We have an isometric contraction when the muscle contracts but because of an external resistance its length remains unchanged.
The force expressed during the isometric contraction produces an increase of the muscle tension that can be easily estimated by a load cell
The isometric strenght assessment enables to investigate with ACCURACY and PRECISION some basic aspects of performances and muscular conditions. :
Isometric maximum force
Time of isometric muscular activation
Strenght unbalance among homologous and agonist/antagonist limbs
Resistance to an isometric maximal contraction
Resistance to a muscular strain
FEATURES OF ISOMETRIC ASSESSMENT:
- EASINESS OF CARRYING OUT
- REPEATITIVITY OF TEST
- SUBJECT SAFETY
- POST-INJURY FIRST FORCE EVALUATION
- Max Isometric Force Peak (FMAX)
- Time to achieve the peak of maximum force. (T100)
- Maximum Force Peak (F.MAX)
- Time to achieve the FMAX peak(T100)
- T30: time to achieve the 30% of FMAX Peak
- T50: time to achievep the 50% of FMAX Peak
- T90: time to achieve the 90% of FMAX Peak
The comparison among the average values expressed by the symmetrical muscular groups, gives a precise indications about the existing unbalance and, subsequently, on the realised progresses.
The test determines the isometric force of each muscular group and the unbalance expressed in percentage value.
The test determines the fatigue resistance measuring the time in which the expressed force is remained inside the foreseen values.
The parameters to be set are the following:
- Force target
- Range of variation controlled by biofeedback.