Oxygen Consumption and Heart Rate Responses in Graded Exercise during Long-Duration Space Flight

2010 ◽  
Vol 42 ◽  
pp. 515
Author(s):  
Alan D. Moore ◽  
Stuart M.C. Lee ◽  
Frank A. McCleary ◽  
Simon N. Evetts ◽  
Alan H. Feiveson
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Space Flight ◽  
Long Duration ◽  
Graded Exercise

Validity of a Submaximal 1-Mile Track Jog Test in Predicting VO2max in Fit Teenagers

2000 ◽  
Vol 12 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Brian R. Hunt ◽  
James D. George ◽  
Pat R. Vehrs ◽  
A. Garth Fisher ◽  
Gilbert W. Fellingham
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Cross Validation ◽  
Maximal Oxygen Consumption ◽  
Prediction Equation ◽  
Open Circuit ◽  
Graded Exercise Test ◽  
Graded Exercise ◽  
Specific Prediction ◽  
Maximal Effort

The purpose of this study was to validate the ability of the 1-mile jog test to predict VO2max in fit teenagers. Forty-one males and 42 females performed the steady-state, submaximal jogging test on an indoor track, along with a maximal graded exercise test (GXT) on a treadmill. Open circuit calorimetry was used during the GXT to measure maximal oxygen consumption (VO2max). We generated the following age-specific prediction equation applicable to boys and girls 13–17 years old (n = 83, Radj = .88, SEE = 3.26 ml · kg−1 · min−1): VO2max = 92.91 + 6.50 × gender (0 = female, 1 = male) − 0.141 × body mass (kg) − 1.562 × jog time (min) − 0.125 × heart rate (bpm). Cross-validation results were acceptable (SEEpress = 3.44 ml · kg−1 · min−1). As a field test, the submaximal 1-mile jogging test may alleviate problems associated with pacing, motivation, discouragement, injury, and fatigue that are sometimes associated with maximal effort timed or distance run tests.

Cardiovascular response to graded exercise in the sympathectomized-vagotomized dog

1963 ◽  
Vol 204 (2) ◽  
pp. 291-296 ◽  
Author(s):  
Edmundo Ashkar ◽  
William F. Hamilton
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Cardiac Output ◽  
Oxygen Consumption ◽  
Mean Arterial Pressure ◽  
Stroke Volume ◽  
Cardiovascular Response ◽  
Peripheral Resistance ◽  
Graded Exercise ◽  
Oxygen Difference

Seven dogs who ran well on a motor-driven treadmill were completely sympathectomized (including adrenal denervation) and subjected to unilateral vagotomy below the recurrent laryngeal branch. After recovery and retraining, a terminal experiment was performed in which, after completing the vagotomy, direct Fick determinations of cardiac output and continuous recordings of mean arterial pressure, heart rate, and oxygen consumption were made at rest and during increasing exercise The results were compared with those described by Barger et al. ( Am. J. Physiol. 184: 613, 1956) for normal dogs running at smaller speeds and grades. The heart rate of the operated dogs increased from 117 to 134. Barger's normal dogs doubled their heart rate. The A-V oxygen difference increased with work slightly less than Barger's normal dogs but the scatter in both groups was wide, as was the case with the stroke volume. The resting cardiac output was nearly normal in the operated dogs but increased only 34% with exercise, as against 200–300% in Barger's normals. Oxygen consumption increased about twofold as against the expected normal of three- to sevenfold. Peripheral resistance in both groups went down about 40%. The blood pressure in the normal increased substantially while that in the operated dogs fell about 20% to an average of 60 mm Hg.

scholarly journals Validity of dynamical analysis to characterize heart rate and oxygen consumption during effort tests

2020 ◽  
Author(s):  
D. Mongin ◽  
C. Chabert ◽  
A. Uribe Caparros ◽  
A. Collado ◽  
E. Hermand ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Dynamical Analysis ◽  
Performance Indices ◽  
Graded Exercise Testing ◽  
Graded Exercise ◽  
Before And After ◽  
Effort Tests ◽  
Good Characterization

