Sensation of breathlessness and respiratory oxygen cost during cycle exercise with and without conscious entrainment of the breathing rhythm

1997 ◽  
Vol 76 (3) ◽  
pp. 209-213 ◽  
Author(s):  
Nariko Takano ◽  
Hisae Deguchi
Keyword(s):  
Oxygen Cost ◽  
Cycle Exercise

Continuous Estimation of CO2 Production during Exercise

1997 ◽  
Vol 36 (04/05) ◽  
pp. 368-371
Author(s):  
R. Soma ◽  
Y. Yamamoto
Keyword(s):  
Fuzzy Logic ◽  
Steady State ◽  
Infusion Rate ◽  
Feedback System ◽  
Whole Body ◽  
Co2 Production ◽  
Cycle Exercise ◽  
Continuous Estimation ◽  
Breath Measurement ◽  
13Co2 Enrichment

Abstract.A new method was developed for continuous isotopic estimation of human whole body CO2 rate of appearance (Ra) during non-steady state exercise. The technique consisted of a breath-by-breath measurement of 13CO2 enrichment (E) and a real-time fuzzy logic feedback system which controlled NaH13CO3 infusion rate to achieve an isotopic steady state. Ra was estimated from the isotope infusion rate and body 13CO2 enrichment which was equal to E at the isotopic steady state. During a non-steady state incremental cycle exercise (5 w/min or 10 w/min), NaH13CO3 infusion rate was successfully increased by the action of feedback controller so as to keep E constant.

Predicting the oxygen cost of walking in hemiparetic stroke patients

2018 ◽  
Vol 61 (5) ◽  
pp. 309-314 ◽  
Author(s):  
M. Compagnat ◽  
S. Mandigout ◽  
D. Chaparro ◽  
J.Y. Salle ◽  
J.C. Daviet
Keyword(s):  
Oxygen Cost ◽  
Stroke Patients ◽  
Hemiparetic Stroke

scholarly journals Time dependence of the oxygen cost of force development during systole in the canine left ventricle.

1986 ◽  
Vol 59 (1) ◽  
pp. 27-38 ◽  
Author(s):  
R Teplick ◽  
G S Haas ◽  
E Trautman ◽  
J Titus ◽  
G Geffin ◽  
...  
Keyword(s):  
Left Ventricle ◽  
Time Dependence ◽  
Oxygen Cost ◽  
Force Development

Cardiovascular Responses to Progressive Cycle Exercise in Healthy Children and Adults

2002 ◽  
Vol 23 (4) ◽  
pp. 242-246 ◽  
Author(s):  
A. Vinet ◽  
S. Nottin ◽  
A. M. Lecoq ◽  
P. Obert
Keyword(s):  
Cardiovascular Responses ◽  
Healthy Children ◽  
Cycle Exercise

Active recovery attenuates the fall in sweat rate but not cutaneous vascular conductance after supine exercise

2004 ◽  
Vol 96 (2) ◽  
pp. 668-673 ◽  
Author(s):  
Thad E. Wilson ◽  
Robert Carter ◽  
Michael J. Cutler ◽  
Jian Cui ◽  
Michael L. Smith ◽  
...  
Keyword(s):  
Heart Rate ◽  
Central Venous Pressure ◽  
Sweat Rate ◽  
Venous Pressure ◽  
Thoracic Impedance ◽  
Active Recovery ◽  
Central Venous ◽  
Cycle Exercise ◽  
Vascular Conductance ◽  
Cutaneous Vascular Conductance

The purpose of this study was to identify whether baroreceptor unloading was responsible for less efficient heat loss responses (i.e., skin blood flow and sweat rate) previously reported during inactive compared with active recovery after upright cycle exercise (Carter R III, Wilson TE, Watenpaugh DE, Smith ML, and Crandall CG. J Appl Physiol 93: 1918-1929, 2002). Eight healthy adults performed two 15-min bouts of supine cycle exercise followed by inactive or active (no-load pedaling) supine recovery. Core temperature (Tcore), mean skin temperature (Tsk), heart rate, mean arterial blood pressure (MAP), thoracic impedance, central venous pressure ( n = 4), cutaneous vascular conductance (CVC; laser-Doppler flux/MAP expressed as percentage of maximal vasodilation), and sweat rate were measured throughout exercise and during 5 min of recovery. Exercise bouts were similar in power output, heart rate, Tcore, and Tsk. Baroreceptor loading and thermal status were similar during trials because MAP (90 ± 4, 88 ± 4 mmHg), thoracic impedance (29 ± 1, 28 ± 2 Ω), central venous pressure (5 ± 1, 4 ± 1 mmHg), Tcore (37.5 ± 0.1, 37.5 ± 0.1°C), and Tsk (34.1 ± 0.3, 34.2 ± 0.2°C) were not significantly different at 3 min of recovery between active and inactive recoveries, respectively; all P > 0.05. At 3 min of recovery, chest CVC was not significantly different between active (25 ± 6% of maximum) and inactive (28 ± 6% of maximum; P > 0.05) recovery. In contrast, at this time point, chest sweat rate was higher during active (0.45 ± 0.16 mg·cm-2·min-1) compared with inactive (0.34 ± 0.19 mg·cm-2·min-1; P < 0.05) recovery. After exercise CVC and sweat rate are differentially controlled, with CVC being primarily influenced by baroreceptor loading status while sweat rate is influenced by other factors.

The influence of vigorous aerobic exercise on serum brain-derived neurotrophic factor and estradiol in young, healthy women as a function of the menstrual cycle

2021 ◽  
Author(s):  
Sarah Ahmad ◽  
Rodney Hansen ◽  
Matthew Schmolesky
Keyword(s):  
Menstrual Cycle ◽  
Aerobic Exercise ◽  
Neurotrophic Factor ◽  
Brain Derived Neurotrophic Factor ◽  
Cycle Exercise ◽  
Acute Bout ◽  
Healthy Women ◽  
Exercise Induced ◽  
Induced Changes ◽  
Serum Bdnf

AbstractResearch suggests strong inter-relationships between physical exercise, levels of brain-derived neurotrophic factor (BDNF), levels of estrogen, and the menstrual cycle, and yet no single study has examined these factors collectively in humans. The current study assessed the effect of an acute bout of vigorous aerobic exercise (20 minutes of stationary cycling at 80% of heart rate reserve) on serum BDNF and estradiol in healthy, eumenorrheic women, ages 18-28. In addition, this study determined whether basal BDNF or the exercise-induced increase in BDNF varies throughout the menstrual cycle. Thirty-four subjects were assigned to an experimental (n = 27) or control condition (n = 7). Exercise transiently increased both estradiol (51.2%) and BDNF (23.6%), and basal levels of BDNF and estradiol predicted the magnitude of the exercise-induced increases. Basal BDNF did not vary significantly throughout the menstrual cycle. Exercise-induced changes in BDNF did not correlate with menstrual cycle day or basal estradiol. Basal estradiol and basal BDNF showed a marginally significant positive correlation. Taken together, these results indicate that brief, vigorous aerobic exercise is sufficient to elevate both BDNF and estradiol in healthy women and that the menstrual cycle dramatically influences the magnitude of exercise-induced changes in estradiol, but not BDNF

Which method should be chosen to estimate the oxygen cost of walking in post-stroke individuals?

2021 ◽  
Author(s):  
Maxence Compagnat M ◽  
Stéphane Mandigout ◽  
Anaick Perrochon ◽  
Jean Yves Salle ◽  
Jean Christophe Daviet
Keyword(s):  
Oxygen Cost ◽  
Post Stroke
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