Phase I, this study aims to:- 1. Establish intra- and inter-rater reliability and minimal detectable change of ultrasound imaging measurement 2. Determine appropriate mode and dose for neuromuscular electrical stimulation on lumbar multifidus muscle 3. Determine feasibility of proposed protocol and physical therapy intervention Phase II, this study aims to:- 1. Determine the difference lumbar multifidus muscle activation based on arthrogenic muscle inhibition model between individuals with and without impaired lumbopelvic control 2. Determine the effect of combined neuromuscular electrical stimulation and motor control training in individual with impaired lumbopelvic control
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Muscle thickness of lumbar multifidus muscle at baseline.
Timeframe: This outcome will be collected at baseline.
Muscle thickness of lumbar multifidus muscle after the first intervention.
Timeframe: This outcome will be collected at immediately after the first intervention.
Muscle thickness of lumbar multifidus muscle after 8-week intervention.
Timeframe: This outcome will be collected at immediately after 8-week intervention.
Cross-sectional area of lumbar multifidus muscle at baseline.
Timeframe: This outcome will be collected at baseline.
Cross-sectional area of lumbar multifidus muscle after the first intervention.
Timeframe: This outcome will be collected at immediately after the first intervention.
Cross-sectional area of lumbar multifidus muscle after 8-week intervention.
Timeframe: This outcome will be collected at immediately after 8-week intervention.
Pennation angle of lumbar multifidus muscle at baseline.
Timeframe: This outcome will be collected at baseline.
Pennation angle of lumbar multifidus muscle after the first intervention.
Timeframe: This outcome will be collected at immediately after the first intervention.
Pennation angle of lumbar multifidus muscle after 8-week intervention.
Timeframe: This outcome will be collected at immediately after 8-week intervention.