kMeter Manual: App Usage

An overview of the functions of the kMeter app.



IMG_1195Connect 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.


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.

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 auditative feedback with rep count, average, peak power 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.

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.

During acquisition

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.Foto 2015-11-09 10 36 46

Use stop to manually stop data acquisition.

The rotation of the flywheel indicates motion but doesn’t correlate to actual rotation speed.


Workout summary

You can select which numbers to show and not in setup > display results 


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).

ECC peak power = average ECC peak power during all ECC phases in the set (To see ECC peak for every individual rep look in graph).Foto 2016-05-09 12 00 09

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.


Go back to the kMeter Manual.



Understanding the feedback

kMeter iconThe 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.


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.