A comparison of critical power and the respiratory compensation point at slower and faster pedaling cadences.

We investigated whether pedal cadence (60 vs. 100 rpm) affects oxygen uptake (V̇O) and power output (PO) at two indexes of the heavy-to-severe-intensity domain boundary (i.e.

A modified step-ramp-step protocol to prescribe constant-speed exercise in treadmill running.

Purpose: This study investigated whether a running-adapted version of the cycling-based "step-ramp-step" (SRS) protocol would improve prediction of O in treadmill exercise compared to the traditional prescriptive approach.

Methods: Fourteen healthy individuals (6 females; 25 ± 6 years; 66.1 ± 12.

Nature-based interventions for physical health conditions: A systematic review and meta-analysis.

Nature-based interventions (NBIs) are activities, strategies, or programs taking place in natural settings, such as exercising in greenspaces, to improve the health and well-being of people by integrating the benefits of nature exposure with healthy behaviours. Current reviews on NBIs do not report the effects on different groups of physical health conditions. The purpose of this systematic review and meta-analysis was to identify and synthesize the evidence of the effect of NBIs on physical health outcomes and biomarkers of physical health conditions.

The ventilatory response to modified rebreathing is unchanged by hyperoxic severity: implications for the hyperoxic hyperventilation paradox.

Normobaric hyperoxia stimulates ventilation (V̇e) in a time- and dose-dependent manner. Whether this occurs via an oxygen (O)-specific mechanism or secondary to carbon dioxide (CO) retention at the central chemoreceptors remains unclear. We measured the ventilatory response to hyperoxic CO rebreathing with O clamped at increasingly higher pressures.

A test of the interaction between central and peripheral respiratory chemoreflexes in humans.

How central and peripheral chemoreceptor drives to breathe interact in humans remains contentious. We measured the peripheral chemoreflex sensitivity to hypoxia (PChS) at various isocapnic CO tensions ( ) to determine the form of the relationship between PChS and central . Twenty participants (10F) completed three repetitions of modified rebreathing tests with end-tidal ( ) clamped at 150, 70, 60 and 45 mmHg.

Coupling of [Formula: see text] and [Formula: see text] kinetics: insights from multiple exercise transitions below the estimated lactate threshold.

During a step-change in exercise power output (PO), ventilation ([Formula: see text]) increases with a similar time course to the rate of carbon dioxide delivery to the lungs ([Formula: see text]). To test the strength of this coupling, we compared [Formula: see text] and [Formula: see text] kinetics from ten independent exercise transitions performed within the moderate-intensity domain. Thirteen males completed 3-5 repetitions of ∆40 W step transitions initiated from 20, 40, 60, 80, 100, and 120 W on a cycle ergometer.

Strategies to improve respiratory chemoreflex characterization by Duffin's rebreathing.

New Findings: What is the central question of this study? We assessed the test-retest variability of respiratory chemoreflex characterization by Duffin's modified rebreathing method and explored whether signal averaging of repeated trials improves confidence in parameter estimation. What is the main finding and its importance? Modified rebreathing is a reproducible method to characterize responses of central and peripheral respiratory chemoreflexes. Signal averaging of multiple repeated tests minimizes within- and between-test variability, improves the confidence of chemoreflex characterization and reduces the minimal change in parameters required to establish an effect.