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View article: Factors Affecting VO<sub>2</sub> and Fat Oxidation Responses During Step Incremental Exercise
Factors Affecting VO<sub>2</sub> and Fat Oxidation Responses During Step Incremental Exercise Open
Step incremental exercise tests are widely used to assess endurance performance determinants; however, to what extent step duration influences oxygen uptake (V̇O 2 ) and carbon dioxide production (V̇CO 2 ) is unclear. This study assessed the…
View article: Blue plaque review series: A.V. Hill, athletic records and the birth of exercise physiology
Blue plaque review series: A.V. Hill, athletic records and the birth of exercise physiology Open
One hundred years ago, A.V. Hill authored three manuscripts analysing athletic world records from a physiological perspective. That analysis, grounded in Hill's understanding of contemporary muscle bioenergetics, provides a fascinating ske…
View article: Modelling Loss of Complexity in Intermittent Time Series and its Application
Modelling Loss of Complexity in Intermittent Time Series and its Application Open
In this paper, we developed a novel method of nonparametric relative entropy (RlEn) for modelling loss of complexity in intermittent time series. The method consists of two steps. We first fit a nonlinear autoregressive model to each inter…
View article: Direct and Reagentless Atmospheric Pressure Photoionisation Mass Spectrometry: Rapid and Accurate Differentiation of Cystic Fibrosis Related Bacteria by Monitoring VOCs
Direct and Reagentless Atmospheric Pressure Photoionisation Mass Spectrometry: Rapid and Accurate Differentiation of Cystic Fibrosis Related Bacteria by Monitoring VOCs Open
Breath analysis is an area of significant interest in medical research as it allows for non-invasive sampling with exceptional potential for disease monitoring and diagnosis. Volatile organic compounds (VOCs) found in breath can offer crit…
View article: No sex differences in oxygen uptake or extraction kinetics in the moderate or heavy exercise intensity domains
No sex differences in oxygen uptake or extraction kinetics in the moderate or heavy exercise intensity domains Open
This study demonstrated no sex differences in the oxidative response to moderate- and heavy-intensity cycling exercise. The change in oxygen uptake and deoxyhemoglobin were modeled with monoexponential curve fitting, which revealed no diff…
View article: No sex differences in oxygen uptake or extraction kinetics in the moderate or heavy exercise intensity domains
No sex differences in oxygen uptake or extraction kinetics in the moderate or heavy exercise intensity domains Open
The integrative response to exercise differs between sexes, with oxidative energy contribution purported as a potential mechanism. The present study investigated whether this difference was evident in the kinetics of oxygen uptake (V□O 2 )…
View article: The Application of non-linear methods to quantify changes to movement dynamics during running: A scoping review
The Application of non-linear methods to quantify changes to movement dynamics during running: A scoping review Open
The aim of this scoping review was to evaluate research approaches that quantify changes to non-linear movement dynamics during running in response to fatigue, different speeds, and fitness levels. PubMed and Scopus were used to identify a…
View article: Invited review: The speed-duration relationship across the animal kingdom
Invited review: The speed-duration relationship across the animal kingdom Open
The parameters of the hyperbolic speed-duration relationship (the asymptote critical speed, CS, and the curvature constant, D') provide estimates of the maximal steady state speed (CS) and the distance an animal can run, swim, or fly at sp…
View article: Louis Passfield—A Role Model for the Mission of IJSPP
Louis Passfield—A Role Model for the Mission of IJSPP Open
On November 12, 2022, we got the sad news that Professor Louis
\nPassfield had passed way. Our thoughts are now with Louis’s family
\nand friends. He was a remarkable and respected man, an inspiration as
\na person, leader, scientist, and …
View article: <scp><sup>15</sup>N</scp>‐labeled dietary nitrate supplementation increases human skeletal muscle nitrate concentration and improves muscle torque production
<span><sup>15</sup>N</span>‐labeled dietary nitrate supplementation increases human skeletal muscle nitrate concentration and improves muscle torque production Open
Aim Dietary nitrate (NO 3 − ) supplementation increases nitric oxide bioavailability and can enhance exercise performance. We investigated the distribution and metabolic fate of ingested NO 3 − at rest and during exercise with a focus on s…
View article: Physiological complexity: influence of ageing, disease and neuromuscular fatigue on muscle force and torque fluctuations
Physiological complexity: influence of ageing, disease and neuromuscular fatigue on muscle force and torque fluctuations Open
New Findings What is the topic of this review? Physiological complexity in muscle force and torque fluctuations, specifically the quantification of complexity, how neuromuscular complexityis altered by perturbations and the potential mecha…
View article: Influence of simulated hypogravity on oxygen uptake during treadmill running
Influence of simulated hypogravity on oxygen uptake during treadmill running Open
Prolonged exposure to microgravity during spaceflights leads to severe deterioration in the physical performance of astronauts. To understand the effectiveness of existing in-flight daily countermeasures and to plan exercise onboard the In…
View article: Acute Quadriceps Muscle Pain Reduces Isometric Endurance Performance of the Contralateral Limb
Acute Quadriceps Muscle Pain Reduces Isometric Endurance Performance of the Contralateral Limb Open
Intro: Non-local muscle pain may impair neuromuscular fatigue and endurance performance, but the mechanisms are unknown. This study examined the effects of muscle pain on neuromuscular performance of the contralateral limb. Methods: On sep…
View article: The Effect of Elevated Muscle Pain on Neuromuscular Fatigue during Exercise
The Effect of Elevated Muscle Pain on Neuromuscular Fatigue during Exercise Open
Purpose: Muscle pain can impair exercise performance but the mechanisms for this are unknown. This study examined the effects of muscle pain on neuromuscular fatigue during an endurance task. Methods: On separate visits, twelve participant…
View article: Ischemic Preconditioning Blunts Loss of Knee Extensor Torque Complexity with Fatigue
Ischemic Preconditioning Blunts Loss of Knee Extensor Torque Complexity with Fatigue Open
Introduction Neuromuscular fatigue reduces the temporal structure, or complexity, of muscle torque output, purportedly through an effect on motor unit behavior. Ischemic preconditioning (IPC), an emerging ergogenic aid, has been demonstrat…
View article: Physiological Evidence That the Critical Torque Is a Phase Transition, Not a Threshold
Physiological Evidence That the Critical Torque Is a Phase Transition, Not a Threshold Open
Introduction Distinct physiological responses to exercise occur in the heavy- and severe-intensity domains, which are separated by the critical power or critical torque (CT). However, how the transition between these intensity domains actu…
View article: Response to considerations regarding Maximal Lactate Steady State determination before redefining the gold‐standard
Response to considerations regarding Maximal Lactate Steady State determination before redefining the gold‐standard Open
We reinforce the key messages in our earlier review paper that critical power, rather than maximal lactate steady state, provides the better index for defining steady-state vs non-steady state physiological behaviour during exercise.
View article: Ischaemic pre-conditioning attenuates fatigue-induced loss of knee extensor torque complexity during submaximal intermittent isometric contractions
Ischaemic pre-conditioning attenuates fatigue-induced loss of knee extensor torque complexity during submaximal intermittent isometric contractions Open
Neuromuscular fatigue reduces the temporal structure, or complexity, of muscle torque output. Ischaemic pre-conditioning (IPC) has been demonstrated to have a potent effect on motor output. We therefore tested the hypothesis that IPC would…
View article: Relationship between muscle metabolic rate and muscle torque complexity during fatiguing intermittent isometric contractions in humans
Relationship between muscle metabolic rate and muscle torque complexity during fatiguing intermittent isometric contractions in humans Open
To test the hypothesis that a system's metabolic rate and the complexity of fluctuations in the output of that system are related, thirteen healthy participants performed intermittent isometric knee extensor contractions at intensities whe…
View article: The maximal metabolic steady state: redefining the ‘gold standard’
The maximal metabolic steady state: redefining the ‘gold standard’ Open
The maximal lactate steady state (MLSS) and the critical power (CP) are two widely used indices of the highest oxidative metabolic rate that can be sustained during continuous exercise and are often considered to be synonymous. However, wh…
View article: Fatigue reduces the complexity of knee extensor torque during fatiguing sustained isometric contractions
Fatigue reduces the complexity of knee extensor torque during fatiguing sustained isometric contractions Open
The temporal structure, or complexity, of muscle torque output reflects the adaptability of motor control to changes in task demands. This complexity is reduced by neuromuscular fatigue during intermittent isometric contractions. We tested…
View article: Prolonged depression of knee‐extensor torque complexity following eccentric exercise
Prolonged depression of knee‐extensor torque complexity following eccentric exercise Open
New Findings What is the central question of this study? Does eccentric exercise leading to prolonged knee‐extensor torque depression also result in a prolonged loss of knee‐extensor torque complexity? What is the main finding and its impo…
View article: Prolonged depression of knee extensor torque complexity following eccentric exercise
Prolonged depression of knee extensor torque complexity following eccentric exercise Open
Neuromuscular fatigue reduces the complexity of muscle torque output. Exercise-induced muscle damage reduces muscle torque output for considerably longer than high-intensity fatiguing contractions. We therefore hypothesized that muscle dam…