Document Detail


Highly demanding resistive vibration exercise program is tolerated during 56 days of strict bed-rest.
MedLine Citation:
PMID:  16802251     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Several studies have tried to find countermeasures against musculoskeletal de-conditioning during bed-rest, but none of them yielded decisive results. We hypothesised that resistive vibration exercise (RVE) might be a suitable training modality. We have therefore carried out a bed-rest study to evaluate its feasibility and efficacy during 56 days of bed-rest. Twenty healthy male volunteers aged 24 to 43 years were recruited and, after medical check-ups, randomised to a non-exercising control (Ctrl) group or a group that performed RVE 11 times per week. Strict bed-rest was controlled by video surveillance. The diet was controlled. RVE was performed in supine position, with a static force component of about twice the body weight and a smaller dynamic force component. RVE comprised four different units (squats, heel raises, toe raises, kicks), each of which lasted 60 - 100 seconds. Pre and post exercise levels of lactate were measured once weekly. Body weight was measured daily on a bed scale. Pain questionnaires were obtained in regular intervals during and after the bed-rest. Vibration frequency was set to 19 Hz at the beginning and progressed to 25.9 Hz (SD 1.9) at the end of the study, suggesting that the dynamic force component increased by 90 %. The maximum sustainable exercise time for squat exercise increased from 86 s (SD 21) on day 11 of the BR to 176 s (SD 73) on day 53 (p = 0.006). On the same days, post-exercise lactate levels increased from 6.9 mmol/l (SD2.3) to 9.2 mmol/l (SD 3.5, p = 0.01). On average, body weight was unchanged in both groups during bed-rest, but single individuals in both groups depicted significant weight changes ranging from - 10 % to + 10 % (p < 0.001). Lower limb pain was more frequent during bed-rest in the RVE subjects than in Ctrl (p = 0.035). During early recovery, subjects of both groups suffered from muscle pain to a comparable extent, but foot pain was more common in Ctrl than in RVE (p = 0.013 for plantar pain, p = 0.074 for dorsal foot pain). Our results indicate that RVE is feasible twice daily during bed-rest in young healthy males, provided that one afternoon and one entire day per week are free. Exercise progression, mainly by progression of vibration frequency, yielded increases in maximum sustainable exercise time and blood lactate. In conclusion, RVE as performed in this study, appears to be safe.
Authors:
J Rittweger; D Belavy; P Hunek; U Gast; H Boerst; B Feilcke; G Armbrecht; E Mulder; H Schubert; C Richardson; A de Haan; D F Stegeman; H Schiessl; D Felsenberg
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  27     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-27     Completed Date:  2006-11-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  553-9     Citation Subset:  IM    
Affiliation:
Centre for Muscle and Bone Research, Charité-Campus Benjamin Franklin, Berlin, Germany. j.rittweger@mmu.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adult
Bed Rest*
Exercise Therapy / methods*
Humans
Lactates / blood
Logistic Models
Male
Muscular Atrophy / prevention & control*
Pain Measurement
Supine Position
Vibration / therapeutic use*
Chemical
Reg. No./Substance:
0/Lactates

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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