Time to Stabilization in Postural Control during Sudden Perturbations among Groups of Chronic Ankle Instability, Ankle Sprain Coper, and Healthy Control = Time to Stabilization in Postural Control during Sudden Perturbations among Groups of Chronic Ankle Instability, Ankle Sprain Coper, and Healthy Control
저자
발행기관
학술지명
권호사항
발행연도
2022
작성언어
-주제어
KDC
600
자료형태
학술저널
수록면
164-165(2쪽)
제공처
OBJECTIVES
Lateral ankle sprains often occur during physical activities in the general and athletic populations. People with a history of ankle sprains often develop into chronic ankle instability (CAI). CAI is a multi-factorial condition characterized by pathomechanical, sensory-perceptual, and motor-behavior impairments. The motor- behavior impairments include strength weakness, slowed reflex reactions, altered neuromuscular control, reduced somatosensation, and/or reduced postural control. Postural control deficits are often reported in patients with CAI, and people with lateral ankle sprains. Moreover, postural control impairment has been identified as a strong risk factor for lateral ankle sprains in CAI. While there are various variables to identify an ability of postural control including center of pressure (COP, excursion, velocity, 95% of area, and/or time to boundary, time to stabilization has been the most reliable measure to identify deficits in postural control in individuals with and without CAI. The time to stabilization is the ability to maintain the equilibrium condition following a sudden, unexpected postural sway during various jump landing tasks. While lateral ankle sprains occur in sudden, unexpected conditions during functional movement, previous studies have examined postural control during controlled, expected environmental settings. Another limitation of the previous study is that those with a history of lateral ankle sprains are deficits in the lateral part of the ankle structure, which could reduce medial and lateral ankle joint stability. However, the current postural control measures do not consider directional deficits in postural control during various movement tasks. To fill the current research gap, the current study used a sudden, unexpected perturbation platform, which can create perturbation conditions of anterior, posterior, medial and lateral directions separately in a random order. The purpose of the study is to identify a directional deficit in postural control during a single-leg stance test among groups of CAI patients, ankle sprain copers, and healthy controls. As lateral ankle sprains are associated with damage to the lateral part of the ligaments, and unstable joint stability of the lateral ankle structure, we hypothesized that CAI patients and ankle sprain copers would show impaired postural control in only medial and lateral directions when a sudden perturbation is given to medial and lateral directions.
METHODS
This study was a controlled laboratory case-control study to compare postural control among groups of CAI, ankle sprain coper, and healthy control during a single-leg stance test while given a sudden, unexpected perturbations. Thirsty volunteer participants were recruited from a university population for this study. Subject selection criteria were chosen based on the recommendations of the International Ankle Consortium. Participants were selected using self-reported questionnaires including foot and ankle ability measure - activities of daily living (FAAM-ADL), FAAM-Sports, and cumberland ankle instability tool (CAIT). Subject demographic information is as follow: CAI group (7M, 3F; 29.6 ± 2.7 yrs; 170.6 ± 8.5 cm; 76.6 ± 13.9 kg; 3.6 ± 1.2 previous sprains), coper group (7M, 3F; 28.6 ± 3.6 yrs; 172.7 ± 8.0 cm; 73.2 ± 14.3 kg; 1.5 ± 1.6 previous sprains), healthy control group (7M, 3F; 27.9 ± 1.5 yrs; 170.2 ± 6.9 cm; 67.8 ± 6.9 kg). We used a sudden, unexpected perturbation platform, XY stage which was developed by DGIST in the department of Robotics Engineering. Subjects were instructed to stand for 15-sec in a single-leg stance position while looking at the target away from 5 m in front while sudden perturbations were given to the participants in a random order with four different directions of anterior, posterior, medial, and lateral. The time to stabilization (TTS) was calculated using in-house Matlab codes. The TTS was identified when anterior- posterior (AP) or medial-lateral (ML) ground reaction force (GRF) was maintained for the first 1 sec with ± 5% of static standing position of the baseline testing. 3x4 (group x direction) two-way ANOVAs analysis was used to identify an interaction of group and direction effect, and Tukey’s HSD post-hoc pairwise comparisons were used to identify significant differences between groups and directions. All statistical analysis was set p<.05.
RESULTS
We found a significant interaction between the group and direction (AP TTS: F2,119=3.4783; P<.01, MLTTS: F2,119=4.6787; P<.01). Specifically, compared to the healthy control group, CAI group shows delayed AP TTS (CAI group: 7.07 ± 3.51 sec; healthy control group: 2.24 ± 1.23 sec; P<.01) and delayed ML TTS (CAI group: 8.36 ± 3.78 sec; healthy control group: 2.50 ± 1.82 sec; P<.01) during medial direction perturbations. Compared to the healthy control group, the CAI group showed delayed AP TTS (CAI group: 9.28 ± 3.88 sec; healthy control group: 2.13 ± 2.00 sec; P<.01), and ML TTS (CAI group: 11.73 ± 0.93 sec; healthy control group: 3.07 ± 2.37 sec; P<.01) during lateral direction perturbations. Relative to the healthy control group, the ankle sprain coper group showed delayed AP TTS (coper group: 6.61 ± 2.49 sec; healthy control group: 2.24 ± 1.23 sec; P<.01), and MLTTS (coper group: 8.01 ± 3.29 sec; healthy control group: 2.50 ± 1.82 sec; P<.01) during the medial direction perturbations. Relative to the healthy control groups, the ankle sprain coper group showed delayed AP TTS (coper group: 8.51 ± 2.62 sec; healthy control group: 2.13 ± 2.00 sec; P<.01), and MLTTS (coper group: 10.78 ± 2.25 sec; healthy control group: 3.07 ± 2.37 sec; P<.01) during the lateral direction perturbations. No differences in TTS were found between the CAI group and the coper group.
