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Related Experiment Video

Updated: Jul 5, 2026

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

Published on: September 3, 2021

Interlimb coupling strength scales with movement amplitude.

C Lieke E Peper¹, Betteco J de Boer, Harjo J de Poel

¹Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands. C E Peper@fbw.vu.nl

Neuroscience Letters

|April 22, 2008

Summary

This summary is machine-generated.

Interlimb coordination strength increases with movement amplitude. The study found that the arm with a larger movement amplitude exerted a stronger influence on the contralateral arm during bimanual tasks.

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Method to Measure Tone of Axial and Proximal Muscle

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

Area of Science:

Neuroscience
Biomechanics
Human Movement Science

Background:

Interlimb coordination is crucial for complex motor tasks.
The influence of movement amplitude on interlimb coupling is not fully understood.
Previous models suggest amplitude disparities affect coupling asymmetry.

Purpose of the Study:

To investigate the relationship between movement amplitude and interlimb interaction strength.
To test the hypothesis that larger amplitude movements exert greater influence.
To analyze coupling strength using an index derived from perturbation recovery.

Main Methods:

Participants performed rhythmic bimanual forearm movements at varying amplitude ratios (1:2, 1:1, 2:1).
Mechanical perturbations were applied to one arm to observe relaxation dynamics.
Phase adaptations in the unperturbed arm were measured to quantify coupling strength (Index of Coupling - IC).

Main Results:

The Index of Coupling (IC) was significantly larger when the perturbed arm moved at a greater amplitude.
This indicates that coupling strength scales directly with movement amplitude.
Asymmetry in coupling was observed, with the larger amplitude limb having a stronger influence.

Conclusions:

Movement amplitude is a critical factor modulating interlimb coupling strength.
Findings support neurophysiological predictions and the HKB model of coupled oscillators.
Amplitude disparity plays a significant role in the asymmetry of interlimb coordination.