Heat Stress & Training

[Guest guest]

I'm looking for information on heat stress onset. Most of what I've

seen in print can be characterized as minor variations on the same

information: synoptic overviews of symptoms of heat stress ranging

from rashes through heat stroke.

Since moving to Central Texas two years ago adapting myself and my

training to the relatively high temperatures and substantive humidity

remain a challenge - with a paucity of guiding information. Prior to

moving here I spent 12 years in Tucson, findng the higher temperatures

of that arid desert relatively easy to adapt to - as long as I trained

myself to get into my home gym by 430 am!

My training goes pretty well here. I'm certainly increasing in both

size and strength. But as the last month of 90-100 degree weather has

beset us all, I'm finding I begin dragging half way through a session.

So I've cut back some on volume. I use Ivy's nutrient timing

system, keepig hydrated throughout and post-workout. Despite that, two

phenomenological markers have appeared: (1) a marked propensity to

fall into a deep nap with 30-45 minutes of a workout, something new to

me; (2) a deepening sense of fatigue when out in the heat. Annoying

diarrhea seems to accompany those symptoms.

Changes I'm making are either very early morning training or off to

air conditioned facilities.

Nevertheless, I'm interested to learn of accounts and/or literature

detailing heat stress onset - in part, to have biomarkers to watch for

so this doesn't sneak up on me again.

best regards,

Ken O'Neill

Long Life Fitness

Austin, Texas

[Guest guest]

> Changes I'm making are either very early morning training or off to

> air conditioned facilities.

>

> Nevertheless, I'm interested to learn of accounts and/or literature

> detailing heat stress onset - in part, to have biomarkers to watch

for

> so this doesn't sneak up on me again.

****

The following references may be useful:

Armstrong, L.E. (2000) Performing in Extreme Environments. Human

Kinetics: Champaign, IL, USA.

Reilly, T. and Cable, N.T. (2001) Thermoregulation, In:

Kinanthropometty and Exercise Physiology Laboratoty Manual: Tests

Procedures and Data. Volume 2: Exercise Physiology. Routledge: London

Fanger PO (1970) Thermal Comfort. New York: McGraw-Hill

RR (1995) Biophysics of heat exchange and clothing:

applications to sports physiology. Medicine Exercise Nutrition and

Health 4, 290-305

Kerslake DM (1972) The Stress of Hot Environments. Cambridge:

University Press

JW, Nadel ER, Stolwijk JAJ (1972) Respiratory weight losses

during exercise. Journal of Applied Physiology 32,474-476

Parsons KC (1993) Human Thermal Environments. London: and

Francis

Galloway, S.D.R. and Maughan, R.J. (1997) Effects of ambient

temperature on the capacity to perform prolonged cycle exercise in

man. Medicine and Science in Sports and Exercise, 29: 1240-1249

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Carruthers

Wakefield, UK