June 2007 Vol. 11 No. 6   
 Editor: Dr. Lonnie Lowery

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Editor's Corner
ASEPNewsletter Growth
Lowery, L.

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Dietary Fat Intake is not Associated with High Levels of Circulating Lipoproteins or Total Cholesterol (second on page)
Brahler, C., et al.

  This month: Summer heat... Are you hydrated enough?
Mike, J.

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Power of a Vision  
Boone, T.

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The ASEP Board of Directors


Editor's Corner
ASEPNewsletter Growth!
Lonnie Lowery, PhD, MA, MS, RD, LD
ASEPnewsletter Editor, ASEP Board of Directors

As Editor, this month I'd simply like to share information on the growth of this
Newsletter. The number of regular subscribers the the ASEPnewsletter has grown
steadily despite a moderate number of bounces each month (old defunct email
addresses on our list). These bounces, and the rare "unsubscribe", are regularly
outpaced by several new subscribers each month - which is encouraging. For you
web connoisseurs, other markers such as total number of separate openings and
total number of clicks have roughly mirrored the subscriber growth.

Is the growth modest by some standards? Yes. But as a young, "specialty group"
specific to exercise physiology, the scale on which we operate is not surprising
to this Editor. Of course, one could go on about the much larger number of total
persons who periodically receive the Newsletter (now in the thousands) but, to
me, it is most fair to discuss purposeful monthly subscribers. It is no secret
that we are not a large, non-specific body of professionals, catering to the
interests and needs of multiple professions. Instead, we are the dedicated,
specific voice for Exercise Physiologists, championing their cause, from helping
with jurisprudence issues to finding meaningful employment, to defining scope of
practice standards, to providing a code of ethics, to providing a forum for
research publications and professional papers.    

Having watched the ASEPnewsletter grow from essentially zero subscribers at its

start, I can tell you that the steadiness of the growth had been gratifying. The
slowness may be difficult for impatient persons but the increase in regular
subscribers does suggest that the multitudes of exercise physiologists who have
yet to hear about ASEP are catching a whiff. There are many exercise
physiology-related professionals out there, from professors and clinicians who
could contribute significantly to the mission, to recent graduates who are
likely to feel a need for community when the excitement of graduation wares off
and employment realities set-in. If you know someone like this, just forward
this email or have them check out www.asep.org. They can easily subscribe in the
"Register for FREE ASEP email updates" section of this Newsletter.

So thank you, subscribers. You, along with an even larger number of
professionals who support ASEP's mission in less direct ways, keep an essential
source of change and resources alive. 

Ask the EP:
Your Inside Scoop on Tough Questions

Ask the Exercise Physiologist (EP) is intended for informational purposes only. It is
not to be taken as healthcare advice. Please do not submit questions of a personal nature (e.g., fitness programs and nutrition advice solicitation). Thanks.

Question:  From a physiological perspective, what are some factors affecting
fluid loss? 

The EP Answer
by Jonathan Mike, MS, CSCS,

Several factors affect the rate at which an athlete can produce sweat. Higher ambient temperatures result in a greater potential for sweat production. Higher humidity is also responsible for higher sweat production, but because the vapor pressure gradient and skin is low, the cooling potential (i.e., the rate of evaporation off the skin) is lower in humid environments. The same problem also exists with clothing that traps sweat against the skin (i.e., does not breathe). This type of clothing results in a reduced cooling efficiency that
forces a greater sweat rate. (Sweat-soaked clothing doesn’t mean an athlete is
effectively controlling body temperature, it just means he or she is losing water.) Some new materials designed for athletes actually wick sweat away from the skin to improve evaporative efficiency. Athletes with large body surface areas may also have an enhanced sweat production capacity and, therefore, an enhanced evaporative heat loss. But these athletes may also gain more heat from the environment through radiation and convection in hot weather. The conditioning or training state of an athlete makes a difference.
Well-conditioned athletes have a higher sweat volume potential that results in
an enhanced cooling potential. However, this higher sweat rate requires a greater during-exercise fluid consumption to avoid higher heat-stress risk.

In addition, because sweat has a lower osmolality than does plasma (i.e., sweat is hypotonic), profuse sweating increases plasma osmolality. Whether or not this
increased plasma osmolality affects body temperature or cooling capacity in an
exercising individual is, as yet, unclear, but a sufficient change in osmolality and volume does stimulate the kidneys to excrete sodium and reduce urine output by producing more concentrated urine.

An athlete’s state of fluid balance also plays a factor; the better the hydration state, the greater the sweat potential. As athletes become progressively dehydrated, the sweat rate is reduced, and body temperature rises. This is a problem because fluid consumption during activity is rarely greater than 2 cups (480 milliliters) per hour, or only 30 to 40 percent of the amount of fluid lost in sweat, an amount that will inevitably lead to the athlete’s becoming dehydrated. Consider that marathoners competing in a cool temperature of 50 to 54 degrees Fahrenheit (10 to 12 degrees Celsius) lose between 1 and 5 percent of total body mass. Marathoners competing in warm weather lose about 8 percent of total body mass, or between 12 and 15 percent of total body water.

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