The effect of severe intensity bouts on muscle oxygen saturation responses in trained cyclists

Bibliographic Data

ID13130430
AuthorsAssaf Yogev (University of British Columbia, corresponding author), Jem Arnold (0000-0003-3908-9447, University of British Columbia), Hannah Nelson (0000-0003-0963-1450, University of British Columbia), David C Clarke (0000-0002-1520-5426, Simon Fraser University), Jordan A Guenette (0000-0002-4387-4547, St. Paul's Hospital), Ben C Sporer (Spinal Cord Injury BC), Michael S Koehle (0000-0001-7026-8422, Simon Fraser University, corresponding author)
Year2023
Volume5
Pages1086227-1086227
Publication date2023-02-23
Open AccessYes
TypeARTICLE
VenueFrontiers in Sports and Active Living (JOURNAL)
Journal identifiersISSN: 2624-9367 • E-ISSN: 2624-9367
PublisherFrontiers Media (PUBLISHER • CH)
DOI10.3389/fspor.2023.1086227
PMID36909360
OpenAlexW4321598112
LanguageEN
References cited51

Near-infrared spectroscopy (NIRS) quantifies muscle oxygenation (SmO 2 ) during exercise. Muscle oxygenation response to self-paced, severe-intensity cycling remains unclear. Observing SmO 2 can provide cycling professionals with the ability to assess muscular response, helping optimize decision-making. We aimed to describe the effect of self-paced severe intensity bouts on SmO 2 , measured noninvasively by a wearable NIRS sensor on the vastus lateralis (VL) muscle, and examine its reliability. We hypothesized a greater desaturation response with each bout, whereas, between trials, good reliability would be observed. Fourteen recreationally trained, and trained cyclists completed a ramp test to determine the power output (PO) at the respiratory compensation point (RCP). Athletes completed two subsequent visits of 50-minute sessions that included four severe-intensity bouts done at 5% above RCP PO. Muscle oxygenation in the VL was monitored using a wearable NIRS device. Measures included mean PO, heart-rate (HR), cadence, and SmO 2 at bout onset, during work (work SmO 2 ), and Δ SmO 2 . The bouts were compared using a one-way repeated measures ANOVA. For significant differences, a Fisher's least square difference post-hoc analysis was used. A two-way repeated measures ANOVA was used using trial and bout as main factors. Intraclass correlations (ICC) were used to quantify relative reliability for mean work, and standard error of the measurement (SEM) was used to quantify absolute agreement of mean work SmO 2 . Both PO and cadence showed no effect of bout or trial. Heart-rate at bout 2 (168 ± 8 bpm) and 4 (170 ± 7 bpm) were higher than bout 1 (160 ± 6 bpm). Onset SmO 2 (%) response significantly increased in the final two bouts of the session. Mean work SmO 2 increased across bouts, with the highest value displayed in bout 4 (36 ± 22%). Δ SmO 2 showed a smaller desaturation response during bout 4 (27 ± 10%) compared to bout 3 (31 ± 10%). Mean work SmO 2 ICC showed good reliability (ICC = 0.87), and SEM was 12% (CI 9-15%). We concluded that a non-invasive, affordable, wearable NIRS sensor demonstrated the heterogeneous muscle oxygenation response during severe intensity cycling bouts with good reliability in trained cyclists

Anaerobic exercise · Blood pressure · Cadence · Cardiology · Cycling · Exercise intensity · Heart rate · Physical medicine and rehabilitation · Physical therapy · Repeated measures design · Respiratory compensation · Time trial · Cardiovascular and exercise physiology · Heart Rate Variability and Autonomic Control · Mathematics · Medicine · Sports Performance and Training · Internal Medicine

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