نتایج جستجو برای: تغییرپذیری ضربان قلب heart rate variability hrv
تعداد نتایج: 1415233 فیلتر نتایج به سال:
زمینه و هدف : الگوی ضربان قلب جنین یکی از مهم‌ترین معیارهای مورد ارزیابی در آزمون بدون استرس است. این مطالعه به منظور مقایسه اثر دو روش کاهنده اضطراب، آموزش تن‌آرامی و مهارت‌های دلبستگی بر فراوانی افت تک‌گیر و تغییرپذیری ضربان به ضربان قلب جنین انجام شد. روش بررسی : در این کارآزمایی بالینی 126 زن نخست باردار به روش تصادفی در سه گروه 42 نفری کنترل، تن‌آرامی و دلبستگی قرار گرفتند. پس از 4 هفته م...
BACKGROUND The study of the correlation of menopausal symptoms with heart rate variability (HRV) has not been adequate. The aim of this study was to investigate the relationship between postmenopausal symptoms measured by the menopause rating scale (MRS) and HRV. METHODS We assessed postmenopausal symptoms (using MRS) with age, BMI, educational status, occupation, marital status, alcohol and ...
background and objective: obstructive sleep apnea syndrome (osas) is a prevalent disease in adults. limited evidence regarding the effect of severity of sleep apnea and depression on heart rate variability (hrv) indices exists. hence, we decided to focus on the association between hrv and severity of osas based on depression score. materials and methods: a total of 193 patients with confirmed o...
Background. A biofeedback program receives attention as an intervention program for athletes to regulate their psychological state. Objectives. The purpose was to apply for a heart rate variability (HRV) biofeedback training program and validate its effectiveness for racket sports players. Methods. The participants were eight elite sport athletes (three men and five women): five squash players...
Aims: The aim of this study was to evaluate the effect of stress inoculation on laboratory markers such as heart rate variability and salivary cortisol and clinical outcomes (anxiety, stress and depression) of patients undergoing coronary artery bypass graft surgery. Methods & Materials: The research is a semi experimental study with the pre, post-test and experimental and control groups. The...
BACKGROUND It is unclear from prior reports whether the relationships between self-ratings of anxiety or emotional stress and parasympathetic nervous system components of heart rate variability are independent of personality and cardiorespiratory fitness. We examined those relationships in a clinical setting prior to a standardized exercise test. METHODS AND RESULTS Heart rate variability (HR...
Background: Recent studies have claimed a positive effect of physical activity and body composition on vagal tone. In pediatric populations, there is a pronounced decrease in heart rate with age. While this decrease is often interpreted as an age-related increase in vagal tone, there is some evidence that it may be related to a decrease in intrinsic heart rate. This factor has not been taken in...
This study tests the hypothesis that high levels of high-frequency heart rate variability (HF-HRV) predisposes individuals to affiliate with new groups. Resting cardiac physiological recordings were taken before and after experimental sessions to measure trait high-frequency heart rate variability as an index of dispositional autonomic influence on heart rate. Following an experimental manipula...
OBJECTIVE We aimed to study short-term heart rate variability (HRV) in 113 apparently healthy children permanent residents of moderate altitudes, the effects of gender and altitude. METHODS Children were assigned into 3 groups according with altitude of residence: Group 1--1650 m/a/s/l (n=38), Group 2--1740 m/a/s/l (n=36) and Group 3--2030 m/a/s/l (n=39). All children underwent short-term ele...
Heart rate variability (HRV) reflects the healthiness of autonomic nervous system, which is associated with exercise capacity. We therefore investigated whether HRV could predict the exercise capacity in the adults with cardiac syndrome X (CSX). A total of 238 subjects (57±12 years, 67.8% men), who were diagnosed as CSX by the positive exercise stress test and nearly normal coronary angiogram w...
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