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Assessment of the dependence of heart rate variability on sleep patterns in adolescents | ||
| Caspian Journal of Environmental Sciences | ||
| دوره 24، شماره 4، دی 2026، صفحه 1125-1138 اصل مقاله (940.15 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22124/cjes.2026.10024 | ||
| نویسندگان | ||
| Askar Kalekeshov1؛ Ainur Junussova1؛ Elzira Kyrbassova1؛ Bagila Zhoshibekova2؛ Ukibayev Rustam Zhumanbekuly1؛ Mira Aitzhanova* 1؛ Meruyert Parmanbekova* 1؛ Yerlan Makashev3 | ||
| 1Kazakh National Women's Teacher Training University, Almaty, Kazakhstan | ||
| 2Shymkent University, Shymkent, Kazakhstan | ||
| 3Institute of Genetics and Physiology, Almaty, Kazakhstan | ||
| چکیده | ||
| Background: Sleep disturbances and irregular sleep schedules are increasingly recognized as important risk factors for autonomic nervous system function and cardiovascular health in adolescents. Heart rate variability (HRV) is a sensitive, noninvasive marker of autonomic regulation and cardiovascular adaptive capacity. Objective: To investigate the association between sleep schedule adherence and HRV parameters in adolescents. Methods: This cross-sectional observational study included 200 schoolchildren aged 15–16 years in grades 9–10 in Ust-Kamenogorsk, Kazakhstan. Sleep patterns and chronotypes were assessed using the Horne–Östberg Morningness–Eveningness Questionnaire. Based on bedtime, participants were classified into a regular sleep schedule group (n = 147) and an irregular sleep schedule group (n = 53). Heart rate variability was assessed with the VNS-Spectrum system (Neurosoft, Russia) under resting conditions and during an active orthostatic test. Time-domain, frequency-domain, and geometric HRV parameters were analyzed. Statistical analyses were conducted using IBM SPSS Statistics 25.0. Results: Adolescents with a regular sleep schedule had significantly lower heart rate and higher RRNN, SDNN, RMSSD, pNN50, total power (TP), and high-frequency (HF) values than those with an irregular sleep schedule (all p < 0.001). The LF/HF ratio and stress index (SI) were also significantly lower, indicating predominant parasympathetic activity and more effective autonomic regulation. During the orthostatic test, both groups showed physiological sympathetic activation; however, adolescents with a regular sleep schedule maintained significantly higher HRV indices, reflecting greater cardiovascular adaptive capacity. In contrast, adolescents with an irregular sleep schedule showed reduced HRV, greater sympathetic predominance, elevated stress index, and diminished autonomic functional reserves. Conclusions: A regular sleep schedule is associated with more favorable autonomic regulation, higher HRV, and greater cardiovascular adaptive capacity in adolescents. In contrast, irregular sleep patterns are associated with sympathetic predominance, reduced vagal modulation, and diminished cardiovascular functional reserve. These findings underscore the importance of sleep hygiene interventions and healthy sleep habits as preventive strategies for preserving cardiovascular health in adolescents. | ||
| کلیدواژه‌ها | ||
| Adolescents health؛ Sleep schedule؛ Sleep hygiene؛ Heart rate variability؛ HRV؛ Autonomic nervous system؛ Parasympathetic activity؛ Sympathetic activity؛ Cardiovascular adaptation؛ Chronotype؛ Orthostatic test | ||
| مراجع | ||
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