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Water-Inertia-Based Dynamic Stability Training for Balance and Postural Control in Healthy Young Women

10 settembre 2026 aggiornato da: Yuanyan Huang

Effects of Water-Inertia-Based Dynamic Stability Training on Dynamic Balance and Single-Leg Postural Control in Healthy Young Women: A Randomized Controlled Trial

This randomized controlled study evaluated the effects of a 10-week dynamic stability training program using a mobile water load compared with a mass-matched stable load in healthy young women. Thirty participants were randomly assigned to either water-inertia-based unstable-load training or stable-load training. Both groups completed the same supervised exercises three times per week, using vests with the same total external mass; the main difference between groups was whether the load inside the vest was mobile or stable. Outcomes were assessed before training, after 5 weeks, and after 10 weeks. The study evaluated dynamic balance, postural sway during single-leg stance, and other physical-performance outcomes to determine whether mobile water loading produced different training adaptations from stable loading.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

This study was designed to examine whether dynamic stability training performed with a mobile water-based external load produces different physical and postural adaptations from the same training performed with a mass-matched stable external load in healthy young women. The study used a randomized, parallel-group design.

Healthy female university students aged 19-25 years who had not participated in resistance training during the previous 12 months were recruited. After baseline assessment, 30 eligible participants were randomly assigned in a 1:1 ratio to an unstable-load training group or a stable-load training group.

Both groups completed the same supervised dynamic stability training program three times per week for 10 weeks, for a total of 30 training sessions. Each session lasted approximately 50 minutes. The exercise content, training frequency, session duration, set-repetition structure, rest intervals, vest mass, and any additional prescribed exercise loads were matched between groups. During the main training block, participants completed three sets of each exercise, with 12 repetitions per set during weeks 1-5 and 15 repetitions per set during weeks 6-10.

The unstable-load group trained while wearing an Aqua Vest containing a total external load of 5 kg, consisting of approximately 4 kg of water and a 1-kg vest. Because the water pouches were partially filled, the internal water could move during exercise and change the distribution of the external load. The stable-load group wore a mass-matched weighted vest containing approximately 4 kg of steel rods and a 1-kg vest. The steel rods were arranged to approximate the spatial distribution of the water pouches. Thus, the primary experimental difference between groups was the mobility of the external load rather than total vest mass or prescribed exercise content.

Assessments were conducted at baseline, after 5 weeks of training, and after 10 weeks of training. Dynamic postural control was evaluated using the Y-Balance Test. Participants completed reaching tasks in the anterior, posteromedial, and posterolateral directions while standing on one limb. The maximum valid reach distance in each direction was retained and normalized to limb length, and a composite score was also calculated.

Postural sway was evaluated during single-leg stance using force-platform-derived center-of-pressure measures under eyes-open and eyes-closed conditions. Eyes-open trials lasted 30 seconds and eyes-closed trials lasted 20 seconds. Center-of-pressure outcomes included total path distance and direction-specific root-mean-square displacement in the anteroposterior and mediolateral directions.

The broader study protocol also included lower-extremity physical-performance assessments. The registration record is intended to describe the original study protocol and design; individual publications arising from the study may focus on specific subsets of the collected outcomes.

The purpose of the comparison was to determine whether introducing load mobility through a water-filled vest, while keeping the prescribed exercise program and external mass closely matched, resulted in different adaptations from training with a stable weighted vest.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

30

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

      • Busan, Corea del Sud
        • Busan University of Foreign Studies

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto

Accetta volontari sani

Sì

Descrizione

Inclusion Criteria:

  • Female undergraduate students aged 19 to 25 years.
  • Generally healthy at the time of enrollment.
  • No surgery within the previous 6 months.
  • No congenital, neurological, vestibular, or musculoskeletal disorder affecting the foot, pelvis, or spine.
  • No participation in resistance training during the previous 12 months. Able and willing to participate in the 10-week supervised exercise intervention and study assessments.
  • Provided written informed consent to participate.

Exclusion Criteria:

