An interventional study of Flexi-Bar training with sitting posture and Flexi-Bar training with standing posture in Sedentary Adults, sponsored by Fooyin University. Recruiting at 1 site in Taiwan. Open to participants aged 18 Years to 25 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-13.
Sponsored by Fooyin University · Not applicable, Interventional, and Treatment
Trunk stability is a fundamental basis for achieving proximal stability and facilitating distal mobility, and is closely associated with balance control and neuromuscular coordination. This study aimed to investigate the effects of Flexi-Bar training performed in different postures on core muscle activation, trunk muscle strength, and balance in sedentary adults. The findings are expected to provide a preliminary foundation for future application in populations with impaired trunk control and poor balance, such as individuals with stroke.
This study will recruite 60 sedentary university students who were randomly assigned to an experimental group (sitting position) or a control group (standing position). The intervention consisted of standardized Flexi-Bar training twice a week, 35 minutes per session, for four weeks. Outcome measures included trunk muscle strength assessed using a handheld dynamometer (MicroFET3), core muscle activation assessed using surface electromyography (sEMG), and static and dynamic balance assessed using the TYMO balance platform and the Y-Balance Test, respectively.
Fooyin University is the lead sponsor of 18 studies on the registry; 5 are open to participants now.
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Exclusion Criteria:
Behavioral: Flexi-Bar training with sitting posture
Behavioral: Flexi-Bar training with standing posture
The intervention consisted of standardized Flexi-Bar training with sitting posture twice a week, 35 minutes per session, for four weeks.
The intervention consisted of standardized Flexi-Bar training with standing posture twice a week, 35 minutes per session, for four weeks.
Muscle strength (trunk flexors)
Muscle strength will be measured using a handheld dynamometer (MicroFET3; Hoggan Health Industries, Salt Lake City, UT, USA).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Muscle strength (trunk extensors)
Muscle strength will be measured using a handheld dynamometer (MicroFET3; Hoggan Health Industries, Salt Lake City, UT, USA).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Muscle strength (Trunk rotator muscles)
Muscle strength will be measured using a handheld dynamometer (MicroFET3; Hoggan Health Industries, Salt Lake City, UT, USA).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Muscle strength (Trunk lateral flexor muscles)
Muscle strength will be measured using a handheld dynamometer (MicroFET3; Hoggan Health Industries, Salt Lake City, UT, USA).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Static balance
Static balance was assessed using the TYMO balance platform to monitor center of pressure (COP) trajectory. Testing positions includes 4 conditions: 1. Standing with eyes open 2. Standing with eyes closed 3. Standing on a foam surface with eyes open 4. Standing on a foam with eyes closed. After each trial, the system automatically calculated the COP trajectory.
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Dynamic balance
Dynamic balance was assessed using the Limits of Stability (LOS) test to evaluate the ability to actively shift the center of mass. Participants will be instructed to maintain an upright posture without moving their feet and to shift their center of mass as far as possible in eight directions. After each trial, the system automatically calculated the dynamic balance score.
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
Y balance test
Participants performed a single-leg stance while reaching with the contralateral leg in three directions: anterior, posteromedial, and posterolateral. The maximum reach distance in each direction was recorded and normalized to leg length. A composite score was calculated to represent overall dynamic balance performance.
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
EMG activity (µV) of rectus abdominis during performing balance task
EMG activity (µV) of rectus abdominis during performing balance task will be recorded using the commercially wireless system (Delsys Inc., United States).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
EMG activity (µV) of external oblique during performing balance task
EMG activity (µV) of external oblique during performing balance task will be recorded using the commercially wireless system (Delsys Inc., United States).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
EMG activity (µV) of erector spinae
EMG activity (µV) of erector spinae during performing balance task will be recorded using the commercially wireless system (Delsys Inc., United States).
Time frame: 1. baseline, pre-intervention 2. immediately after the intervention
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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Fooyin University