title: Relative appendicular skeletal muscle mass is associated with isokinetic muscle strength and balance in healthy collegiate men.
abstract: There are few studies on the relationship between skeletal muscle mass and balance in the young ages. We investigated the relationship between appendicular skeletal muscle mass, isokinetic muscle strength of lower extremity, and balance among healthy young men using relative skeletal muscle index. Thirty men were grouped according to relative appendicular skeletal muscle mass index: higher skeletal muscle group (n = 15) and lower skeletal muscle group (n = 15). Static and dynamic balance abilities were measured using the following: a test where participants stood on one leg with eyes closed, a modified Clinical Test of Sensory Interaction on Balance (mCTSIB) with eyes open and eyes closed, a stability test, and limits of stability test. The muscle strength of lower extremities was measured with an isokinetic analyser in hip, knee, and ankle joints. Participants with higher appendicular skeletal muscle mass were significantly more stable in maintaining dynamic balance than those with lower appendicular skeletal muscle mass. Moreover, appendicular skeletal muscle mass index was positively correlated with dynamic balance ability. Participants with higher appendicular skeletal muscle mass had stronger strength in the lower extremity, and there were significant differences in the isokinetic torque ratios between groups. From these results, it can be inferred that higher appendicular skeletal muscle mass relates to muscle strength and the alteration in the peak torque ratio of the lower extremity, contributing to the maintenance of balance.
authors.affiliation: a Department of Physiology , College of Medicine, Kyung Hee University , Seoul , Republic of Korea.
authors.forename: Sung-Eun
authors.initials: SE
authors.lastname: Kim
authors.affiliation: b Department of Exercise Physiology and Prescription, Graduate School of Health Promotion , Hanseo University , Seosan , Republic of Korea.
authors.forename: Ju
authors.initials: J
authors.lastname: Hong
authors.affiliation: c Department of Physical Education , Graduate School of Chungnam National University , Daejeon , Republic of Korea.
authors.forename: Jun-Youl
authors.initials: JY
authors.lastname: Cha
authors.affiliation: c Department of Physical Education , Graduate School of Chungnam National University , Daejeon , Republic of Korea.
authors.forename: Jung-Min
authors.initials: JM
authors.lastname: Park
authors.affiliation: b Department of Exercise Physiology and Prescription, Graduate School of Health Promotion , Hanseo University , Seosan , Republic of Korea.
authors.forename: Denny
authors.initials: D
authors.lastname: Eun
authors.affiliation: d Department of Health Management , Sahmyook University , Seoul , Republic of Korea.
authors.forename: Jaehyun
authors.initials: J
authors.lastname: Yoo
authors.affiliation: b Department of Exercise Physiology and Prescription, Graduate School of Health Promotion , Hanseo University , Seosan , Republic of Korea.
authors.forename: Yong-Seok
authors.initials: YS
authors.lastname: Jee
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D006801:Humans; D035002:Lower Extremity; D008297:Male; D009068:Movement; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000033:anatomy & histology* / Q000502:physiology; D009929:Organ Size; D010809:Physical Fitness; D004856:Postural Balance; D012016:Reference Values; D019415:Torque; D055815:Young Adult
keywords: Appendicular skeletal muscle index; balance ability; isokinetic muscle strength of lower extremity