  • Did not meet any of the inclusion criteria.
  • Participated in resistance training or functional training outside the study intervention during the 10-week study period.
  • Developed a health condition, injury, or other circumstance during the study that prevented safe participation in the prescribed exercise program or outcome assessments.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Altro
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Separare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Water-Inertia-Based Unstable-Load Training
Participants assigned to this arm completed a supervised 10-week dynamic stability training program three times per week while wearing an Aqua Vest with a total external load of 5 kg, consisting of approximately 4 kg of water and a 1-kg vest. The partially filled water pouches allowed internal water movement during exercise, creating a mobile external load. Exercise content, session duration, set-repetition structure, rest intervals, and any additional prescribed exercise loads were matched to the stable-load training arm.
Participants completed a supervised dynamic stability training program three times per week for 10 weeks (30 sessions), with each session lasting approximately 50 minutes. During training, participants wore a vest providing a total external load of 5 kg, consisting of approximately 4 kg of water in partially filled pouches and a 1-kg vest. Internal water movement allowed the external load distribution to change during exercise. Exercises were performed for three sets, with 12 repetitions per set during weeks 1-5 and 15 repetitions per set during weeks 6-10, with 30 seconds of rest between sets. Exercise content and any additional prescribed implement loads were matched to the stable-load intervention.
Altri nomi:
  • Unstable-Load Training (ULT)
  • Aqua Vest Training
Comparatore attivo: Stable-Load Training
Participants assigned to this arm completed the same supervised 10-week dynamic stability training program three times per week while wearing a mass-matched stable weighted vest with a total external load of 5 kg, consisting of approximately 4 kg of steel rods and a 1-kg vest. The steel rods were arranged to approximate the spatial loading configuration of the water pouches. Exercise content, session duration, set-repetition structure, rest intervals, and any additional prescribed exercise loads were matched to the unstable-load training arm.
Participants completed the same supervised dynamic stability training program three times per week for 10 weeks (30 sessions), with each session lasting approximately 50 minutes. During training, participants wore a stable weighted vest providing a total external load of 5 kg, consisting of approximately 4 kg of steel rods and a 1-kg vest. The steel rods were arranged to approximate the spatial loading configuration of the water pouches used in the water-inertia intervention. Exercises were performed for three sets, with 12 repetitions per set during weeks 1-5 and 15 repetitions per set during weeks 6-10, with 30 seconds of rest between sets. Exercise content and any additional prescribed implement loads were matched between groups.
Altri nomi:
  • Stable-Load Training (SLT)
  • Weighted Vest Training

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Normalized Anterior Reach Distance on the Y-Balance Test
Lasso di tempo: Baseline, Week 5, and Week 10
Dynamic postural control was assessed using the lower-quarter Y-Balance Test. Participants performed three valid anterior reach trials while maintaining single-leg stance. The maximum reach distance was retained and normalized to the corresponding limb length: normalized reach distance (%) = maximum reach distance / limb length × 100. Higher values indicate greater normalized reach performance.
Baseline, Week 5, and Week 10
Normalized Posteromedial Reach Distance on the Y-Balance Test
Lasso di tempo: Baseline, Week 5, and Week 10
Participants performed three valid posteromedial reach trials during the lower-quarter Y-Balance Test. The maximum reach distance was retained and normalized to the corresponding limb length: normalized reach distance (%) = maximum reach distance / limb length × 100. Higher values indicate greater normalized reach performance.
Baseline, Week 5, and Week 10
Normalized Posterolateral Reach Distance on the Y-Balance Test
Lasso di tempo: Baseline, Week 5, and Week 10
Participants performed three valid posterolateral reach trials during the lower-quarter Y-Balance Test. The maximum reach distance was retained and normalized to the corresponding limb length: normalized reach distance (%) = maximum reach distance / limb length × 100. Higher values indicate greater normalized reach performance.
Baseline, Week 5, and Week 10
Y-Balance Test Composite Score
Lasso di tempo: Baseline, Week 5, and Week 10
The composite score was calculated from the maximum valid anterior, posteromedial, and posterolateral reach distances normalized to limb length: composite score (%) = (maximum anterior + maximum posteromedial + maximum posterolateral reach distance) / (3 × limb length) × 100. Higher values indicate greater overall Y-Balance Test performance.
Baseline, Week 5, and Week 10
Center-of-Pressure Total Distance During Eyes-Open Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Postural sway was assessed using a force platform during 30-second eyes-open single-leg stance. Total CoP distance (cm) represented the cumulative path length of the center-of-pressure trajectory during each valid trial. Three trial-specific values were averaged for analysis. Lower values represent a shorter CoP trajectory during the test condition.
Baseline, Week 5, and Week 10
Anteroposterior CoP RMS During Eyes-Open Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Anteroposterior root-mean-square (AP RMS) displacement of the center of pressure was calculated during 30-second eyes-open single-leg stance and expressed in centimeters. AP RMS represents the dispersion of CoP displacement about its mean position in the anteroposterior direction. Three trial-specific values were averaged for analysis.
Baseline, Week 5, and Week 10
Mediolateral CoP RMS During Eyes-Open Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Mediolateral root-mean-square (ML RMS) displacement of the center of pressure was calculated during 30-second eyes-open single-leg stance and expressed in centimeters. ML RMS represents the dispersion of CoP displacement about its mean position in the mediolateral direction. Three trial-specific values were averaged for analysis.
Baseline, Week 5, and Week 10
Center-of-Pressure Total Distance During Eyes-Closed Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Postural sway was assessed using a force platform during 20-second eyes-closed single-leg stance. Total CoP distance (cm) represented the cumulative path length of the center-of-pressure trajectory during each valid trial. Three trial-specific values were averaged for analysis. Lower values represent a shorter CoP trajectory during the test condition.
Baseline, Week 5, and Week 10
Anteroposterior CoP RMS During Eyes-Closed Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Anteroposterior root-mean-square (AP RMS) displacement of the center of pressure was calculated during 20-second eyes-closed single-leg stance and expressed in centimeters. AP RMS represents the dispersion of CoP displacement about its mean position in the anteroposterior direction. Three trial-specific values were averaged for analysis.
Baseline, Week 5, and Week 10
Mediolateral CoP RMS During Eyes-Closed Single-Leg Stance
Lasso di tempo: Baseline, Week 5, and Week 10
Mediolateral root-mean-square (ML RMS) displacement of the center of pressure was calculated during 20-second eyes-closed single-leg stance and expressed in centimeters. ML RMS represents the dispersion of CoP displacement about its mean position in the mediolateral direction. Three trial-specific values were averaged for analysis.
Baseline, Week 5, and Week 10
Knee Extension Peak Torque Relative to Body Weight at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric knee extension strength was assessed using an isokinetic dynamometer at an angular velocity of 60°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater knee extensor torque relative to body weight.
Baseline, Week 5, and Week 10
Knee Flexion Peak Torque Relative to Body Weight at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric knee flexion strength was assessed using an isokinetic dynamometer at an angular velocity of 60°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater knee flexor torque relative to body weight.
Baseline, Week 5, and Week 10
Ankle Inversion Peak Torque Relative to Body Weight at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric ankle inversion strength was assessed using an isokinetic dynamometer at an angular velocity of 60°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater inversion torque relative to body weight.
Baseline, Week 5, and Week 10
Ankle Eversion Peak Torque Relative to Body Weight at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric ankle eversion strength was assessed using an isokinetic dynamometer at an angular velocity of 60°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater eversion torque relative to body weight.
Baseline, Week 5, and Week 10
Ankle Inversion Peak Torque Relative to Body Weight at 120°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric ankle inversion strength was assessed using an isokinetic dynamometer at an angular velocity of 120°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater inversion torque relative to body weight.
Baseline, Week 5, and Week 10
Ankle Eversion Peak Torque Relative to Body Weight at 120°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Concentric ankle eversion strength was assessed using an isokinetic dynamometer at an angular velocity of 120°/s. Peak torque was normalized to body weight and expressed as a percentage of body weight (PT/BW, %). Higher values indicate greater eversion torque relative to body weight.
Baseline, Week 5, and Week 10