CONCLUSIONS
Reduced postural control can increase the risk of lateral ankle sprains. Among various variables in postural control, TTS is the most reliable measure to assess one’s postural control ability. As lateral ankle sprains occur in a sudden, unexpected situation during functional movement, a measure of postural control should be changed. A robotic-based perturbation platform would enable us to create unexpected perturbation conditions and allows us to provide a perturbation with a selected direction. The current results show people with a history of lateral ankle sprains had delayed TTS when the sudden perturbations were given to the medial and lateral directions compared to the healthy controls. Those with a history of lateral ankle sprains have postural controls deficits in the frontal-plane, and thus, reflexive and perturbation based balance training should be given to the medial and lateral directions during rehabilitation.
분석정보
서지정보 내보내기(Export)
닫기소장기관 정보
닫기권호소장정보
닫기오류접수
닫기오류 접수 확인
닫기음성서비스 신청
닫기음성서비스 신청 확인
닫기이용약관
닫기학술연구정보서비스 이용약관 (2017년 1월 1일 ~ 현재 적용)
학술연구정보서비스(이하 RISS)는 정보주체의 자유와 권리 보호를 위해 「개인정보 보호법」 및 관계 법령이 정한 바를 준수하여, 적법하게 개인정보를 처리하고 안전하게 관리하고 있습니다. 이에 「개인정보 보호법」 제30조에 따라 정보주체에게 개인정보 처리에 관한 절차 및 기준을 안내하고, 이와 관련한 고충을 신속하고 원활하게 처리할 수 있도록 하기 위하여 다음과 같이 개인정보 처리방침을 수립·공개합니다.
주요 개인정보 처리 표시(라벨링)
목 차
3년
또는 회원탈퇴시까지5년
(「전자상거래 등에서의 소비자보호에 관한3년
(「전자상거래 등에서의 소비자보호에 관한2년
이상(개인정보보호위원회 : 개인정보의 안전성 확보조치 기준)개인정보파일의 명칭 | 운영근거 / 처리목적 | 개인정보파일에 기록되는 개인정보의 항목 | 보유기간 | |
---|---|---|---|---|
학술연구정보서비스 이용자 가입정보 파일 | 한국교육학술정보원법 | 필수 | ID, 비밀번호, 성명, 생년월일, 신분(직업구분), 이메일, 소속분야, 웹진메일 수신동의 여부 | 3년 또는 탈퇴시 |
선택 | 소속기관명, 소속도서관명, 학과/부서명, 학번/직원번호, 휴대전화, 주소 |
구분 | 담당자 | 연락처 |
---|---|---|
KERIS 개인정보 보호책임자 | 정보보호본부 김태우 | - 이메일 : lsy@keris.or.kr - 전화번호 : 053-714-0439 - 팩스번호 : 053-714-0195 |
KERIS 개인정보 보호담당자 | 개인정보보호부 이상엽 | |
RISS 개인정보 보호책임자 | 대학학술본부 장금연 | - 이메일 : giltizen@keris.or.kr - 전화번호 : 053-714-0149 - 팩스번호 : 053-714-0194 |
RISS 개인정보 보호담당자 | 학술진흥부 길원진 |
자동로그아웃 안내
닫기인증오류 안내
닫기귀하께서는 휴면계정 전환 후 1년동안 회원정보 수집 및 이용에 대한
재동의를 하지 않으신 관계로 개인정보가 삭제되었습니다.
(참조 : RISS 이용약관 및 개인정보처리방침)
신규회원으로 가입하여 이용 부탁 드리며, 추가 문의는 고객센터로 연락 바랍니다.
- 기존 아이디 재사용 불가
휴면계정 안내
RISS는 [표준개인정보 보호지침]에 따라 2년을 주기로 개인정보 수집·이용에 관하여 (재)동의를 받고 있으며, (재)동의를 하지 않을 경우, 휴면계정으로 전환됩니다.
(※ 휴면계정은 원문이용 및 복사/대출 서비스를 이용할 수 없습니다.)
휴면계정으로 전환된 후 1년간 회원정보 수집·이용에 대한 재동의를 하지 않을 경우, RISS에서 자동탈퇴 및 개인정보가 삭제처리 됩니다.
고객센터 1599-3122
ARS번호+1번(회원가입 및 정보수정)