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Field-Based and Lab-Based Assisted Jumping: Unveiling the Testing and Training Implications.

James J Tufano1, Jan Malecek1, Michal Steffl1

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Summary

Field-based assisted jumping with shorter bands reduces ground contact time but may alter neuromuscular responses compared to lab-based setups. Longer bands in lab settings are better for optimizing force production and minimizing ground contact time.

Keywords:
assistimpactjumpperceived exertionplyometricpower

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Area of Science:

  • Biomechanics
  • Sports Science
  • Exercise Physiology

Background:

  • Assisted jumping is a training method to enhance vertical jump performance.
  • Field-based and lab-based setups may yield different biomechanical outcomes.

Purpose of the Study:

  • To compare ground contact time (CT), takeoff force (TOF), flight time (FT), and impact force (IF) between field-based and lab-based assisted jumping setups.
  • To inform coaches on selecting appropriate assisted jumping methodologies.

Main Methods:

  • Eighteen active males performed countermovement jumps using two assisted jumping setups: field-based (shorter resistance bands) and lab-based (longer elastic bands with pulleys).
  • Jumps were performed at varying assistance levels (90% to 60% of bodyweight).
  • Ground contact time, takeoff force, flight time, and impact force were measured using force plates.

Main Results:

  • Field-based setups showed significantly shorter ground contact times at 80%, 70%, and 60% assistance.
  • Flight times were greater in the field-based setup at 90% and 80% assistance.
  • Takeoff forces were consistently lower in the field-based setup, while impact forces were generally higher.

Conclusions:

  • Lab-based setups with longer bands and finite adjustments are recommended for reducing ground contact time while maintaining force output.
  • Field-based setups with shorter bands may alter neuromuscular characteristics due to variable assistance, warranting further investigation.