The effect of exercise duration on the fast component of exercise hyperpnoea at work rates below the first ventilatory threshold

1996 ◽  
Vol 74 (6) ◽  
pp. 548-552 ◽  
Author(s):  
Michael Koehle ◽  
James Duffin
Keyword(s):  
Ventilatory Threshold ◽  
Exercise Duration ◽  
Fast Component ◽  
Exercise Hyperpnoea

Affect and Self-Efficacy Responses During Moderate-Intensity Exercise Among Low-Active Women: The Effect of Cognitive Appraisal

2010 ◽  
Vol 32 (2) ◽  
pp. 154-175 ◽  
Author(s):  
Amy S. Welch ◽  
Angie Hulley ◽  
Mark Beauchamp
Keyword(s):  
Self Efficacy ◽  
Acute Exercise ◽  
Cognitive Appraisal ◽  
Ventilatory Threshold ◽  
Rebound Effect ◽  
Exercise Program ◽  
Exercise Duration ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Ergometer Exercise

To investigate the relationship between cognitive and affective responses during acute exercise, 24 low-active females completed two 30-min bouts of cycle ergometer exercise at 90% of the ventilatory threshold. In one condition participants had full knowledge of the exercise duration (KD); in the other, exercise duration was unknown (UD). Affect and self-efficacy were measured before and every 3 min during exercise, and affect was also measured postexercise. Affect declined throughout the first half of both conditions, and continued its decline until the end of the UD condition, when a rebound effect was observed. Self-efficacy during exercise displayed a similar pattern. Hierarchical regression analyses demonstrated that during-exercise self-efficacy was a stronger predictor of during-exercise affect than preexercise self-efficacy, and that this relationship was strongest at the end of exercise when duration was unknown. These results indicate that repetitive cognitive appraisal of self and the task could impact the exercise experiences of low-active women during the adoption phase of an exercise program.

scholarly journals Effect of Exercise Duration on Subsequent Appetite and Energy Intake in Obese Adolescent Girls

2018 ◽  
Vol 28 (6) ◽  
pp. 593-601 ◽  
Author(s):  
Julie Masurier ◽  
Marie-Eve Mathieu ◽  
Stephanie Nicole Fearnbach ◽  
Charlotte Cardenoux ◽  
Valérie Julian ◽  
...  
Keyword(s):  
Energy Intake ◽  
Adolescent Girls ◽  
Ventilatory Threshold ◽  
Exercise Duration ◽  
Relative Energy ◽  
Obese Adolescent ◽  
Absolute Energy ◽  
Primary Focus ◽  
Analogue Scales

There is a growing interest regarding the effect of exercise on appetite and energy intake in youth. While the role of exercise intensity has been a primary focus of study, the effect of exercise duration on subsequent food intake has not been fully examined in obese adolescents. On three separate mornings in a randomly assigned order, obese adolescent girls (n = 20) aged 12–15 years old were asked to perform a rest session (control, CON) or two cycling sessions for 20 (EX20) or 40 min (EX40) set at their ventilatory threshold. Absolute and relative energy intake were measured from an ad libitum lunch meal 30 min after rest or exercise and appetite feelings assessed using visual analogue scales throughout the day. Hunger, satiety, and prospective food consumption were not significantly different between conditions. Absolute energy intake (kcal) did not differ between conditions, while relative energy intake on EX40 (571 ± 381 kcal) was significantly lower than during CON (702 ± 320 kcal; p < .05) and EX20 (736 ± 457 kcal; p < .05). Fat ingestion (in grams) was significantly lower on CON (7.8 ± 3.2 g) compared with EX20 (10.3 ± 4.6 g; p < .01). Protein intake (in grams) was higher on EX20 (37.0 ± 16.6 g) compared with both CON (29.5 ± 11.7 g; p < .01) and EX40 (33.1 ± 10.9 g; p < .05). However, the percentage of total energy derived from each macronutrient was not different between conditions. Obese adolescent girls do not compensate for an acute bout of exercise set at their ventilatory threshold by increasing energy intake, regardless of the exercise duration.

