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Tissue hypoxia refers to low levels of oxygen in the tissues of the body and the term hypoxia is a general term for low levels of oxygen. [2] Hypoxemia is usually caused by pulmonary disease whereas tissue oxygenation requires additionally adequate circulation of blood and perfusion of tissue to meet metabolic demands.
The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness. [8] Chronotropic incompetence (CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation.
However, oftentimes lower heart rates can be totally normal, and a well-trained athlete can have a normal heart rate in the 50s or as low as 40 without any cause for concern, he notes.
Cardiac output, the amount of blood that leaves the heart in a given time period (i.e. liters per minute), is proportional to both the chamber sizes of the heart and the rate at which the heart beats. With a larger left ventricle, the heart rate can decrease and still maintain a level of cardiac output necessary for the body.
A low resting heart rate in the 50s is generally associated with better cardiovascular health, continues Dr. Steinbaum. ... “Heart rate variability with exercise, and during recovery after ...
The adult resting heart rate ranges from 60 to 100 bpm. Exercise and fitness levels, age and basal metabolic rate can all affect the heart rate. An athlete's heart rate can be lower than 60 bpm. During exercise the rate can be 150 bpm with maximum rates reaching from 200 and 220 bpm. [1]
[medical citation needed] Sinus bradycardia can also be an adaptive advantage; for example, diving seals may have a heart rate as low as 12 beats per minute, helping them to conserve oxygen during long dives. [4] Sinus bradycardia is a common condition found in both healthy individuals and those who are considered well-conditioned athletes. [5]
An arrhythmia is an irregular heartbeat that occurs due to a problem with the electrical activity of your heart. Types of arrhythmia include: Tachycardia. A faster-than-normal heart rate. Bradycardia.