kMeter Manual: App Usage
An overview of the functions of the kMeter app.
Connect your iOS device by pushing the green connect button on the start screen (device needs bluetooth to be enabled and kMeter to be turned on). Choose Set up to change settings, results to see previously saved data in the built-in database. Press start to manually start data acquisition. To get screen on a TV connect your TV to a Apple TV and use screen sharing. The app landscape mode of the kMeter will be presented on the TV screen.
Connect: Connect to kMeter, see which kMeter you are connected to or disconnect. If multiple active kMeters within reach you will get a choice which one to connect to.
User: Select user or add new together with name, weight, height, birth date, gender, team and club. Weight in kgs or lbs is used to get relative peak power in set summary (peak power in W / kg or W / lbs) and BMI. You can set up a .csv file with all your users and shared it via email, iCloud or Google Drive. Open the file in your iOS unit and choose “Copy to Exxentric” to import the users. Download templates and instructions here. You can also delete users by selecting the specific user and press “delete”.
Inertia: Push the button to select the correct amount of wheels to pick the corresponding inertia. Inertia is also presented in numerical values in setup and on the flywheel in the centre of the screen. At the start screen, press the inertia value to go straight into inertia settings.
Stop at: here you can select the endpoint of the set in different ways.
- Pre-defined number of reps
- Pre-defined time.
- Absolute power threshold to stay above.
- Stop at a certain drop-off from max power.
Pre reps: extra reps before the set and the data collections starts. These reps are used for acceleration and will be discarded in the workout summary. Iso mode means 0 pre-reps, usable if you want to go from a ISO-hold into dynamic action (pinch-release).
Voice: Mute or choose auditive feedback with rep count, average, peak power, average speed or power limits. Power limits allows you to set a range and kMeter will give vocal and graphic feedback if you go outside of this range.
Auto start: kMeter Module and App senses rotation and stops by itself. Acquisition of data starts and begins without any interaction for the user on the screen.
Time display: Choose between clock or timer in the screen between sets. Timer is reset after every set and is used for timing set rest.
Display results: Choose which metrics you want to see in the summary after a completed set. All metrics are saved independent of you have them displayed or not so this will not affect the data saved, only the presentation.
Workout list: Add or remove drills, for example if you do a variation of a drill you can assign it a specific name and it will appear in the drop down list when you select exercise when saving. You can also change the order. Recommended is that you put your most common exercises at the top since they then will appear at the top of the drop down list when saving and that will save you time.
Research mode: if activated this will remove turn the ‘share’ button in the set summary into a ‘send’ button. Instead of saving a screen dump of the summary you will send a -csv file with raw data from the set. It’s recommended this setting is turned off.
Graph shows pre-reps (faded) and training reps with average or peak power values or average force for every rep. In peak power mode you get one column for CON phase (light brown) and one for ECC phase (dark brown) to track ECC overload rep by rep. With power limits activated you will see a gray area indicating that pre-set target range.
Use stop to manually stop data acquisition.
The rotation of the flywheel indicates motion but doesn’t correlate to actual rotation speed.
You can select which numbers to show and not in setup > display results
POWER AND FORCE
Average power = average power for all reps in set (except pre-reps) both CON and ECC phase.
CONC peak power = average CON peak power during all CON phases in the set (To see CON peak for every individual rep look in graph).
Average overload % = ECC peak power / CON peak power
Relative peak power = W / kg or W / lbs body weight
Average force = Approximated force based on calculations from ROM and power. Not to be used between users or exercises but works as an approximation for certain exercises by a certain user.
Range of motion = how long the the average rep was (in centimeters) over the whole set.
Average speed = average rep speed in m/s over the whole set.
Generated energy = energy put into the flywheel in kJ (not your expenditure).
Repetitions = number of reps performed.
Workout time = duration of the set.
Inertia = the inertia you set in setup.
VAS = Visual analogue scale. User input after workout summary in display. Stored in database with all other data. Can be used to track effort or pain for example.
Press arrows up/down beside graph to switch view between average power, peak power and estimated force values.
SAVING YOUR DATA
You can press ‘share’ to save a screen dump of the summary to your camera roll. If ‘research mode’ is activated this button will say ‘send’ and you will then send raw data from the set in a .csv file.
You can edit the data, ie discard certain reps remove them from the summary by pressing ‘edit’.
Save the data by pressing ‘save’ and you will be able to change user, add exercise, RPE/VAS, comment.
Your saved data is accessible via ‘Results’ from the start screen. Here you can edit the set if you want to change user/exercise, RPE or comment. You can also filter your sets on a specific user and share the data by selecting the sets and press send. Data will then be compiled in a .csv file ready for email export. Open it up in Excel.
Go back to the kMeter Manual.
Understanding the feedback
The kMeter app receives rotational data from the kMeter via bluetooth. The power is calculated and presented as average power per rep and peak power in CON and ECC to determine eccentric overload.
The power data is exact and consistent. Number of reps, rep time and energy expenditure are also exact while vertical motion (ROM) and force are more complicated calculation with more variables and should be considered as an approximation.
ROM and force data should not be used to compare different athletes or exercises but to be used in the same athlete and exercise. It can give information of progress overtime or changes with different inertial loading.
If you still want a kMeter walkthrough sign up for our free online kMeter intro course here.
Testing your power
The kMeter provides accurate power monitoring, but to get data comparable between users and over time, a standardized test protocol is necessary. The kBox Power Test defines in detail how the exercise should be performed and documented. Read more.