User guide
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This guide walks you through the setup process, key features, and best practices for the ActivForce 2 device and accompanying mobile app & web dashboard.
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About This Manual
This User Guide provides instructions for the safe and effective use of the ActivForce 2 device, the ActivForce mobile application, and the ActivForce web dashboard. It is intended to help you set up the system, perform strength and range of motion measurements, interpret test results, and maintain the device and its accessories.
Warnings, Cautions and Notes
Always use this manual in conjunction with any applicable local regulations, institutional policies, and professional guidelines. If anything in this manual is unclear or if you have questions about the use of the ActivForce system, contact ActivBody customer support before proceeding.
W000
Warnings indicate a risk of injury.
C000
Cautions indicate a risk of damage to the system, a risk of damage to the equipment or a risk of incorrect measurements.
N000
A note provides extra information.
Intended Use
The ActivForce 2 system is intended to measure and document isometric muscle strength and joint range of motion to support the assessment of neuromuscular function. It is a measurement tool that provides objective data to aid in the evaluation of medical conditions, but does not provide a standalone automated diagnosis.
Indications for Use
The device is indicated for use in clinical, rehabilitation, and sports medicine settings. It aids trained professionals in establishing baselines, monitoring neuromuscular function, and evaluating patient response to therapeutic interventions.
Intended Users
The ActivForce 2 system is intended to be used by trained adults such as licensed healthcare professionals (e.g., physical therapists, physicians, chiropractors), rehabilitation and sports medicine clinicians, and other qualified personnel who are experienced in musculoskeletal assessment and have received instruction in the proper use of the device and app.
C001
The instructions in this manual are solely intended for the mentioned users.
Contact and Fixation Accessories
W001
Do not use any contact or fixation accessory (Rounded Pad, Arched Pad, Hand Strap, Leg Strap, Immobilization Belt, Comfort Pack, Belt, Belt Loop Plate, Silicone Cover, Foam Insert) on body areas with:
- Open wounds, ulcers, or surgical incisions at the intended contact site
- Fragile, severely compromised, or very thin skin (e.g., severe eczema, steroid-thinned skin)
- Burns, active skin infections, or significant dermatological conditions at the contact site
- Skin that is damaged, irritated, or otherwise not healthy
W002
Do not use the device or accessories if the user and/or subject has a known allergy to silicone or plastic materials.
W003
Do not use the device or accessories if you observe any allergic reaction when in contact with the patient.
Body Regions and Underlying Conditions
W004
Do not use pads, straps, or belts on body regions where:
- Isometric muscle testing or resisted exercise is contraindicated (e.g., acute fracture, unstable joint, immediately post-operative area)
- Localized compression may aggravate an underlying condition (e.g., severe edema, acute soft-tissue injury)
Use of Straps, Belts, and Belt-Based Configurations
W005
Do not apply Hand Strap, Leg Strap, Immobilization Belt, or Belt Loop Plate configurations on:
- Limbs with known or suspected deep vein thrombosis (DVT)
- Limbs or regions with severe arterial or venous insufficiency or other serious vascular disease
- Chest or abdomen of patients where circumferential compression may compromise breathing or organ function
(e.g., severe cardiopulmonary disease, significant hernias, recent thoracic/abdominal surgery)
Do not place the buckle of a strap or belt against
- Body regions
- Hard surfaces
Do not use straps or belts at tension levels that:
- Cause pain, burning, numbness, tingling, or unusual discomfort
- Produce visible discoloration, swelling, or other signs of impaired circulation
- Cannot be adequately monitored in patients who are unable to communicate pain or discomfort
Accessory Fit and Device Condition
W006
Do not use any accessory setup when:
- Safe joint angles, posture, and stabilization cannot be achieved or maintained
- The plate, pad, strap, belt, or device cannot be securely attached and checked before force application
- There is a risk of sudden release, slipping, or uncontrolled movement of the device or accessory
Do not use the ActivForce 2 device if:
- The device, attached pad, or device accessories are visibly damaged
- The attached pad is not securely locked into position
Environmental Conditions
W007
Do not use the device in environments with excessive heat, humidity, or pressure outside the specified operating conditions
Limited Warranty
ActivBody, Inc. (“ActivBody”) provides a limited warranty to the original purchaser that the ActivForce 2 device and supplied accessories will be free from material defects in materials and workmanship under normal use for one (1) year from the date of purchase, unless a different period is required by applicable law or stated in your purchase documentation.
