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Effects of gender and aerobic fitness on cardiac autonomic responses to head-up tilt in healthy adolescents
- Source :
- Pediatric cardiology. 26(4)
- Publication Year :
- 2005
-
Abstract
- Cardiovascular autonomic responses to orthostatic challenges are affected by gender and cardiorespiratory fitness in adults. However, little is know about the effects of these factors in healthy adolescents. We studied 41 adolescents (20 boys and 21 girls) aged 12-17 years, divided into aerobic fitness tertiles based on the results of a maximal treadmill exercise test. Cardiac autonomic modulation was assessed by heart rate variability (HRV) analysis of 5-minute RR interval recordings before and after 70 degrees head-up tilt maneuver. HRV was analyzed by time (TD) and frequency domain (FD) methods. TD was analyzed by standard deviation of the RR intervals and the root mean square of successive differences of RR intervals. The power spectral components were studied at low (LF) and high (HF) frequencies and as the LF/HF ratio. We did not find any differences in TD and FD measures before and after tilt in either gender or fitness groups, except for a higher heart rate response for boys. These results suggests that cardiac autonomic responses to head-up tilt in healthy adolescents are not affected by gender or aerobic fitness.
- Subjects :
- Male
medicine.medical_specialty
Adolescent
Posture
Autonomic Nervous System
Standard deviation
Orthostatic vital signs
Electrocardiography
Sex Factors
Heart Rate
Reference Values
Tilt-Table Test
Internal medicine
medicine
Aerobic exercise
Heart rate variability
Humans
Child
business.industry
Head up tilt
Cardiorespiratory fitness
Heart
Cardiac surgery
Autonomic nervous system
Physical Fitness
Pediatrics, Perinatology and Child Health
Physical therapy
Cardiology
Female
Cardiology and Cardiovascular Medicine
business
Subjects
Details
- ISSN :
- 01720643
- Volume :
- 26
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Pediatric cardiology
- Accession number :
- edsair.doi.dedup.....1b23374814272395f2b7a870f3813818