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A method for controlling a movable resistance element belonging to a training device. The resistance element is influenced by a user with a muscular force. A device is adapted to generate a reference signal for controlling a power conversion device coupled to and controlling a movable resistance ele

A method for controlling a movable resistance element belonging to a training device. The resistance element is influenced by a user with a muscular force. A device is adapted to generate a reference signal for controlling a power conversion device coupled to and controlling a movable resistance element belonging to a training device, and which is influenced by a user with a muscular force. A computer program for carrying out the method and a use of the device.

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1. A method for controlling a movable resistance element belonging to a training device when a user exercises with the training device, the resistance element being adapted to be influenced by the user with a muscular force, the method comprising: receiving a signal comprising information on the mus

1. A method for controlling a movable resistance element belonging to a training device when a user exercises with the training device, the resistance element being adapted to be influenced by the user with a muscular force, the method comprising: receiving a signal comprising information on the muscular force with which the user influences the resistance element,calculating and generating a reference signal, based on the received muscular force signal and a mathematical model for the response of the resistance element, andcontrolling a power conversion device based on the reference signal, the power conversion device being coupled to and controlling the movable resistance element, so that the user experiences a desired resistance when influencing the resistance element. 2. The method according to claim 1, further comprising: sequentially receiving new values for said muscular force signal throughout the exercise, andsequentially recalculating and generating new reference signals based on the new values of the muscular force signal, in order to control the power conversion device and the resistance element throughout the exercise. 3. The method according to claim 1, further comprising: receiving a new value for said muscular force signal within at least 30 ms from a previously received muscular force signal. 4. The method according to claim 1, further comprising: continuously recalculating and generating said reference signal based on the most recently received muscular force signal in order to control the power conversion device. 5. The method according to claim 1, further comprising: measuring said muscular force with a force sensor. 6. The method according to claim 1, further comprising: controlling a power conversion device comprising an electrical engine coupled to and arranged to influence the resistance element with an engine force. 7. The method according to claim 1 wherein said reference signal comprises information on a desired movement speed for the resistance element. 8. The method according to claim 1, wherein said reference signal is calculated based on a mathematical model comprising information on at least two different resistance levels, and wherein the power conversion device is controlled so that the user experiences a first resistance level during a first part of a movement cycle, and a second resistance level during a second part of the movement cycle. 9. The method according to claim 8, further comprising: determining whether the muscle of the user is in a concentric or eccentric work phase, andcontrolling the power conversion device, so that the user experiences a first resistance level during the concentric work phase and a second, higher resistance level during the eccentric work phase. 10. The method according to claim 1 wherein the mathematical model comprises a mathematical model of a weight moving in a gravitational field. 11. The method according to claim 1, further comprising: evaluating the condition of the muscle of the user based on the received muscle force signal by comparing the muscle force signal with muscle force information stored in a diagnostic data base. 12. The method according to claim 1, further comprising: generating a feed-back signal to the user during the movement of the resistance element. 13. The method according to claim 1, further comprising: receiving an identity of the user, andselecting a mathematical model based on the received identity.