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Related Concept Videos

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
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In steady, incompressible flow through a long, straight pipe with a uniform cross-section, the flow in the central region (far from the pipe walls) is irrotational. This irrotational nature means that fluid particles do not rotate around their axes, and a scalar function called the velocity potential, represented by ϕ, can be used to describe their movement. In irrotational flows, the velocity field V is defined as the gradient of the velocity potential:
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Updated: Jul 7, 2025

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
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Kinetic Analysis, Potentiation, and Fatigue During Vertical and Horizontal Plyometric Training: An In-Depth

Casey M Watkins1,2,3, Nicholas D Gill4, Michael R McGuigan1,5

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International Journal of Sports Physiology and Performance
|December 22, 2023
PubMed
Summary

Plyometric training volume impacts jump performance differently. Horizontal broad jumps (HBJ) improved with increased volume, while countermovement jumps (CMJ) showed decrements, highlighting the need for tailored dosing strategies.

Keywords:
high-volumeimpulsejump traininglow-volume

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Plyometric training is known to enhance athletic performance.
  • Optimal strategies for plyometric training volume are not well-established.
  • Understanding dose-response relationships is crucial for effective training.

Purpose of the Study:

  • To examine the effects of increasing plyometric training volume on vertical and horizontal jump performance.
  • To investigate the kinetic responses to varying session jump volumes in rugby players.

Main Methods:

  • Sixteen rugby players participated in vertical and horizontal jump sessions.
  • A low-volume plyometric stimulus was progressively increased up to 200 jumps.
  • Jump performance was measured using force-plate analysis throughout the sessions.

Main Results:

  • Horizontal broad jump (HBJ) performance was potentiated (2-5%) and maintained throughout increased volume.
  • Countermovement jump (CMJ) performance initially decreased (-5% to -7%) before recovering.
  • Increased eccentric impulse correlated with reduced concentric impulse, suggesting impaired power transfer at higher volumes.

Conclusions:

  • Kinetic responses to plyometric training volume differ between vertical and horizontal jumps.
  • Current plyometric dosing strategies may need adjustment based on jump type.
  • Consideration of HBJ and CMJ kinetic distinctions is vital for practitioners.