H-reflex in abductor hallucis and postural performance between flexible flatfoot and normal foot

Tzu Hui Huang, Li Wei Chou, Cheng Ya Huang, Shun Wa Wei, Yi Ju Tsai, Yu Jen Chen

Research output: Contribution to journalArticle

Abstract

Objective: Morphological changes of the abductor hallucis muscle (AbH) in flexible flatfoot (FF) individuals influence regulations of the medial longitudinal arch (MLA). Prolonged and repeated stretching of AbH in flexible flatfoot may cause changes in muscle reflex properties and further influence postural performance. However, AbH muscle reflex under different postural conditions have never been examined. The purpose of this study was to investigate differences in AbH H-reflex and postural performance between individuals with normal foot (NF) alignment and FF under prone, double-leg stance (DLS), and single-leg stance (SLS) conditions. Design: Cross-sectional study. Setting: University laboratory. Participants: Individuals with FF (n = 12) and NF (n = 12). Main outcome measures: AbH H-reflex, AbH EMG and center of pressure (CoP) displacement. Results: Under all postural conditions, AbH H-reflex was significantly lower in the FF group (P <.05). Under the SLS condition, AbH EMG was significantly higher in the FF group (P <.05), and CoP displacement for the medial-lateral and anterior-posterior directions were significantly higher in the FF group (P <.05). Conclusions: With increased postural demand, FF individuals maintained their postural stability by recruiting greater AbH activities than through automatic stretch reflex, but FF individuals still showed inferior posture stability.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalPhysical Therapy in Sport
Volume37
DOIs
Publication statusPublished - 2019 May

Fingerprint

Flatfoot
H-Reflex
Foot
Muscles
Leg
Reflex
Pressure
Stretch Reflex
Posture
Cross-Sectional Studies

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Huang, Tzu Hui ; Chou, Li Wei ; Huang, Cheng Ya ; Wei, Shun Wa ; Tsai, Yi Ju ; Chen, Yu Jen. / H-reflex in abductor hallucis and postural performance between flexible flatfoot and normal foot. In: Physical Therapy in Sport. 2019 ; Vol. 37. pp. 27-33.
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abstract = "Objective: Morphological changes of the abductor hallucis muscle (AbH) in flexible flatfoot (FF) individuals influence regulations of the medial longitudinal arch (MLA). Prolonged and repeated stretching of AbH in flexible flatfoot may cause changes in muscle reflex properties and further influence postural performance. However, AbH muscle reflex under different postural conditions have never been examined. The purpose of this study was to investigate differences in AbH H-reflex and postural performance between individuals with normal foot (NF) alignment and FF under prone, double-leg stance (DLS), and single-leg stance (SLS) conditions. Design: Cross-sectional study. Setting: University laboratory. Participants: Individuals with FF (n = 12) and NF (n = 12). Main outcome measures: AbH H-reflex, AbH EMG and center of pressure (CoP) displacement. Results: Under all postural conditions, AbH H-reflex was significantly lower in the FF group (P <.05). Under the SLS condition, AbH EMG was significantly higher in the FF group (P <.05), and CoP displacement for the medial-lateral and anterior-posterior directions were significantly higher in the FF group (P <.05). Conclusions: With increased postural demand, FF individuals maintained their postural stability by recruiting greater AbH activities than through automatic stretch reflex, but FF individuals still showed inferior posture stability.",
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H-reflex in abductor hallucis and postural performance between flexible flatfoot and normal foot. / Huang, Tzu Hui; Chou, Li Wei; Huang, Cheng Ya; Wei, Shun Wa; Tsai, Yi Ju; Chen, Yu Jen.

In: Physical Therapy in Sport, Vol. 37, 05.2019, p. 27-33.

Research output: Contribution to journalArticle

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