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The influence of interval vs. continuous exercise on thermoregulation, torso hemodynamics, and finger dexterity in the cold (5°C)

Muller, Matthew David
http://rave.ohiolink.edu/etdc/view?acc_num=kent1255294775

Abstract Details

2009, PHD, Kent State University, College of Education, Health and Human Services / School of Health Sciences.
PURPOSE: The purpose of this study was to evaluate how interval (INT) and continuous (CONT) exercise alter body temperatures and manual dexterity in the cold. Since athletes, construction workers, and military personnel perform fine motor tasks with bare hands in a cold environment, we sought to determine if one mode of exercise was more efficient at restoring manual performance after a period of immobility. METHOD: Fourteen apparently healthy, fit, young men underwent two three-hour trials in 5 ± 1 °C air, separated by one week. All trials included a 90-minute period of acute cold exposure (ACE), 30 minutes of exercise (INT or CONT) and a 60-minute recovery period (REC). Participants donned approximately 1 clo but the hands remained bare for the duration of testing 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 VO2 max. Core and skin temperatures were monitored continuously and dexterity testing was conducted at ten time points throughout each 3-hour trial. In addition, oxygen consumption and torso hemodynamics were assessed via indirect calorimetry and impedance cardiography, respectively. RESULTS: As expected, finger temperature declined rapidly during ACE and caused a 32% reduction in dexterity performance, relative to thermoneutral conditions. Both modes of exercise increased finger temperature and manual performance, relative to ACE. However, CONT was significantly more effective than INT at increasing finger temperature, which resulted in significantly better dexterity scores during REC. Core temperature was not different between trials, which was expected. However, a significant increase in stroke index was found following CONT. CONCLUSIONS: It is suggested that a greater volume of warm blood in the torso facilitates finger rewarming (and thus dexterity performance) in the cold. The cascade of events from exercise mode to finger dexterity performance seems to be mediated in large part by the cardiovascular system.
Ellen Glickman, PhD (Committee Co-Chair)
Angela Ridgel, PhD (Committee Co-Chair)
Jacob Barkley, PhD (Committee Member)
Derek Damron, PhD (Committee Member)
John Gunstad, PhD (Committee Member)
98 p.
Biomedical Research; Physical Education
cold; exercise; dexterity; temperature; blood flow; homeostasis

Recommended Citations

Citations

  • Muller, M. D. (2009). The influence of interval vs. continuous exercise on thermoregulation, torso hemodynamics, and finger dexterity in the cold (5°C) [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1255294775

    APA Style (7th edition)

  • Muller, Matthew. The influence of interval vs. continuous exercise on thermoregulation, torso hemodynamics, and finger dexterity in the cold (5°C). 2009. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1255294775.

    MLA Style (8th edition)

  • Muller, Matthew. "The influence of interval vs. continuous exercise on thermoregulation, torso hemodynamics, and finger dexterity in the cold (5°C)." Doctoral dissertation, Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1255294775

    Chicago Manual of Style (17th edition)

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© 2009, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.