Nine women soccer players at the State
University of New York (SUNY) at Buffalo
went more than one mile farther before reaching exhaustion on a diet of 35 percent fat, says study author, Peter J. Horvath.
"That is really a striking difference," says
Horvath, an associate professor at SUNY
at Buffalo's School of Health Related
Professions.
Women in the study went on three different
diets during the second half of three
menstrual periods. One month, three
women were on a normal diet; another
three ate a normal diet plus 415 calories of
oil-roasted peanuts a day, and the
remainder ate the normal diet plus an equal amount of extra calories from
carbohydrate-rich energy bars. Each group
switched the following month so that after
three months, all had been tested on each
of diet.
Each diet was tested for seven days during the luteal phase (the second half) of the menstrual cycle, when a woman's ability to metabolize fat is the greatest, Horvath says.
The peanut diet included 35 percent of calories from fat, compared with 24 percent on the energy-bar diet. The normal diet had 27 percent fat.
The energy-bar diet contained 63 percent carbohydrates, compared to 51
percent on the peanut diet. Protein and calorie intake and caloric expenditure
were essentially the same in all three diets.
The endurance tests mimicked soccer play using three running methods: constant-speed, running at different rates on a treadmill and forward running with a side-step maneuver performed on a force plate. The athletes were
tested until exhaustion on the seventh day of each diet.
The results showed that team members traveled 11.2 kilometers on the high-fat diet, 10 kilometers on the normal diet and 9.7 kilometers on the high-carbohydrate diet. Muscle performance, measured by the force plate, remained the same.
Columbia University's women's soccer coach Kevin McCarthy says the study's findings, originally presented at an annual meeting of the Federation of American Societies of Experimental Biology, could be helpful.
"Outside of planning a lot of meals during the season, we stick to having [our players] eat well and get the proper mix of carbohydrates and fats. [This information] isn't dangerous or a fad. It's an easy thing to pass along to players," McCarthy says.
Horvath says a high-fat diet seems to be more of a boost to women than to men, based on previous studies he has done with male athletes.
"Men responded to calories, but woman responded to fat," he says.
As a result of his findings, he says, "Any research that had been done on men has to be redone for females. Dietary recommendations for women athletes should be different from men's."
"An athletically fit woman's fat intake in her diet should be about 25 percent,"
says St. Louis dietician and personal trainer Ellie Zografakis. But she says
there is no harm in higher fat intake for athletes because endurance exercise is a very efficient use of fat.
"With a diet of 35 percent fat fuel, [the athletes] would have more energy, feel
more powerful," she says. However, she warns against increasing the fat intake by lowering the carbohydrate intake too much. An intake below 50 percent would be inadequate for performance, she says.
Zografakis says, in fact, most of her clients don't get enough fat; only 10 to 20 percent of their calories come from fat, which she says is too low.
"Fat is taboo for all women. They are not willing to increase their fat intake,"
she says. Instead, she says many women have a high carbohydrate intake -- as much
as 80 percent of their diet -- which can cause bloating along with a lack of energy.
What To Do
Tufts University rates a number of commercial sites that offer nutrition advice for athletes.
For general information about fat in diets, see the Heart Information Network.
NOTE: Any links to external sites will open in a new browser window. External
sites are not part of drkoop.com, and drkoop.com has no control over their content or availability.
SOURCES: Interviews with Peter J. Horvath, Ph.D., associate professor, Department of Physical Therapy, Exercise and Nutrition Sciences, SUNY at Buffalo, N.Y., School of Health Related Professions; Ellie Zografakis, R.D., American Council on Exercise personal trainer, co-owner,Nutriformance, St. Louis, Mo., and Kevin McCarthy, women's soccer coach, Columbia University, New York, N.Y.
||204.60.28.167||reg|| Z||000001||skydancer||08-09-2000||11:27 AM||skydancer43@hotmail.com||Interesting Cocktails...
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Patience is a bitter plant, but it has sweet fruit.
||209.179.216.159||reg|| Z||000002||WarLobo||08-09-2000||07:20 PM||warlobo@operamail.com||Good work CT - always need stuff to read!
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LAte
Lobo||12.10.120.15||reg|| Z||000003||MS||08-09-2000||10:56 PM||mad.scientist55@hushmail.com||Great. Now they've determined that female endurance athletes are different to males! One thing that endurance athletes have known for decades is that they need more carbs and fat than bodybuilders (whether male or female). They need both to fuel those long events. Interesting none-the-less. Maybe that's why women need more chocolate than men? ||139.80.64.4||reg||