Intermittent whole-body vibration attenuates a reduction in the number of the capillaries in unloaded rat skeletal muscle
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  • 作者:Akinori Kaneguchi ; Junya Ozawa ; Seiichi Kawamata…
  • 关键词:Hindlimb suspension ; Skeletal muscle ; Capillary ; Angiogenic factor ; Muscle atrophy ; Whole ; body vibration ; Weight bearing
  • 刊名:BMC Musculoskeletal Disorders
  • 出版年:2014
  • 出版时间:December 2014
  • 年:2014
  • 卷:15
  • 期:1
  • 全文大小:786 KB
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  • 刊物主题:Orthopedics; Rehabilitation; Rheumatology; Sports Medicine; Internal Medicine;
  • 出版者:BioMed Central
  • ISSN:1471-2474
文摘
Background Whole-body vibration has been suggested for the prevention of muscle mass loss and muscle wasting as an attractive measure for disuse atrophy. This study examined the effects of daily intermittent whole-body vibration and weight bearing during hindlimb suspension on capillary number and muscle atrophy in rat skeletal muscles. Methods Sixty male Wistar rats were randomly divided into four groups: control (CONT), hindlimb suspension (HS), HS-?weight bearing (WB), and HS-?whole-body vibration (VIB) (n--5 each). Hindlimb suspension was applied for 2?weeks in HS, HS-?WB, and HS-?VIB groups. During suspension, rats in HS-?VIB group were placed daily on a vibrating whole-body vibration platform for 20?min. In HS-?WB group, suspension was interrupted for 20?min/day, allowing weight bearing. Untreated rats were used as controls. Results Soleus muscle wet weights and muscle fiber cross-sectional areas (CSA) significantly decreased in HS, HS-?WB, and HS-?VIB groups compared with CONT group. Both muscle weights and CSA were significantly greater in HS-?WB and HS-?VIB groups compared with HS group. Capillary numbers (represented by capillary-to-muscle fiber ratio) were significantly smaller in all hindlimb suspension-treated groups compared with CONT group. However, a reduction in capillary number by unloading hindlimbs was partially prevented by whole-body vibration. These findings were supported by examining mRNA for angiogenic-related factors. Expression levels of a pro-angiogenic factor, vascular endothelial growth factor-A mRNA, were significantly lower in all hindlimb suspension-treated groups compared with CONT group. There were no differences among hindlimb suspension-treated groups. Expression levels of an anti-angiogenic factor, CD36 (receptor for thrombospondin-1) mRNA, were significantly higher in all hindlimb suspension-treated groups compared with CONT group. Among the hindlimb suspension-treated groups, expression of CD36 mRNA in HS-?VIB group tended to be suppressed (less than half the HS group). Conclusions Our results suggest that weight bearing with or without vibration is effective for disuse-derived disturbance by preventing muscle atrophy, and whole-body vibration exercise has an additional benefit of maintaining microcirculation of skeletal muscle.

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