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Bradycardia, also called bradyarrhythmia, is a resting heart rate under 60 beats per minute (BPM). While bradycardia can result from a variety of pathologic processes, it is commonly a physiologic response to cardiovascular conditioning, or due to asymptomatic type 1 atrioventricular block. Resting heart rates less than 50 BPM are often normal during sleep in young and healthy adults, and in athletes. In large population studies of adults without underlying heart disease, resting heart rates of 45-50 BPM appear to be the lower limits of normal, dependent on age and sex. Bradycardia is most likely to be discovered in the elderly, as both age and underlying cardiac disease progression contribute to its development.
Lung volumes and lung capacities refer to the volume of air in the lungs at different phases of the respiratory cycle.
The Valsalva maneuver is performed by a forceful attempt of exhalation against a closed airway, usually done by closing one's mouth and pinching one's nose shut while expelling air, as if blowing up a balloon. Variations of the maneuver can be used either in medical examination as a test of cardiac function and autonomic nervous control of the heart, or to clear the ears and sinuses when ambient pressure changes, as in scuba diving, hyperbaric oxygen therapy, or air travel.
The diving reflex, also known as the diving response and mammalian diving reflex, is a set of physiological responses to immersion that overrides the basic homeostatic reflexes, and is found in all air-breathing vertebrates studied to date. It optimizes respiration by preferentially distributing oxygen stores to the heart and brain, enabling submersion for an extended time.
Respiratory arrest is a serious medical condition caused by apnea or respiratory dysfunction severe enough that it will not sustain the body. Prolonged apnea refers to a patient who has stopped breathing for a long period of time. If the heart muscle contraction is intact, the condition is known as respiratory arrest. An abrupt stop of pulmonary gas exchange lasting for more than five minutes may permanently damage vital organs, especially the brain. Lack of oxygen to the brain causes loss of consciousness. Brain injury is likely if respiratory arrest goes untreated for more than three minutes, and death is almost certain if more than five minutes.
Liquid breathing is a form of respiration in which a normally air-breathing organism breathes an oxygen-rich liquid (such as a perfluorocarbon), rather than breathing air, by selecting a liquid that can hold a large amount of oxygen and is capable of CO2 gas exchange.
Cardiorespiratory fitness (CRF) refers to the ability of the circulatory and respiratory systems to supply oxygen to skeletal muscles during sustained physical activity. Scientists and researchers use CRF to assess the functional capacity of the respiratory and cardiovascular systems. These functions include ventilation, perfusion, gas exchange, vasodilation, and delivery of oxygen to the body's tissues. As these body's functions are vital to an individual's health, CRF allows observers to quantify an individual's morbidity and mortality risk as a function of cardiorespiratory health.
The Japan Academy Prize (日本学士院賞) is a prize awarded by the Japan Academy in recognition of academic theses, books, and achievements.
Christian James Lambertsen was an American environmental medicine and diving medicine specialist who was principally responsible for developing the United States Navy frogmen's rebreathers in the early 1940s for underwater warfare. Lambertsen designed a series of rebreathers in 1940 and in 1944 and first called his invention breathing apparatus. Later, after the war, he called it Laru and finally, in 1952, he changed his invention's name again to SCUBA. Although diving regulator technology was invented by Émile Gagnan and Jacques-Yves Cousteau in 1943 and was unrelated to rebreathers, the current use of the word SCUBA is largely attributed to the Gagnan-Cousteau invention. The US Navy considers Lambertsen to be "the father of the Frogmen".
Vagal tone is activity of the vagus nerve, the 10th cranial nerve and a fundamental component of the parasympathetic branch of the autonomic nervous system. This branch of the nervous system is not under conscious control and is largely responsible for the regulation of several body compartments at rest. Vagal activity results in various effects, including: heart rate reduction, vasodilation/constriction of vessels, glandular activity in the heart, lungs, and digestive tract, liver, immune system regulation as well as control of gastrointestinal sensitivity, motility and inflammation.
The respiratory center is located in the medulla oblongata and pons, in the brainstem. The respiratory center is made up of three major respiratory groups of neurons, two in the medulla and one in the pons. In the medulla they are the dorsal respiratory group, and the ventral respiratory group. In the pons, the pontine respiratory group includes two areas known as the pneumotaxic center and the apneustic center.
Cold shock response is a series of neurogenic cardio-respiratory responses caused by sudden immersion in cold water.
In medicine Imaging Lung Sound Behavior with Vibration Response Imaging (VRI), is a novelty computer-based technology that takes the concept of the stethoscope to a more progressive level. Since the invention of the stethoscope by René-Théophile-Hyacinthe Laennec France in 1816, physicians have been utilizing lung sounds to diagnose various chest conditions. Today auscultation provides physicians with extensive information on the examination of the patient. The skills of the examiner however, vary, as seen in a clinical study that was conducted on the diagnosis of pneumonia in 2004.
Hypoventilation training is a physical training method in which periods of exercise with reduced breathing frequency are interspersed with periods with normal breathing. The hypoventilation technique consists of short breath holdings and can be performed in different types of exercise: running, cycling, swimming, rowing, skating, etc.
John R. Clarke is an American scientist, private pilot and author. He is currently the Scientific Director at the United States Navy Experimental Diving Unit (NEDU). Clarke is recognized as a leading authority on underwater breathing apparatus engineering.
Human physiology of underwater diving is the physiological influences of the underwater environment on the human diver, and adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply. It, therefore, includes the range of physiological effects generally limited to human ambient pressure divers either freediving or using underwater breathing apparatus. Several factors influence the diver, including immersion, exposure to the water, the limitations of breath-hold endurance, variations in ambient pressure, the effects of breathing gases at raised ambient pressure, effects caused by the use of breathing apparatus, and sensory impairment. All of these may affect diver performance and safety.
The Japan men's national artistic gymnastics team is a sport group governed by Japan Gymnastics Association and represents Japan in international gymnastics competitions and multi-sports events. Followed the establishment of All Japan Gymnastics Federation in 1930, the team first appeared at the 1932 Summer Olympics and gradually became the major force till this day. For nearly two decades, from 1960 to 1978, Japanese men was dominant and won every gold medal at the Olympics and World Championships.
References
- ↑ Fukuie, Marina; Hoshi, Daisuke; Hashitomi, Tatsuya; Watanabe, Kouichi; Tarumi, Takashi; Sugawara, Jun (2021). "Impact of Pedaling Cadence and Resistance on the Cardiovascular Response during Underwater Cycling". The FASEB Journal. 35 (S1). doi: 10.1096/fasebj.2021.35.S1.00383 . ISSN 1530-6860. S2CID 236609589.
- ↑ Hoshi, Daisuke; Fukuie, Marina; Hashitomi, Tatsuya; Tarumi, Takashi; Sugawara, Jun; Watanabe, Koichi (2021). "Influence Of Different Exercise Intensities On The Respiratory Function And Breathing Pattern During Underwater Cycling: 275". Medicine & Science in Sports & Exercise. 53 (8S): 86. doi: 10.1249/01.mss.0000760112.87333.5c . ISSN 0195-9131. S2CID 237717286.
- ↑ Hoshi, Daisuke; Fukuie, Marina; Hashitomi, Tatsuya; Tarumi, Takashi; Sugawara, Jun; Watanabe, Koichi (2021). "Respiratory Response to Underwater and Land-based Cycling at the Matched Oxygen Uptake". The FASEB Journal. 35 (S1). doi: 10.1096/fasebj.2021.35.S1.02647 . ISSN 1530-6860. S2CID 236592042.
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