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This study tested various sources of changes in respiratory sinus arrhythmia (RSA). Twenty-two healthy participants participated in three experimental conditions (mental stress, relaxation, and mild physical exercise) that each consisted of three breathing parts (normal breathing, breathing compressed room air, and breathing compressed 5% CO2-enriched air).(More)
  • S Rietveld
  • 1998
Clinical observations and research show that symptom perception in asthma is, at worst, inaccurate or often biased in two directions: (1) blunted perception, (2) overperception (both involving airway obstruction manifested in low or high breathlessness). Theoretically breathlessness occurs during respiratory labor or blood gas changes. However,(More)
For continuous monitoring of the respiratory condition of patients, e.g., at the intensive care unit, computer assistance is required. Existing mechanical devices, such as the peak expiratory flow meter, provide only with incidental measurements. Moreover, such methods require cooperation of the patient, which at, e.g., the ICU is usually not possible. The(More)
BACKGROUND Children with asthma are vulnerable to negative emotions, but clinical observations and research suggest that negative emotions can also be precipitants of asthma attacks. Empirical data provided mixed results. The hypothesis was tested that negative emotions influence subjective rather than objective symptoms of asthma, breathlessness and(More)
Emotional factors are an obstacle in the diagnosis and management of asthma. This review discusses three problem patterns: negative emotions in relatively normal patients with asthma; patients presenting possible functional symptoms and; patients presenting asthma in conjunction with psychiatric deviations. Negative emotions influence the symptoms and(More)
BACKGROUND A majority of patients with asthma believe that psychological factors (particularly stress) can induce asthma attacks, but empirical support for actual stress-induced airways obstruction is controversial. This study tested the hypothesis that stress induces breathlessness and not airways obstruction. METHODS Stress was induced by a frustrating(More)
This experiment tested the hypothesis that the setting in which research is conducted may dominate symptom magnitude. Cough was induced with inhaled citric acid and its magnitude was influenced by changing the setting in 30 adolescents with asthma. Cough thresholds for citric acid were determined. The participants were assigned to a condition emphasising(More)
BACKGROUND Previous studies have shown that patients with congenital heart disease (ConHD) report a diminished health-related quality of life. PURPOSE This study examines the mechanisms by which ConHD affects health-related quality of life. We hypothesize that (1) the relation between trait anxiety and quality of life is mediated by a negative(More)
Breathlessness and negative emotions during asthma attacks interact in complex patterns. This study tested the influence of emotional imagery on breathlessness during voluntary breath holding. Adolescents with and without asthma (n = 36 + 36) were assigned to positive imagery, negative imagery, or no imagery. There were four trials with close to thresholds(More)