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Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
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Loaded Vertical Jumping: Force-Velocity Relationship, Work, and Power.

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Loaded vertical jumps reliably assess leg muscle force-velocity (F-V) relationships and reveal adaptations to increased load. This method can evaluate muscle capacity and movement mechanics under varying conditions.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Science

Background:

  • The force-velocity (F-V) relationship is crucial for understanding muscle function.
  • Assessing F-V relationships in dynamic movements like vertical jumps is important for performance analysis.
  • Understanding how external load affects F-V parameters and muscle work is key for training.

Purpose of the Study:

  • To investigate the F-V relationship pattern in leg muscles during loaded vertical jumps.
  • To evaluate the reliability and concurrent validity of F-V parameters derived from these jumps.
  • To examine how changes in external load influence muscle work and power output.

Main Methods:

  • Participants performed maximal vertical countermovement jumps with loads from 0-40% body mass.
  • Ground reaction forces, leg joint kinematics, and kinetics were recorded.
  • F-V relationship parameters (slope, intercepts) and power were calculated and analyzed for reliability and validity.

Main Results:

  • A strong, near-linear F-V relationship was observed (r = 0.78-0.93).
  • F-V parameters and calculated power demonstrated moderate to high reliability (ICC = 0.67-0.91).
  • Increased load reduced jump depth and power but increased total work, with greater knee contribution.

Conclusions:

  • Loaded vertical jumps offer a reliable method for assessing leg muscle F-V characteristics.
  • This methodology can provide insights into neuromuscular adaptations to different loading conditions.
  • The findings support the use of loaded vertical jumps for both performance testing and understanding movement mechanics.