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Effect of rarefied air in a Mediterranean cave at cardiovascular level in humans
Ignasi de Yzaguirre y Mauraa, Gonzalo Graziolib, Monica Domènech Feira-Carotc, Diego Dulanto Zabalad, Marta Sitges Carreñob, Josep Antoni Gutiérrez Rincóna
a Medicina Deportiva, Consejo Catalán del Deporte, Gobierno de Cataluña, Barcelona, España
b Servicio de Cardiología, Instituto del Tórax, Hospital Clínico de Barcelona, Barcelona, España
c Unidad de HTA y RCV, Medicina Interna, ICMiD, Hospital Clínico de Barcelona, Barcelona, España
d Servicio de Anestesiología y Reanimación, Hospital Universitario Basurto, Bilbao, España
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        "resumen" => "<p class="elsevierStylePara"> <span class="elsevierStyleItalic">Introduction</span>&#58; Study of physiological adaptation in people breathing rarefied air in a cave&#46;</p> <p class="elsevierStylePara"> <span class="elsevierStyleItalic">Objective</span>&#58; To investigate the arrhythmogenic capacity of rarefied air and changes the autonomic nervous system &#40;sympathetic and parasympathetic&#41;&#46; To establish cutoff levels beyond which preventive measures must be taken&#46;</p> <p class="elsevierStylePara"> <span class="elsevierStyleItalic">Method</span>&#58; The study included 25 cavers&#44; monitored by ECG Holter and blood pressure measurements in 2 situations at rest&#44; one outside the cave breathing normal air composition &#40;NA&#41;&#44; and the other underground&#44; breathing rarefied air of natural origin &#40;RA&#41; in a confined space &#40;O2&#58; 13&#46;38 &#177; 1&#46;5&#37; and CO2&#58; 2&#46;23 &#177; 0&#46;31&#37;&#41;&#46;</p> <p class="elsevierStylePara"> <span class="elsevierStyleItalic">Results</span>&#58; Resting heart rate &#40;NA&#58; 81&#46;9 &#177; 15&#46;1 beats per minute &#40;bpm&#41; vs&#46; RA&#58; 83&#46;8 &#177; 17&#46;3 bpm&#59; P &#8804; &#46;58&#41;&#46; Systolic blood pressure &#40;NA&#58; 130&#46;3 &#177; 17&#46;2 mmHg vs&#46; RA&#58; 140&#46;2 &#177; 21&#46;3 mmHg&#59; P &#8804; &#46;0003&#41;&#46; Diastolic blood pressure &#40;NA&#58; 78&#46;2 &#177; 11&#46;0 mmHg vs&#46; RA&#58; 85&#46;5 &#177; 11&#46;2 mmHg&#59; P &#8804; &#46;0002&#41;&#46; Heart rate variability&#58; RMSSD &#40;NA&#58; 25&#46;9 &#177; 13&#46;8 ms vs&#46; RA&#58; 36&#46;9 &#177; 17&#46;8 ms&#59; P &#8804; &#46;003&#41;&#44; NN50 &#40;NA&#58; 49&#46;0 &#177; 66&#46;2 bpm vs&#46; RA&#58; 111&#46;7 &#177; 102&#46;8 bpm&#59; P &#8804; &#46;003&#41;&#59; pNN50 &#40;NA&#58; 11&#46;3&#37; &#177; 7&#46;5 vs&#46; RA&#58; 15&#46;9 &#177; 15&#46;8&#37;&#59; P &#8804; &#46;0013&#41;&#46; Fourier analysis&#58; TP &#40;NA&#58; 1&#44;759&#46;5 ms2 vs&#46; RA&#58; 2&#44;611&#46;5 ms2&#59; P &#8804; &#46;04&#41;&#59; HF &#40;NA&#58; 301&#46;5 &#177; 329&#46;4 ms2 vs&#46; RA&#58; 662&#46;3 &#177; 762&#46;8 ms2&#59; P &#8804; &#46;02&#41;&#46; An increase in arrhythmic events is detected when comparing the hour that included test 1 &#40;HNA&#41; in normal air with the hour that included test 2 &#40;HRA&#41; with rarefied air&#46; There is a correlation of arrhythmic events in both situations&#58; &#40;ventricular ectopic beats in RA&#41; &#61; 2&#46;9859 &#215; &#40;ventricular ectopic beats NA&#41; &#43; 1&#46;5622&#59; n &#61; 24&#59; r &#61; 0&#46;814&#59; P &#60;&#46;0001&#46;</p> <p class="elsevierStylePara"> <span class="elsevierStyleItalic">Conclusions</span>&#58; Exposure to RA at rest for 10 minutes causes a pressor response in systolic and diastolic blood pressure compared to normal air &#40;NA&#41;&#46; Heart rate variability in a standardised situation and rest shows a parasympathetic response&#44; with increased rMSSD and HF parameters when subjects are subjected to an atmosphere of RA&#46; In RA&#44; the subjects had three times more arrhythmic events when compared to NA&#46;</p> <p class="elsevierStylePara"> &#169; 2016 Consell Catal&#224; de l&#8217;Esport&#46; Generalitat de Catalunya&#46; Published by Elsevier Espa&#241;a&#44; S&#46;L&#46;U&#46; All rights reserved&#46;</p>"
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Article information
ISSN: 18866581
Original language: Spanish
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