The Relationship Between Upper Extremity, Trunk and Hip Muscle Strength and the Modified Upper Quarter Y-balance Test
Background: Various functional tests such as upper quarter Y-balance test (UQYBT) are used to evaluate shoulder stability and mobility in clinical or sports fields. Previous studies have been conducted to determine the correlation between the scapular or trunk muscle and UQYBT. However, the corre...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Research Society of Physical Therapy
2023-08-01
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| Series: | Physical Therapy Korea |
| Subjects: |
| Summary: | Background: Various functional tests such as upper quarter Y-balance test (UQYBT) are used
to evaluate shoulder stability and mobility in clinical or sports fields. Previous studies have been
conducted to determine the correlation between the scapular or trunk muscle and UQYBT.
However, the correlation between UQYBT and hip flexor, which can be considered as a core
muscle, has not been confirmed.
Objects: To verify the relationship between the UQYBT and scapular muscle (scapular protractor
and lower trapezius [LT]), trunk muscle, and hip flexor strengths in healthy male participants.
Methods: A total of 37 healthy male participants were recruited and underwent UQYBT in
the push-up posture. The isometric strength of the scapular protractor, LT, trunk flexor and extensor,
and hip flexors were measured using a smart KEMA strength sensor (KOREATECH Inc.).
Results: The superolateral direction of the UQYBT was moderately to strongly related to trunk
extensor (r = 0.443, p < 0.01), scapular protractor (r = 0.412, p < 0.05), LT (r = 0.436, p
< 0.01), and both sides of the hip flexors (supporting-side: r = 0.669, p < 0.01; non-supporting-
side: r = 0.641, p < 0.01). The inferolateral direction of the UQYBT was moderately
related to the scapular protractor (r = 0.429, p < 0.01), LT (r = 0.511, p < 0.01), and both
sides of hip flexors (supporting-side: r = 0.481, p < 0.01; non-supporting-side: r = 0.521,
p < 0.01). The medial direction of the UQYBT was moderately to strongly related with the
scapular protractor (r = 0.522, p < 0.01), LT (r = 0.541, p < 0.01), and both sides of hip
flexors (supporting-side: r = 0.605, p < 0.01; non-supporting-side: r = 0.561, p < 0.01).
Conclusion: This study showed that the strength of the scapular muscles, trunk muscles, and
hip flexor muscles correlated to the UQYBT. Therefore, the strength of not only the scapular
and trunk muscles but also the hip flexor muscles should be considered to improve the UQYBT. |
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| ISSN: | 1225-8962 2287-982X |