title: Asynchronous Alterations of Muscle Force and Tendon Stiffness Following 8 Weeks of Resistance Exercise with Whole-Body Vibration in Older Women.
abstract: This study aimed to examine whether muscle force and tendon stiffness in a muscle-tendon complex alter synchronously following 8-week whole-body vibration (WBV) training in older people. Forty older women aged 65 years and older were randomly assigned into control (CON, n = 15) and whole-body vibration (WBV) training groups (exposure time, n = 13; vibration intensity, n = 12). For the training groups, a 4-week detraining period was completed following the training period. Throughout the training/detraining period, force of the medial gastrocnemius (MG) muscle and stiffness of the Achilles tendon were assessed four times (0, 4, 8, and 12 weeks) using a combined system of dynamometer and ultrasonography. While muscle force gradually increased throughout the training period (p < .05), a significant increase in tendon stiffness was observed after 8 weeks (p < .05). These findings indicated that, during the early phase of WBV training, muscle force and tendon stiffness changed asynchronously, which might be a factor in possible musculotendinous injuries.
authors: Seong-Won
authors: SW
authors: Han
authors: Dae-Yeon
authors: DY
authors: Lee
authors: Dong-Sung
authors: DS
authors: Choi
authors: Boram
authors: B
authors: Han
authors: Jin-Sun
authors: JS
authors: Kim
authors: Hae-Dong
authors: HD
authors: Lee
mesh_terms: D000125:Achilles Tendon / Q000000981:diagnostic imaging / Q000502:physiology*; D000368:Aged; D004576:Electromyography; D005260:Female; D006801:Humans; D053580:Muscle Strength / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014732:Vibration / Q000627:therapeutic use*
keywords: aging; muscle force; tendon stiffness; whole-body vibration exercise