Document Detail


Nutritional, Physiological and Perceptual Responses During a Summer Ultra-Endurance Cycling Event.
MedLine Citation:
PMID:  22105054     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Despite the rapid growth of mass-participation road cycling, little is known about the dietary, metabolic and behavioral responses of ultra-endurance cyclists. This investigation describes physiological responses, perceptual ratings, energy balance, and macronutrient intake of 42 men (mean ± SD; age, 38±6 y; height, 179.7±7.1 cm; body mass, 85.85±14.79 kg) and 6 women (age, 41±4 y; height, 168.0±2.9 cm; body mass, 67.32±7.21 kg) during a summer 164-km road cycling event. Measurements were recorded one day before, and on Event Day (10.5 h) at the start (0 km), at two aid stations (52 km and 97 km), and at the finish line (164 km). Ambient temperature was >39.0°C during the final 2 h of exercise. Mean finish times for men (9.1±1.2 h) and women (9.0±0.2 h) were similar, as were mean gastrointestinal temperature [TGI], four hydration biomarkers, and five perceptual (e.g., thermal, thirst, pain) ratings. Male cyclists consumed enough fluids on Event Day (5.91±2.38 L; 49% water) to maintain body mass within 0.76 kg, start to finish, despite a sweat loss of 1.13±0.54 L·h and calculated energy expenditure of 3,115 Kcal·10.5h. However, men voluntarily under-consumed food energy (deficit of 2,594 Kcal, 10.9 MJ), and specific macronutrients (carbohydrates, 106±48 g; protein, 8 ± 7 g; and sodium, 852 ± 531 mg) between 0530 and 1400 h. Also, a few men exhibited extreme final values (i.e., urine specific gravity of 1.035 to 1.038, n=5; body mass loss >4 kg, n=2; TGI, 39.4 and 40.2). We concluded that these findings provide information regarding energy consumption, macronutrient intake, hydration status and the physiological stresses that are unique to ultra-endurance exercise in a hot environment.( 268 words).
Authors:
Lawrence E Armstrong; Douglas J Casa; Holly Emmanuel; Matthew S Ganio; Jennifer F Klau; Elaine C Lee; Carl M Maresh; Brendon P McDermott; Rebecca L Stearns; Jakob L Vingren; Jonathan E Wingo; Keith H Williamson; Linda M Yamamoto
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-19
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
University of Connecticut, Human Performance Laboratory, Dept. of Kinesiology, Storrs, CT 06269-1110, USA.
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