Heart rate and vo2 linear relationship calculator

Calculate burned calories (Running) without heart rate - Physical Fitness Stack Exchange

heart rate and vo2 linear relationship calculator

Continuous HR and VO2 data were analyzed via linear regression to determine y -intercept and slope values for %HRR vs. %VO2R and %HRR. preferably need laboratory calibration for individual HR to VO2 equation () , who made a linear steady state HR-VO2 model for bicycle ergometer exercise. VO2max to respective predicted values in cycling (Military Fitness Test). The predicted tion that there is a linear relationship between heart rate and oxygen . procedure was used to calculate the mean difference of direct and predicted.

This calculation is consistent with previous studies. At this point, a vertical line was dropped down to the x-axis of the graph, which represents the estimated VO2max. Linear relationship between heart rate and work rate in the prediction of VO2 max Training protocol The patients attended a community or hospital-based supervised exercise training session once per week for up to 12 weeks and they were encouraged to take part in a home exercise programme or exercise DVD two to three times per week.

The supervised exercise training programme consisted of a minute warm-up, 24 minutes of circuit interval training — comprised of aerobic and low-intensity resistance exercises, and a minute cool-down.

Statistical analysis Table 1. Paired t-tests are conducted on each variable and no correction has been made for multiple hypothesis testing, as this was a retrospective service evaluation study design.

heart rate and vo2 linear relationship calculator

A subgroup analysis was carried out on each variable predicted VO2max, submaximal O2 pulse and HR on a 15 cm and 20 cm step height. However, it should be noted that due to small numbers, data were not analysed separately on patients achieving stage 5 on the CST or in those taking part on a 25 cm step height.

Out of the patients, patients were stratified as high multi-factorial risk mean risk score The patients attended Demographic variables can be seen in table 1. A subgroup analysis demonstrated that patients taking part in a 15 cm step height significantly increased their predicted VO2max from Overall changes in predicted VO2 max on a 15 cm and 20 cm step height Changes in predicted O2 pulse Overall, O2 pulse increased from On a 15 cm step height, O2 pulse significantly increased at EOP assessment from Table 2 demonstrates the overall changes in O2 pulse.

Maximum Heart Rate

In the subgroup analysis, HR on average decreased by —2. These trends were similar for a 20 cm step height with smaller reductions in HR at stage 1 —3. Discussion The aim of this study was to apply the O2 pulse ratio to determine if the improvement in exercise performance on the CST is related to a true physiology adaptation following the Westminster MyAction programme. The O2 pulse significantly increased from One of the main mechanisms that contributed towards both the improvement in predicted VO2max and O2 pulse in this study was related to the reduction in the submaximal HR response on each stage of the CST table 3.

heart rate and vo2 linear relationship calculator

A reduction in the submaximal HR is a classical physiological training adaptation and is suggestive of an adjustment in the autonomic balance between parasympathetic and sympathetic nervous activity, resulting in the proficiency of the myocardium to accomplish a similar cardiac output at a lower myocardial oxygen demand. Overall changes in heart rate response on each stage of the CST The magnitude of the reduction in the submaximal HR response appears to be dependent on the exercise training intensity and volume.

In the present study, patients attended a supervised exercise session once per week for up to 12 weeks and they were encouraged to participate in a home exercise programme two to three times per week. There were insufficient numbers to calculate a meaningful reduction in submaximal HR at stage 5. However, one patient who completed stage 5 on a 25 cm step height achieved a 24 bpm reduction in their submaximal HR response after completing the MyAction programme. The second limitation is that the data were collected from clinical practice with no control group and it needs to be verified in a randomised prospective study design.

The third limitation is related to O2 pulse, which is normally measured through direct gas analysis during maximal cardiopulmonary exercise testing. Such predictions in VO2 using metabolic calculations are open to considerable individual variability, especially in patients with known heart disease. Future research is needed to control for these variables and should also confirm what difference would be clinically meaningful to the patient.

