Feasibility of Lower-Body EMS Resistance Training in Postmenopausal Women (LB-EMS-Pilot)
Feasibility and Effects of Lower-Body Electrical Muscle Stimulation Resistance Training on Body Composition, Muscle Function, Arteriosclerotic Indices, and Autonomic Function in Postmenopausal Women: A Pilot Randomized Controlled Trial
This pilot randomized controlled trial evaluates whether combining lower-body electrical muscle stimulation (EMS) with resistance training is feasible and beneficial for physically inactive postmenopausal women, who experience concurrent declines in muscle strength, body composition, arterial elasticity, and cardiac autonomic balance.
Sixteen physically inactive postmenopausal women aged 50-70 years are randomly assigned (1:1) to either (A) supervised resistance training combined with lower-body EMS (applied to 6 muscle groups: lower back, lower abdomen, glutes, quadriceps, hamstrings, and calves) or (B) supervised resistance training alone. Both groups complete twelve 50-minute sessions (consisting of a 10-minute warm-up, 30-minute main exercise, and a 10-minute cool-down) over 6 weeks (twice weekly). Assessments before and after the intervention include body composition, lower-body muscle function, arterial stiffness, and 5-minute heart rate variability.
The primary aim is to determine the feasibility of the protocol(recruitment, retention, session attendance, and intervention dose delivery) to inform a future definitive trial. Preliminary estimates of intervention effects on the measured outcomes are reported as secondary aims.
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
詳細な説明
BACKGROUND AND RATIONALE Postmenopausal women often experience physiological declines in muscle function, body composition, and cardiovascular health. While resistance training is an established countermeasure, maximizing its efficiency and adherence remains a challenge. Applying lower-body electrical muscle stimulation (EMS) during resistance training may enhance physiological adaptations and overall training effectiveness. This study aims to evaluate the feasibility of combining lower-body EMS with resistance training in physically inactive postmenopausal women to inform the design of a future definitive trial.
STUDY DESIGN This is a pilot randomized controlled trial. Participants will be randomly assigned to either an intervention group receiving combined lower-body EMS and resistance training or a control group receiving resistance training alone. Clinical and physiological outcomes will be assessed before and after the intervention period to evaluate preliminary effects.
PRIMARY FEASIBILITY OUTCOMES
The primary objective is to evaluate the feasibility of the study protocol. Feasibility will be determined by assessing several key components, including:
Recruitment: The ability to recruit the target population within the planned timeframe.
Retention: The proportion of participants who complete the study and post-intervention assessments.
Adherence: Participant attendance and compliance with the scheduled exercise sessions.
Intervention Fidelity: The successful delivery of the exercise intensity and EMS protocol as intended.
These components will be evaluated against pre-established progression criteria to determine whether the protocol can proceed to a larger trial or requires modification.
STATISTICAL APPROACH Feasibility outcomes will be summarized primarily using descriptive statistics. For secondary physiological and clinical outcomes, appropriate statistical methods will be utilized to estimate the preliminary effects of the intervention, comparing changes between the groups while adjusting for baseline measurements. Effect sizes and confidence intervals will be calculated to provide preliminary evidence and to assist with sample size calculations for future large-scale trials.
研究の種類
研究の種類
入学 (実際)
入学
段階
段階
- 適用できない
連絡先と場所
研究連絡先
研究連絡先
- 名前：Kyungho Kim, MS
- 電話番号：82 + 010-3589-8202
- メール：2007kkh@gmail.com
研究場所
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Seoul
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Seoul、Seoul、韓国、08826
- Seoul National University
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-
参加基準
適格基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
説明
Inclusion Criteria:
- Women aged 50 to 70 years.
- Menopause for at least 1 year with no current menstruation.
- Physically inactive (have not participated in resistance training more than twice a week for the past 6 months)
Exclusion Criteria:
- Currently receiving hormone replacement therapy (HRT).
- Presence of implanted electrical medical devices.
- Severe or uncontrolled medical conditions.
- Any surgery within the past 6 months.
- Acute illness with fever, infection, or active inflammation.
- Severe peripheral arterial disease or abdominal/inguinal hernia.
