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Does depth of squat-stand maneuver affect estimates of dynamic cerebral autoregulation?

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posted on 2021-05-10, 09:16 authored by Angus P Batterham, Ronney B Panerai, Thompson G Robinson, Victoria J Haunton
Repeated squat-stand maneuvers (SSM) are an effective way of measuring dynamic cerebral autoregulation (dCA), but the depth of SSM required to improve dCA estimations has never been studied. We compared beat-to-beat cerebral hemodynamic parameters between maximal depth SSM (SSMD ) and a shallower alternative (SSMS ) in two age groups (younger [20-34 years] vs. older [50-71 years]) at a frequency of 0.05 Hz. Cerebral blood flow velocity, continuous blood pressure (BP) and end-tidal CO2 (EtCO2 ) were measured using transcranial Doppler ultrasound, the Finometer device, and capnography, respectively. Coherence (at 0.05 Hz) was significantly higher in both SSM recordings compared to spontaneous BP oscillations at baseline standing (BS ). Median (IQR) autoregulation index (ARI) was reduced during SSMD (4.46 [4.03-5.22], p < .01) compared to SSMS (5.96 [5.40-6.69]) and BS (6.03 [5.20-6.49], p < .01) with similar relative differences also observed for phase (at 0.05 Hz). End-tidal CO2 was increased in SSMD (38.3 ± 3.7 mmHg, p < .01) compared to both SSMS (36.6 ± 3.6 mmHg) and BS (35.5 ± 3.2 mmHg). The older group demonstrated significantly lower ARI and phase estimates during SSM and found SSMS more effortful than SSMD . In conclusion, both SSMD and SSMS are effective at estimating dCA, and dCA appears to be less efficient during maximal depth SSM compared to baseline rest or a shallower alternative.

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Citation

Batterham, AP, Panerai, RB, Robinson, TG, Haunton, VJ. Does depth of squat‐stand maneuver affect estimates of dynamic cerebral autoregulation?. Physiol Rep. 2020; 8:e14549. https://doi.org/10.14814/phy2.14549

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  • VoR (Version of Record)

Published in

Physiological reports

Volume

8

Issue

16

Pagination

e14549 - e14549

Publisher

Wiley Open Access [University Publisher] American Physiological Society [Associate Organisation] Physiological Society [Associate Organisation]

issn

2051-817X

eissn

2051-817X

Acceptance date

2020-07-29

Copyright date

2020

Available date

2021-05-10

Spatial coverage

United States

Language

eng

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