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High-Intensity Exercise Best for Improving Body Composition

by Matrix Admin | Aug 01, 2011
Abdominal, visceral fat levels reduced through vigorous activity

INDIANAPOLIS –  Although any type of exercise is beneficial for health, high-intensity exercise is likely necessary to achieve significant improvements in body composition, according to a study released today in Medicine & Science in Sports & Exercise®, the official journal of the American College of Sports Medicine.

Arthur Weltman, Ph.D., and his team studied 27 middle-aged obese women with metabolic syndrome – a group of risk factors that includes abdominal obesity, unhealthy cholesterol levels, high blood pressure, elevated triglycerides and elevated fasting glucose. Seven of the women did not change their activity levels; 11 performed low-intensity (~50-60 percent of maximum aerobic capacity) exercise five days per week; and nine performed low-intensity exercise two days and high-intensity exercise (~75-80 percent of maximum aerobic capacity) three days per week.

The high-intensity group reduced total abdominal fat, subcutaneous abdominal fat, and visceral abdominal fat during the 16-week exercise period. Visceral fat surrounds the organs (e.g., liver and kidneys), and excessive amounts are associated with the development of diabetes, heart disease and high blood pressure.

“Improving body composition can improve overall health and quality of life, and exercise-induced reductions in total and visceral abdominal fat can significantly lower the risk of chronic disease,” Weltman said. “For obese women entering the middle and later stages of life, reducing internal abdominal fat or preventing too much of it forming is crucial. Exercise, especially vigorous exercise, may be the best way to do it. High-intensity exercise was prescribed based on each individual’s capabilities and allowed each woman to complete the exercise bouts. Often, people think they cannot engage in high-intensity exercise because they associate it with what athletes are able to do, not what is high-intensity for them. It varies from person to person.”

Weltman stressed that simply starting an exercise program is key to working toward enough exercise to change body composition. ACSM and the American Heart Association recommend that healthy adults 18 to 65 years old need moderate-intensity aerobic physical activity for at least 30 minutes on five days each week or vigorous-intensity aerobic physical activity for at least 20 minutes on three days each week. However, overweight and obese persons may need up to 300 minutes of exercise per week to lose weight. For those new to exercise, ACSM has created resources for getting started at www.acsm.org/physicalactivity.

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The American College of Sports Medicine is the largest sports medicine and exercise science organization in the world. More than 35,000 international, national, and regional members and certified professionals are dedicated to advancing and integrating scientific research to provide educational and practical applications of exercise science and sports medicine.

NOTE: Medicine & Science in Sports & Exercise® is the official journal of the American College of Sports Medicine, and is available from Lippincott Williams & Wilkins at 1-800-638-6423. For a complete copy of the research paper (Vol. 40, No. 11, pages 1863-1872) or to speak with a leading sports medicine expert on the topic, contact the Department of Communications and Public Information at 317-637-9200 ext. 127 or 133. Visit ACSM online at www.acsm.org.

The conclusions outlined in this news release are those of the researchers only, and should not be construed as an official statement of the American College of Sports Medicine.

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