Load Control in Eccentric Exercises in Volleyball Players
Condition: Patellar Abnormality
MeSH terms: Congenital Abnormalities
Study type: Interventional

Summary: 
      Introduction. Vertical jump is the main movement in volleyball, and the main etiological
      factor of patellar tendinopathy. The eccentric exercise has been proved as the most effective
      intervention in improving this factor.

      Aim. Annalise the effectiveness of the load control during the eccentric exercise to increase
      the cross-sectional area as well as the increase of the pain threshold of the patellar
      tendon, and the gain of the quadriceps maximum strength, in volleyball older players.

      Study design. Randomized clinical study, simple blind, multicentric and with a follow-up
      period.

      Methods. 40 volleyball players will be recruited, who will be randomized to the two groups:
      experimental (control of the load based on the RM during the eccentric exercise of
      quadriceps) and control (without load control). There will be an intervention of 4 weeks with
      2 weekly seasons of 10 minutes each. The dependent variables will be: cross-sectional area
      (ultrasound evaluation), pain threshold in the patellar tendon (analog or digital algometer)
      and the maximum strength of the quadriceps (linear encoder or estimating the RM). In case of
      normality of the distribution of the sample, parametric tests will be used: student t-test of
      related samples (difference between evaluations in each rump) and repeated measures ANOVA
      (intra- and intergroup effect).

      Expected results. To observe an increase in the cross-sectional area, pain-threshold of
      patellar tendon and quadriceps maximum strength.
    


Intervention name(s): Experimental; Control
Intervention type(s): Other; Other
Intervention description(s): The athletes will perform an intervention of 4 weeks, with two weekly sessions, in which the intervention will be performed during the training, with these sessions lasting 10 minutes. During the performance of the intervention, they will perform 3 sets of 15 repetitions of squats in a 25º inclined plane, performing the eccentric phase of the squat in a time of 4 seconds, the concentric phase in 3 seconds, and a rest of 15 seconds between series. This intervention will be performed adding 50% of his OR as external load during the first two weeks, 55% of his MR during the third week, and 60% of his MR in the fourth week of the intervention. During the exercise you can help the physiotherapist who will accompany you to perform the concentric phase without load.; Intervention of 4 weeks, with two weekly sessions, in which the intervention will be carried out during the training, these sessions having a duration of 10 minutes. During the performance of the intervention, they will perform 3 sets of 15 squat repetitions on a 25º inclined plane, performing the eccentric phase of the squat in a time of 4 seconds, the concentric phase in 3 seconds, and a 15-second rest between series. The subjects of this group will perform the protocol using only their own weight as a load.
Other intervention name(s): Load control in eccentric exercises; Eccentric exercises
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary purpose: Prevention
Keywords: Eccentric; Load control; Volleyball; Physiotherapy; Patellar tendon; Randomized clinical trial