- Severe psychiatric disorders requiring medication, or current substance abuse.
- Deemed physically or mentally unfit to participate in the exercise program by the investigator.
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：他の
- 割り当て：ランダム化
- 介入モデル：並列代入
- マスキング：独身
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
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実験的：A Group: EMS + Resistance Training
Lower-body EMS combined with 8 machine-based resistance exercises for 6 weeks, 2 sessions per week.
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Electrical muscle stimulation (85 Hz, 350 μs, cycle 11, duty approx 1:2) applied to 6 muscle groups: lower back (erector spinae), lower abdomen, glutes, quadriceps, hamstrings, and calves.
A 50-minute session consisting of a 10-minute warm-up, 30 minutes of main exercise (8 machine-based lower-body resistance exercises, 3 sets of 8-12 repetitions), and a 10-minute cool-down.
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アクティブコンパレータ：B Group: Resistance Training
8 machine-based resistance exercises for 6 weeks, 2 sessions per week without EMS.
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A 50-minute session consisting of a 10-minute warm-up, 30 minutes of main exercise (8 machine-based lower-body resistance exercises, 3 sets of 8-12 repetitions), and a 10-minute cool-down.
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この研究は何を測定していますか？
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Composite Feasibility Outcome (Recruitment, Retention, Session Attendance, and Intervention Dose Delivery)
時間枠：Baseline and Week 6
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The primary outcome is the feasibility of the study protocol, assessed via recruitment rates, participant retention, session adherence, and targeted intervention delivery. These indicators will be evaluated against pre-defined progression criteria using descriptive statistics to determine whether to proceed with or modify the protocol for a future definitive trial. Unit: Percentage |
Baseline and Week 6
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二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Skeletal Muscle Mass Index (SMI)
時間枠：Baseline and Week 6
|
Appendicular skeletal muscle mass divided by height squared.
Unit: kg/m².
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Baseline and Week 6
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Total Body Muscle Mass
時間枠：Baseline and Week 6
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Total skeletal muscle mass of the whole body.
Unit: kg
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Baseline and Week 6
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Total Leg Muscle Mass
時間枠：Baseline and Week 6
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Combined left and right leg skeletal muscle mass.
Unit: kg
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Baseline and Week 6
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Body Fat Percentage
時間枠：Baseline and Week 6
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Body fat mass expressed as a percentage of total body weight.
Unit: %
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Baseline and Week 6
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Total Body Fat Mass
時間枠：Baseline and Week 6
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Absolute total body fat in kilograms.
Unit: kg
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Baseline and Week 6
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Estimated Visceral Fat Area (eVFA)
時間枠：Baseline and Week 6
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Estimated visceral fat area at the umbilical level.
Unit: cm²
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Baseline and Week 6
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Waist Circumference
時間枠：Baseline and Week 6
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Circumference measured at the level of the umbilicus.
Unit: cm
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Baseline and Week 6
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Waist-to-Hip Ratio (WHR)
時間枠：Baseline and Week 6
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Waist circumference divided by hip circumference.
Unit: ratio
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Baseline and Week 6
|
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Body Mass Index (BMI)
時間枠：Baseline and Week 6
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Body weight in kilograms divided by the square of height in meters.
