John M Kowalchuk
Overview
Explore the profile of John M Kowalchuk including associated specialties, affiliations and a list of published articles.
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71
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1312
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Recent Articles
1.
Love L, Hodgson M, Keir D, Kowalchuk J
J Appl Physiol (1985)
. 2023 Jul;
135(3):584-600.
PMID: 37439241
A step-transition in external work rate (WR) increases pulmonary O uptake (V̇o) in a monoexponential fashion. Although the rate of this increase, quantified by the time constant (τ), has frequently...
2.
Ward A, Guluzade N, Kowalchuk J, Keir D
Eur J Appl Physiol
. 2022 Nov;
123(3):509-522.
PMID: 36371597
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...
3.
Love L, Hodgson M, Keir D, Kowalchuk J
Exp Physiol
. 2021 Nov;
107(1):82-93.
PMID: 34731518
New Findings: What is the central question of this study? During exercise, there are fluctuations in conduit artery blood flow (BF) caused by both cardiac and muscle contraction-relaxation cycles. What...
4.
Keir D, Iannetta D, Maturana F, Kowalchuk J, Murias J
Sports Med
. 2021 Oct;
52(2):237-255.
PMID: 34694596
During incremental exercise, two thresholds may be identified from standard gas exchange and ventilatory measurements. The first signifies the onset of blood lactate accumulation (the lactate threshold, LT) and the...
5.
Hodgson M, Keir D, Copithorne D, Rice C, Kowalchuk J
J Appl Physiol (1985)
. 2018 Apr;
125(2):304-312.
PMID: 29698107
In ramp-incremental cycling exercise, some individuals are capable of producing power output (PO) in excess of that produced at their limit of tolerance (LoT) whereas others cannot. This study sought...
6.
Keir D, Paterson D, Kowalchuk J, Murias J
Appl Physiol Nutr Metab
. 2018 Mar;
43(9):882-892.
PMID: 29570982
Despite compelling evidence to the contrary, the view that oxygen uptake (V̇O) increases linearly with exercise intensity (e.g., power output, speed) until reaching its maximum persists within the exercise physiology...
7.
Keir D, Pollock M, Thuraisingam P, Paterson D, Heigenhauser G, Rossiter H, et al.
Respir Physiol Neurobiol
. 2018 Feb;
251:41-49.
PMID: 29477729
We examined whether slower pulmonary O uptake (V˙O) kinetics in hypoxia is a consequence of: a) hypoxia alone (lowered arterial O pressure), b) hyperventilation-induced hypocapnia (lowered arterial CO pressure), or...
8.
Nederveen J, Keir D, Love L, Rossiter H, Kowalchuk J
Respir Physiol Neurobiol
. 2016 Nov;
235:62-70.
PMID: 27693390
We examined the effect of heavy-intensity 'priming' exercise on the rate of adjustment of pulmonary O uptake (τV˙O) initiated from elevated intensities. Fourteen men (separated into two groups: τV˙O≤25s [Fast]...
9.
Keir D, Copithorne D, Hodgson M, Pogliaghi S, Rice C, Kowalchuk J
J Appl Physiol (1985)
. 2016 Jun;
121(2):493-502.
PMID: 27339183
During constant-power output (PO) exercise above lactate threshold (LT), pulmonary O2 uptake (V̇o2 p) features a developing slow component (V̇o2 pSC). This progressive increase in O2 cost of exercise is...
10.
Keir D, Benson A, Love L, Robertson T, Rossiter H, Kowalchuk J
J Appl Physiol (1985)
. 2015 Dec;
120(5):503-13.
PMID: 26679614
The pulmonary O2 uptake (V̇o2p) response to ramp-incremental (RI) exercise increases linearly with work rate (WR) after an early exponential phase, implying that a single time constant (τ) and gain...