Association between the Ventilatory Treshold and the Break-point in the Heart Rate/Work Rate Relationship: Comparison with the Break-point in the Double Product/Work Rate

The heart rates (HRs) indicating the anaerobic threshold, which corresponds to a fixed blood lactate concentration of 4mmol/l (heart rate at the onset of blood lactate accumulation (HR-OBLA)); are predicted on the basis of the heart rate—work rate relationship during exercise performance. The predictor is a multi-layer perceptron (MLP). For training and testing, 225 male soccer players (mean age, 21.6±4.5 years) performed an incremental running test on a treadmill with 3-min runs and 30-s blood sampling sessions for lactate assessment. In addition to the treadmill test data, the ages, masses, heights, body mass indices, and playing positions of half of the subjects ( n=113) were used to train the MLP and the remaining 112 were used for external validation. The results showed that the HR values recorded in the last stages before exhaustion were strong predictors of HR-OBLA ( r=0.875; standard error of estimates, 4.17). Inclusion of other parameters did not improve the prediction rate. Although additional work is needed to generalize the method to training prescription, results suggest that a neural network is a promising non-invasive tool for accurately estimating the HR-OBLA from exercise test data.

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Change in heart rate at double product break point and validity of utilizing age-predicted heart rate at 50%VO2max due to improvement of cardiovascular fitness

Japanese Journal of Physical Fitness and Sports Medicine ◽

10.7600/jspfsm.61.319 ◽

2012 ◽

Vol 61 (3) ◽

pp. 319-326

Author(s):

Takeshi Matsubara ◽

Toru Maeda ◽

Yoshiyasu Higuchi ◽

Mami Yanagawa ◽

Yuko Higuchi ◽

...

Keyword(s):

Heart Rate ◽

Break Point ◽

Cardiovascular Fitness ◽

Double Product

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Acute carnosine and β-alanine supplementation increase the compensated part of the ventilation versus work rate relationship during a ramp incremental cycle test in physically active men

The Journal of Sports Medicine and Physical Fitness ◽

10.23736/s0022-4707.20.10887-9 ◽

2020 ◽

Vol 61 (1) ◽

Author(s):

Eloisa Limonta ◽

Pietro L. Invernizzi ◽

Susanna Rampichini ◽

Angela V. Bisconti ◽

Emiliano CÈ ◽

...

Keyword(s):

Work Rate ◽

Physically Active ◽

Rate Relationship

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Impact of exercise based cardiac rehabilitation program in patients with transcatheter aortic valve replacement

European Journal of Preventive Cardiology ◽

10.1093/eurjpc/zwab061.357 ◽

2021 ◽

Vol 28 (Supplement_1) ◽

Author(s):

LE Estrada Martinez ◽

JA Lara Vargas ◽

JA Pineda Juarez ◽

JD Morales Portano ◽

JB Gomez Alvarez ◽

...

Keyword(s):

Heart Rate ◽

Cardiac Rehabilitation ◽

Intervention Group ◽

Rehabilitation Program ◽

Control Group ◽

Cardiac Rehabilitation Program ◽

Double Product ◽

Oxygen Pulse ◽

Transcatheter Aortic Valve ◽

Cardiopulmonary Performance

Abstract Funding Acknowledgements Type of funding sources: None. Introduction Due to the increase in global prevalence of degenerative valve disease, aortic stenosis (AS) has played a preponderant role in the cardiovascular scenario, especially in patients undergoing transcatheter aortic valve replacement (TAVR). An alternative management for this patients are the cardiac rehabilitation programs (CRP); however, their effect has not been completely understood, both in exercise capacity and quality of life, but neither in the improvement of cardiopulmonary performance and other cardiovascular outcomes. Purpose: To evaluate the effect of the CRP on exercise tolerance and cardiopulmonary performance in patients with AS undergoing TAVR. Methods: A cohort study was conducted including 26 patients with AS undergoing TAVR and divided into an intervention group who performed a 4-week supervised training program in the Cardiac Rehabilitation Service and a control group to whom instructions and recommendations to performed unsupervised exercise at home were given. Demographic and clinical data (VO2Max, METS12, oxygen pulse, heart rate, double product, left ventricular ejection fraction, body mass index) were collected at baseline and after a 4-week follow-up. Results: 15 patients were included in the intervention group and 11 patients in the control group. There were no baseline significant differences between groups. After the intervention, significant differences were observed in the METS 12 final gain variable between the control and intervention group (4.55 vs 3.1 p = 0.01). Intergroup analysis showed significant differences (percentage changes) in the intervention group with an increase of METS12 (67.4%, p = 0.001), oxygen pulse (18.21%, p = 0.01), final METS (39.47% p = 0.001) and a decrease in VO2 recovery time (-12.5%, p = 0.05), in the ergometric performance index by heart rate (-38.17%, p = 0.001) and by double product (-38.1%, p = 0.001). Conclusions A 4-week cardiac rehabilitation program is effective to improve exercise tolerance and cardiopulmonary response in patients with AS undergoing TAVR; improvement was statistically significant in METS12, oxygen pulse, VO2 recovery time, METS-load and ergometric performance index for heart rate and double product. METS12 final gain was statistically significant in intervention group in comparison with the control group. Abstract Figure. Control vs Intervention Group (METS12)

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The slope of ST segment/heart rate relationship during exercise in the prediction of severity of coronary artery disease

European Heart Journal ◽

10.1093/oxfordjournals.eurheartj.a061331 ◽

1982 ◽

Vol 3 (5) ◽

pp. 449-458 ◽

Cited By ~ 14

Author(s):

M. KARDASH ◽

M. S. ELAMIN ◽

D. A. S. G. MARY ◽

W. WHITAKER ◽

D. R. SMITH ◽

...

