@article{ref1,
title="Impact of hanging motionless in harness on respiratory and blood pressure reflex modulation in mountain climbers",
journal="High altitude medicine and biology",
year="2019",
author="Lanfranconi, Francesca and Ferri, Alessandra and Pollastri, Luca and Bartesaghi, Manuela and Novarina, Massimiliano and De Vito, Giovanni and Beretta, Egidio and Tremolizzo, Lucio",
volume="20",
number="2",
pages="122-132",
abstract="Harness hang syncope (HHS) is a risk that specifically affects safety of harness' users in mountain climbing. <b>                         <i>Aims:</i>                     </b> To evaluate individual patterns of breathing resulting from deranged cardiovascular reflexes triggering a syncopal event when a mismatch between cerebral O<sub>2</sub> demand and supply is present. <b>                         <i>Results:</i>                     </b> Forty healthy participants [aged 39.1 (8.2) years] were enrolled in a motionless suspension test while hanging in harness. Respiratory gas exchange values were analyzed to assess the pattern of breathing (EpInW<sub>el</sub>, respiratory elastic power) and cardiovascular parameters were monitored (BP, blood pressure). Four participants experienced HHS after 30.0 (7.6) minutes, with an early manifestation of loss of control of both a sustainable EpInW<sub>el</sub> and BP, starting after 10-12 minutes. Among the other participants, two different reactions were observed during suspension: (1) group G1 tolerated 32.7 (11.4) minutes of suspension by a favorable adaptation of the EpInW<sub>el</sub> and BP parameters and (2) group G2 showed significantly shorter time of suspension 24.0 (10.4) minutes with unfavorable increase in EpInW<sub>el</sub> and BP. <b>                         <i>Conclusions:</i>                     </b> Greater resistance to HHS occurs in people developing less marked fluctuations of both respiratory and cardiovascular reflex responses. Conversely, wider fluctuations both in control of EpInW<sub>el</sub> and BP were observed in the event of decreased suspension tolerance or in syncopal events.<p /> <p>Language: en</p>",
language="en",
issn="1527-0297",
doi="10.1089/ham.2018.0089",
url="http://dx.doi.org/10.1089/ham.2018.0089"
}