Anchoring and Its Effects on Postural Stability
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 72
- 试验地点
- 1
- 主要终点
- Mean Break-Point Force at the Right Anterior Superior Iliac Spine
研究概览
简要总结
This study will compare standing balance in adults ages 18 to 50 during normal standing, inward anchoring, and outward anchoring. Anchoring involves standing with the feet wider than shoulder width and trying to pull the legs together or push them apart without moving the feet. Participants will complete all three conditions in a randomly assigned order. A researcher will use a handheld force-measuring instrument at six points on the pelvis to measure how much pressure participants can resist before a foot lifts from the floor. Participants will also rate how stable they feel after each anchoring condition. The first 18 participants will repeat assessments to evaluate measurement consistency. Participation is expected to last 60 minutes, or 90 minutes for those completing repeat assessments.
详细描述
The study will enroll 72 adults from the University of Central Florida community. Participants will be randomized with equal probability to one of six counterbalanced orders of normal stance, inward anchoring, and outward anchoring. Every participant will complete all three conditions.
Inward anchoring involves attempting to draw the legs toward one another without moving the feet. Outward anchoring involves attempting to press the legs away from one another without moving the feet. Both anchoring conditions use a stance wider than shoulder width. Participants will wear their usual athletic footwear.
The same tester will apply a microFET2 handheld dynamometer at the right and left anterior superior iliac spines, iliac crests, and posterior superior iliac spines. Applied pressure will increase until the sole of the foot closest to the tester leaves the floor, at which point force will be recorded in newtons. Each site will be tested three times in each stance. Rest periods will be one minute between sets within a stance and two minutes between stances. Instructions for the next stance will be given during the final minute of the between-stance rest period.
After each anchoring condition, participants will rate perceived stability. The first 18 participants will complete additional repeat assessments for intrarater reliability analysis. The protocol plans repeated-measures analyses for stance/order comparisons and intraclass correlation coefficients for reliability.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Screening
- 盲法
- Double (Investigator, Outcomes Assessor)
盲法说明
The assessor will be masked to the anchoring method
入排标准
- 年龄范围
- 18 Years 至 50 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Adults aged 18-50 years.
- •Able to provide informed consent and independently read, write, and communicate in English.
排除标准
- •History of neurological or vestibular conditions affecting balance, such as stroke, Parkinson's disease, multiple sclerosis, or vertigo, or uncorrected/inadequately corrected visual deficits affecting postural control.
- •Lower-extremity or spinal injury, orthopedic surgery, or a musculoskeletal condition within the past 6-12 months that may affect balance, force production, or safe participation.
- •Current pain or dysfunction limiting safe standing or weight-bearing tasks.
- •Use of medications that may affect balance, coordination, or muscle performance, such as muscle relaxants, opioids, or sedatives.
- •A cardiovascular or systemic condition that makes participation unsafe, such as uncontrolled hypertension, dizziness, or syncope, or inability to stand independently for the duration of testing.
研究组 & 干预措施
Normal Stance → Inward Anchoring → Outward Anchoring
Participants complete normal stance, then inward anchoring, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Normal Stance → Inward Anchoring → Outward Anchoring
Participants complete normal stance, then inward anchoring, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Normal Stance → Inward Anchoring → Outward Anchoring
Participants complete normal stance, then inward anchoring, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
Normal Stance → Outward Anchoring → Inward Anchoring
Participants complete normal stance, then outward anchoring, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Normal Stance → Outward Anchoring → Inward Anchoring
Participants complete normal stance, then outward anchoring, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Normal Stance → Outward Anchoring → Inward Anchoring
Participants complete normal stance, then outward anchoring, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
Outward Anchoring → Normal Stance → Inward Anchoring
Participants complete outward anchoring, then normal stance, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Outward Anchoring → Normal Stance → Inward Anchoring
Participants complete outward anchoring, then normal stance, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Outward Anchoring → Normal Stance → Inward Anchoring
Participants complete outward anchoring, then normal stance, then inward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
Outward Anchoring → Inward Anchoring → Normal Stance
Participants complete outward anchoring, then inward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Outward Anchoring → Inward Anchoring → Normal Stance
Participants complete outward anchoring, then inward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Outward Anchoring → Inward Anchoring → Normal Stance
Participants complete outward anchoring, then inward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
Inward Anchoring → Normal Stance → Outward Anchoring
Participants complete inward anchoring, then normal stance, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Inward Anchoring → Normal Stance → Outward Anchoring
Participants complete inward anchoring, then normal stance, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Inward Anchoring → Normal Stance → Outward Anchoring
Participants complete inward anchoring, then normal stance, then outward anchoring. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
Inward Anchoring → Outward Anchoring → Normal Stance
Participants complete inward anchoring, then outward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Normal Stance (Other)
Inward Anchoring → Outward Anchoring → Normal Stance
Participants complete inward anchoring, then outward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Inward Anchoring (Other)
Inward Anchoring → Outward Anchoring → Normal Stance
Participants complete inward anchoring, then outward anchoring, then normal stance. The same force assessments are performed in each condition, with two minutes of rest between conditions.
干预措施: Outward Anchoring (Other)
结局指标
主要结局
Mean Break-Point Force at the Right Anterior Superior Iliac Spine
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the right anterior superior iliac spine during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance
Mean Break-Point Force at the Left Anterior Superior Iliac Spine
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the left anterior superior iliac spine during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance.
Mean Break-Point Force at the Right Iliac Crest
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the right iliac crest during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance
Mean Break-Point Force at the Left Iliac Crest
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the left iliac crest during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance.
Mean Break-Point Force at the Right Posterior Superior Iliac Spine
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the right posterior superior iliac spine during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance.
Mean Break-Point Force at the Left Posterior Superior Iliac Spine
时间窗: Day 1
A microFET2 handheld dynamometer is applied at the left posterior superior iliac spine during normal stance, inward anchoring, and outward anchoring. Force in newtons is recorded when the sole of the foot closest to the tester leaves the floor. Three readings are collected per stance.
Perceived Stability Rating After Inward Anchoring
时间窗: Day 1
After inward anchoring, participants answer how stable they felt during that stance. Ratings range from 0 (not at all stable) to 10 (completely stable); 5 means neutral, or the same stability as normal standing. Higher scores indicate greater perceived stability.
Perceived Stability Rating After Outward Anchoring
时间窗: Day 1
After outward anchoring, participants answer how stable they felt during that stance. Ratings range from 0 (not at all stable) to 10 (completely stable); 5 means neutral, or the same stability as normal standing. Higher scores indicate greater perceived stability
次要结局
未报告次要终点
研究者
William J. Hanney
Professor
University of Central Florida