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Physiologic Alterations and Predictors of Performance in a 160-km Ultramarathon.
MedLine Citation:
PMID:  22266743     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: To describe physiologic alterations in runners competing in a 160-km endurance event and to evaluate the utility of weight and blood pressure measurements in the assessment of runner performance. DESIGN: Prospective cohort study. SETTING: 160-km ultramarathon. PARTICIPANTS: Ninety-one of the 101 participants in the 2010 Tahoe Rim 100 Mile Endurance Run. ASSESSMENT OF RISK FACTORS: Brachial blood pressure, heart rate, and weight were assessed before competition, at 80 km, and at 160 km. MAIN OUTCOME MEASURES: Alterations in brachial blood pressure, heart rate, and weight were assessed in finishers. Weight loss, brachial blood pressure, pulse pressure, and heart rate at 80 km were assessed in all participants for their ability to predict failure to finish the race. RESULTS: Participants who finished 160 km (57%) experienced their fastest heart rates (P < 0.05), lowest systolic pressures (P < 0.05), highest diastolic pressures (P < 0.05), narrowest pulse pressures (P < 0.05), and lowest weights (P < 0.05) at 80 km. High rates of finishing were seen in those who lost >5% of their prerace weight (87%). Categorical weight loss (<3%, 3%-5%, and >5%) was not associated with the ability to finish (P > 0.05) or finishing time (P > 0.05), whereas the presence of a narrow pulse pressure was associated with a high likelihood (likelihood ratio = 9.84; P = 0.002) of failure to finish. CONCLUSIONS: Greater intracompetition weight loss is not associated with impaired performance but rather may be an aspect of superior performance. Narrow pulse pressure was associated with a high likelihood of failure to finish.
Authors:
Zachary C Landman; Geri O Landman; Pedram Fatehi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-19
Journal Detail:
Title:  Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine     Volume:  -     ISSN:  1536-3724     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9103300     Medline TA:  Clin J Sport Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
*Department of Medicine †Division of Nephrology, University of California, San Francisco, San Francisco, California.
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