Biomedical subjects

J H Veghte

Publications and source records attributed to J H Veghte.

3 recordsLinked to original sources

PubMed1979

Temperature changes during exercise measured by thermography.

The present study explores the dynamic changes of surface temperatures associated with peripheral vascular shifts during and following hand gripping, one-legged ergometric, and running exercise. An AGA 680 thermovision system, incorporating a Bolex 16-mm camera and displaying 10-colored isotherms on a slave monitor, generated synchronous infrared (IR) movies at 16 frame/s. Incremental increases in surface skin temperatures (Ts) were observed while gripping at 20, 50, and 80% of maximum with a peak rise of 1.7 degrees C. Thermographic recorded Ts changes during dynamic one-legged exercise were higher in the exercising leg than the resting leg. Surface temperatures dropped in both limbs following exercise. The advantages of the use of thermography during transient thermal states, as produced by dynamic exercise, is supported by comparative Ts data taken from thermograms and thermistors.

Hand↗

PubMed1977

Thermographic evaluation of the relative heat loss by area in man after swimming.

Regional differences in skin temperature (Ts) were determined by infrared radiography in four competitive swimmers of varying body compositions, prior to, after 5 min of immersion in water (Tw) at 23.5 degrees C, and after a 500-m freestyle swim at a training pace. Decreases in skin temperature that correlated with skinfold thickness were seen post-immersion (r = 0.56, p less than 0.05). After swimming, skin temperatures were highest in regions overlying active muscle masses and were independent of skinfold thickness. These regions were the deltoids, trapezius, triceps and biceps brachi, and pectorals. Swimming increased the extent of warmer skin surface areas and gradient Ts-Tw, over which heat loss could occur.

Adolescent↗

PubMed1976

Jackrabbit ears: surface temperatures and vascular responses.

Blood flow to the ear pinnae is curtailed at ambient temperatures of between 1.4 degrees and 24 degrees C, which minimizes heat loss across the pinnae and allows the surfaces of erect pinnae to approach ambient temperature. The pinnae are warmed by steady or pulsatile vasodilation in some animals when the ambient temperature is between 1 degree and 9 degrees C below body temperature, a response favoring heat loss. When ambient temperature exceeds body temperature by 4 degrees to 5 degrees C, the pinnae are circulated with blood cooler than ambient temperature; this response favors heat influx.

Animals↗