scholarly journals Dynamic asymmetry of phosphocreatine concentration and O 2 uptake between the on‐ and off‐transients of moderate‐ and high‐intensity exercise in humans

2002 ◽  
Vol 541 (3) ◽  
pp. 991-1002 ◽  
Author(s):  
H. B. Rossiter ◽  
S. A. Ward ◽  
J. M. Kowalchuk ◽  
F. A. Howe ◽  
J. R. Griffiths ◽  
...  
Keyword(s):  
High Intensity ◽  
High Intensity Exercise ◽  
Exercise In Humans

Carbohydrates do not accelerate force recovery after glycogen‐depleting followed by high‐intensity exercise in humans

2020 ◽  
Vol 30 (6) ◽  
pp. 998-1007
Author(s):  
Arthur J. Cheng ◽  
Thomas Chaillou ◽  
Sigitas Kamandulis ◽  
Andrejus Subocius ◽  
Håkan Westerblad ◽  
...  
Keyword(s):  
High Intensity ◽  
High Intensity Exercise ◽  
Force Recovery ◽  
Exercise In Humans ◽  
Accelerate Force

scholarly journals Haemodynamic and metabolic responses of the lower limb after high intensity exercise in humans

1996 ◽  
Vol 81 (2) ◽  
pp. 173-187 ◽  
Author(s):  
ST Hussain ◽  
RE Smith ◽  
S Medbak ◽  
RF Wood ◽  
BJ Whipp
Keyword(s):  
Lower Limb ◽  
High Intensity ◽  
High Intensity Exercise ◽  
Metabolic Responses ◽  
Exercise In Humans

DISPERSION OF INTRAMUSCULAR pH PROFILES AND THE ???SLOW??? PHASE OF PULMONARY &OV0622;O2 KINETICS DURING HIGH-INTENSITY EXERCISE IN HUMANS

2001 ◽  
Vol 33 (5) ◽  
pp. S278
Author(s):  
H B. Rossiter ◽  
S A. Ward ◽  
J M. Kowalchuk ◽  
F A. Howe ◽  
J R. Griffiths ◽  
...  
Keyword(s):  
High Intensity ◽  
High Intensity Exercise ◽  
Slow Phase ◽  
Exercise In Humans ◽  
Intramuscular Ph ◽  
Ph Profiles

Ventilatory Control during Intermittent High-Intensity Exercise in Humans

2008 ◽  
pp. 203-208 ◽  
Author(s):  
Andrew J. Cathcart ◽  
Anthony P. Turner ◽  
Christopher Butterworth ◽  
Matthew Parker ◽  
John Wilson ◽  
...  
Keyword(s):  
High Intensity ◽  
High Intensity Exercise ◽  
Ventilatory Control ◽  
Exercise In Humans

Peripheral and Central Chemoreceptor Control of Ventilation During Exercise in Humans

1994 ◽  
Vol 19 (3) ◽  
pp. 305-333 ◽  
Author(s):  
Susan A. Ward
Keyword(s):  
Steady State ◽  
High Intensity ◽  
High Intensity Exercise ◽  
Moderate Exercise ◽  
Arterial Blood Gas ◽  
Respiratory Compensation ◽  
Arterial Blood ◽  
The Stability ◽  
Exercise In Humans ◽  
Humoral Control

The stability of arterial blood gas tensions and pH during steady-state moderate exercise has suggested an important humoral element of ventilatory control in humans. However, the involvement of central and peripheral chemoreflexes in this humoral control remains controversial. This reflects, in large part, technical and interpretational limitations inherent in currently used estimators of chemoreflexes "sensitivity." Evidence suggests that the central chemoreceptors (a) contribute little during moderate exercise, given the relative stability of cerebrospinal pH, (b) constrain the hyperpnea of high-intensity exercise, consequent to the respiratory compensation for the metabolic acidemia, and (c) may play a role in the respiratory compensation during chronic metabolic acidemia. In contrast, the peripheral chemoreceptors appear to (a) exert considerable influence on ventilatory kinetics in moderate exercise, but are less important in the steady state, and (b) induce much of the respiratory compensation of high-intensity exercise. Key words: medullary chemoreceptors, carotid chemoreceptors, hyperoxia, ventilatory dynamics, metabolic acidemia

Dietary nitrate supplementation reduces the O2cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans

2009 ◽  
Vol 107 (4) ◽  
pp. 1144-1155 ◽  
Author(s):  
Stephen J. Bailey ◽  
Paul Winyard ◽  
Anni Vanhatalo ◽  
Jamie R. Blackwell ◽  
Fred J. DiMenna ◽  
...  
Keyword(s):  
High Intensity ◽  
Submaximal Exercise ◽  
High Intensity Exercise ◽  
Moderate Intensity ◽  
Nitrate Content ◽  
Time To Exhaustion ◽  
Moderate Exercise ◽  
Dietary Nitrate ◽  
Nitrate Supplementation ◽  
Exercise In Humans

Pharmacological sodium nitrate supplementation has been reported to reduce the O2cost of submaximal exercise in humans. In this study, we hypothesized that dietary supplementation with inorganic nitrate in the form of beetroot juice (BR) would reduce the O2cost of submaximal exercise and enhance the tolerance to high-intensity exercise. In a double-blind, placebo (PL)-controlled, crossover study, eight men (aged 19–38 yr) consumed 500 ml/day of either BR (containing 11.2 ± 0.6 mM of nitrate) or blackcurrant cordial (as a PL, with negligible nitrate content) for 6 consecutive days and completed a series of “step” moderate-intensity and severe-intensity exercise tests on the last 3 days. On days 4–6, plasma nitrite concentration was significantly greater following dietary nitrate supplementation compared with PL (BR: 273 ± 44 vs. PL: 140 ± 50 nM; P < 0.05), and systolic blood pressure was significantly reduced (BR: 124 ± 2 vs. PL: 132 ± 5 mmHg; P < 0.01). During moderate exercise, nitrate supplementation reduced muscle fractional O2extraction (as estimated using near-infrared spectroscopy). The gain of the increase in pulmonary O2uptake following the onset of moderate exercise was reduced by 19% in the BR condition (BR: 8.6 ± 0.7 vs. PL: 10.8 ± 1.6 ml·min−1·W−1; P < 0.05). During severe exercise, the O2uptake slow component was reduced (BR: 0.57 ± 0.20 vs. PL: 0.74 ± 0.24 l/min; P < 0.05), and the time-to-exhaustion was extended (BR: 675 ± 203 vs. PL: 583 ± 145 s; P < 0.05). The reduced O2cost of exercise following increased dietary nitrate intake has important implications for our understanding of the factors that regulate mitochondrial respiration and muscle contractile energetics in humans.

Sign in / Sign up

Export Citation Format

Share Document