title: Age-related site-specific muscle loss in the thigh and zigzag walking performance in older men and women.
abstract: To investigate the relationships between site-specific muscle loss in the thigh, muscle quality and zigzag walking performance, 40 men and 41 women aged 65-79 years had muscle thickness (MTH) measured by ultrasound at nine sites on the anterior and posterior aspects of the body. Skeletal muscle mass (SM) was estimated from an ultrasound-derived prediction equation. Site-specific thigh sarcopenia was calculated using ultrasound-measured MTH at the anterior/posterior aspects of the thigh (AP-MTH ratio). Zigzag walking time (ZWT) and maximum isometric knee extension (KE) and flexion (KF) torques were measured. Muscle quality (torque/thigh SM) and knee joint strength index (torque/body mass) were calculated. There were no significant correlations between SM index and ZWT. However, AP-MTH ratio was inversely correlated (P < 0.05) to ZWT in men (r = -0.335) and women (r = -0.309). ZWT was also inversely correlated (P < 0.05) to KE-strength index in both sexes (men, r = -0.328; women, r = -0.372). Similarly, ZWT was correlated to KF-strength index (r = -0.497) and muscle quality (r = -0.322) in women, but not in men. After adjusting for age, height and body mass, AP-MTH ratio was inversely correlated to ZWT in men (r = -0.325) and tended to be correlated to ZWT in women (r = -0.263). Zigzag walking performance may be associated with site-specific thigh sarcopenia in older men and women.
authors.affiliation: Indiana University Department of Kinesiology, School of Public Health 1025 East 7th Street, Room 104 Bloomington IN 47405 USA Toyo Gakuen University Active Aging Research Center Nagareyama, Chiba Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Abe
authors.affiliation: University of Oklahoma Department of Health and Exercise Science Norman OK USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Loenneke
authors.affiliation: University of Oklahoma Department of Health and Exercise Science Norman OK USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Thiebaud
authors.affiliation: Toyo Gakuen University Active Aging Research Center Nagareyama, Chiba Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ogawa
authors.affiliation: Toyo Gakuen University Active Aging Research Center Nagareyama, Chiba Japan.
authors.forename: N
authors.initials: N
authors.lastname: Mitsukawa
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging; D001696:Biomechanical Phenomena; D001823:Body Composition; D005260:Female; D005684:Gait; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D008297:Male; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000503:physiopathology*; D055948:Sarcopenia / Q000000981:diagnostic imaging / Q000503:physiopathology*; D013848:Thigh; D019415:Torque; D014463:Ultrasonography; D016138:Walking
keywords: aging; gait; muscle strength; skeletal muscle mass; ultrasound