Cardiovascular and Oxygen Uptake Kinetics During Sequential Heavy Cycling Exercises

2003 ◽  
Vol 28 (2) ◽  
pp. 283-298 ◽  
Author(s):  
Stéphane Perrey ◽  
Jodie Scott ◽  
Laurent Mourot ◽  
Jean-Denis Rouillon
Keyword(s):  
Cardiac Output ◽  
Oxygen Uptake ◽  
Time Constant ◽  
Impedance Cardiography ◽  
Ventilatory Threshold ◽  
Slow Component ◽  
Oxygen Uptake Kinetics ◽  
Cycle Ergometer ◽  
Fast Component ◽  
Heavy Exercise

The purpose of the present study was to assess the relationship between the rapidity of increased oxygen uptake [Formula: see text] and increased cardiac output (CO) during heavy exercise. Six subjects performed repeated bouts on a cycle ergometer above the ventilatory threshold (∼80% of peak [Formula: see text]) separated by 10-min recovery cycling at 35% peak [Formula: see text]. [Formula: see text] was determined breath-by-breath and CO was determined continuously by impedance cardiography. CO and [Formula: see text] values were significantly higher during the 2-min period preceding the second bout. The overall responses for [Formula: see text] and CO were significantly related and were faster during the second bout. Prior heavy exercise resulted in a significant increase in the amplitude of the fast component of [Formula: see text] with no change in the time constant and a decrease in the slow component. Under these circumstances, the amplitude of the fast component was more sensitive to prior heavy exercise than was the associated time constant. Key words: impedance cardiography, exercise transitions, cardiac output, prior exercise

Validity of the Oxygen Uptake Efficiency Slope in Children With Cystic Fibrosis and Mild-To-Moderate Airflow Obstruction

2012 ◽  
Vol 24 (1) ◽  
pp. 129-141 ◽  
Author(s):  
Bart C. Bongers ◽  
Erik H.J. Hulzebos ◽  
Bert G.M. Arets ◽  
Tim Takken
Keyword(s):  
Cystic Fibrosis ◽  
Oxygen Uptake ◽  
Exercise Capacity ◽  
Ventilatory Threshold ◽  
Airflow Obstruction ◽  
Exercise Duration ◽  
Uptake Efficiency ◽  
Cardiopulmonary Exercise ◽  
Cardiopulmonary Exercise Capacity ◽  
Oxygen Uptake Efficiency Slope

Purpose: The oxygen uptake efficiency slope (OUES) has been proposed as an ‘effort-independent’ measure of cardiopulmonary exercise capacity, which could be used as an alternative measurement for peak oxygen uptake (VO2peak) in populations unable or unwilling to perform maximal exercise. The aim of the current study was to investigate the validity of the OUES in children with cystic fibrosis (CF). Methods: Exercise data of 22 children with CF and mild to moderate airflow obstruction were analyzed and compared with exercise data of 22 healthy children. The OUES was calculated using data up to three different relative exercise intensities, namely 50%, 75%, and 100% of the total exercise duration, and normalized for body surface area (BSA). Results: Only the OUES/BSA using the first 50% of the total exercise duration was significantly different between the groups. OUES/BSA values determined at different exercise intensities differed significantly within patients with CF and correlated only moderately with VO2peak and the ventilatory threshold. Conclusion: The OUES is not a valid submaximal measure of cardiopulmonary exercise capacity in children with mild to moderate CF, due to its limited distinguishing properties, its nonlinearity throughout progressive exercise, and its moderate correlation with VO2peak and the ventilatory threshold.

