Accession Number : ADA323977

Title :   Characterization of a Three-Phase Response in Cold-Stressed Fingers.

Descriptive Note : Technical rept.,

Corporate Author : ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Personal Author(s) : Shitzer, Avraham ; Endrusick, Thomas L. ; Stroschein, Leander A. ; Wallace, Robert F. ; Gonzalez, Richard R.

PDF Url : ADA323977

Report Date : MAR 1997

Pagination or Media Count : 104

Abstract : Seven gloves were tested in 8 subjects (6 males and 2 females) in cold-dry, C-D, (db= -17.2 deg C; dp= -25.1 deg C), and cold-wet, C-W, (dp=0 deg C; dp= -8.4 deg C) conditions. Endurance times were 75 min (C-D) and 162 min (C-W). Females endurance times were significantly (p<0.05) shorter at 47 and 127 min, respectively. A three-phase response pattern of the fingers was characterized. In Phase I finger-tip temperature remains close to the initial level, due to delayed vasoconstriction DURATIONS:15 MIN (C-D), 43 min (C-W). In Phase II vasoconstriction causes an exponential-like decrease of finger temperature-tip DURATIONS: 36 MIN (C-D), 62 min (C-W). Phase III manifests periodic finger temperature changes due to cold induced vasodilatation CIVD; durations: 20 min (C-D), 58 min (C-W)). Average wave patterns for Phase III showed 31/2 waves/hr (C-D) and only about 2 waves!hr (C-W). Extension of endurance times due to CIVD, were 13 min in the C-D and 31 min in the C-W conditions. Three overall response patterns of fingers in the cold were characterized: (1) Type A exhibiting all 3 phases; (2) Type B1 or B2 exhibiting either Phases I+II or Phases II+III; and, (3) Type C showing only Phase II.

Descriptors :   *COLD TOLERANCE, *ENDURANCE(PHYSIOLOGY), *FINGERS, TEMPERATURE, LOW TEMPERATURE, TIME, RESPONSE, PATTERNS, WAVES, FEMALES, GLOVES, VASOCONSTRICTING.

Subject Categories : Biology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE