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Showing 1 to 20 of 20 for “"Hyperventilation"”.
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The hyperventilation syndrome
The hyperventilation syndrome is the name given to a distinctive group of symptoms and signs which are caused by an increase in the depth and rate of breathing. This abnormal breathing is nearly always the result of emotional stress. The association between emotional stress and disorders of …
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Hyperventilation and ECG components used in exercise for diagnosis of ischemic heart disease in healthy females
Hyperventilation has been reported to cause false-positive ischemic shifts in the ST-segment of the electrocardiogram during exercise. These responses have been observed to occur at a higher incidence in females than males. Therefore, the purpose of this study was to determine the effects of the …
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Effects of submaximal exercise and hyperventilation on ECG components in healthy, young adult men with recording leads typically used for evaluation of ischemic heart disease
… detecting ST segment depression with exercise or hyperventilation in apparently normal males. Seven physically active men (29.4 + 2.9 yrs, 180.9 + 2.5 cm, 77.9 + 3.4 kg, x±SEM), free of risk factors for heart disease, were initially found to have J point (J₀) depression with mild exercise in lead …
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The effects of hypocapnia on cardiac electrical activity and heart function and its relevance to the diagnosis of coronary artery disease
… the effects of hypocapnia, induced by mechanical hyperventilation (in 21% or 15% inspired O\(_2\)), on cardiac electrical activity and heart function were investigated using an electrocardiogram (ECG) and echocardiogram. In addition, a pilot study was conducted to examine the effect of hypocapnia …
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A comparative study of the ventilatory responses of the golden hamster, Mesocricetus auratus and the laboratory rat, Rattus norvegicus, under hypercapnic and/or hypoxic gas mixtures
… Both hypercapnic and hypoxic gas mixtures caused hyperventilation in hamsters. The more a gas mixture deviated from normal air, the greater the ventilatory increase. Combining hypercapnic and hypoxic conditions did not potentiate the response. Rats exhibited a greater hyperventilation in response …
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A critical examination of the phenomenon of claustrophobia: do subtypes exist?
… measures and physiological response to a hyperventilation challenge were used to validate claustrophobic subtypes. A significant main effect for "Avoidance of Crowds" was found when using heart rate change and post heart rate as dependent measures. Specifically, subjects high on the …
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Effects of Parental Modeling on the Development of Panic-Relevant Escape and Avoidance among Adolescents: An Experimental Study Using a Biological Challenge Procedure
… a) complete participation in a 3-min voluntary hyperventilation exercise (no escape modeling group); or b) prematurely terminate a similar procedure (escape modeling group). It was predicted that adolescents who observed their parents prematurely terminate participation in the biological …
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Cardiac, ventilatory and metabolic responses of two ecologically distinct species of fish to waterborne cyanide
… to the direct effect of cyanide on the heart. Hyperventilation in the trout persisted throughout the exposure period, although the rate and amplitude fluctuated and was variable between individual fish. During the last hour of exposure (highest cyanide concentration), ventilation was …
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forsan et haec olim meminisse iuvabit
… both gentle shallow breaths and intense hyperventilation. Throughout, the quartet is asked to explore gradual transformations of playing techniques including bowing, vibrato and harmonics, as well as dramatic contrasts in texture and timber that emerge over the duration of the structure. …
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An experimental investigation of the relationship between physiological arousal, panic expectancy and agoraphobia
… Physiological arousal induced through hyperventilation raised anxiety immediately following induction, but did not affect anxiety or avoidance on the subsequent walk. Although panic expectancy did not change as a result of the manipulations, initial panic expectancy was the strongest …
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The design and evaluation of the P₀.₁ method of assessing ventilatory drive
Hypercapnia and/or hypoxia normally cause hyperventilation, The sensitivity to hypercapnia and hypoxia and the resultant hyperventilation is reduced in a patient suffering from damped respiratory centre activity. The P 0.1 method is a modification of the rebreathing technique where a patient …
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The behavioural physiology of diving animals, in particular tufted ducks (Aythya fuligula), and the implications for models of optimal diving
… surface duration in tufted ducks, while pre-dive hyperventilation caused hypocapnia suggesting carbon dioxide is more often a limiting factor on dive duration. Oxygen uptake was not affected by hypercapnic exposure between dives and minimally affected by hypoxia, however dive time budgeting …
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Kardiopulmonale und metabolische Kenngrößen beim skilanglaufspezifischen Rollskitraining
… beim Skirollertraining mit einer starken Hyperventilation hervorzuheben ist. <br>Das im Skilanglauf wichtige Training im Bereich der maximalen VO2 zur Verbesserung des aeroben Leistungsvermögens kann auf dieser Trainingsstrecke nicht absolviert werde
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The Effects of Glochidiosis on Fish Respiration
… exposed to increased predation if compensatory hyperventilation attracts the attention of predators. Selection pressure on fish to avoid glochidiosis presumably results in reciprocal selection on mussels to evolve ever more sophisticated lures.
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… separation studies before 40 years ago in hyperventilation technology to help patients under anesthesia in hospitals. There are many applications for this research such as removing heat from chemical reactors, electrical devices and other enclosed environments such as submarines, …
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Psychophysiological Effects of Respiratory Challenges before and after Breathing Training in Panic Disorder and Patients suffering from Episodic Anxiety Attacks
… Hypoventilation (VHO) test and a Voluntary Hyperventilation (VHT) test in which they were asked to either lower or raise their pCO2 while psychophysiological measures were recorded. Each test consisted of 3 segments: 1 min baseline, 3 min paced breathing, and 8 min recovery. Before …
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Oscillatory Flow As A Means Of Enhanced Species Separation: A Three Dimensional Time-accurate Cfd Analysis
… of the species. This idea traces back to hyperventilation studies done over 40 years ago and to the implementation of the technology in hospital environments to provide life-support for patients under anesthesia. However, it is only in recent years that the underlying physics of …
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Psychophysiologische Reaktivität bei Alexithymie : ein experimenteller Beitrag zur Validierung des Alexithymiekonstruktes
… und Belastungen (durch Filmausschnitte, Hyperventilation und einen modifizierten Stroop-Test) wurden die Reaktionen der Versuchspersonen hinsichtlich ihrer Gefühle, Körperempfindungen und physiologischen Parameter erfasst. Wie erwartet berichteten hoch alexithyme Gesunde und besonders …
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Exercise testing in healthy haemodialysis patients
… of any clinical circulatory overload. Mild hyperventilation and disproportionate lactic acidosis was seen towards peak exercise, probably because, in spite of the decreased work capacity, the patients were much closer to their maximum performance. However, the limiting factors were clearly …