Acknowledgement The authors would like to acknowledge the support of Paul Bassett, Imperial College London, for his help with the statistical analysis.

Conflict of interest None declared. Key messages This service analysis demonstrates that the Westminster MyAction cardiovascular prevention and rehabilitation programme favourably influenced predicted VO2max and submaximal O2 pulse An increase in predicted VO2 and submaximal O2 pulse appears to be driven by a reduction in the submaximal heart rate response across 4 stages of the Chester step test CST at three different step heights Patients following a week structured exercise programme consisting of a supervised exercise session and a home programme performed two to three times per week can expect to save up to seven heart beats on the CST, which could potentially reduce myocardial ischaemia and lower risk of arrhythmias during exercise References 1.

British Association for Cardiovascular Prevention and Rehabilitation. Association of Chartered Physiotherapists in Cardiac Rehabilitation. Standards for physical activity and exercise in the cardiac population. Effect of encouragement on walking test performance. Reproducibility and safety of the incremental shuttle walking test for cardiac rehabilitation. Int J Cardiol ; The 6-minute walk test in outpatient cardiac rehabilitation: For example, looking at the table below taken from the respiratory system handout you will see that the VO2max for the world class athletes averaged 5.

Note that the two groups are matched by body size. They probably averaged about 70 kg or so. This is important since VO2 max depends proportionately on the size of the individual.

The arterial oxygen content, of course, is proportional to the amount of hemoglobin in the blood. The arterial-venous O2 difference increases when the muscles are able to extract a larger fraction of the oxygen in the blood. This occurs when there are more mitochondria relative to the amount of blood passing through the muscles. Look down the chart and observe what one factor correlates best with the magnitude of the VO2max.

A recent clinical study with older patients found that VO2max is one of the best predictors of mortality, especially if cardiovascular disease is present. Now let's focus on the results from one subject Thursday, To the right are the VO2 measurements for this subject, who we will continue analyzing below. The red line is the same as in the graph above for all lab sections. Notice that the points follow a linear relationship at lower levels of work.

This, of course, is as expected, since proportionately more ventilation is required to deliver more oxygen to the alveoli. But above about watts there is a change, with ventilation increasing considerably more than expected based on the earlier relationship.

What’s the Relationship Between VO2max and Heart Rate?

As we discussed on the previous page, this is because the subject has passed the lactate threshold anaerobic thresholdin which lactic acid begins accumulating in the body.

This causes a disproportionate increase in breathing through stimulation of the peripheral chemoreceptor. Thus the exhausted subject's PaCO2 is actually lower than at the beginning of the exercise. Lab Only The R. If a person is burning pure carbohydrate the ratio will be 1. For fat alone the ratio is about 0. At rest, our subject had an R. This is just as expected in a resting person. Typically, we are burning about half carbohydrates and half fats when we are at rest and not exercising, although this depends on the individual.

Our subject was near the average for carbohydrates and fats. In one respect this subject was a little unusual in that he was not hyperventilating a little at rest. This is usually the case as the subject anticipates the upcoming exercise. With hyperventilation, the R. This is what we usually observe at rest as the subject is anticipating the exercise.

Then as the subject begans to exercise at lower rates, the R. But above the lactate threshold we expect the R. This is what we see above about watts. One kcal, of course, is equal to one dietary calorie, such as are used on food packages.

Another energy unit is the metabolic equivalent MET. This is useful, since it takes into account the size of the subject. One MET is defined to be 1. Clinical studies looking at the effects of exercise typically express levels of exercise in terms of METs. A person expends, for example, about 1. Other values are given in the table on the second page of the exercise. You are also asked to estimate your daily energy expenditure using the blank table on the last page.

For the latter, first select activities from the MET table on the second page that more or less cover what you did on your selected day. Then fill in the MET value for each activity. Next fill in how many hours you spent on each activity and then total up the kilocalories for the entire 24 hours. On the lab practical, a calculation question might begin with a partially completed table from the handout.