Chronic But Not Acute Oral L-Arginine Supplementation Delays the Ventilatory Threshold During Exercise in Heart Failure Patients

2005 ◽  
Vol 30 (4) ◽  
pp. 419-432 ◽  
Author(s):  
Stéphane Doutreleau ◽  
Bertrand Mettauer ◽  
François Piquard ◽  
Adrien Schaefer ◽  
Evelyne Lonsdorfer ◽  
...  
Keyword(s):  
Heart Failure ◽  
Maximal Exercise ◽  
Ventilatory Threshold ◽  
Minute Ventilation ◽  
Lactate Concentration ◽  
Exercise Duration ◽  
Plasma Lactate ◽  
Heart Failure Patients ◽  
Exercise Induced ◽  
Arginine Supplementation

The purpose of this study was to determine, in heart failure patients (HF), whether acute or chronic L-arginine supplementation (LAS) might delay the ventilatory threshold (VT) and whether chronic LAS might reduce exercise-induced plasma lactate increase. HF patients undertook 4 cardiopulmonary bicycle exercises tests. The first 3 were maximal without (EX1), after acute (EX2), or chronic (EX3) oral LAS (6 gm twice a day for 6 weeks). The 4th test (EX4), performed after chronic LAS, was similar to the first in order to investigate the effect of chronic LAS on circulating lactate levels. Results showed that acute LAS failed to improve both submaximal and maximal exercise capacities. Similarly, maximal exercise capacity remained unmodified after chronic LAS. Nevertheless, chronic LAS delayed significantly the patients' ventilatory threshold. Thus exercise duration prior to VT increased (mean ± SEM) from 6.04 ± 0.9 to 7.7 ± 1.03 min (p = 0.04), resulting in a significant increase in oxygen uptake (1.05 ± 0.08 to 1.24 ± 0.12 L•min−1; p = 0.03), CO2 release (0.94 ± 0.10 to 1.2 ± 0.12 L•min−1; p = 0.018), minute ventilation (29.31 ± 2.8 to 34.5 ± 2.7 L; p = 0.009), and workload (60.7 ± 9.8 to 78.5 ± 10.2 watts; p = 0.034). Furthermore, chronic LAS significantly reduced the exercise-induced increase in postexercise plasma lactate concentration (−21 ± 7%). In conclusion, unlike acute supplementation, chronic LAS significantly delays the ventilatory threshold, and chronic LAS reduces circulating plasma lactate in HF patients. These data suggest that chronic LAS might improve the ability of HF patients to perform their daily-life activities. Key words: maximal exercise, heart device, vasodilator

Ventilatory threshold is related to walking tolerance in patients with intermittent claudication

VASA ◽  
2012 ◽  
Vol 41 (4) ◽  
pp. 275-281 ◽  
Author(s):  
da Rocha Chehuen ◽  
G. Cucato ◽  
P. dos Anjos Souza Barbosa ◽  
A. R. Costa ◽  
M. Ritti-Dias ◽  
...  
Keyword(s):  
Blood Flow ◽  
Oxygen Uptake ◽  
Intermittent Claudication ◽  
Lower Limb ◽  
Ventilatory Threshold ◽  
Reactive Hyperemia ◽  
Ankle Brachial Index ◽  
Metabolic Parameters ◽  
Walking Distance ◽  
The Relationship

Background: This study assessed the relationship between lower limb hemodynamics and metabolic parameters with walking tolerance in patients with intermittent claudication (IC). Patients and methods: Resting ankle-brachial index (ABI), baseline blood flow (BF), BF response to reactive hyperemia (BFRH), oxygen uptake (VO2), initial claudication distance (ICD) and total walking distance (TWD) were measured in 28 IC patients. Pearson and Spearman correlations were calculated. Results: ABI, baseline BF and BF response to RH did not correlate with ICD or TWD. VO2 at first ventilatory threshold and VO2peak were significantly and positively correlated with ICD (r = 0.41 and 0.54, respectively) and TWD (r = 0.65 and 0.71, respectively). Conclusions: VO2peak and VO2 at first ventilatory threshold, but not ABI, baseline BF and BFHR were associated with walking tolerance in IC patients. These results suggest that VO2 at first ventilatory threshold may be useful to evaluate walking tolerance and improvements in IC patients.