ABSTRACTPerformance is usually assessed by simple indices stemming from cardiac and respiratory data measured during graded exercise test. The goal of this study is to test the interest of using a dynamical analysis of these data. Therefore, two groups of 32 and 14 athletes from two different cohorts performed two different graded exercise testing before and after a period of training or deconditioning. Heart rate (HR) and oxygen consumption (VO2) were measured. The new dynamical indices were the value without effort, the characteristic time and the amplitude (gain) of the HR and VO2 response to the effort. The gain of HR was moderately to strongly associated with other performance indices, while the gain for VO2 increased with training and decreased with deconditioning with an effect size slightly higher than VO2 max. Dynamical analysis performed on the first 2/3 of the effort tests showed similar patterns than the analysis of the entire effort tests, which could be useful to assess individuals who cannot perform full effort tests. In conclusion, the dynamical analysis of HR and VO2 obtained during effort test, especially through the estimation of the gain, provides a good characterization of physical performance, robust to less stringent effort test conditions.

Analysis of Peak Oxygen Consumption and Heart Rate during Elliptical and Treadmill Exercise

2001 ◽  
Vol 10 (1) ◽  
pp. 48-56 ◽  
Author(s):  
John A. Mercer ◽  
Janet S. Dufek ◽  
Barry T. Bates
Keyword(s):  
College Students ◽  
Heart Rate ◽  
Oxygen Consumption ◽  
Exercise Test ◽  
Treadmill Exercise ◽  
Peak Oxygen Consumption ◽  
Physically Active ◽  
Graded Exercise Test ◽  
Type Design ◽  
Graded Exercise

Objective:To compare peak oxygen consumption (VO2) and heart rate (HR) during treadmill (TM) running and exercise on an elliptical trainer (ET).Design:A graded exercise test (GXT) during TM running and ET exercise.Participants:Physically active college students (N = 14; 25 ± 4.6 years). Each completed a TM GXT and ET GXT on separate days.Results:There were no differences in either VO2peak or peak HR between TM (53.0 ± 7.7 ml · kg–1 · min–1, 193.4 ± 9.4 bpm) and ET (51.6 ± 10.7 ml · kg–1 · min–1, 191.2 ± 11.5 bpm; P > .05). Correlations between HR and VO2 data for all stages of exercise for all subjects were similar between machines (ET: r = .88; TM: r = .95; P > .05).Conclusion:No adjustments to the target HR used during TM running are necessary when using the ET.

scholarly journals Physiological determinants of the increase in oxygen consumption during exercise in individuals with stroke

2019 ◽  
Author(s):  
Kazuaki Oyake ◽  
Yasuto Baba ◽  
Nao Ito ◽  
Yuki Suda ◽  
Jun Murayama ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Tidal Volume ◽  
Cardiorespiratory Fitness ◽  
Ventilatory Threshold ◽  
Peak Exercise ◽  
Cardiorespiratory Response ◽  
Graded Exercise ◽  
Response To Exercise ◽  
Oxygen Difference

