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Accommodating Resistance Training (Isokinetic)

Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 1 min read
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In one line

Machines that control the speed of contraction so the limb moves at constant velocity and the muscle is loaded maximally through the full range of motion.

Detail

Accommodating resistance devices attempt to control the speed of contraction through various mechanisms, including electronic servo-motor control systems and hydraulic chambers. They are described as accommodating resistance machines because they attempt to exactly match the variation in torque produced throughout a movement with an appropriate resistance. Thus, the limb moves with a constant angular velocity, and the muscle group is trained maximally through the range of motion.

Examples of these machines include the Cybex (Isokinetic Dynamometer), Kincom, Biodex, and Orthotron systems.

Key facts

  • Controls speed of contraction via servo-motor or hydraulic mechanisms.
  • Matches resistance to the torque produced throughout the movement.
  • Limb moves at constant angular velocity; muscle trained maximally through ROM.
  • Examples: Cybex (Isokinetic Dynamometer), Kincom, Biodex, Orthotron.

Connections

  • variable-resistance — both aim for maximal loading through ROM; this controls velocity rather than load shape.
  • dcer — contrasts with constant external resistance.
  • specificity — testing specificity affects measured gains.
SourceReference manual
p.692
Pages: 692.
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Atlas Connections

"Muscle Action" vs. "Contraction" — The Terminology Argument
Because a muscle can shorten, hold, or lengthen, calling every state a "contraction" is misleading — so the term "muscle action" is proposed instead.
Principle of Specificity (SAID)
Training adaptations are specific to how you train — match the muscles, movements, and posture of the target activity to get carryover.
Intensity
The amount of weight (resistance) lifted — also shaped by speed, reps, sets, rest interval, and workout duration.
Dynamic Constant External Resistance (DCER) Training
The accurate term for free-weight and machine training where the external weight stays constant but the muscle force required varies through the movement.
Variable Resistance Training (Machines, Cams)
Machines using cams, lever arms, or pulleys that change the resistance to match the muscle's strength curve, so it contracts near-maximally throughout the range of motion.