Biceps Femoris (Long Head) (BF Long R)
The M. Biceps Femoris Caput Longum (Biceps Femoris (Long Head)) is a muscle of the thigh posterior region. It is responsible for knee flexion, hip extension and external rotation, external rotation of the lower leg with flexed knee. This muscle is one of 26 with official SENIAM-recommended surface EMG electrode placement. This page documents the exact electrode position, anatomical attachments and a standardized test movement based on Hermens et al. (2000).
Knee flexion, hip extension and external rotation, external rotation of the lower leg with flexed knee
50% on line between ischial tuberosity and lateral epicondyle
Orientation: Parallel to line ischial tuberosity-lateral epicondyle
Hermens HJ, Freriks B, Disselhorst-Klug C, Rau G. Development of recommendations for SEMG sensors and sensor placement procedures. J Electromyogr Kinesiol. 2000;10(5):361-74.
Based on SENIAM recommendations (Hermens et al. 2000). Not an official SENIAM product. See all references \u2192
Knee flexion in prone position against resistance with foot external rotation
Common use cases for surface EMG measurement of the M. Biceps Femoris Caput Longum:
50% on line between ischial tuberosity and lateral epicondyle. Orientation: Parallel to line ischial tuberosity-lateral epicondyle. Based on the official SENIAM recommendations (Hermens et al. 2000).
Knee flexion in prone position against resistance with foot external rotation. This movement is part of the SENIAM protocol for standardized contraction verification.
Yes. The M. Biceps Femoris Caput Longum is one of 26 muscles for which the SENIAM project has published official surface EMG electrode placement recommendations.
Interactive SENIAM electrode placement — free, instant access, no sign-up required.
Open 3D Viewer →Electrode placement guides, EMG tips and updates — free via email.
Professional EMG biofeedback software for PicoBlue sensors. Real-time visualization, 5 training modes, PDF reports.