What is the clinical evidence from this study?

Study design: Observational. Population: Healthy cyclists (n=25). Intervention: Incremental cycling exercise (ramp test). Primary outcome: Location of breakpoints in cerebral and muscle oxygenation and muscle electrical activity relative to ventilatory thresholds.

April 11, 2014Frontiers in PhysiologyOpen Access

Breakpoints in ventilation, cerebral and muscle oxygenation, and muscle activity during an incremental cycling exercise

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Key result

During an incremental cycling exercise, cerebral oxygenation thresholds occurred concomitantly with both ventilatory thresholds, whereas muscle oxygenation and electrical activity thresholds occurred only at or after the second ventilatory threshold.

Population

25 cyclists

Authors

SRSébastien RacinaisUniversité Claude Bernard Lyon 1 MBMartin BuchheitPreventive Cardiology OGOlivier GirardThe University of Western Australia

Discussion

Member takes

Implication

May inform noninvasive threshold detection in athletes; leaves open validation and clinical translation.

Study Design

Type

Observational (n=25)

Multicenter

Structured PICO

Population

25 cyclists

Intervention

Maximal ramp test on an electromagnetically braked cycle-ergometer with a rate of increment of 25 W/min

Outcome

Breakpoints of cerebral and muscle oxygenation and muscle electrical activity in reference to the first and second ventilatory thresholdssurrogate

Metabolic and ventilatory events characterizing the second cardiopulmonary threshold may affect both cerebral and muscle oxygenation levels and muscle recruitment responses during incremental cycling exercise.

Limitations

Ventilatory responses could not be analyzed through the same automatized method as NIRS and EMG signals due to lower sampling frequency.
NIRS and EMG analyses were limited to a restricted number of sites (left prefrontal lobe and vastus lateralis for NIRS; vastus lateralis, rectus femoris, and biceps femoris for EMG).
Inability to detect an EMG threshold in some recordings, possibly due to compensations between synergistic muscles or inhomogeneous distribution of EMG activity.
Lack of PaCO2 or PETCO2 data to help interpret mechanisms responsible for changes in cerebral oxygenation.

Cite This Study

Racinais et al. (2014) conducted an observational in Healthy cyclists (n=25). Incremental cycling exercise (ramp test) was evaluated on Location of breakpoints in cerebral and muscle oxygenation and muscle electrical activity relative to ventilatory thresholds. During an incremental cycling exercise, cerebral oxygenation thresholds occurred concomitantly with both ventilatory thresholds, whereas muscle oxygenation and electrical activity thresholds occurred only at or after the second ventilatory threshold.

synapsesocial.com/papers/6a1c263ebc71fb1015a9475a https://doi.org/10.3389/fphys.2014.00142

View Full Paper

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Bookmark

Breakpoints in ventilation, cerebral and muscle oxygenation, and muscle activity during an incremental cycling exercise

Discussion

Member takes

Implication

Study Design

Structured PICO

Limitations

Cite This Study

Breakpoints in ventilation, cerebral and muscle oxygenation, and muscle activity during an incremental cycling exercise

Discussion

Member takes

Implication

Study Design

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider