NCT04139187

Biomechanics Responses to Power and Strength Combined Training

Lower Extremities Biomechanics Responses to Power and Strength Combined Training in Adults: a Randomized Clinical Trial

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 32 (estimated)
• Sponsor: Universidade Federal de Santa Maria · Academic / Other
• Sex: Male
• Age: 18 Years – 30 Years
• Healthy volunteers: Accepted

Summary

Anterior cruciate ligament (ACL) is the most frequently injured knee ligament during performance of recreational activities and sports. In the United States, the annual incidence is 68.6 per 100,000 people per year and in Brazil, the estimation of ACL reconstruction increases 64%. There are different biomechanical profiles of risk factors for an ACL injury variable, the ligament dominance, the quadriceps dominance, the trunk dominance, and the leg dominance. Thus, the purpose of this study is to investigate the biomechanics adaptations after power and strength combined training protocol in healthy individuals. A second aim is to determine the effect of the training on knee injury risk factors.

Detailed description

This is a parallel randomized clinical trial comparing the effect of combined training with power and strength exercises on lower extremity biomechanics in healthy individuals. The sample size was calculated with G\*Power software using the ANOVA: Repeated measures, within-between interaction, 90% power, alpha 0.05, and 30% drop-out. Data from the tuck jump test (knee flexion range) by Makaruk (2014) were considered for this calculation with effect size 0.46. Thus, a total of 32 individuals (16 per group) is required for this study. To ensure the proper simple size, after collecting the first five participants per group, the sample size will be checked again. The participants will be randomized in experimental and no intervention groups inside each risk profile group. Randomization ratio will be 1:1 and interventions will last 10 weeks, with two weekly sessions for the exercise arms. The outcomes will include functional clinical tests, kinematic and kinetic variables during landing tasks, and strength of knee and hip muscles. The data analysis will be performed by intention to treat and per protocol. Generalized estimating equations will be used to identify interaction effects of groups and time followed by Bonferroni post-hoc. When effect are found, effect size will be estimated. Missing data will be estimate by statistical analysis.

Conditions

• Healthy

Interventions

Type	Name	Description
OTHER	Combined training with power and strength exercises	The training will be compose by power and strength exercises and divided in two days. One day with the exercises: vertical jumps, box jumps, sit-ups, back-extension and guided squat. The second with half squat jumps, high straight jumps, bounding jumps, drop jumps and sprint. Both days will be started with warm up on treadmill running lasting 5 minutes at 6.5-7.5 km/h. The training protocol includes 20 sessions with 2 sessions per week during 10 weeks (2 weeks to adaptation and others 8 to training with progression of load after 4 weeks).

Timeline

• Start date: 2019-09-15
• Primary completion: 2020-12-01
• Completion: 2020-12-01
• First posted: 2019-10-25
• Last updated: 2020-06-04

Locations

1 site across 1 country: Brazil