ActivBody’s sole obligation, and your exclusive remedy under this warranty, is repair, replacement, or refund of the product (at ActivBody’s discretion) if a covered defect is confirmed.
This warranty does not cover normal wear and tear, consumables (including batteries), cosmetic damage, or damage caused by misuse, abuse, accident, unauthorized modification or repair, use with non-ActivBody accessories, or use not in accordance with this manual.
To the maximum extent permitted by law, this limited warranty is provided in place of all other express or implied warranties, including implied warranties of merchantability and fitness for a particular purpose, and ActivBody’s liability is limited to the amount paid for the product. Rights may vary depending on your jurisdiction.
ActivForce Kit Components
ActivForce 2 Device
ActivForce Mobile Application
ActivForce Dashboard
Rounded Pad
Arched Pad
Foam insert
Silicone Cover
Hand Strap
Leg Strap
Belt
Belt Loop Plate
Carrying Case
Connecting the Device to the Mobile Application
Step 1
Turn on the device by pressing and holding the device button until you see a blue LED flashing. A BLUE flashing light indicates that the ActivForce 2 device is available for a Bluetooth® connection to the companion mobile application.
Step 2
Bluetooth needs to be turned ON for the phone or tablet. If it is OFF, the app will remind you to turn it ON.
Step 3
In the ActivForce app, start a measurement or select “Device Connection” in the “My Profile” screen, which can be found by opening the sidebar menu. A list of available devices will be shown in the app under “Available Devices”. Tap on the device name that corresponds to your ActivForce 2 device.
Step 4
The app will display a “Connecting” message while the connection is being established.
Step 5
When the Bluetooth connection is successfully established, the device LED will flash green periodically. A GREEN flashing light indicates the ActivForce 2 device is connected to the companion mobile application.
Step 6
Close the connection pop-up by tapping either on the “Done” or “X” button.
Step 7
The app offers two main types of tests and associated reports:
a. Force Measurements: Strength tests with left, right and N/A side options that report measurements in pounds, kilograms, or Newtons.
b. Range of Motion Measurements: ROM tests with left, right and N/A side options to obtain angle measurements in 3D space.
c. “Test Settings” menu is available in the sidebar to set test parameters, such as separate test duration settings for Strength and ROM test, and force measurement units.
Step 8
Turn off the device by pressing and holding the button until you see a red LED blink.
A single RED flash indicates that the device has been turned off.
Multiple RED continuous flashing lights indicate a low battery charge level and that the battery needs replacement.
N001
Always start the app and pair the device through the in-app “Connect” dialog in the app. Pairing the device through your mobile device’s Settings screen without pairing in the app will result in an error. If a pairing error occurs: close the app, turn off Bluetooth in your device’s Settings, turn Bluetooth back on, and pair the device again through the app.
N002
On Android, additional permissions are required to connect an ActivForce device. Depending on the Android OS version, the app may request that the user allow the following permissions:
- Location and Location Accuracy (Android 10 and 11)
- Nearby Devices (Android 12 and newer)
Downloading the Application
You can download the ActivForce mobile application from the Apple App Store and Google Play Store.
Creating an Account
Selecting Default Settings
Signing In
Step 1
If you already have an ActivForce account, enter your email address and password to sign in. If you don’t remember your password, click on the “Forgot password?” link. The onboarding will be shown the first time you sign in to the app.
Home Screen
Test Configuration
Strength Measurements
Range of Motion Measurements
Test Summary
Test Repetitions
Side comparison
Test Settings
Step 1
The test settings can be accessed from the Home screen by opening the sidebar menu and selecting “Test Settings”.
Force units for Strength measurements can be set in Imperial (lb), Metric (kg), or Newton (N). Additionally, test durations for Strength and ROM tests can be set separately.
N010
The default test duration is 5 seconds, but any duration between 1 and 60 seconds can be selected.
Profile
Using the ActivForce Web Dashboard
Tracking Progress
Attaching a Pad to the Device
The locking mechanism is a circle with four wide gaps that securely hold attachments in place through a twist lock mechanism. To secure an attachment to the ActivForce 2 device:
Step 1
Align the attachment teeth with the locking mechanism gaps.
Step 2
Push the attachment teeth down into the gaps.
Step 3
Twist the attachment clockwise (towards the locked symbol) a full quarter turn.
Step 4
When locked, the attachment will remain in place.
Measuring Force
The ActivForce 2 device measures accurately when force is applied in a perpendicular direction to the large surface areas of the device or an attached pad. Application of the force should be in the center of the surface as much as possible. Direct all force into the device directly perpendicular through the device’s center point.
