Breathing Intervals
Mostrando 13-24 de 40 artigos, teses e dissertações.
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13. Análise de crescimento e produtividade de duas variedades de cana-de-açúcar (Saccharum spp) influenciadas por doses de fósforo
The knowledge of the leaf area is required every time the sugarcane is subjected to evaluation in which different varieties are compared or submitted to different environmental conditions, managements or fertilizations, therefore evidently showing alteration in dimensions of the plant leaves, so affecting the photosynthetic process. Although the higher breat
Publicado em: 2007
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14. Effects of age and physical activity on the autonomic control of heart rate in healthy men
The effects of the aging process and an active life-style on the autonomic control of heart rate (HR) were investigated in nine young sedentary (YS, 23 ± 2.4 years), 16 young active (YA, 22 ± 2.1 years), 8 older sedentary (OS, 63 ± 2.4 years) and 8 older active (OA, 61 ± 1.1 years) healthy men. Electrocardiogram was continuously recorded for 15 min at re
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-09
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15. Effect of oscillatory breathing on the variability of the RR Intervals and its prognostic importance in individuals with left ventricular global systolic dysfunction
OBJECTIVE: To assess the effect of the oscillatory breathing on the variability of RR intervals (VRR) and on prognostic significance after one year follow-up in subjects with left ventricular global systolic dysfunction. METHODS: We studied 76 subjects, whose age ranged from 40 to 80 years, paired for age and gender, divided into two groups: group I - 34 hea
Arquivos Brasileiros de Cardiologia. Publicado em: 2003-05
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16. Assessment of vagal control of the heart in diabetes. Measures of R-R interval variation under different conditions.
R-R intervals and R-R interval variation were measured in 2 selected groups of diabetic subjects; 1 group was selected because vagal control of the heart appeared normal, the other group was selected because they lacked vagal control of the heart. The means of the R-R intervals for the 2 groups were not significantly different under various conditions (sleep
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17. Stabilizing immature breathing patterns of preterm infants using stochastic mechanosensory stimulation
Breathing patterns in preterm infants consist of highly variable interbreath intervals (IBIs) that might originate from nonlinear properties of the respiratory oscillator and its input-output responses to peripheral and central signals. Here, we explore a property of nonlinear control, the potential for large improvement in the stability of breathing using l
American Physiological Society.
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18. Adjunct treatment with yoga in chronic severe airways obstruction.
Eleven patients with severe chronic airways obstruction were given training in yogic breathing exercises and postures. A matched group of 11 patients were given physiotherapy breathing exercises. Both groups of patients were followed up at monthly intervals for nine months with pulmonary function tests, tests of exercise tolerance, and inquiry into their sym
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19. Controlled trial of respiratory muscle training in chronic airflow limitation.
BACKGROUND: Whether respiratory muscle training is of benefit to patients with chronic airflow limitation is controversial. The objective of the study was to determine the effect of resistance breathing training on physiological and functional measures in patients with chronic airflow obstruction. METHODS: The design was a randomised, double blind, controlle
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20. Effect of cardiopulmonary C fibre activation on the firing activity of ventral respiratory group neurones in the rat.
1. Cardiopulmonary C fibre receptor stimulation elicits apnoea and rapid shallow breathing, but the effects on the firing activity of central respiratory neurones are not well understood. This study examined the responses of ventral respiratory group neurones: decrementing expiratory (Edec), augmenting expiratory (Eaug), and inspiratory (I) neurones during c
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21. 'Non-hypotensive' hypovolaemia reduces ascending aortic dimensions in humans.
1. The notion that small, 'non-hypotensive' reductions of effective blood volume alter neither arterial pressure nor arterial baroreceptor activity is pervasive in the experimental literature. We tested two hypotheses: (a) that minute arterial pressure and cardiac autonomic outflow changes during hypovolaemia induced by lower body suction in humans are maske
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22. Reproducibility of histamine challenge tests in asthmatic children.
The measurement of bronchial reactivity by histamine challenge testing is of increasing clinical importance in paediatrics. By means of a simple tidal breathing technique for the measurement of histamine sensitivity (expressed as PC20--the concentration of histamine which produces a 20% fall in peak flow rate) in childhood asthma, the reproducibility of pair
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23. Cardiovascular changes associated with augmented breaths in normoxia and hypoxia in the rat.
1. In the present study, anaesthetized rats showed respiratory gasps (augmented breaths) at regular intervals during air breathing and at increased frequency during hypoxia (breathing 15, 12, 8 or 6% O2 in N2). Each augmented breath was accompanied by transient vasodilatation in hindlimb skeletal muscle and sometimes bradycardia. In hypoxia these changes wer
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24. QT interval and dispersion in primary autonomic failure.
OBJECTIVE: To investigate the role of the autonomic nervous system in determining QT interval and dispersion. PATIENTS AND METHODS: 32 patients with chronic primary (idiopathic) autonomic failure (19 men, mean age 60 years) and 21 normal controls (11 men, mean age 59) without symptoms of ischaemic heart disease were studied retrospectively. Autonomic failure