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Muscle Coordination and Action

Muscle Coordination and Action

Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....

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Updated: Mar 2, 2026

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

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Quantifying Lower-Limb Muscle Coordination During Cycling Using Electromyography-Informed Muscle Synergies.

Reza Ahmadi¹, Shahram Rasoulian², Hamidreza Heidary¹

¹Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada.

Annals of Biomedical Engineering

|March 1, 2026

Summary

This summary is machine-generated.

Muscle coordination in cycling changes with power output, revealing how the nervous system adapts. Synergy indices offer insights for rehabilitation and performance optimization.

Keywords:

Biomechanics EMG Motor control Neuromuscular coordination Stationary cycle ergometer

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Area of Science:

Biomechanics
Motor Control
Neuroscience

Background:

Muscle coordination is crucial for efficient movement.
Understanding neuromuscular strategies in cycling informs performance and rehabilitation.

Purpose of the Study:

To evaluate lower-limb muscle synergy patterns during cycling at different power levels.
To use muscle synergies as indicators of neuromuscular coordination and motor control.

Main Methods:

Twenty cyclists underwent graded cycling tests.
Electromyography (EMG) data from seven lower-limb muscles were analyzed.
Non-negative matrix factorization was used to extract muscle synergies; Synergy Index (SI) and Synergy Coordination Index (SCI) were calculated.

Main Results:

Four muscle synergies were consistent across power levels.
SI at the hip remained stable, but decreased at the knee and increased at the ankle with higher power.
SCI increased significantly with increasing cycling power levels.

Conclusions:

The central nervous system modulates muscle synergies in response to increased mechanical demands.
Synergy indices provide a valuable method for assessing motor control in cycling.
Findings can inform rehabilitation strategies and performance optimization for cyclists.