C007
- Do not apply force in a non-perpendicular direction to the device.
- Do not apply force at an angle or in a direction going across (parallel to) the device.
- Do not apply force on or near to the blue band of the device.
- Do not apply a force during the three-second calibration period before the application starts the force measurement.
- Do not move or shake the device during the force measurement.
Measuring Range of Motion
The ActivForce 2 device can also measure angular displacement for range of motion testing. While the device is calibrating, make sure that the device is being held still in the starting position.
C008
- Do not rotate the ActivForce 2 device in multiple axes during a measurement.
- Do not move the ActivForce 2 device in multiple planes of motion during a measurement.
- Do not rotate the device during the brief calibration period before the application starts the range of motion measurement.
App Security
Sign in and out of the app or use the security features on your mobile device to ensure data privacy. Your data within the app is encrypted and accessible only with your username and password.
C009
Do NOT share your username or password with others. Always comply with local regulations on data privacy.
The Hand & Leg Straps
The Hand Strap
When using the Hand Strap attachment, ensure the strap is securely fixed in position. The Hand Strap may be used to secure the device to the user for strength and range of motion tests.
The Leg Strap
When using the Leg Strap attachment, ensure the strap is securely fixed in position. Use the Leg Strap to attach the device to the subject’s larger body parts for range of motion tests.
Threading the Hand and Leg Strap
Thread the strap through both loops with the logo face up and the plate face down. Place the device so that the locking mechanism fits into the hole in the plate. Slide your hand between the device and the strap. Pull the non-logo side across your hand. Pull the logo side over and secure the velcro. Use with desired attachment.
The Different Pads
The Immobilization Belt & Belt Loop Plate
When using the Belt Loop Plate immobilization belt attachments, keep the belt positioned perpendicular through the loops to reduce strain on the belt loops.
The Round Pad with the Belt Loop Plate is recommended when the device is being pressed into the inanimate object. The Belt Loop Plate may be used to guide the belt when the device is strapped to a fixed or immobile object.
W009
The plate is designed to hold the belt in position during a test and it is not designed to withstand force from a test. No force should be applied on the loops for a more accurate measurement. Keep the straps parallel to the direction of applied force so the force is transmitted to the device.
W010
Ensure the belt is wrapped over the smooth side of the device and not over the attachment side of the device.
Cleaning and Disinfecting the Device
The ActivForce 2 device’s external surfaces, including the rounded pad and the soft, arched pad silicon sleeve, can be hand wiped at room temperature with a soft cloth and a cleaning solution consisting of 70% isopropyl alcohol and water. After application, the cleaning solution should be allowed to evaporate completely.
Alternatively, a cleaning solution of 1% hypochlorite and water (10,000 ppm) can also be used to wipe the device, pads and silicon sleeves. Antibacterial hand sanitizing agents such as non-alcohol wipes or alcohol-based hand gels may also be used.
W011
To prevent the spread of infection and diseases, the ActivForce 2 device and pads should be disinfected between each use.
C010
Any residue from these agents should be wiped away using a soft, dry clean tissue or towel.
Replacing the Battery
The ActivForce 2 device comes with a standard AAA battery, which lasts between six to twelve months, depending on usage and environmental conditions. To replace the battery, follow these steps:
Troubleshooting
If the ActivForce 2 device does not connect with the mobile companion application, ensure that the application has Bluetooth permissions on the mobile device. For some devices, the ActivForce companion application also requires Location permissions. If connectivity problems continue to occur, follow the instructions to replace the battery or make sure your mobile device is supported.
The ActivForce mobile application performs a tare operation automatically before each measurement, during the calibration phase. In addition, the device can also be manually tared. To tare the device, select “Calibrate your device” from the profile menu of the ActivForce mobile companion application.
To perform a hard reset of the device, remove the battery and re-insert it after 10 seconds. The battery and the removable pads are the only user-serviceable items.
For further assistance, complaints or comments, please contact support@activbody.com.
Safety
The ActivForce 2 device is certified to be compliant with all required safety standards and regulations, including electromagnetic compatibility and hazardous materials, for all territories it is distributed in. This includes these standards: IEC 60601-1 (Safety) and EN 60601-1-2 (EMC).
C011
The ActivForce 2 device is not waterproof and should not be immersed in water or other liquids.
W013
Similar to many electronic devices, the ActivForce 2 device contains flammable materials and should not be exposed to flames or other excessive heat sources.