Unit: kg/m²
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Baseline and Week 6
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Phase Angle
時間枠：Baseline and Week 6
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Whole-body bioimpedance phase angle derived from the arctangent of the reactance-to-resistance ratio. Marker of cellular membrane integrity and overall nutritional/health status. Unit: degrees |
Baseline and Week 6
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Dominant Knee Extensor Peak Torque per Body Weight at 60°/s
時間枠：Baseline and Week 6
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Peak concentric knee extensor torque normalized to body weight, measured at 60°/sec angular velocity on the dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Non-dominant Knee Extensor Peak Torque per Body Weight at 60°/s
時間枠：Baseline and Week 6
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Peak concentric knee extensor torque normalized to body weight at 60°/sec on the non-dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Dominant Knee Flexor Peak Torque per Body Weight at 60°/s
時間枠：Baseline and Week 6
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Peak concentric knee flexor (hamstring) torque normalized to body weight at 60°/sec on the dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Non-dominant Knee Flexor Peak Torque per Body Weight at 60°/s
時間枠：Baseline and Week 6
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Peak concentric knee flexor torque normalized to body weight at 60°/sec on the non-dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Dominant Hamstring-to-Quadriceps (H/Q) Ratio at 60°/s
時間枠：Baseline and Week 6
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Ratio of knee flexor peak torque to knee extensor peak torque at 60°/sec on the dominant limb. Unit: ratio |
Baseline and Week 6
|
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Non-dominant Hamstring-to-Quadriceps (H/Q) Ratio at 60°/s
時間枠：Baseline and Week 6
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Ratio of knee flexor peak torque to knee extensor peak torque at 60°/sec on the non-dominant limb. Unit: ratio |
Baseline and Week 6
|
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Dominant Total Work Done by Knee Extensor per Body Weight at 180°/s
時間枠：Baseline and Week 6
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Total work performed by knee extensors across the test set, normalized to body weight, at 180°/sec angular velocity on the dominant limb. Unit: Nm/kg |
Baseline and Week 6
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Non-dominant Total Work Done by Knee Extensor per Body Weight at 180°/s
時間枠：Baseline and Week 6
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Total work performed by knee extensors normalized to body weight at 180°/sec on the non-dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Dominant Total Work Done by Knee Flexor per Body Weight at 180°/s
時間枠：Baseline and Week 6
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Total work performed by knee flexors normalized to body weight at 180°/sec on the dominant limb. Unit: Nm/kg |
Baseline and Week 6
|
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Non-dominant Total Work Done by Knee Flexor per Body Weight at 180°/s
時間枠：Baseline and Week 6
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Total work performed by knee flexors normalized to body weight at 180°/sec on the non-dominant limb. Unit: Nm/kg |
Baseline and Week 6
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Average Brachial-Ankle Pulse Wave Velocity (baPWV)
時間枠：Baseline and Week 6
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Mean of left and right brachial-ankle pulse wave velocity; primary indicator of large-artery stiffness. Unit: cm/s |
Baseline and Week 6
|
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Highest Brachial-Ankle Pulse Wave Velocity (baPWV)
時間枠：Baseline and Week 6
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The higher of left and right baPWV values, reflecting the most affected limb.
Unit: cm/s
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Baseline and Week 6
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Brachial Systolic Blood Pressure (SBP)
時間枠：Baseline and Week 6
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Brachial systolic blood pressure.
Unit: mmHg
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Baseline and Week 6
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Brachial Diastolic Blood Pressure (DBP)
時間枠：Baseline and Week 6
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Brachial diastolic blood pressure.
Unit: mmHg
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Baseline and Week 6
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Pulse Pressure (PP)
時間枠：Baseline and Week 6
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Pulse pressure calculated as systolic minus diastolic blood pressure.
Unit: mmHg
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Baseline and Week 6
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Mean Arterial Pressure (MAP)
時間枠：Baseline and Week 6
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Mean arterial pressure derived from systolic and diastolic blood pressure.
Unit: mmHg
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Baseline and Week 6
|
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Average Ankle-Brachial Index (ABI)
時間枠：Baseline and Week 6
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Mean of left and right ankle-brachial systolic blood pressure ratio.
Unit: ratio
|
Baseline and Week 6
|
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Augmentation Index (AI)
時間枠：Baseline and Week 6
|
Augmentation index derived from second-derivative photoplethysmography. Unit: unitless
|
Baseline and Week 6
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Root Mean Square of Successive Differences (RMSSD)
時間枠：Baseline and Week 6
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Root mean square of successive differences between adjacent normal-to-normal RR intervals. Unit: ms |
Baseline and Week 6
|
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High-Frequency (HF) Power
時間枠：Baseline and Week 6
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Spectral power in the high-frequency band (0.15-0.4 Hz); index of parasympathetic (vagal) activity. Unit: ms² |
Baseline and Week 6
|
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Standard Deviation of NN Intervals (SDNN)
時間枠：Baseline and Week 6
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Standard deviation of all normal-to-normal RR intervals; time-domain index of overall heart rate variability. Unit: ms |
Baseline and Week 6
|
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Low-Frequency (LF) Power
時間枠：Baseline and Week 6
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Spectral power in the low-frequency band (0.04-0.15 Hz).