AbstractBackgroundUnderstanding the physiological limitations of the increase in oxygen consumption (V̇O2) during exercise is essential to improve cardiorespiratory fitness in individuals with stroke. However, the physiological determinants of the increase in V̇O2 during exercise have not been examined using multivariate analysis in individuals with stroke. This study aimed to identify the physiological determinants of the increase in V̇O2 during a graded exercise in terms of the respiratory function, cardiac function, and ability of skeletal muscles to extract oxygen.MethodsEighteen individuals with stroke (60.1 ± 9.4 years of age, 67.1 ± 30.8 days poststroke) underwent a graded exercise test for the assessment of cardiorespiratory response to exercise. The increase in V̇O2 from rest to ventilatory threshold and that from rest to peak exercise were measured as a dependent variable. The increases in respiratory rate, tidal volume, heart rate, stroke volume, and arterial-venous oxygen difference from rest to ventilatory threshold and those from rest to peak exercise were measured as independent variables.ResultsFrom rest to ventilatory threshold, the increases in heart rate (β = 0.546) and arterial-venous oxygen difference (β = 0.398) were significant determinants of the increase in V̇O2 (adjusted R2 = 0.703, p < 0.001). From rest to peak exercise, the increases in tidal volume (β = 0.611) and heart rate (β = 0.353) were significant determinants of the increase in V̇O2 (adjusted R2 = 0.702, p < 0.001).ConclusionV̇O2 is well-known to increase nearly linearly with increasing heart rate; however, our results suggest that arterial-venous oxygen difference and tidal volume are also significant physiological determinants of the increase in V̇O2 from rest to ventilatory threshold and that from rest to peak exercise, respectively. Our findings could potentially contribute to the development of appropriate therapies to improve cardiorespiratory fitness in individuals with stroke.

CARDIORESPIRATORY SYSTEM UNDER BICYCLE ERGOMETER TEST IN SKIERS WITH DIFFERENT TRAINING STATUS (KOMI REPUBLIC)

2019 ◽  
pp. 76-84
Author(s):  
Yu.G. Solonin ◽  
T.P. Loginova ◽  
I.O. Garnov ◽  
A.L. Markov ◽  
A.A. Chernykh ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Komi Republic ◽  
Rate Pressure Product ◽  
Training Status ◽  
Maximum Oxygen Consumption ◽  
Bicycle Ergometry ◽  
Cardiorespiratory System ◽  
Unit Pulse ◽  
Ski Racers

The aim of the study is to examine the impact of training status on ski racers (Komi Republic) at rest and under bicycle ergometry evaluating their cardiorespiratory system parameters. Materials and Methods. The authors examined male ski racers with different training status: 22 first-rank sportsmen, 22 candidates for Master of Sports and 22 Masters of Sports. Athletes underwent bicycle ergometry loads up to refusal. Oxycon Pro system (Germany) was used. Then authors studied the complex of cardiorespiratory parameters, calculating maximum oxygen consumption and unit physiological cost. Results. At rest and under standard physical load (200 W) Masters of Sports demonstrate significantly increased training status among ski racers in such cardiorespiratory system parameters as heart rate, rate pressure product and oxygen pulse. Under standard physical load (200 W) statistically significant differences between first-rank sportsmen and candidates for Master of Sports are detected by heart rate, rate pressure product, respiration rate, respiratory minute volume and oxygen utilization coefficient. Such deviations indicate differences in training status. Under maximum load, the highest training status is found in Masters of Sports: bicycle ergometry load power and duration; unit pulse, pressor and cardiac cost, bulk and unit values of maximum oxygen consumption. Heart rate values, unit pulse and heart-vent cost indicate a high training status in candidates for Master of Sports under load up to refusal, if compared with first-rank sportsmen. Athletes’ organism under load up to refusal works more efficiently than under moderate load (200 W). The training status in ski racers (Komi Republic) is manifested in the saving cardiorespiratory system functions, both at rest and under standard bicycle ergometry, as well as in parameters of unit physiological cost under loads up to refusal and increased values of maximum oxygen consumption. Keywords: ski racers, Komi Republic, training status, bicycle ergometry loads, cardiorespiratory system, maximum oxygen consumption.

Prolonged Kinetics of Recovery of Oxygen Consumption After Maximal Graded Exercise in Patients With Chronic Heart Failure

Circulation ◽  
1995 ◽  
Vol 91 (12) ◽  
pp. 2924-2932 ◽  
Author(s):  
Alain Cohen-Solal ◽  
Thierry Laperche ◽  
Daniel Morvan ◽  
Michel Geneves ◽  
Bernard Caviezel ◽  
...  
Keyword(s):  
Heart Failure ◽  
Oxygen Consumption ◽  
Chronic Heart Failure ◽  
Graded Exercise ◽  
Kinetics Of
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