Using Mobile Health Intervention to Explore the Daily Physical Activity Patterns among University Students: Observational Study (Preprint)

2020 ◽  
Author(s):  
Shao-Wei Yeh ◽  
Chun-Yan Yuan ◽  
Yu-Feng Wu ◽  
Rui Shen
Keyword(s):  
Physical Activity ◽  
Physical Exercise ◽  
University Students ◽  
Mobile Health ◽  
Activity Patterns ◽  
Exercise Duration ◽  
School Intervention ◽  
Sedentary Behaviors ◽  
Exercise Participation ◽  
Daily Exercise

BACKGROUND Promoting physical activity for adolescence is a global challenge in public health. Physical inactivity and sedentary behaviors have been regarded to cause harmful chronic diseases to adolescent lifespan. However, high engagement in mobile technology for students may provide opportunities to help change adolescent unhealthy behaviors. Therefore, school sectors may play an important key role, such as implementing mobile health (mHealth) intervention to change students’ unhealthy behaviors and promote regular physical exercise behaviors, especially during the transition from adolescence to young adult. OBJECTIVE This study aimed to explore university students’ daily exercise patterns upon intervention of school-based mHealth project. METHODS Students’ physical exercise participation was recorded with students’ mobile application. With 4152 university freshmen (1476 males, 2676 females) and 335898 of their exercise records were analyzed (mean frequency of 38.2 ±16.10 in males, 45.1±10.81 in females) during the semester. RESULTS Under the school intervention project, students that exercised on Friday and Saturday was lower than that on other days, which indicated that the participation in exercise were more active on weekdays than on weekends. Among the participants who completed the requirement set by the school intervention project, both males and females used weekends to do exercise. On the other hand, overweight male university students participated in physical activity more than the requirement of the school intervention project and their exercise duration were found to be significantly higher than other participants. CONCLUSIONS Understanding a week of daily exercise patterns among youth upon the school mHealth Apps intervention can benefit in developing efficient and flexible projects to promote physical health and improve regular exercise participation in youth.

scholarly journals Ventilatory response during exercise among chronic Chagas cardiopathy patients

2006 ◽  
Vol 124 (5) ◽  
pp. 280-284 ◽  
Author(s):  
Fátima Palha de Oliveira ◽  
Roberto Coury Pedrosa
Keyword(s):  
Ventilatory Response ◽  
Exercise Duration ◽  
Peak Oxygen Uptake ◽  
Cycle Ergometer ◽  
Control Group ◽  
Gas Exchange Parameters ◽  
Peak Vo2 ◽  
Ventilatory Parameters ◽  
Patients With Heart Failure ◽  
Patient Groups

CONTEXT AND OBJECTIVE: The change in slope of the VE/VCO2 curve with time during exercise (VE/VCO2 slope) has been recommended as a parameter for analyzing the ventilatory response during exercise among patients with heart failure of different etiologies. The aim of this work was to evaluate the ventilatory response among patients with chronic Chagas cardiopathy. METHODS: Forty-eight patients, divided into four groups according to the Los Andes clinical/hemodynamic classification, were studied. They were also classified according to peak oxygen uptake (peak VO2) for a second analysis. The results from the patients were compared with results from a control group consisting of 21 healthy male volunteers (no Chagas disease). Exercise was performed on a cycle ergometer with loads increasing at the rate of 12.5 watts/min, and exercise duration was symptom-limited. Gas concentration and flow rate data were fed into a computer, which produced a real-time report on ventilatory and gas exchange parameters (breath-by-breath). The ventilatory parameters of VE/VCO2 slope and VE/VCO2 ratio computed at different times of the test were adopted. RESULTS: Although there were no significant differences in VE/VCO2 ratio and VE/VCO2 slope when patients were grouped using the Los Andes clinical/hemodynamic classification, these parameters varied significantly when peak VO2 was used to define patient groups. CONCLUSION: Our results indicate that progressive deterioration in ventilatory response among chronic Chagas cardiopathy patients during exercise is more evident when the functional capacity (peak VO2) is reduced, than when changes are related to the Los Andes classification.

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