Unit: ms²
|
Baseline and Week 6
|
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LF/HF Ratio
時間枠：Baseline and Week 6
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Ratio of low-frequency to high-frequency spectral power.
Unit: ratio
|
Baseline and Week 6
|
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High-Frequency Normalized Units (HFnu)
時間枠：Baseline and Week 6
|
HF power expressed in normalized units = HF / (LF + HF) × 100.
Unit: n.u.
|
Baseline and Week 6
|
|
Low-Frequency Normalized Units (LFnu)
時間枠：Baseline and Week 6
|
LF power expressed in normalized units = LF / (LF + HF) × 100.
Unit: n.u.
|
Baseline and Week 6
|
|
Total Power (TP)
時間枠：Baseline and Week 6
|
Total spectral power up to 0.4 Hz.
Unit: ms²
|
Baseline and Week 6
|
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Very-Low-Frequency (VLF) Power
時間枠：Baseline and Week 6
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Spectral power in the very-low-frequency band (≤0.04 Hz).
Unit: ms²
|
Baseline and Week 6
|
その他の成果指標
その他の成果指標
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Dominant Knee Extensor Fatigue Index at 180°/s
時間枠：Baseline and Week 6
|
Percentage decline in knee extensor torque across the repetition set at 180°/sec on the dominant limb. Unit: % |
Baseline and Week 6
|
|
Non-dominant Knee Extensor Fatigue Index at 180°/s
時間枠：Baseline and Week 6
|
Percentage decline in knee extensor torque across the repetition set at 180°/sec on the non-dominant limb. Unit: % |
Baseline and Week 6
|
|
Dominant Knee Flexor Fatigue Index at 180°/s
時間枠：Baseline and Week 6
|
Percentage decline in knee flexor torque across the repetition set at 180°/sec on the dominant limb. Unit: %. |
Baseline and Week 6
|
|
Non-dominant Knee Flexor Fatigue Index at 180°/s
時間枠：Baseline and Week 6
|
Percentage decline in knee flexor torque across the repetition set at 180°/sec on the non-dominant limb. Unit: % |
Baseline and Week 6
|
|
Bilateral Deficit of Knee Extensors at 60°/s
時間枠：Baseline and Week 6
|
Percentage asymmetry of knee extensor peak torque between dominant and non-dominant limbs at 60°/sec. Unit: % |
Baseline and Week 6
|
|
Bilateral Deficit of Knee Flexors at 60°/s
時間枠：Baseline and Week 6
|
Percentage asymmetry of knee flexor peak torque between dominant and non-dominant limbs at 60°/sec. Unit: % |
Baseline and Week 6
|
|
Dominant Total Work Done H/Q Ratio at 180°/s
時間枠：Baseline and Week 6
|
Ratio of knee flexor to knee extensor total work done at 180°/sec on the dominant limb. Unit: ratio |
Baseline and Week 6
|
|
Non-dominant Total Work Done H/Q Ratio at 180°/s
時間枠：Baseline and Week 6
|
Ratio of knee flexor to knee extensor total work done at 180°/sec on the non-dominant limb. Unit: ratio |
Baseline and Week 6
|
|
Arterial Elasticity (AE)
時間枠：Baseline and Week 6
|
Arterial elasticity index derived from second-derivative photoplethysmography. Unit: unitless
|
Baseline and Week 6
|
|
Peripheral Elasticity (PE)
時間枠：Baseline and Week 6
|
Peripheral elasticity index derived from second-derivative photoplethysmography. Unit: unitless. |
Baseline and Week 6
|
協力者と研究者
捜査官
捜査官
- 主任研究者：Yeon Soo Kim, MD, Prof、Seoul National University
研究記録日
主要日程の研究
研究開始 (実際)
研究開始
一次修了 (実際)
一次修了
研究の完了 (実際)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
本研究に関する用語
追加の関連 MeSH 用語
その他の研究ID番号
その他の研究ID番号
- SNU 26-02-085
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
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米国FDA規制医薬品の研究
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