Pendulum

Overview

This demo builds on the pendulum_2 demo and shows a pendulum that is perturbed by a brief activation and then by a sustained contraction.

What this demo does

This demo runs a single simulation with a pendulum

• released from its-zero position
• connected to a MATMyoSim model that
  • is initially activated with a burst of Ca²⁺
  • and then with a sustained sub-maximal level of Ca²⁺

Instructions

• In MATLAB, change the working directory to <repo>/code/demos/pendulum/pendulum_3
• open demo_pendulum_3.m
• Press F5 to run

Output

You should see two figures

and

How this worked

This demo is very similar to pendulum_2 demo except that the second activation is sustained at a sub-maximal level (pCa = 5.4)

% Brief activations
pCa(2000:2200) = 4.5;
pCa(4500:8000) = 5.4;

This sustained contraction pulls the pendulum to one side and damps the oscillation due to the displacement of the cycling cross-bridges.