Once your payment has been received, your Eforto® Device is prepared for packaging and shipment.

You’ll receive an email notification once your shipment is registered, containing the estimated delivery date and UPS tracking code so you can follow your package in real time.

Delivery time depends on your location:

- Within Europe or the US: typically a few business days.

- Outside Europe or the US: delivery may take longer due to customs procedures or required documentation (such as a certificate of origin).

For more help, contact us at: connect@eforto.com

Send a device linkage request with the following information to connect@eforto.com

• The serial number of the Eforto® Device

• The site to which you belong (i.e., the company/hospital) that bought the Eforto® Device.

Please find these guidance tips:

• Ensure the Eforto® Device is ON (blinking blue light).
  
• Verify it’s charged: The LED should be blue, not orange.
• Turn on Bluetooth on your smartphone.
• Confirm Bluetooth permissions setting are enabled for the Eforto app 
• Do not pair manually: connect the device only through the Eforto® App.

If it still doesn’t work, try another smartphone or tablet. If the issue continues, contact connect@eforto.com

Use a soft, dry, or moist cloth moistened with mild (neutral) detergent to clean your device, then wipe it with a dry cloth. For high-use environments, the Eforto® Device can easily be wiped with isopropanol, or we recommend Bacillol AF or Bacillol 30 wipes (30% alcohol).

⚠️ DO NOT wash or immerse your device or other components in water or other liquids. Clean with a dry cloth if wet.

⚠️ DO NOT use any abrasive or volatile cleaners.

⚠️ DO NOT use gasoline, thinners, or similar solvents to clean your device or other components.

No, you should not use any other charger. The Eforto® Device is designed for a specific voltage and current, and using an unapproved charger may damage the device or affect its performance. Always use the original charger provided with your Eforto® Device to ensure safe and proper charging.

Yes! You can test the Eforto® Device with a 3-month trial period. During this time, you’ll have full access to the Eforto® App (Pro subscription) and the Eforto® Metrics platform.

The total cost of the 3-month trial is €200 (excluding VAT). If you subsequently purchase the Eforto® Device, you will receive this €200 back in the form of a discount on the purchase.

We recommend recalibrating your Eforto® Device once every year to maintain the highest level of accuracy and performance.

The calibration service costs €150 (excluding VAT).

Please note that this price does not include shipping costs—both the cost of sending your device to our office in Meise, Belgium, and the return shipping cost are at your expense.

No, the Eforto® App is only available on smartphones or tablets.

You can use the Eforto® app on a smartphone or tablet. The smartphone/tablet should have Android version 9.0 or newer, or iOS 15 or newer. 

It is recommended that each healthcare professional maintain an individual account on the application. This allows accurate tracking of who performed each assessment, ensuring accountability and consistency in test administration.

Additionally, sharing accounts or passwords is not advised for data security and privacy reasons.

- For Regular App subscription (Eforto® App without data storage to the Eforto® Metrics platform), you should send an account creation request to connect@eforto.com. The request to create an account should include the following information:

• The serial number of the Eforto® Device.

• The site to which you belong (i.e., the company/hospital/etc.)

• The Gmail/Microsoft/Apple e-mail that you want to use for your account.

- For Pro App subscriptions (with data storage to the Eforto® Metrics platform), accounts are created by your project or site manager.

To support clinical deployment in multilingual settings, the Eforto® App is available in different languages: English, French, Dutch, German, Spanish, Italian, Polish, Finnish, Portuguese, Chinese, and Arabic.

If your Gmail or Microsoft account is a business account, your organization’s settings may block access to the Eforto app.

If your business e-mail doesn’t work, send an account update request to connect@eforto.com including:

• Eforto® Device serial number.

• Your site or organization (e.g. company/hospital)

• Current Gmail/Microsoft/Apple e-mail.

• New Gmail/Microsoft/Apple e-mail you wish to use.

If you don’t have another e-mail address, you can create one for free from here:

• Gmail: Create a Google Account

• Microsoft: Create a Microsoft Account

• Apple: Create an Apple Account

Note: A future update will allow the use of all email types, including business addresses.

