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Effect of Recovery Duration between Two Bouts of Running on Bone Metabolism.
MedLine Citation:
PMID:  23034642     Owner:  NLM     Status:  Publisher    
PURPOSE: Strenuous, endurance exercise increases biochemical markers of bone resorption but not formation, although the effect of recovery duration between consecutive bouts of exercise is unknown. We examined the effect of recovery duration on the bone metabolic response to two bouts of running. METHODS: Ten physically-active men completed two, 9-d trials. On days 4 and 5, participants completed two, 60 min bouts of running at 65% VO2max separated by either a 23 h (LONG) or 3 h (SHORT) recovery period. Osteoprotegerin (OPG), parathyroid hormone (PTH), albumin-adjusted calcium (ACa), and phosphate (PO4) were measured from blood samples obtained before and for 3 h after exercise, and on four follow-up days (days 6-9). Markers of bone resorption [C-terminal telopeptide region of collagen type 1 (β-CTX)] and bone formation [N-terminal propeptides of procollagen type 1 (P1NP) and bone alkaline phosphatase (bone ALP)] were measured in early morning, fasted samples on days 4 to 9. RESULTS: There were no significant changes in β-CTX, P1NP or bone ALP with either protocol. OPG, PTH, ACa and PO4 concentrations increased with all exercise bouts but the response to the second bout was not altered by recovery duration. CONCLUSION: Two, 60 min bouts of running at 65% VO2max separated by either 23 h or 3 h had no effect on markers of bone resorption or formation from 1 to 4 days postexercise. Reducing recovery duration from 23 h to 3 h between two bouts of running did not alter the increase in OPG, PTH, ACa and PO4 to the second bout.
Jonathan P R Scott; Craig Sale; Julie P Greeves; Anna Casey; John Dutton; William D Fraser
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-2
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Human Sciences, QinetiQ Ltd., Farnborough, UK; 2Biomedical, Life and Health Sciences Research Centre, School of Science and Technology, Nottingham Trent University, UK; 3Department of Occupational Medicine, HQ Army Recruiting and Training Division, Upavon, UK; 4Department of Musculoskeletal Biology, University of Liverpool; 5Norwich Medical School, University of East Anglia UK.
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