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Knee-high compression socks minimize head-up tilt-induced cerebral and cardiovascular responses following dynamic exercise.
Dorey, T W; O'Brien, M W; Robinson, S A; Kimmerly, D S.
Affiliation
  • Dorey TW; School of Health and Human Performance, Division of Kinesiology, Dalhousie University, Halifax, NS, Canada.
  • O'Brien MW; School of Health and Human Performance, Division of Kinesiology, Dalhousie University, Halifax, NS, Canada.
  • Robinson SA; School of Health and Human Performance, Division of Kinesiology, Dalhousie University, Halifax, NS, Canada.
  • Kimmerly DS; School of Health and Human Performance, Division of Kinesiology, Dalhousie University, Halifax, NS, Canada.
Scand J Med Sci Sports ; 28(7): 1766-1774, 2018 Jul.
Article in En | MEDLINE | ID: mdl-29575406
ABSTRACT
In healthy individuals during a non-exercised state, knee-high compression socks (CS) may reduce the magnitude of lower limb venous pooling during orthostasis but are not effective at minimizing the incidence of pre-syncopal symptoms. However, exaggerated reductions in cerebral blood flow velocity (CBV) and cardiac stroke volume (SV) occur during passive head-up tilt (HUT) testing following dynamic exercise. It is unknown if CS can minimize post-exercise HUT-induced decrements in CBV and SV in this population. To test the hypothesis that CS will attenuate the reductions in SV and CBV during 60° HUT following 60 minutes of moderate-intensity (60% VO2 peak) cycling exercise. Ten healthy volunteers (22.6 ± 2.1 years, 24.1 ± 2.5 kg/m2 ) completed pre- and post-exercise 15-minute HUT tests during randomized CS and Control (no CS) conditions. Changes in blood pressure (finger plethysmography), SV (Modelflow® method), and CBV (Transcranial Doppler) were measured during HUT and preceding supine rest periods. Pre-exercise HUT-induced similar (all, P > .47) reductions in SV (Control; -23.1 ± 11.5%, CS; -20.5 ± 10.9%) and CBV (Control; -18.1 ± 6.3%, CS; -15.3 ± 9.0%). However, larger post-exercise decreases in SV and CBV during HUT were observed in the Control versus CS condition. Specifically, CS attenuated the drop in SV (Control -32.9 ± 5.6%, CS -24.3 ± 11.6%; P = .01) and CBV (Control -25.1 ± 5.8%, CS -17.6 ± 7.8%; P = .02) during the post-exercise HUT test. These results indicate that CS attenuated HUT-induced reductions in SV and CBV following moderate-intensity cycling exercise and suggest that CS may be an effective countermeasure to reduce the incidence of post-exercise syncope in vulnerable populations.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Stroke Volume / Syncope / Exercise / Cerebrovascular Circulation / Stockings, Compression Type of study: Clinical_trials Limits: Adult / Female / Humans / Male Language: En Journal: Scand J Med Sci Sports Journal subject: MEDICINA ESPORTIVA Year: 2018 Type: Article Affiliation country: Canada

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Stroke Volume / Syncope / Exercise / Cerebrovascular Circulation / Stockings, Compression Type of study: Clinical_trials Limits: Adult / Female / Humans / Male Language: En Journal: Scand J Med Sci Sports Journal subject: MEDICINA ESPORTIVA Year: 2018 Type: Article Affiliation country: Canada