Document Detail

The influence of interval versus continuous exercise on thermoregulation, torso hemodynamics, and finger dexterity in the cold.
MedLine Citation:
PMID:  20229022     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to evaluate how interval (INT) and continuous (CONT) exercise alter body temperatures and manual dexterity in the cold (5 degrees C). Fourteen young men underwent two trials consisting of a 90-min period of acute cold exposure (ACE), 30 min of exercise (INT or CONT), and a 60-min recovery period (REC). Participants donned approximately 1 clo but the hands remained bare for the entire protocol so that a steep decline in dexterity performance occurred prior to the initiation of exercise. INT and CONT were isoenergetic, reflecting 50 +/- 1% of each individual's VO(2) peak. Rectal (Tre) and skin temperatures were monitored continuously and dexterity testing was conducted at ten time points throughout each 3-h trial. In addition, oxygen consumption (VO(2)) and torso hemodynamics were assessed via indirect calorimetry and impedance cardiography (ICG), respectively. As expected, finger temperature and dexterity declined during ACE, relative to baseline. Both modes of exercise increased finger temperature and dexterity, relative to ACE. However, CONT was more effective than INT at increasing finger temperature on the dominant hand, which was associated with better dexterity scores during REC. Tre was not different between trials but a significant increase in stroke volume was found following CONT. Perhaps elevated stroke volume during post-exercise REC plays a role in finger rewarming and dexterity performance. Further mechanistic studies are needed to confirm the role of cardiovascular function in the enhancement of manual performance in the cold.
Matthew D Muller; Edward J Ryan; David M Bellar; Chul-Ho Kim; Robert P Blankfield; Sarah M Muller; Ellen L Glickman
Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2010-03-13
Journal Detail:
Title:  European journal of applied physiology     Volume:  109     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-25     Completed Date:  2010-10-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  857-67     Citation Subset:  IM    
Exercise and Environmental Physiology Laboratory, Kent State University, Gym Annex 167, Kent, OH 44242, USA.
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MeSH Terms
Body Temperature / physiology
Body Temperature Regulation / physiology*
Cold Temperature*
Exercise / physiology*
Fingers / physiology*
Heart Rate / physiology
Hemodynamics / physiology*
Oxygen Consumption / physiology
Stroke Volume / physiology
Time Factors

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