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• W2474418634 abstract "To date, many studies have been performed to evaluate changes in heart rate variability in response to exercise at sea-level or following ascent to high altitude but none have been conducted with these two variables simultaneously to determine how these two stressors may interact with each other. PURPOSE: The purpose of this study was to focus on changes in SNS (sympathetic nervous system) and PNS (parasympathetic nervous system) activity following anaerobic exercise at altitude_ acutely and after acclimatization_ using measurements of heart rate variability including low frequency oscillations (LF, 0.04-0.15 Hz), high frequency oscillations (HF, 0.15-0.40 Hz) and LF/HF ratios. METHODS: Fifteen healthy subjects of average physical fitness (mean age of 20.3 ± 1.9) were recruited and completed four separate trials: at sea level (SL1), at 3417 m within 48 hours of arrival (ALT1), following two weeks of acclimatization (ALT2) and within 48 hours after returning to sea level (SL2). ECG was measured throughout the trials using the BioHarness System (Zephyr BioHarness, BIOPAC Systems, Inc.) with MP 150 hardware and AcqKnowledge 4.3 software. Resting measurements of heart rate (HR), arterial oxygen saturation (SpO2), and blood pressure (BP) were taken to establish a baseline. A 30 second Wingate test using 7% of the subject’s body weight was then performed using a cycle ergometer. Immediately following exercise the subject was seated and measurements were continued for ten minutes. RESULTS: The LF/HF ratio recorded over the first minute after exercise is highest (p<0.05) at ALT 1 (2.62 ± .50) relative to SL 1 (1.47 ± .32) or ALT2 (1.56 ±0.28). Furthermore, during the first minute after exercise there was a reduced HF at ALT1 relative to SL1 or ALT 2. CONCLUSION: Acute exposure at altitude resulted in increased sympathetic activity (LF/HF ratio) and reduced parasympathetic activation (HF) during the first minute immediately after anaerobic exercise. This indicates a coordinated effort to maintain an elevated heart rate after a severe challenge to the cardiac system compared to the other trials. This elevated SNS and reduced PNS begin returning to sea level values after acclimatization indicating a gradual reduction in heart rate— both before and after exercise_over time at altitude." @default.
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• W2474418634 date "2015-05-01" @default.
• W2474418634 modified "2023-10-14" @default.
• W2474418634 title "Heart Rate Variability after Anaerobic Exercise with Acute and Chronic Exposure to Moderate Altitude" @default.
• W2474418634 doi "https://doi.org/10.1249/01.mss.0000476535.69601.dc" @default.
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