Oxygenation time course and neuromuscular fatigue during repeated cycling sprints with bilateral blood flow restriction.

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License: CC BY 4.0
Serval ID
serval:BIB_88C97AEDFA3E
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Oxygenation time course and neuromuscular fatigue during repeated cycling sprints with bilateral blood flow restriction.
Journal
Physiological reports
Author(s)
Willis S.J., Alvarez L., Borrani F., Millet G.P.
ISSN
2051-817X (Electronic)
ISSN-L
2051-817X
Publication state
Published
Issued date
09/2018
Peer-reviewed
Oui
Volume
6
Number
19
Pages
e13872
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
The aim was to evaluate changes in peripheral and cerebral oxygenation, cardiorespiratory, and performance differences, as well as neuromuscular fatigue across multiple levels of blood flow restriction (BFR) during a repeated cycling sprint test to exhaustion (RST). Participants performed three RST (10-sec maximal sprints with 20-sec recovery until exhaustion) with measurements of power output and V̇O <sub>2peak</sub> as well as oxygenation (near-infrared spectroscopy) of the vastus lateralis and prefrontal cortex. Neuromuscular fatigue was assessed by femoral nerve stimulation to evoke the vastus lateralis. Tests were conducted with proximal lower limb bilateral vascular occlusion at 0%, 45%, and 60% of resting pulse elimination pressure. Total work decreased with BFR (52.5 ± 22.9% at 45%, 68.6 ± 32.6% at 60%, P < 0.01 compared with 0%) as V̇O <sub>2peak</sub> (12.6 ± 9.3% at 45%, 18.2 ± 7.2% at 60%, compared with 0%, P < 0.01). Decreased changes in muscle deoxyhemoglobin (∆[HHb]) during sprints were demonstrated at 60% compared to 0% (P < 0.001). Changes in total hemoglobin concentrations (∆[tHb]) increased at both 45% and 60% compared with 0% (P < 0.001). Cerebral ∆[tHb] increased toward exhaustion (P < 0.05). Maximal voluntary contraction (MVC), voluntary activation level (VAL), and root mean square (RMS)/M-wave ratio decreased at 60% compared with 0% (P < 0.001, all). MVC and VAL decreased between 45% and 60% (P < 0.05, both). The application of BFR during RST induced greater changes in tissue perfusion (via blood volume, ∆[tHb]) suggesting a possible stimulus for vascular blood flow regulation. Additionally, high-intensity sprint exercise with partial ischemia may challenge cerebral blood flow regulation and influence local fatigue development due to protection of cerebral function.
Keywords
Adult, Bicycling/physiology, Blood Flow Velocity/physiology, Female, Humans, Male, Muscle Contraction/physiology, Muscle Fatigue/physiology, Oxygen Consumption/physiology, Spectroscopy, Near-Infrared/methods, Ultrasonography, Doppler/methods, Young Adult, BFR , central fatigue, occlusion, perfusion
Pubmed
Web of science
Open Access
Yes
Create date
29/10/2018 18:52
Last modification date
28/09/2019 6:08
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