Metabolic and vasomotor responses of rhesus monkeys exposed to 225-MHz radiofrequency energy
A previous study showed a substantial increase in the colonic temperature of rhesus monkeys (Macaca mulatta) exposed to radio-frequency (RF) fields at a frequency near whole-body resonance and specific absorption rates (SAR) of 2 to 3 W/kg. The present experiments were conducted to determine the metabolic and vasomotor responses during exposures to similar RF fields. Five adult male rhesus monkeys were exposed to 225-MHz radiation (E orientation) in an anechoic chamber. The monkeys were irradiated at two carefully-controlled ambient temperatures, either cool (20 C) or thermoneutral (26 C). Power densities ranged from 0 (sham) to 10.0 mW/sq cm with an average whole-body SAR of 0.285 (W/kg)/(mW/sq cm). Two experimental protocols were used, each of which began with a 120-min preexposure equilibration period. Then, one protocol involved repetitive 10-min RF exposures at successively higher power densities with a recovery period between exposures. In the second protocol, a 120-min RF exposure permitted the measurement of steady-state thermoregulatory responses. Metabolic and vasomotor adjustments in the rhesus monkey exposed to 225 MHz occurred during brief or sustained exposures at SARs at or above 1.4 W/kg. Metabolic and vasomotor responses were coordinated effectively to produce a stable deep-body temperature. The results show that the thermoregulatory response of the rhesus monkey to an RF exposure at a resonant frequency limits storage of heat in the body. However, substantial increases in colonic temperature were not prevented by such responses, even in a cool environment.
- Research Organization:
- Naval Aerospace Medical Research Lab., Pensacola, FL (USA)
- OSTI ID:
- 6326037
- Report Number(s):
- AD-A-180107/5/XAB; NAMRL-OL-87-2
- Resource Relation:
- Other Information: Pub. in Bioelectromagnetics, Vol. 8, 73-89(1987)
- Country of Publication:
- United States
- Language:
- English
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METABOLISM
BIOLOGICAL RADIATION EFFECTS
VASODILATION
ABSORPTION
ADULTS
BODY TEMPERATURE
COOLING
DENSITY
MALES
MONKEYS
SHORT WAVE RADIATION
STABILITY
TEMPERATURE CONTROL
AGE GROUPS
ANIMALS
BIOLOGICAL EFFECTS
CONTROL
ELECTROMAGNETIC RADIATION
MAMMALS
PHYSICAL PROPERTIES
PRIMATES
RADIATION EFFECTS
RADIATIONS
RADIOWAVE RADIATION
VERTEBRATES
560400* - Other Environmental Pollutant Effects