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Phys. Ther. Korea 2019; 26(4): 20-28

Published online December 31, 2019

https://doi.org/10.12674/ptk.2019.26.4.020

© Korean Research Society of Physical Therapy

Relationship Between Lower Extremity Extensor Strength and Wall Squat Performance

Sung-hoon Jung1,2, Ui-jae Hwang1,2, Jun-hee Kim1,2, In-cheol Jeon4, and Oh-yun Kwon1,3,5

1Kinetic Ergocise Based on Movement Analysis Laboratory,
2Dept. of Physical Therapy, The Graduate School, Yonsei University,
3Dept. of Physical Therapy, College of Health Science, Yonsei University,
4Dept. of Physical Therapy, College of Health Science, Hoseo University,
5Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University

Correspondence to: Oh-yun Kwon kwonoy@yonsei.ac.kr

Received: September 16, 2019; Revised: September 16, 2019; Accepted: November 8, 2019

Abstract

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Background:

The wall squat exercise has been recommended for strengthening of the lower extremity muscles with maintaining lumbar lordosis. Although squat has been studied to be related to lower extremity extensor strength, the relationship between wall squat and lower extremity extensor strength unclear. Because squat and wall squat are biomechanically different, study on the relationship is needed.

Objects:

The purpose of this study was to determine the lower extremity extensor strength associated with wall squat performance.

Methods:

74 healthy volunteers were recruited to participate in this study. The volunteers were measured hip and knee extensors strength and then performed wall squat exercise for maximum count.

Results:

We found significant relationships between wall squat performance and hip extensor strength normalized by body weight, knee extensor strength normalized by body weight and the composite value. In a regression analysis, hip extensor strength normalized by body weight explained 29% of the variation in wall squat performance in males and 35% in females.

Conclusion:

These results demonstrate that hip extensor strength normalized by body weight is critical to wall squat performance in both sexes.

Keywords: Hip extensors, Isometric strength, Wall squat

Article

ARTICLE

Phys. Ther. Korea 2019; 26(4): 20-28

Published online December 31, 2019 https://doi.org/10.12674/ptk.2019.26.4.020

Copyright © Korean Research Society of Physical Therapy.

Relationship Between Lower Extremity Extensor Strength and Wall Squat Performance

Sung-hoon Jung1,2, Ui-jae Hwang1,2, Jun-hee Kim1,2, In-cheol Jeon4, and Oh-yun Kwon1,3,5

1Kinetic Ergocise Based on Movement Analysis Laboratory,
2Dept. of Physical Therapy, The Graduate School, Yonsei University,
3Dept. of Physical Therapy, College of Health Science, Yonsei University,
4Dept. of Physical Therapy, College of Health Science, Hoseo University,
5Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University

Correspondence to:Oh-yun Kwon kwonoy@yonsei.ac.kr

Received: September 16, 2019; Revised: September 16, 2019; Accepted: November 8, 2019

Abstract

Background:

The wall squat exercise has been recommended for strengthening of the lower extremity muscles with maintaining lumbar lordosis. Although squat has been studied to be related to lower extremity extensor strength, the relationship between wall squat and lower extremity extensor strength unclear. Because squat and wall squat are biomechanically different, study on the relationship is needed.

Objects:

The purpose of this study was to determine the lower extremity extensor strength associated with wall squat performance.

Methods:

74 healthy volunteers were recruited to participate in this study. The volunteers were measured hip and knee extensors strength and then performed wall squat exercise for maximum count.

Results:

We found significant relationships between wall squat performance and hip extensor strength normalized by body weight, knee extensor strength normalized by body weight and the composite value. In a regression analysis, hip extensor strength normalized by body weight explained 29% of the variation in wall squat performance in males and 35% in females.

Conclusion:

These results demonstrate that hip extensor strength normalized by body weight is critical to wall squat performance in both sexes.

Keywords: Hip extensors, Isometric strength, Wall squat

Fig 1.

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Figure 1.

Wall squat (A: Initial position, B: Full squat position).

Physical Therapy Korea 2019; 26: 20-28https://doi.org/10.12674/ptk.2019.26.4.020

Fig 2.

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Figure 2.

Strength measurement method.

Physical Therapy Korea 2019; 26: 20-28https://doi.org/10.12674/ptk.2019.26.4.020

Fig 3.

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Figure 3.

Normal probability plot of regression standardized residual in female (A: Hip extensor/body weight, B: Knee extensor/body weight).

Physical Therapy Korea 2019; 26: 20-28https://doi.org/10.12674/ptk.2019.26.4.020

Fig 4.

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Figure 4.

Normal probability plot of regression standardized residual in male (A: hip extensor/body weight, B: knee extensor/body weight).

Physical Therapy Korea 2019; 26: 20-28https://doi.org/10.12674/ptk.2019.26.4.020

Table 1 . Test results for all participants (N=74).


Table 2 . Correlations between independent variables and WSP.


Table 3 . Stepwise linear regression model for males.


Table 4 . Stepwise linear regression model for females.