NCT03865862

Load Control in Eccentric Exercises in Volleyball Players

Efficacy of Load Control in Eccentric Exercises in the Increase of the Cross-sectional Area and Pain Threshold of the Patellar Tendon, and of the Strength of the Quadriceps in Volleyball Players. A Randomized Clinical Trial

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 40 (actual)
• Sponsor: Investigación en Hemofilia y Fisioterapia · Network
• Sex: Male
• Age: 18 Years – 35 Years
• Healthy volunteers: Accepted

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.

Conditions

• Patellar Abnormality

Interventions

Type	Name	Description
OTHER	Experimental	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.
OTHER	Control	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.

Timeline

• Start date: 2019-03-10
• Primary completion: 2019-04-15
• Completion: 2019-06-20
• First posted: 2019-03-07
• Last updated: 2020-01-27

Locations

1 site across 1 country: Spain