses to voluntary and forced diving in trained and untrained rats.

The mammalian diving response, consisting of apnea, bradycardia, and increased total peripheral resistance, can be modified by conscious awareness, fear, and anticipation. We wondered whether swim and dive training in rats would 1) affect the magnitude of the cardiovascular responses during voluntary and forced diving, and 2) whether this training would reduce or eliminate any stress due to div...

Diving response and arterial oxygen saturation during apnea and exercise in breath-hold divers.

This study addressed the effects of apnea in air and apnea with face immersion in cold water (10 degrees C) on the diving response and arterial oxygen saturation during dynamic exercise. Eight trained breath-hold divers performed steady-state exercise on a cycle ergometer at 100 W. During exercise, each subject performed 30-s apneas in air and 30-s apneas with face immersion. The heart rate and...