Tags

Type your tag names separated by a space and hit enter

Inverse activation between the deeper vastus intermedius and superficial muscles in the quadriceps during dynamic knee extensions.
Muscle Nerve. 2013 May; 47(5):682-90.MN

Abstract

INTRODUCTION

We sought to determine the neuromuscular activation patterns of 4 synergistic muscles of the quadriceps femoris (QF), including the vastus intermedius (VI) muscle, during dynamic knee extensions.

METHODS

Nine healthy men performed dynamic knee extensions in the range of 20-100% of the one-repetition maximum (1RM) load. Surface electromyography (EMG) was recorded from the 4 muscles of the QF.

RESULTS

The normalized EMG amplitude of the VI was significantly higher at knee joint angles between 90° and 115° during both the concentric and eccentric phases, and it was significantly lower between 140° and 165° during concentric and eccentric phases, compared with those of vastus lateralis at 60-100% of 1RM load (P < 0.05).

CONCLUSIONS

These results suggest that the VI plays a key role during dynamic knee extension with flexed joint angles and specifically contributes to the initial concentric and final eccentric phases of knee joint movements.

Authors+Show Affiliations

Research Center of Health, Physical Fitness & Sports, Nagoya University, Furo, Chikusa, Nagoya, Aichi 4648601, Japan. akima@nagoya-u.jpNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23504547

Citation

Akima, Hiroshi, and Akira Saito. "Inverse Activation Between the Deeper Vastus Intermedius and Superficial Muscles in the Quadriceps During Dynamic Knee Extensions." Muscle & Nerve, vol. 47, no. 5, 2013, pp. 682-90.
Akima H, Saito A. Inverse activation between the deeper vastus intermedius and superficial muscles in the quadriceps during dynamic knee extensions. Muscle Nerve. 2013;47(5):682-90.
Akima, H., & Saito, A. (2013). Inverse activation between the deeper vastus intermedius and superficial muscles in the quadriceps during dynamic knee extensions. Muscle & Nerve, 47(5), 682-90. https://doi.org/10.1002/mus.23647
Akima H, Saito A. Inverse Activation Between the Deeper Vastus Intermedius and Superficial Muscles in the Quadriceps During Dynamic Knee Extensions. Muscle Nerve. 2013;47(5):682-90. PubMed PMID: 23504547.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inverse activation between the deeper vastus intermedius and superficial muscles in the quadriceps during dynamic knee extensions. AU - Akima,Hiroshi, AU - Saito,Akira, Y1 - 2013/03/16/ PY - 2012/08/21/accepted PY - 2013/3/19/entrez PY - 2013/3/19/pubmed PY - 2013/6/20/medline SP - 682 EP - 90 JF - Muscle & nerve JO - Muscle Nerve VL - 47 IS - 5 N2 - INTRODUCTION: We sought to determine the neuromuscular activation patterns of 4 synergistic muscles of the quadriceps femoris (QF), including the vastus intermedius (VI) muscle, during dynamic knee extensions. METHODS: Nine healthy men performed dynamic knee extensions in the range of 20-100% of the one-repetition maximum (1RM) load. Surface electromyography (EMG) was recorded from the 4 muscles of the QF. RESULTS: The normalized EMG amplitude of the VI was significantly higher at knee joint angles between 90° and 115° during both the concentric and eccentric phases, and it was significantly lower between 140° and 165° during concentric and eccentric phases, compared with those of vastus lateralis at 60-100% of 1RM load (P < 0.05). CONCLUSIONS: These results suggest that the VI plays a key role during dynamic knee extension with flexed joint angles and specifically contributes to the initial concentric and final eccentric phases of knee joint movements. SN - 1097-4598 UR - https://www.unboundmedicine.com/medline/citation/23504547/Inverse_activation_between_the_deeper_vastus_intermedius_and_superficial_muscles_in_the_quadriceps_during_dynamic_knee_extensions_ L2 - https://doi.org/10.1002/mus.23647 DB - PRIME DP - Unbound Medicine ER -