• Your Eforto® license is valid for one year from the date of purchase or activation.

• When your license is close to expiring, we will send you a personalized renewal quote.

• If you choose not to renew, your access to the Eforto® App will end once the license expires.

The Eforto® Metrics platform can be accessed from any computer or laptop with an internet connection. It works with all modern web browsers, including Google Chrome, Microsoft Edge, Safari, and Mozilla Firefox. No software installation is required. 

While it can be opened on smartphone browsers, the smaller screen size may affect usability and viewing experience.

To support clinical deployment in multilingual settings, the Eforto® Metrics dashboard is available in different languages: English, French, Dutch, German, Spanish, Italian, Polish, Finnish, Portuguese, Chinese, and Arabic. 

If you already have a Regular App subscription, you can purchase the Eforto® Metrics license as an add-on.

To receive a personalized quote or more information, please contact us at connect@eforto.com.

• Your Eforto® license is valid for one year from the date of purchase or activation.

• When your license is close to expiring, we will send you a personalized renewal quote.

• If you choose not to renew, your access to the Eforto® App will end once the license expires.

Make sure you follow these guidelines when performing measurements. Failing to do so may lead to inaccurate results or cause the measurements to fail.
Please sit down and relax for 5 minutes before starting the measurements.

1. Sit upright with your back straight, your shoulders adducted, and your feet flat on the floor.

2. Bend your dominant arm at the elbow so the upper arm makes a straight angle (90 degrees) with the lower arm. Your forearm should be horizontal to the ground and unsupported as shown in the picture.

3. Close the fingers of your dominant hand around the bulb of the Eforto® Device so the thumb is on one side and the other fingers are on the opposite side.

4. Hold the Eforto® Device so that the wide end of the bulb is at the bottom and the enclosure is at the top.

5. Take the measurement in a calm and quiet area.

6. Stay still, and do not talk. Make sure to keep normal breathing while performing the measurements.

In some situations, this position will not be possible. In this case, a physician should advise you on the position you should adopt for your usage of the Eforto® Device.

Note: Grip strength measurements can be affected by the position of the Eforto® Device and your physiological and emotional condition.

To update the weight measurement unit, please contact us at connect@eforto.com and include 

Note: The selected unit will apply to all users and subjects at your site. If your site is part of a multi-site project, the same unit will be used across all sites in that project.

The questions at the beginning of the vitality capacity test are originating from the Multidimensional Fatigue Inventory (MFI-20). Only the questions for the physical fatigue domain are requested to be filled in. 

The answers to these questions are used to calculate the person’s self-perceived fatigue (physical fatigue) and vitality capacity (Capacity‑to‑Perceived Vitality ratio = CPV-ratio).

You can find more information about the MFI-20 here:
Smets, E.M.A., et al., 1995. The Multidimensional Fatigue Inventory (MFI) psychometric qualities of an instrument to assess fatigue. Journal of psychosomatic research, 39(3), pp.315-325. DOI: 10.1016/0022-3999(94)00125-o

Yes, the vitality capacity test is only one of the protocols that Eforto® offers. The “multi-fatigue test” protocol requires you to always fill in all 20 questions of the Multidimensional Fatigue Inventory (MFI-20) and calculate the corresponding scores.

You can request an update of your test protocol by sending an email to connect@eforto.com.The request to update the protocol should include the following information:

• The site to which you belong (i.e. the company/hospital/...etc. that bought the Eforto® Device)

• The protocol(s) that you want to use.

Note 1: The available protocol(s) is/are the same for all users and all subjects of the site.

Note 2: It is possible to have access to multiple protocols at the same time.

Note 3: If you are part of a project (with multiple sites), all sites of the project share the same protocol(s).

Yes, the vitality capacity test is only one of the protocols that Eforto® offers. The “Muscle capacity test” protocol does not contain any questions from the Multidimensional Fatigue Inventory (MFI-20). It only assesses grip strength and muscle fatigability.

