Validation of the Dynamometer LABIN
Condition: Healthy Volunteers
Study type: Interventional

Summary: 
      The main objective of this work is to validate the dynamometer LABIN in comparison with the
      technique of gold-standard reference JAMAR, in a healthy population.

      The infringement of the prehension is frequent and impacts on the social and professional
      quality of life of the patients. There are numerous instruments measuring the strength of
      prehension. The JAMAR is a mechanical, hydraulic dynamometer, exploring in kilograms the
      maximal strength of the prehension. It is at present Gold Standard for the measure of the
      strength of prehension. There is for the moment no electronic known instrument exploring the
      endurance of the strength of prehension during an effort of tightening. This parameter would
      indeed be interesting for the exploration in geriatrics and in the neuromuscular pathologies.

      This study justifies itself by the fact that the dynamometer LABIN should allow the
      evaluation of the muscular endurance of the strength of hand as complement of the peak of
      strength
    

Detailed description: 
      Measure of the strength of prehension with JAMAR and LABIN according to the following
      protocol:

        -  Position: the subject sits comfortably on a chair without armrests, feet put on the
           ground, the pond at the bottom of the seat, the hips and the knees in 90 ° of flexion,
           shoulder in adduction and neutral rotation, the elbow bent in 90 °, forearm in neutral
           position, the wrist between 0 and 30 ° of extension and between 0 and 15 ° of slope
           ulnaire. The dynamometer is vertically presented and in front of the forearm to maintain
           the standardized positions.

        -  Test: regulation of the zero by making a vacuous acquisition during 5 seconds. The order
           "Jamar then Labin" or Labin then Jamar is chosen by randomization. The operator
           encourages the subject to every test. The subject does not see the curve displaying.

        -  Test: 3 clampings of a handle of a dynamometer LABIN by the right hand during 5 seconds,
           with a break of 30 seconds between the tests. After 2 minutes of break the subjects make
           3 clampings with a left hand. After that , the same session is realized with the
           dynamometer JAMAR

      The order "Jamar then Labin" or Labin then Jamar is chosen by randomization. The operator
      encourages the subject to every test. The subject does not see the curve displaying.

      Total duration of participation in the study for the patient: 30 minutes

      Main analysis: the calculation of the coefficient of correlation (Pearson or Spearman with
      regard to the statistical distribution), coefficient of linen concordance and the coefficient
      of intra-classy correlation.
    

Intervention name(s): Dynamometer LABIN
Intervention type(s): Device
Intervention description(s): LABIN is a prototype of dynamometer containing a handle of metal strength, connected with a sensor of pressure registering(recording) the applied strength and transmitting the data in a computer showing an IT curve of the strength according to time.
Allocation: Randomized
Intervention model: Crossover Assignment
Masking: None (Open Label)
Primary purpose: Diagnostic
Keywords: Dynamometer mechanic; Strength of prehension; Comparison; Device; Diagnosis; Healthy Volunteers