The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test
# Background The Y-Balance Test (YBT), especially the posteromedial (PM) reach direction (PM-YBT), is able to identify dynamic postural control deficits in those who have ankle instability. However, there still exists a need to understand how sensorimotor function at the ankle explains the performa...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
North American Sports Medicine Institute
2023-10-01
|
| Series: | International Journal of Sports Physical Therapy |
| Online Access: | https://doi.org/10.26603/001c.87760 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1825197052649275392 |
|---|---|
| author | Shojiro Nozu Kristin A. Johnson Tsukasa Tanaka Mika Inoue Hirofumi Nishio Yuji Takazawa |
| author_facet | Shojiro Nozu Kristin A. Johnson Tsukasa Tanaka Mika Inoue Hirofumi Nishio Yuji Takazawa |
| author_sort | Shojiro Nozu |
| collection | DOAJ |
| description | # Background
The Y-Balance Test (YBT), especially the posteromedial (PM) reach direction (PM-YBT), is able to identify dynamic postural control deficits in those who have ankle instability. However, there still exists a need to understand how sensorimotor function at the ankle explains the performance during the PM-YBT.
# Hypothesis/Purpose
The purpose of this study was to determine whether the ability to accurately control eccentric ankle torque explained PM-YBT performance. It was hypothesized that eccentric dorsiflexion/plantarflexion torque control would be positively related to the maximum reach distance (MRD) of PM-YBT.
# Study Design
Cross-sectional study
# Methods
Twelve healthy subjects performed the PM-YBT, maximum voluntary isometric contractions (MVIC) for both dorsiflexion and plantarflexion muscle strength, and then the torque control testing of the ankle. The torque control testing provided a target torque level on a screen in front of the subject and passive rotations of the ankle joint in the sagittal plane at 10 deg/sec between plantarflexion to dorsiflexion. Subjects were then instructed to eccentrically contract the dorsiflexors and plantar flexors to generate torque while the ankle joint rotated. The accuracy of torque control during eccentric dorsiflexion and plantarflexion by calculating absolute errors, the area between the target torque and the produced torque were evaluated. Tibialis anterior and soleus muscle activities were simultaneously recorded during testing. A step-wise linear regression model was used to determine the best model predicted the MRD of the PM-YBT (PM-MRD).
# Results
A step-wise linear regression developed a model explaining only eccentric dorsiflexion torque control predicted higher PM-MRD score (R^2^ = 44%, F~1,10~ = 7.94, β = -0.67, p = 0.02).
# Conclusion
The accuracy of torque control during eccentric dorsiflexion predicts better performance in the PM-YBT.
# Level of Evidence
3b |
| format | Article |
| id | doaj-art-e7f0793de3884ae8850f65dc46124daf |
| institution | Kabale University |
| issn | 2159-2896 |
| language | English |
| publishDate | 2023-10-01 |
| publisher | North American Sports Medicine Institute |
| record_format | Article |
| series | International Journal of Sports Physical Therapy |
| spelling | doaj-art-e7f0793de3884ae8850f65dc46124daf2025-02-11T20:27:28ZengNorth American Sports Medicine InstituteInternational Journal of Sports Physical Therapy2159-28962023-10-01185The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance TestShojiro NozuKristin A. JohnsonTsukasa TanakaMika InoueHirofumi NishioYuji Takazawa# Background The Y-Balance Test (YBT), especially the posteromedial (PM) reach direction (PM-YBT), is able to identify dynamic postural control deficits in those who have ankle instability. However, there still exists a need to understand how sensorimotor function at the ankle explains the performance during the PM-YBT. # Hypothesis/Purpose The purpose of this study was to determine whether the ability to accurately control eccentric ankle torque explained PM-YBT performance. It was hypothesized that eccentric dorsiflexion/plantarflexion torque control would be positively related to the maximum reach distance (MRD) of PM-YBT. # Study Design Cross-sectional study # Methods Twelve healthy subjects performed the PM-YBT, maximum voluntary isometric contractions (MVIC) for both dorsiflexion and plantarflexion muscle strength, and then the torque control testing of the ankle. The torque control testing provided a target torque level on a screen in front of the subject and passive rotations of the ankle joint in the sagittal plane at 10 deg/sec between plantarflexion to dorsiflexion. Subjects were then instructed to eccentrically contract the dorsiflexors and plantar flexors to generate torque while the ankle joint rotated. The accuracy of torque control during eccentric dorsiflexion and plantarflexion by calculating absolute errors, the area between the target torque and the produced torque were evaluated. Tibialis anterior and soleus muscle activities were simultaneously recorded during testing. A step-wise linear regression model was used to determine the best model predicted the MRD of the PM-YBT (PM-MRD). # Results A step-wise linear regression developed a model explaining only eccentric dorsiflexion torque control predicted higher PM-MRD score (R^2^ = 44%, F~1,10~ = 7.94, β = -0.67, p = 0.02). # Conclusion The accuracy of torque control during eccentric dorsiflexion predicts better performance in the PM-YBT. # Level of Evidence 3bhttps://doi.org/10.26603/001c.87760 |
| spellingShingle | Shojiro Nozu Kristin A. Johnson Tsukasa Tanaka Mika Inoue Hirofumi Nishio Yuji Takazawa The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test International Journal of Sports Physical Therapy |
| title | The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test |
| title_full | The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test |
| title_fullStr | The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test |
| title_full_unstemmed | The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test |
| title_short | The Accuracy of Ankle Eccentric Torque Control Explains Dynamic Postural Control During the Y-Balance Test |
| title_sort | accuracy of ankle eccentric torque control explains dynamic postural control during the y balance test |
| url | https://doi.org/10.26603/001c.87760 |
| work_keys_str_mv | AT shojironozu theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT kristinajohnson theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT tsukasatanaka theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT mikainoue theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT hirofuminishio theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT yujitakazawa theaccuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT shojironozu accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT kristinajohnson accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT tsukasatanaka accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT mikainoue accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT hirofuminishio accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest AT yujitakazawa accuracyofankleeccentrictorquecontrolexplainsdynamicposturalcontrolduringtheybalancetest |