Service Life
The ActivForce 2 device has a service life of at least 30,000 cycles, or force measurements.
Disposal
The WEEE symbol indicates that the product should not be disposed of with other household waste. Batteries should be discarded separately, and the device should be deposited at an appropriate facility to enable recycling. Please separate these items from other types of waste and recycle them responsibly.
W014
Dispose of the device and accessories after cleaning and disinfection, according to local regulations.
Device Dimensions
Weight
(with AAA battery) 4.8 oz / 137 g
Length
3.7 in / 9.5 cm
Width
3.1 in / 7.8 cm
Height
1.3 in / 3.3 cm
Volume
(approximate) 8.5 in³ / 139 cm³
Device Functional Specifications
Force Measurement Range
0 to 200 lb / 0 to 90 kg
Force Measurement Accuracy
± (1.4 lb / 0.64 kg + 5% of the applied force)
Range of Motion
0 - 360º
Range of Motion Accuracy
±1° for angles measured from 0° to 33°, ±3% of the measured angle when > 33
Companion App OS Requirements
Android 10 or higher, iOS 17 or higher
Connectivity
Bluetooth 4.1
Operating Distance
Up to 7 ft / 2 m from mobile device
Battery
1 AAA battery
Battery Life
Approximately 6 months, may vary with usage or environmental factors
Operating Temperature
Range 32° to 95° F / 0° to 35° C
Storage Temperature Range
-13° to 122° F / -25° to 50° C
Operating Humidity Range
15% to 93% relative humidity
Case Dimensions
Weight
29.5 oz / 835 g
Length
14.2 in / 36.0 cm
Width
6 in / 15.2 cm
Height
3.94 in / 10.0 cm
Volume
(approximate) 334 in³ / 5,472 cm³
Accessories Dimensions
Hand Strap Length
13.5 in / 34.3 cm
Hand Strap Width
1.5 in / 3.8 cm
Leg Strap Length
31.5 in / 80.0 cm
Leg Strap Width
1.5 in / 3.8 cm
Belt Length
97.6 in / 247.9 cm
Belt Width
1.5 in / 3.81 cm
Electromagnetic Emissions
Emissions Test
Compliance
Electromagnetic Environment - Guidance
RF Emissions
CISPR 11
Group 1
The Activforce 2 uses RF energy only for its internal function. Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment.
RF Emissions
CISPR 11
Class B
The Activforce 2 is suitable for use in all establishments, including domestic establishments and those directly connected to the public low-voltage power supply network that supplies buildings used for domestic purposes.
N011
The following immunity tests are not applicable and were not performed because the device is internally powered (battery-operated) and has no external cables: Electrical Fast Transient/Burst, Surge, Conducted RF, Voltage Dips/Interruptions, and Electrical Transient Conduction (ISO 7637-2).
Electromagnetic Immunity
Immunity Test
IEC 60601-1-2 Test Level
Compliance Level
Electrostatic Discharge (ESD)
± 8 kV contact
± 8 kV contact
EN-IEC 61000-4-2(2008)
± 2 kV, ± 4 kV, ± 8 kV, ± 15 kV air
± 15 kV air
Radiated RFEM Fields
10 V/m
10 V/m
EN-IEC 61000-4-3(2006)+A1(2008)+A2(2010)
80 MHz - 2.7 GHz
10 V/m
Symbols Glossary
Symbol
Description
Reference
ActivBody Logo
ActivForce Logo
Bluetooth Logo
Date of Manufacture
ISO 7000-2497
Legal Manufacturer
ISO 7000-3082
Consult Instructions for use (eIFU)
ISO 7000-1641
Consult Instructions for use (IFU)
ISO 7010:M002
Type BF Applied Part
IEC 60417-5333
DC Current
IEC 60417-5031
Humidity Limitation
ISO 7000-2620
Temperature Limits
ISO 7000-0632
MR Unsafe
ASTM F2503
Keep Dry
ISO 7000-0626
WEEE Symbol
Medical Device
ISO 15223-1:2021 Ref. No. 5.7.7
Model Number
ISO 7000-2493
Catalogue Number
ISO 7000-2493
Serial Number
ISO 7000-2498
Unique Device Identifier
ISO 15223-1 Ref. No. 5.7.10
Disclaimer
This information is provided for general informational purposes only and is not intended as, nor should it be considered a substitute for, professional medical advice. Do not use the information on this website for diagnosing or treating any medical or health condition. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider. The information on this document is provided “as is” without any representations or warranties, express or implied.
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