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European Journal of Applied Physiology

, Volume 119, Issue 7, pp 1611–1617 | Cite as

Effect of hip angle on neuromuscular activation of the adductor longus and adductor magnus muscles during isometric hip flexion and extension

  • Takuya KatoEmail author
  • Keigo Taniguchi
  • Hiroshi Akima
  • Kohei Watanabe
  • Yuma Ikeda
  • Masaki Katayose
Original Article

Abstract

Purpose

Neuromuscular activation of the adductor longus (AL) and adductor magnus (AM) muscles at different hip flexion angles during hip flexion and extension has not been clarified. This study aimed to compare the relationship between hip flexion angle and the electromyogram of the AL muscle with that of the AM muscle during isometric hip flexion and extension.

Methods

Fifteen healthy young men were included in this study. Participants performed maximal voluntary contractions during hip flexion and extension at six different hip flexion angles: − 20°, 0°, 20°, 40°, 60°, and 80°. The surface electromyograms of the AL and AM muscles were recorded. The root mean square (RMS) was calculated and normalized by the RMS during hip adduction for each individual muscle.

Results

The normalized RMS of the AL muscle was significantly higher than that of the AM muscle at a hip flexion angle of − 20° during hip flexion (P < 0.05). The mean normalized RMS of the AM muscle was significantly higher than that of the AL muscle during hip extension (P < 0.01).

Conclusion

These results suggest that the AL muscle is recruited specifically at the hip-extended position during hip flexion, and that the AM muscle is recruited regardless of the hip position during hip extension. Thus, the AL and AM muscles may have different functional roles in different hip flexion angles.

Keywords

Hip adductor muscle group Isometric contraction Hip angle Neuromuscular activation 

Abbreviations

AL

Adductor longus

AM

Adductor magnus

ANOVA

Analysis of variance

EMG

Electromyography

HA

Hip adductor

MVC

Maximal voluntary contraction

QF

Quadriceps femoris

RMS

Root mean square

Notes

Acknowledgements

We thank all of the volunteers who participated in this study.

Author contributions

TK, TA, and IY conceived and designed the study. HA, KW, and MK were involved in the research design. TA, TK, and IY conducted the experiments. TA, TA, and IY analyzed the data. TA wrote the manuscript. All authors read and approved the manuscript.

Funding

This study received no funding.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All experimental protocols were approved by the Medical Research Ethics Committee at Sapporo Medical University (approval number: 27-2-27).

Informed consent

The procedure, purpose, and risks associated with this study were explained to the subjects, and written informed consent was obtained.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Center of Sports MedicineObihiro Kyokai HospitalObihiroJapan
  2. 2.Second Division of Physical Therapy, School of Health ScienceSapporo Medical UniversitySapporoJapan
  3. 3.Research Center of Health, Physical Fitness and SportsNagoya UniversityNagoyaJapan
  4. 4.School of International Liberal StudiesChukyo UniversityNagoyaJapan
  5. 5.Division of RehabilitationSapporo Medical University HospitalSapporoJapan
  6. 6.Graduate School of Health ScienceSapporo Medical UniversitySapporoJapan

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