Web App – Explained

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Update July 2020 – We have just launched the Aerobic Fitness module for Fit Cuffs Training

Via the Bike Tests you can assess VO2 Max, Fitness Level and Watt Max, which is commonly known as “indirect tests” of VO2 Max. The tests can be performed on any type of exercise bike. Subsequently, you can use the build-in slider to set the intensity relative to either Watts or Beats Per Minute (BPM) i.e. Heart Rate Reserve (HRR). The features consist of 4(3) different tests build into the same interface:

a. For at start you only need to paste in Age, then the app will estimate your Max Pulse and Resting Pulse. This information is sufficient to use the slider functionality to set the intensity relative to Heart Rate Reserve (HRR). For a more precise estimation of your HRR you can add your Max Pulse and Resting pulse.

b. The Submaximal “One-point-test”, that can be used to estimate your VO2 Max, Fitness Level and Watt Max. To use this feature, you need to find your “steady-state-pulse” at a corresponding Watt Load, i.e. Load 1 and Pulse 1. again, you can add your Resting Pulse and Max Pulse to obtain a better estimation of your actual Aerobic Fitness.

c. For further improved estimation of your Aerobic Fitness, you can perform the same test but using a higher Load and higher pulse i.e. Load 2 and Pulse 2, the so called “Two-point-Test.

d. But the Golden standard for “indirect tests” Aerobic Fitness is the Watt Max Bike Test. This is done by a similar progressive protocol, but this test is much harder as you must go all out and reach the point of absolute failure in order to get a valid test result. This test should probably not be used in at risk populations i.e. heart or respiratory conditions without approval from a physician. But as a rule of thumb for the general public, if you’re not used to do strenuous aerobic type of exercise, this should probably not be conducted without gradual exposure to near maximal intensity aerobic exercise.

This module can be relevant for anyone into aerobic fitness and performance training or for clinicians working in cardio and or respiratory rehab with or without BFR. The Bike Tests can be used to estimate or predict Aerobic Fitness, because of the near linear relationship of Watts and Working Pulse and secondly the strong correlation of VO2 Max and Watt Max, commonly known as “indirect tests” for VO2 Max. The App has a very high ability to detect any relevant change of Aerobic Fitness.

Check our Blood Flow Restriction Blog (July 09, 2020), for further explanation of the different tests with reference to  relevant research papers and other source.

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Aerobic Fitness Modules at Fit Cuffs Training App

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Above is the intensity at 60% relative to Heart Rate Reserve (HRR) as shown in Work Pulse by Beats Per Minute (BPM) & The test results after the Watt Max Bike Test, subsequently set at 70% intensity.

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Above is the results from a Submaximal Bike Test as an “One-Point-Test at 50% intensity & the results from a Submaximal Bike Test as the “Two-Point-Test” at 40% intensity.

 

April 2020 – The brand-new progressive web app Fit Cuffs Training Calculate Pressure & LOP modules

We have developed and updated the algorithm from the comprehensive science and data in the predictors of Limb Occlusion Pressure (LOP), for You to enjoy Effective, Save and Convenient BFR Training when choosing “Calculate Pressure”:

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The App can be assessed online and offline by downloading it to your phone

Check the video on how to register a user and how you can download the app for offline accessibility from your homescreen.

We do not recommend to use arbitrary pressures, neither do we recommend a default pressure, even though, 80 mmHg and 100 mmHg for the upper and lower body, respectively, would be applicable for about 90% of all people. Our goal pressure extracted from the algorithm is 40-70% LOP and 50-80% LOP, for the upper and lower body, respectively.

Currently, the “Fit Cuffs Training” algorithm can predict this goal pressure for >95% of all people.From the comprehensive data, it seems that limb circumference can explain about 50-70% of the variance in LOP. But the width of the cuff is actually the most important factor to consider, that is also why “Fit Cuffs Training” is only applicable for Fit Cuffs®. Thigh circumference is undoubtedly the biggest anthropometric predictor of LOP in the lower body but it also seems that other factors are of importance: From the large amount of data, it seems that both gender, age and body composition influence the percentage of blood flow that is restricted. That is why these predictors has also been included in the algorithm, along with training condition, as we find this of importance for Ratings of Perceived Exertion (RPE) for BFR Training.

When LOP is not assessible, we recommend you choose “Calculate Pressure”, as limb circumference, age, gender, body compositions, and training condition are accounted for when utilising this module to obtain an indiviual restriction pressure. Every time You tab-in LOP and calculate a corresponding pressure for either upper or lower body, You actually help us to improve the algorithm as we get more data.

“In addition, we have outlined models which indicate that restrictive cuff pressures should be largely based on thigh circumference and not on pressures previously used in the literature.” (Loenneke et al. 2012).
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Source:

  1. Tuncali et al. (2006) A New Method for Estimating Arterial Occlusion Pressure in Optimizing Pneumatic Tourniquet Inflation Pressure.
  2. Tuncali et al. (2018) Tourniquet pressure settings based on limb occlusion pressure determination or arterial occlusion pressure estimation in total knee arthroplasty.
  3. Loenneke et al. (2012) Effects of cuff width on arterial occlusion implications for blood flow restricted exercise.
  4. Loenneke et al. (2014) Blood flow restriction in the upper and lower limbs is predicted by limb circumference and systolic blood pressure.
  5. Brown et al. (2018) Factors affecting occlusion pressure and ischemic preconditioning.
  6. Hunt et al. (2016) The influence of participants characteristics on the relationship between cuff pressure.
  7. Jessee et al (2016) The Influence of Cuff Width, Sex, and Race on Arterial Occlusion Implications for Blood Flow Restriction Research.
  8. Jobbágy & Varga (2014) Digitális Tankönyvtár. Biomedical Instrumentation. Indirect blood pressure measurement methods.
  9. Karabulut (2011) The effects of different initial restrictive pressures used to reduce blood flow and thigh composition on tissue oxygenation of the quadriceps.
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