How to Use Fit Cuffs

<strong><strong><strong>Considerations Before Attachment</strong> <strong>⬇</strong></strong></strong>

  • 1. Before using Fit Cuffs please consider any relevant safety concerns at this sub-page BFR & Safety Concerns.

  • 2a. We advise You to use individualized pressures (mmHg) by the “Calculate Pressure” module at

    2b. In clinical practice working with fragile individuals, it is advised to use the Bluetooth Device to set the pressure relative to Limb Occlusion Pressure (LOP/AOP).

    3a. In order to use the Calculate Pressure module you must measure the corresponding circumference of your upper arm or upper thigh and please remember to do the measurement in a relaxed resting state. Go to Fit Cuffs Training App at and use the “Calculate Pressure” module, to acquire a personalized pressure (mmHg) recommendation. We advise You to update the pressure (mmHg) as often as possible. The Calculate Pressure module is a convenient and valid alternative to set the pressures relative to (LOP/AOP) – See our page Web App Explained for additional information concerning the app.

  • 3b. For more information and guides concerning the Bluetooth Device (LOP), please see Limb Occlusion Pressure (LOP) by Bluetooth

<strong><strong><strong>General Instructions For Attachment & Deflation</strong> <strong>Of The Cuffs</strong></strong></strong> <strong><strong>⬇</strong></strong>

  • 1. Before attachment – Ensure that the cuff is completely empty – deflated. – Please remember to deflate the cuffs after every training session to attain a proper fit of the cuffs! Please mind, You must use the Fit Manometer (pressure gauge) to deflate the cuff by turning the valve counter-clockwise. ⇩

  • 2. Attachment – Slide the cuff through the nylon loop and make sure the metal female connector is facing downwards.
    For fast and convenient attachments, be aware of left and right version of your cuffs which is relevant for the Complete & Performance models. Please check the videos above to distinguish “left” & “right” versions. ⇩

  • 3. Tension of the cuff – Make sure to have a semi-snug attachment, so that 3-4 fingers can easily pass underneath the cuff.
    – loose-fitting cuffs will require higher pressure to restrict blood flow and may slide during exercise. A tight fitting cuff will inhibit muscle contractions and result in excessive pressure fluctuations during muscle contractions. ⇩

  • 4. Inflation – Close the valve on the Fit Manometer by turning it clockwise and attach the male connector to the female connector on the cuff. You will hear a distinct “click” when the Fit Manometer has been connected successfully. ⇩

  • 5. Pressure calibration – For a proper fit and to avoid pressure drop during exercise you should “calibrate” the pressure (mmHg) within the cuffs. This is done by contracting the corresponding muscles several times while the Fit Manometer (pressure gauge) is still attached – see the video above “Attachment – Inflation & Pressure Calibration”. The goal pressure should be measured in a complete resting state, by placing the weight on the opposite leg or resting the corresponding arm, respectively.
    “Please remember to Pressure Calibrate Before Training To Avoid Pressure Drop During Exercise!”

Velcro strap placement for cylindrical like thigh shape vs cone

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Remember to utilize the custom fit for the Leg Cuffs V3, as it can be slightly adjusted to the shape of the thigh

<strong><strong>Troubleshooting – Struggling With Decreasing Pressures (⇩ mmHg) During Exercise</strong></strong> <strong><strong>⬇</strong></strong>

  • If You’re struggling with pressure leak during exercise, please consider the various reasons for this issue and not an actual “air-leak”: ⇩

  • When initiating inflation of the cuff the vasculature and fluids underneath the cuff will be forced downstream. This effect will only exacerbate when contracting the corresponding muscles making the circumference of the limb smaller and thereby you will experience a drop in pressure. ⇩

  • The nylon material is semi-elastic and the initial slack of the velcro attachment will lengthen during the first muscle contractions. So, the overall circumference of the cuff will expand initially creating a pressure drop because of this small but significant elongation. ⇩

  • Sufficient “calibration” is simply imperative to attenuate pressure drop as described above. Contract the relevant muscles several times while the Fit Manometer (pressure gauge) is still attached and remember to repeat this procedure accordingly. It might take about 1-2 minutes to get the pressure stable before exercising. ⇩

  • Please also consider, that even though the calibration phase has been done accordingly, You might experience a pressure drop if the cuff moves during exercise. In most cases, this can be attenuated if You remember to completely deflate the cuffs before attachment to attain a proper fit. ⇩

  • We advise You to reassess the pressure during training immediately after the first training set or interval, if the initial pressure calibration has been implemented accordingly but pressure drops during exercise.

How much pressure (mmHg) ? The Pressure-Load Continuum in Blood Flow Restriction Training ⬇

The time and less-load benefit of doing BFR is relative to the amount of relative pressure, being that higher pressure 70-90% of Limb Occlusion Pressure (LOP) seems to be favorable when tolerated.

This is particularly relevant when using very low-load (<25% 1RM), as it there seems to be a threshold of at least 60% LOP when using very low load.

It seems that relative load and relative pressure exists on mutual effected continuum. When using moderate-loads (40-50% of 1RM) use less pressure (40-60% LOP). On the other hand, when utilizing very low-load (<25% of 1 RM) It is strongly recommended to use higher relative pressures (70-90% LOP).

The load-pressure continuum appears to be a very important consideration especially post-operation or in other occasions with prescribed load restrictions. Conversely, for BFR application in a gym setting without any strict load restriction, it is probably favorable to utilize less pressure (40-60% LOP) but higher relative load (30-50% 1 RM). This phenomenon is illustrated below.

Cerqueira et al. (2021) Repetition Failure Occurs Earlier During Low-Load Resistance Exercise With High But Not Low Blood Flow Restriction Pressures: A Systematic Review and Meta-analysis

Pignanelli et al (2019) Low-load resistance training to task failure with and without blood flow restriction- Muscular functional and structural adaptations

If you would like the PDF manual for Fit Cuffs® Training System please send this request at For different Training Protocols see How When & Why BFR & The Complete BFR Guide

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