Effects of a Strength Training Program in Inertial Machines on Bosco Test in Youth Volleyball Players

Study Overview
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Brief Summary
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Objective: To determine the effect of strength training in inertial machines, on SJ CMJ and CMJ with arms; in youth volleyball players from the city of Cartago. Methodology: A quasi-experimental study of quantitative order was carried out and takes up an empirical-analytical approach, quasi-experimental with pre-test - post-test evaluation. 32 female volleyball players, belonging to the minor category of the Fénix G Club of the city of Cartago Valle Results: Both groups showed significant improvements in jump height, flight time, strength and power in the protocol that was carried out during the 12 weeks of intervention, but there was no statistically significant difference between the control groups (P = 0.356). , experimental (P = 0.984) Conclusions: Keywords: Inertial machines, Squat jump, Countermovent Jump, Abalakov

Detailed Description
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Objective: To determine the effect of strength training in inertial machines, on SJ CMJ and CMJ with arms; in youth volleyball players from the city of Cartago. Methodology: A quasi-experimental study of quantitative order was carried out and takes up an empirical-analytical approach, quasi-experimental with pre-test - post-test evaluation. 32 female volleyball players, belonging to the minor category of the Fénix G Club of the city of Cartago Valle. The techniques that were used were: survey to determine previous injuries, adaptations that athletes may have against strength training and practice time in volleyball, observations were also developed to determine the levels of jumpability of each player, taking into account the Bosco's battery (3). For this we used: My jumps 2 application for IOS devices, it was used to determine the height of the CMJ, SJ, CMJ or ABK, this app was validated in 2015 by the creator, Dr. Carlos Balsalobre (15). Wheeler YOYO XS inertial machine contains an encoder validated by the company Chronjump (16) with this device the training program was carried out with the volleyball players, the program was subjected to expert judgment. For the collection of information on sociodemographic variables, a data record was carried out (Weight, Height, History of injuries, etc.), in addition to this, a record per athlete for the values of each jump performed. Results: Both groups showed significant improvements in jump height, flight time, strength and power in the protocol that was carried out during the 12 weeks of intervention, but there was no statistically significant difference between the control groups (P = 0.356). , experimental (P = 0.984) Conclusions: Keywords: Inertial machines, Squat jump, Countermovent Jump, Abalakov

Official Title
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Effects of a Strength Training Program in Inertial Machines on Squat Jump, Countermovement Jump and Abalakov in Youth Volleyball Players

Conditions
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Volleyball, Player, Female

Intervention / Treatment
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* Device: Inertial Strength training


Participation Criteria
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Eligibility Criteria
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Inclusion criterio That they express their participation voluntarily in the investigation by filling out their informed consent in the informed settlement. Sports aptitude in the execution of the tests at the time of the intervention and/or evaluation, do not present any surgical intervention in any particular area or region of the lower limbs. Practice time in volleyball of at least 2 years and 1 year in strength training Exclusion Criteria: Presenting serious sports injuries 6 months before or during the data collection phase (pre-test and post-test) and application of training with inertial machines. not complete with at least 8 weeks of strength training on the inertial machine.

Ages Eligible for Study
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Minimum Age: 15 Years
Maximum Age: 17 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: The athletes were divided into two experimental and control groups, for which the experimental group was asked to carry out a protocol that consisted of 12 weeks of intervention divided in a randomized manner, resulting in a pre and post intervention measurement
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group 1<br>Strength training in inertial machines for 2 days and around 12 weeks. | Device: Inertial Strength training<br>* Low speed strength training with classic movements, derived from Olympic lifting and jumping<br>* Other names: Conventional strength training;|
| Active Comparator: Group 2<br>Control group developed conventional strength training with squats, deadlifts, hip thrust jumps for 2 days and around 12 weeks. | Device: Inertial Strength training<br>* Low speed strength training with classic movements, derived from Olympic lifting and jumping<br>* Other names: Conventional strength training;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Independent variable: Inertial machine program | Power (watt) | 12 weeks of intervention | 
| Dependent variable: countermovement jump, squat jump and abalakov. | Squat position with arms at the waist looking for a countermovement and height, the following jump squat position hold for 5 seconds and look for height without taking the hands off the waist, finally the abalakov is a jump with loose arms performing a countermovement and looking height. | 12 weeks of intervention | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To compare the differences pre and post strength training in inertial versus conventional machines, pre-post control experiment on the SJ, CMJ and ABK in youth volleyball players. | Squat position with arms at the waist looking for a countermovement and height, the following jump squat position hold for 5 seconds and look for height without taking the hands off the waist, finally the abalakov is a jump with loose arms performing a countermovement and looking height. | 12 weeks of intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Keywords: Inertial machines, Squat jump, Countermovent Jump, Abalakov