StepLab is quick and simple Gait measurement/analysis App. Attaching 10g small sensors enable you to get the gait measurement anywhere.
(UI looks Japanese in the video below, but the APP actually includes English UI as well.)
By the algorithm developed by Zero C Seven, the analysis data can be acquired as a PDF report and can be output as CSV data. It has become possible to visualize and quantify walking factors in free places such as hospitals and care facilities without burdening both subjects and operators.
Acquirable gait factors
■Get report in PDF
・Number of Steps ・Distance (m) ・Gait speed for each event (m/s) ・L-R Stride difference for each event (%) ・Swing Phase / Stance Phase / Double Step ratio (%) ・Gait Cycle (s) ・Cadence (step/min) ・Stride length (m) ・Step length (m) ・Max. Toe clearance (cm) ・Min. Toe clearance (cm) ・Heel rocker angle (deg) ・Forefoot rocker angle (deg)
■Get file with CSV
・Packet Counter ・Sample Time Fine ・Quaternion_W ・Quaternion_X ・Quaternion_Y ・Quaternion_Z ・Free Acceleration_X ・Free Acceleration_Y ・Free Acceleration_Z
■Get video with MP4
・Subject Database (Data management & sharing) ・Syncronized Video (by using iPad/iPhone camera) ・Up to 5 times event input can be used for Time Up to Go test ・Auto start/stop function (hands free measurement) ・BLE5.0 robust wireless communication IMU (Xsens DOT)
Smart Gait Analysis
StepLab is available with an annual subscription. StepLab App can be free downloadable from App Store. Please note that you need to purchase the license key from Zero C Seven.
※ Regarding data recording on StepLabs, Xsens DOT sensor is required. Japanse customers can purchase from Zero C Seven. ・DOT Sensor Set (incl. 5 x DOT sensor, 300 x double-side stickers) 150,000yen (165,000yen in tax). Overseas customers can purchase from Xsens, or Xsens's local dealer.
App operating environment
・iOS13 or later, Bluetooth4.2 (5.0 recommend) iPad or iPhone ・WiFi Internet connection, 2 x DOT sensors (v1.6.0 or later)
(UI looks Japanese in the video below, but the APP actually includes English UI as well.)
Where can I use it?
It can be used almost anywhere, such as hospital rehabilitation training rooms, corridors, and outdoors. Two sensors are attached to the foot and can be easily measured with an iPad or iPhone via Bluetooth communication. Since the sensor has the certification mark of the technical conformity inspection, there is no radio interference to other communication devices.
What is the maximum recording time?
There are no time limit. It can also be used to measure walking for 6 minutes or walking for 10 minutes. However, since the walking factors of distance and angle are calculated as average values, if you make a U-turn (do not rotate in the same direction) in a figure of 8 when reciprocating in a straight line direction, more accurate data will be obtained.
Can it be used for running?
The Xsens DOT sensor has a normal filter for gait measurement and a dynamic filter for running, but since this app is mainly designed to acquire gait factors, it is fixed to the filter mode for gait measurement. Therefore, it is not suitable for running measurement.
Can it be used on a treadmill?
The treadmill cannot be used because it cannot make a correct ground contact judgment because acceleration is applied even when the heel touches the ground and the toes take off.
Tell me the specifications of the sensor in detail.
The Xsens DOT sensor is a highly accurate 9DOF IMU. You can find the details at the link below. https://www.0c7.co.jp/products/sensing/xsens/product-lineup/xsens-dot.html
Is the version upgrade free?
You can use the latest version of StepLab that will be released within the expiration date of your 1-year subscription free of charge. [Caution] Past measurement data is saved in the app, so when installing the latest version, please download and install the current version without uninstalling it.
What should I do if the sensor fails?
Xsens DOT sensoe includes 1 year warranty. Please contact your local distributor for replacements.
Can I get the joint angle?
In StepLab, the sensor is not placed in the segment that sandwiches the joint, so the joint angle cannot be acquired.
Is it possible to measure with just one sensor?
Due to the specifications of the app, it does not support measurement with a single sensor. Be sure to place the two on the left and right feet (where the instep is stable).
Can I switch apps to another iPad or iPhone device?
Purchased licenses can only be activated for one device. Please contact our customer support when you wan to change the device. We will support deactivation / reactivation up to several times.