Keyword(s):

Coronary Artery Disease ◽

Heart Rate ◽

Coronary Artery ◽

St Segment ◽

Rate Relationship ◽

Artery Disease

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Maximal Oxygen Uptake Validation in Children With Expiratory Flow Limitation

Pediatric Exercise Science ◽

10.1123/pes.25.1.84 ◽

2013 ◽

Vol 25 (1) ◽

pp. 84-100 ◽

Cited By ~ 8

Author(s):

Katherine E. Robben ◽

David C. Poole ◽

Craig A. Harms

Keyword(s):

Oxygen Uptake ◽

Maximal Oxygen Uptake ◽

Constant Load ◽

Work Rate ◽

Flow Limitation ◽

Expiratory Flow Limitation ◽

Test Protocol ◽

Wide Range ◽

Rate Relationship ◽

Expiratory Flow

A two-test protocol (incremental/ramp (IWT) + supramaximal constant-load (CWR)) to affirm max and obviate reliance on secondary criteria has only been validated in highly fit children. In girls (n = 15) and boys (n = 12) with a wide range of VO2max (17–47 ml/kg/min), we hypothesized that this procedure would evince a VO2-WR plateau and unambiguous VO2max even in the presence of expiratory flow limitation (EFL). A plateau in the VO2-work rate relationship occurred in 75% of subjects irrespective of EFL There was a range in RER at max exercise for girls (0.97–1.14; mean 1.06 ± 0.04) and boys (0.98−1.09; mean 1.03 ± 0.03) such that 3/15 girls and 2/12 boys did not achieve the criterion RER. Moreover, in girls with RER > 1.0 it would have been possible to achieve this criterion at 78% VO2max. Boys achieved 92% VO2max at RER = 1.0. This was true also for HRmax where 8/15 girls’ and 6/12 boys’ VO2max would have been rejected based on HRmax being < 90% of age-predicted HRmax. In those who achieved the HRmax criterion, it represented a VO2 of 86% (girls) and 87% (boys) VO2max. We conclude that this two-test protocol confirms VO2max in children across a threefold range of VO2max irrespective of EFL and circumvents reliance on secondary criteria.

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Aging and spectral characteristics of the nonharmonic component of 24-h heart rate variability

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1999.276.6.r1724 ◽

1999 ◽

Vol 276 (6) ◽

pp. R1724-R1731 ◽

Cited By ~ 9

Author(s):

Seiichiro Sakata ◽

Junichiro Hayano ◽

Seiji Mukai ◽

Akiyoshi Okada ◽

Takao Fujinami

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Power Law ◽

Daily Life ◽

Spectral Characteristics ◽

Normal Subjects ◽

Break Point ◽

Total Power ◽

Interindividual Difference ◽

Analysis Of Dynamics

To examine whether heart rate variability (HRV) during daily life shows power law behavior independently of age and interindividual difference in the total power, log-log scaled coarse-graining spectra of the nonharmonic component of 24-h HRV were studied in 62 healthy men (age 21–79 yr). The spectra declined with increasing frequency in all subjects, but they appeared as broken lines slightly bending downward, particularly in young subjects with a large total power. Regression of the spectrum by a broken line with a single break point revealed that the spectral exponent (β) was greater in the region below than above the break point (1.63 ± 0.23 vs. 0.96 ± 0.21, P < 0.001). The break point frequency increased with age ( r = 0.51, P < 0.001) and β correlated with age negatively below the break point ( r = 0.39) and positively above the break point ( r = 0.70). The contribution to interindividual difference in total power was greater from the differences in the power spectral density at frequencies closer to both ends of the frequency axis and minimal from that at −3.25 log(Hz), suggesting hingelike movement of the spectral shape at this frequency with the difference in total power. These characteristics of the 24-h HRV spectrum were simulated by an artificial signal generated by adding two noises with different β values. Given that the power law assumption is fundamental to the analysis of dynamics through the log-log scaled spectrum, our observations are substantial for physiological and clinical studies of the heartbeat dynamic during daily life and suggest that the nonharmonic component of HRV in normal subjects during daily life may include at least two 1/ f β fluctuations that differ in dynamics and age dependency.

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Oxygen uptake-heart rate relationship in élite wheelchair racers

European Journal of Applied Physiology ◽

10.1007/s004210100493 ◽

2001 ◽

Vol 86 (2) ◽

pp. 174-178 ◽

Cited By ~ 12

Author(s):

Keith Tolfrey ◽

Victoria Goosey-Tolfrey ◽

Ian Campbell

Keyword(s):

Heart Rate ◽

Oxygen Uptake ◽

Rate Relationship

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