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Unique activation of the quadriceps femoris during single- and multi-joint exercises.
Eur J Appl Physiol. 2016 May; 116(5):1031-41.EJ

Abstract

PURPOSE

This study aimed to examine whether muscle activation of the quadriceps femoris differs between single- and multi-joint exercises, and to explore the factors resulting in muscle and exercise specificity in activation.

METHODS

Eleven adults developed isometric hip extension torque gradually while maintaining submaximal isometric knee extension torque (Experiment 1). In Experiment 2, 15 men performed knee extension and leg press separately at intensities of 20, 40, 60 and 80 % of their one repetition maximum (1RM) load, and 14 men conducted leg press at intensities of 40 and 80 % of 1RM until exhaustion (Experiment 3). Muscle activation during exercises was measured using surface electromyography from the rectus femoris, vastus lateralis and medialis.

RESULTS

The addition of isometric hip extension torque significantly decreased rectus femoris activation (Experiment 1). In Experiment 2, the rectus femoris activation was significantly higher during knee extension than during leg press, whereas no differences were observed in the vasti. The rectus femoris activation was not significantly different between leg press at 80 % and knee extension at 20 % of 1RM. The results of Experiment 3 showed significant increases in vasti activation at both intensities, whereas rectus femoris activation did not change at 80 % of 1RM.

CONCLUSION

The results revealed that even at high intensity, the rectus femoris activation during multi-joint exercise is low and does not increase with fatigue, unlike the vasti, and that the inter-muscle and inter-exercise differences in activation depend on whether hip extension torque is exerted in the exercise.

Authors+Show Affiliations

Graduate School of Engineering and Science, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama-shi, 337-8570, Saitama, Japan. i039491@sic.shibaura-it.ac.jp. Research Fellow of Japan Society for the Promotion of Science, Chiyoda-ku, Tokyo, Japan. i039491@sic.shibaura-it.ac.jp.Human Performance Lab, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.College of Systems Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan.Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.

Pub Type(s)

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

Language

eng

PubMed ID

27032805

Citation

Ema, Ryoichi, et al. "Unique Activation of the Quadriceps Femoris During Single- and Multi-joint Exercises." European Journal of Applied Physiology, vol. 116, no. 5, 2016, pp. 1031-41.
Ema R, Sakaguchi M, Akagi R, et al. Unique activation of the quadriceps femoris during single- and multi-joint exercises. Eur J Appl Physiol. 2016;116(5):1031-41.
Ema, R., Sakaguchi, M., Akagi, R., & Kawakami, Y. (2016). Unique activation of the quadriceps femoris during single- and multi-joint exercises. European Journal of Applied Physiology, 116(5), 1031-41. https://doi.org/10.1007/s00421-016-3363-5
Ema R, et al. Unique Activation of the Quadriceps Femoris During Single- and Multi-joint Exercises. Eur J Appl Physiol. 2016;116(5):1031-41. PubMed PMID: 27032805.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Unique activation of the quadriceps femoris during single- and multi-joint exercises. AU - Ema,Ryoichi, AU - Sakaguchi,Masanori, AU - Akagi,Ryota, AU - Kawakami,Yasuo, Y1 - 2016/03/31/ PY - 2015/10/15/received PY - 2016/03/14/accepted PY - 2016/4/2/entrez PY - 2016/4/2/pubmed PY - 2016/12/28/medline KW - Biarticular muscle KW - Electromyography KW - Hip extension KW - Knee extension KW - Leg extension SP - 1031 EP - 41 JF - European journal of applied physiology JO - Eur. J. Appl. Physiol. VL - 116 IS - 5 N2 - PURPOSE: This study aimed to examine whether muscle activation of the quadriceps femoris differs between single- and multi-joint exercises, and to explore the factors resulting in muscle and exercise specificity in activation. METHODS: Eleven adults developed isometric hip extension torque gradually while maintaining submaximal isometric knee extension torque (Experiment 1). In Experiment 2, 15 men performed knee extension and leg press separately at intensities of 20, 40, 60 and 80 % of their one repetition maximum (1RM) load, and 14 men conducted leg press at intensities of 40 and 80 % of 1RM until exhaustion (Experiment 3). Muscle activation during exercises was measured using surface electromyography from the rectus femoris, vastus lateralis and medialis. RESULTS: The addition of isometric hip extension torque significantly decreased rectus femoris activation (Experiment 1). In Experiment 2, the rectus femoris activation was significantly higher during knee extension than during leg press, whereas no differences were observed in the vasti. The rectus femoris activation was not significantly different between leg press at 80 % and knee extension at 20 % of 1RM. The results of Experiment 3 showed significant increases in vasti activation at both intensities, whereas rectus femoris activation did not change at 80 % of 1RM. CONCLUSION: The results revealed that even at high intensity, the rectus femoris activation during multi-joint exercise is low and does not increase with fatigue, unlike the vasti, and that the inter-muscle and inter-exercise differences in activation depend on whether hip extension torque is exerted in the exercise. SN - 1439-6327 UR - https://www.unboundmedicine.com/medline/citation/27032805/Unique_activation_of_the_quadriceps_femoris_during_single__and_multi_joint_exercises_ L2 - https://dx.doi.org/10.1007/s00421-016-3363-5 DB - PRIME DP - Unbound Medicine ER -