Figure 6. Maximum amplitude of gastrocnemius for aged people, left leg; (a) for standing, (b) for sitting

From

EMG Signals for Co-Activations of Major Lower Limb Muscles in Knee Joint Dynamics

Md. T. I. Khan, T. Kurita

Biomedical Science and Engineering. 2015, 3(1), 9-14 doi:10.12691/bse-3-1-3