You can request an update of your test protocol by sending an e-mail to connect@eforto.com. The request to update the protocol should include the following information:

• The site to which you belong (i.e., the company/hospital/... that bought the Eforto® Device)

• The protocol(s) that you want to use

Note 1: The available protocol(s) is/are the same for all users and all subjects of the site.

Note 2: It is possible to have access to multiple protocols at the same time.

Note 3: If you are part of a project (with multiple sites), all sites of the project share the same protocol(s).

Grip work is calculated as the area under the time-pressure curve during the muscle fatigability test. It reflects the total physiologic work produced by your handgrip muscles while maintaining force over time.

Two key factors influence your grip work value:

1. Duration of the muscle fatigability test: how long you can sustain at least 50% of your maximum strength.

2. Overall grip strength: your force level during the test.

A low grip work result usually means one of the following:

• You could only hold 50% of your maximum grip strength for a short period.

• Your overall grip strength is low.

You can learn more about test interpretation and ways to improve grip performance here: Muscle Fatigability

Results cutoff points are calculated based on biological sex and weight compared with standardized normative data.
These reference data are driven from research conducted with academic partners and validated cohorts with adjusted thresholds for muscle strength, muscle fatigability, and capacity-to-perceived vitality ratio (CPV ratio).

You can learn more about test interpretation and ways to improve grip performance here: 

Grip Strength

Muscle Fatigability

Vitality Capacity

Muscle fatigability can fluctuate throughout the day due to natural changes in muscle fatigue, hydration, motivation, or temperature.
Measurements are also affected by the way you hold the Eforto® Device and your measurement position. For consistent results, measure at the same time each day and under similar conditions. If you are under treatment or prescription of drugs, your handgrip strength and muscle fatigability readings may vary more.

The result may differ depending on which hand you use. It is recommended to perform the test with your dominant hand, as the color-coded feedback is based on normative data for the dominant hand. People generally do not have the same strength in their dominant and non-dominant hands, so using your non-dominant hand may lead to lower or inconsistent results.

No, hand size does not affect Eforto® test results. The Eforto® system is validated using bulb size 5, and all normative data are based on this standard size.

Research has shown that the Vigorimeter (used by Eforto®) is unaffected by hand geometry, meaning that measurements remain accurate regardless of hand size or shape. This makes the Eforto® Device a more reliable tool for assessing grip strength across diverse populations compared to traditional dynamometers, which can be influenced by anatomical differences.

Reference:
Lee et al., 2024. Reliability and Validity of the Martin Vigorimeter for Grip Strength Measurement in Korean Adults. Reliability & Validity Study. DOI: 10.4055/cios23383

Yes, you can view the grip strength of each attempt in the detailed results.

Simply tap the icon in the upper-right corner of the Results screen to open the detailed view of your test.

In the “Grip strength” section, you’ll find the values for each grip strength test.

Please note that grip strength 4 represents the maximum grip strength reached during the first five seconds of the muscle fatigability test.

Eforto® measures dynamic grip strength in units of pressure, specifically kilopascals (kPa), which represent force per unit area. While we do have a conversion factor to kilograms, the measurement dynamics of the Eforto® Device differ from those of hydraulic systems. The Eforto® App and Eforto® Metrics can automatically display estimated values in kilograms, which is useful at the population and cohort levels but less advisable for individual subjects, as the conversion is based on an estimation.

One of the causes of estimation error can be due to the fact that measurements with the traditional dynamometers are more influenced by the morphology of the hand compared to the bulb-based pneumatic Eforto® Device/Vigorimeter.

We have validated normative data for the Eforto® Device for grip strength with thresholds/cutoffs for sarcopenia, as well as for muscle fatigability and CPV ratio as an indicator of Vitality Capacity and early signs of Frailty.

The conversion formula to go from a result in kPa to a result in kg is as follows:

Estimation in kg = result in kPa * 0.43

By tapping on the Results screen on the icon in the upper right corner, you can view the details of your test. In the section “Grip strength”, you can view each individual grip strength and its conversion to kg.