Accession Number:

ADA209087

Title:

Thermoregulatory Responses to Intermittent Exercise Are Influenced by Knit Structure of Underwear

Descriptive Note:

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Personal Author(s):

Report Date:

1989-04-01

Pagination or Media Count:

26.0

Abstract:

The purpose of this study was to evaluate the role of knit structure in underwear on thermoregulatory responses. Underwear manufactured from 100 polypropylene fibers in five different knit structures 1-by-1 rib, fleece, fishnet, interlock, double-layer rib were evaluated. All five year underwear prototypes were tested as part of a prototype clothing system. Measured on a thermal manikin these clothing systems had total thermal resistances, Itot, of 0.243, 0.268, 0.256. 0.248 and 0.250 square meterkw, respectively. Human testing was done on eight male subjects and took place at Ta 5 C, tsp 3. 5 c and Va 0.32 ms. The test comprised a repeated bout of 40 min cycle exercise 315 wsquare meter 52 or - 4.9 maximum oxygen consumption followed by 20 min of rest wsqi M. VO2, heart rate, esophageal temperature, local skin temperatures, ambient air temperature, dew point temperature at three skin sites and in the ambient air were monitored. Onset of sweating was evaluated from the dew point sensor recordings. The differences in knit structure of the underwater in the clothing systems resulted in significant differences in mean skin temperature, local and average skin wetness, non-evaporated and evaporated sweat during the course of the core temperature.

Subject Categories:

  • Stress Physiology
  • Logistics, Military Facilities and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE