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Muscular coordination of biceps brachii and brachioradialis in elbow flexion with respect to hand position.

Kleiber T, Kunz L, Disselhorst-Klug C - Front Physiol (2015)

Bottom Line: Normalized to MVC the sEMG amplitudes of both muscles contributing to elbow flexion movements were compared in pronated, supinated, and neutral hand position over elbow joint angle.Significant differences in the contribution of brachioradialis were found in pronated hand position compared to supinated and neutral hand position while the muscular activity of biceps brachii shows no significant changes in any hand position.In conclusion, a statistical significant dependency of the inter-muscular coordination between biceps brachii and brachioradialis during elbow flexion with respect to hand position has been observed depending on a biomechanical disadvantage of biceps brachii.

View Article: PubMed Central - PubMed

Affiliation: Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University Aachen, Germany ; German Research School for Simulation Sciences, Joint Graduate School of RWTH Aachen University and Forschungszentrum Jülich Jülich, Germany.

ABSTRACT
Contribution of synergistic muscles toward specific movements over multi joint systems may change with varying position of distal or proximal joints. Purpose of this study is to reveal the relationship of muscular coordination of brachioradialis and biceps brachii during elbow flexion with respect to hand position and biomechanical advantages and disadvantages of biceps brachii. A group of 16 healthy subjects has been advised to perform 20 repetitions of single elbow flexion movements in different hand positions (pronated, neutral, and supinated). With a speed of 20°/s, simultaneously sEMG of biceps brachii and brachioradialis and kinematics of the movement were recorded in a motion analysis laboratory. Normalized to MVC the sEMG amplitudes of both muscles contributing to elbow flexion movements were compared in pronated, supinated, and neutral hand position over elbow joint angle. Significant differences in the contribution of brachioradialis were found in pronated hand position compared to supinated and neutral hand position while the muscular activity of biceps brachii shows no significant changes in any hand position. In conclusion, a statistical significant dependency of the inter-muscular coordination between biceps brachii and brachioradialis during elbow flexion with respect to hand position has been observed depending on a biomechanical disadvantage of biceps brachii.

No MeSH data available.


Full marker setup for kinematic analysis of upper extremity including joint marker of acromion (a), elbow joint (b) and wrist (c) as well as marker triplets on the segments thorax (d), upper arm (e), forearm (f), and hand (g). Bipolar sEMG electrode placement including pre-amplifier with blue LEDs of biceps brachii (h) and brachioradialis (i).
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Figure 1: Full marker setup for kinematic analysis of upper extremity including joint marker of acromion (a), elbow joint (b) and wrist (c) as well as marker triplets on the segments thorax (d), upper arm (e), forearm (f), and hand (g). Bipolar sEMG electrode placement including pre-amplifier with blue LEDs of biceps brachii (h) and brachioradialis (i).

Mentions: Bipolar sEMG signals of biceps brachii and brachioradialis muscle are recorded and processed according to standard protocols developed with the SENIAM recommendations (Hermens et al., 2000). Single-use Ambu® Blue Sensor N electrodes (effective electrode diameter of 3 mm) were placed in a distance of 2 cm on the muscle belly directly connected to a pre-amplifier (blue LED). The full marker setup and electrode placement is shown in Figure 1.


Muscular coordination of biceps brachii and brachioradialis in elbow flexion with respect to hand position.

Kleiber T, Kunz L, Disselhorst-Klug C - Front Physiol (2015)

Full marker setup for kinematic analysis of upper extremity including joint marker of acromion (a), elbow joint (b) and wrist (c) as well as marker triplets on the segments thorax (d), upper arm (e), forearm (f), and hand (g). Bipolar sEMG electrode placement including pre-amplifier with blue LEDs of biceps brachii (h) and brachioradialis (i).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526813&req=5

Figure 1: Full marker setup for kinematic analysis of upper extremity including joint marker of acromion (a), elbow joint (b) and wrist (c) as well as marker triplets on the segments thorax (d), upper arm (e), forearm (f), and hand (g). Bipolar sEMG electrode placement including pre-amplifier with blue LEDs of biceps brachii (h) and brachioradialis (i).
Mentions: Bipolar sEMG signals of biceps brachii and brachioradialis muscle are recorded and processed according to standard protocols developed with the SENIAM recommendations (Hermens et al., 2000). Single-use Ambu® Blue Sensor N electrodes (effective electrode diameter of 3 mm) were placed in a distance of 2 cm on the muscle belly directly connected to a pre-amplifier (blue LED). The full marker setup and electrode placement is shown in Figure 1.

Bottom Line: Normalized to MVC the sEMG amplitudes of both muscles contributing to elbow flexion movements were compared in pronated, supinated, and neutral hand position over elbow joint angle.Significant differences in the contribution of brachioradialis were found in pronated hand position compared to supinated and neutral hand position while the muscular activity of biceps brachii shows no significant changes in any hand position.In conclusion, a statistical significant dependency of the inter-muscular coordination between biceps brachii and brachioradialis during elbow flexion with respect to hand position has been observed depending on a biomechanical disadvantage of biceps brachii.

View Article: PubMed Central - PubMed

Affiliation: Department of Rehabilitation and Prevention Engineering, Institute of Applied Medical Engineering, RWTH Aachen University Aachen, Germany ; German Research School for Simulation Sciences, Joint Graduate School of RWTH Aachen University and Forschungszentrum Jülich Jülich, Germany.

ABSTRACT
Contribution of synergistic muscles toward specific movements over multi joint systems may change with varying position of distal or proximal joints. Purpose of this study is to reveal the relationship of muscular coordination of brachioradialis and biceps brachii during elbow flexion with respect to hand position and biomechanical advantages and disadvantages of biceps brachii. A group of 16 healthy subjects has been advised to perform 20 repetitions of single elbow flexion movements in different hand positions (pronated, neutral, and supinated). With a speed of 20°/s, simultaneously sEMG of biceps brachii and brachioradialis and kinematics of the movement were recorded in a motion analysis laboratory. Normalized to MVC the sEMG amplitudes of both muscles contributing to elbow flexion movements were compared in pronated, supinated, and neutral hand position over elbow joint angle. Significant differences in the contribution of brachioradialis were found in pronated hand position compared to supinated and neutral hand position while the muscular activity of biceps brachii shows no significant changes in any hand position. In conclusion, a statistical significant dependency of the inter-muscular coordination between biceps brachii and brachioradialis during elbow flexion with respect to hand position has been observed depending on a biomechanical disadvantage of biceps brachii.

No MeSH data available.