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Effects of Flexi-Bar Training in Different Postures on Core Muscle Activation, Trunk Muscle Strength, and Balance in Sedentary Adults

Sponsor: Fooyin University • ClinicalTrials.gov ID: NCT07872566

Registry updated: 2026-10-13

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Description

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.

Interventions

Flexi-Bar training with sitting posture (Behavioral)
The intervention consisted of standardized Flexi-Bar training with sitting posture twice a week, 35 minutes per session, for four weeks.
Flexi-Bar training with standing posture (Behavioral)
The intervention consisted of standardized Flexi-Bar training with standing posture twice a week, 35 minutes per session, for four weeks.

Eligibility criteria

Inclusion Criteria: 1. Aged 18-25 years and currently enrolled as university students. 2. Classified as having a low level of physical activity based on the International Physical Activity Questionnaire (IPAQ), with a total physical activity level of \<600 MET-min/week. 3. Reported a daily sitting time of ≥6 hours. 4. Did not participate in any other core stability or balance training during the study period. 5. Had no known neurological disorders, such as stroke, traumatic brain injury, or Parkinson's disease. 6. Had no musculoskeletal injuries involving the lower extremities or spine within the previous 6 months. Exclusion Criteria: 1. Develop discomfort, pain, or other safety concerns during the study period and are assessed by the research team as being unsuitable for continued participation. 2. Are unable to fully comply with or complete the study intervention or assessment procedures.

Conditions

Sedentary Adults

Locations

Fooyin University — Kaohsiung City, Daliao Dist., Taiwan

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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

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