Can it be used on Android devices?
There are iOS and Android in the software development environment (SDK) of the Xsens DOT sensor used in StepLab, but it is unfortunate because we are developing only iOS from the viewpoint of optimizing application development and debug management. However, it is not compatible with Android. There are currently no plans to release the Android version.
Can it be used on a Windows PC?
For the above reasons, Windows is not supported because there is no development environment on Windows. There are currently no plans to release the Windows version.
Is it okay for the sensor to get wet?
Although the sensor is IP68 waterproof, please do not use for underwater gait measurements in pools, as Bluetooth communication is blocked underwater.
How long is the continuous use time and charging time?
Continuous use is 6 hours and charging time is 1 hour.
Is there any way to fix the sensor other than double-sided tape?
Yes, you can also fix it with a strap belt. Please contact us for details.
How do you calculate the stride length? How accurate is it?
The swing phase is determined from the acceleration, and the acceleration during the swing is integrated twice to calculate the distance. In the case of normal walking, there is an error of about ± 1 cm.
Is the toe height accurate?
The definition of the toe position is 1) the distance measured from the front tip of the sensor to the toe, and 2) the point that is reflected forward from the point orthogonal to the ground in the vertical direction from the sensor fixed position. However, since the toe part of the shoe is slightly warped, please consider that it is actually about 1cm higher than the acquired data. For barefoot gait measurements, toe height is more accurate.
How do you calculate your stride length?
After calculating the left and right stride lengths, the error of each stride length pair is judged and used as the stride length.
Is the average walking speed accurate?
It is calculated as the average walking speed excluding first two steps (1 stride) and last two steps (1 stride) of walking. The error is about 1% due to the accuracy of the stride length mentioned above.
What will happen to various data in abnormal gait (circumduction gait or dragging gait, etc.)?
Unfortunately, the above-mentioned data accuracy cannot be guaranteed because the error in determining the walking condition becomes large. In addition, it is difficult to answer a uniform accuracy error for various abnormal walking, but instead of focusing on detailed data in one walking cycle, we focus on the average value and features of one measurement data, and with past data. I hope you use it for the purpose of understanding the comparison of.
How accurate is the angle factor?
The angle factor was a 1 degree difference compared to the digital goniometer.
Does the angle factor drift?
The angular velocity meter is mainly used to acquire the angle, but since the accelerometer and earth magnetometer are processed onboard by Xsens's high-quality fusion algorithm, the static accuracy is 0.5 deg and the dynamic accuracy is 1.0deg. There is almost no drift.
What are the specific angles for step-off / heel contact?
Step-off angle = Forefoot locker (the moment the MP joint separates from the ground), Heel contact angle = Heel rocker. It is calculated by the installed algorithm.
How are the various walking factors calculated when the event is entered?
The number of steps and walking speed for one stride at the time of inputting an event are excluded from the calculation, but the walking distance between two event inputs is not excluded from the calculation. If the number of steps on one leg is less than 2, the message "Data cannot be analyzed" will be displayed, so please be careful not to input events continuously.
I can't attach a PDF report to an email, what should I do?
If you select PDF as an email attachment, it will be attached to Apple's Mail app. Please check if the settings for sending and receiving the Mail app are correct. In addition to email attachments, you can also share via SNS such as LINE or transfer to nearby Apple devices such as Mac by Air Drop sharing.
Is it possible to calculate the angle in the direction of the tip of the foot?
Unfortunately, it is not currently available.
Please tell me the best measurement method
Ideally, you should measure walking in a straight line. If you cannot secure a long distance due to space, you may make a U-turn and turn back. However, with the current specifications, please keep in mind that acceleration / deceleration of several steps during a U-turn also affects the calculation of the average walking speed, and use event input before and after the U-turn.
Oct. 18, 2021
StepLab for iPad / iPhone (ver1.1.2) released. Fixed some typos and a bug in screen display on some devices.
Sept. 19, 2021
StepLab for iPad / iPhone (ver1.1.1) released. It is now possible to switch subjects on the setup screen. The report analysis has been changed to a form that is performed after the measurement is completed, and if the analysis cannot be performed, a notification will be sent. This makes it possible to smoothly perform continuous measurement with different subjects.