Go Direct Hand Dynamometer can be used to measure grip and pinch strength and to perform muscle fatigue studies. This sensor connects directly to student devices via Bluetooth® wireless technology or USB. Students can correlate muscle strength and fatigue when they pair Go Direct Hand Dynamometer and Go Direct EKG.
Go Direct Hand Dynamometer can be used in a variety of experiments:
- Observe the effect of a conscious effort to overcome fatigue on hand grip strength.
- Correlate grip strength with arm circumference or height.
- Correlate measurements of grip strength and electrical activity with muscle fatigue.
- Evaluate grip strength and different limb positions.
Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.
Using the Product
Connect the sensor following the steps in the Getting Started section of this user manual.
- To assess grip strength, hold the sensor in a vertical position so that the fingers and palm of the hand make contact with the sensor pads. Squeeze the sensor so that force is applied to the pads.
- To assess pinch strength, hold the sensor in one hand by the case avoiding contact with the pads. Using your thumb and forefinger of the opposite hand, place each on the opposing pinch pads and squeeze.
- If the default experiment duration is too long for your experiment, change the data-collection parameters in the program you are using.
Go Direct Hand Dynamometer has seven measurement channels. The channel names are
- X-axis acceleration
- Y-axis acceleration
- Z-axis acceleration
- X-axis gyro
- Y-axis gyro
- Z-axis gyro
The default channel that is active when the sensor is connected is Force. The force channel measures force applied to the hand or finger grips along the body of the sensor.
There are three acceleration channels, measured by a single chip. An icon on the sensor shows the positive direction for each axis. Each direction of acceleration can be measured separately.
If you choose to activate all three acceleration channels at once, you can create a calculated column for the total acceleration magnitude.
Use the gyroscope channels to measure the rotation rate of the unit. If you choose to activate all three gyroscope channels at once, you can create a calculated column for the total magnitude of angular velocity.
Care and Maintenance
The Go Direct Hand Dynamometer contains a small lithium-ion battery. The system is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code: GDX-BAT-300).
Storage and Maintenance
To store the Go Direct Hand Dynamometer for extended periods of time, put the device in sleep mode by holding the button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.
Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.
Important: Go Direct Hand Dynamometer is not water resistant and should never be immersed in water.
If water gets into the device, immediately power the unit down (press and hold the power button for more than three seconds). Disconnect the sensor and charging cable, and remove the battery. Allow the device to dry thoroughly before attempting to use the device again. Do not attempt to dry using an external heat source.