Effects of a Strength Training Program in Inertial Machines on Bosco Test in Youth Volleyball Players
Condition: Volleyball; Player; Female
Study type: Interventional

Summary: 
      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: 
      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
    

Intervention name(s): Inertial Strength training
Intervention type(s): Device
Intervention description(s): Low speed strength training with classic movements, derived from Olympic lifting and jumping
Other intervention name(s): Conventional strength training
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention 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 (Investigator)
Primary purpose: Prevention
Keywords: Keywords: Inertial machines; Squat jump; Countermovent Jump; Abalakov