Altre misure di risultato

Misura del risultato
Misura Descrizione
Lasso di tempo
Knee Extension Test Range of Motion at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the knee extension test performed at 60°/s, expressed in degrees. This measure represents the angular range recorded during the corresponding isokinetic testing condition.
Baseline, Week 5, and Week 10
Knee Flexion Test Range of Motion at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the knee flexion test performed at 60°/s, expressed in degrees.
Baseline, Week 5, and Week 10
Ankle Inversion Test Range of Motion at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the inversion test performed at 60°/s, expressed in degrees. This measure represents the angular range recorded during the corresponding isokinetic testing condition.
Baseline, Week 5, and Week 10
Ankle Eversion Test Range of Motion at 60°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the eversion test performed at 60°/s, expressed in degrees. This measure represents the angular range recorded during the corresponding isokinetic testing condition.
Baseline, Week 5, and Week 10
Ankle Inversion Test Range of Motion at 120°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the inversion test performed at 120°/s, expressed in degrees. This measure represents the angular range recorded during the corresponding isokinetic testing condition.
Baseline, Week 5, and Week 10
Ankle Eversion Test Range of Motion at 120°/s
Lasso di tempo: Baseline, Week 5, and Week 10
Range of motion recorded by the isokinetic dynamometer during the eversion test performed at 120°/s, expressed in degrees. This measure represents the angular range recorded during the corresponding isokinetic testing condition.
Baseline, Week 5, and Week 10

Collaboratori e investigatori

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Sponsor

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

5 luglio 2024

Completamento primario (Effettivo)

20 settembre 2024

Completamento dello studio (Effettivo)

20 settembre 2024

Date di iscrizione allo studio

Primo inviato

4 settembre 2026

Primo inviato che soddisfa i criteri di controllo qualità

4 settembre 2026

Primo Inserito (Effettivo)

10 settembre 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

14 settembre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

10 settembre 2026

Ultimo verificato

1 settembre 2026

Maggiori informazioni

Termini relativi a questo studio

Altri numeri di identificazione dello studio

  • 2024-0666-001
  • P01-202407-01-004 (Altro identificatore: Public Institutional Bioethics Committee, Republic of Korea)

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

SÌ

Descrizione del piano IPD

De-identified individual participant data that support the findings of the study may be shared with qualified researchers upon reasonable request, subject to applicable ethical and data-protection requirements.

Periodo di condivisione IPD

Beginning after publication of the primary study results, with no predetermined end date.

Criteri di accesso alla condivisione IPD

De-identified individual participant data may be shared with qualified researchers upon reasonable request for scientifically appropriate purposes. Requests should include a brief research proposal and planned analyses and will be reviewed for ethical, privacy, and data-protection considerations. Approved data will be provided by the study investigator.

Tipo di informazioni di supporto alla condivisione IPD

  • STUDIO_PROTOCOLLO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .