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ACSM News Briefs

ACSM's Health & Fitness Journal: March/April 2020 - Volume 24 - Issue 2 - p 2-3
doi: 10.1249/FIT.0000000000000558
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MICT OR HIIT + RT PROGRAMS FOR ALTERING BODY COMPOSITION IN POSTMENOPAUSAL WOMEN

The incidence of obesity, type 2 diabetes, and cardiovascular disease (CVD) in women significantly increases after menopause and is related to an increase of fat mass (FM), loss of fat-free mass (FFM) (especially muscle mass), and body fat distribution alterations. The increase of subcutaneous and particularly intra-abdominal FM (i.e., visceral FM) after menopause partly explains the higher CVD risk in postmenopausal women. The aim of this study, published in the March 2020 issue of Medicine & Science in Sports & Exercise®, was to compare the body composition and fat oxidation (FatOx) changes induced by a 12-week moderate-intensity continuous training (MICT), high-intensity interval training (HIIT), or HIIT + resistance training (RT) intervention in postmenopausal women with overweight or obesity.

Participants (n = 27) were randomized into three groups: MICT (40 minutes at 55% to 60% of peak power output, PPO), HIIT (60 × 8 seconds at 80% to 90% of peak heart rate, 12 seconds active recovery), and HIIT + RT (HIIT + 8 whole-body exercises: 1 set of 8 to 12 repetitions). Dual-energy X-ray absorptiometry was used to measure whole-body and abdominal/visceral FM and FFM. FatOx was determined at rest, during a moderate-intensity exercise (40 minutes at 50% of PPO), and for 20 minutes postexercise, before and after training.

Overall, energy intake and physical activity levels did not vary from the beginning to the end of the intervention. All three modalities improved body composition (body weight, FM loss), but HIIT (alone and with RT) led to a greater percentage of FM loss. Moreover, abdominal and visceral FM (%) were only reduced in the HIIT and HIIT + RT groups and were significantly different from MICT. The study’s results also indicate that HIIT-induced total or (intra)-abdominal FM losses were not related to higher FatOx during moderate-intensity exercise or during the 20-minute postexercise period. Additional studies are needed to better understand the underlying mechanisms of HIIT-induced FM loss and to determine whether the concomitant muscle mass gain induced by RT potentiates these adaptations.

DO NOT MISS ACSM’S INTERNATIONAL HEALTH & FITNESS SUMMIT IN ATLANTA!

Calling all certified health practitioners, fitness professionals, and students planning to enter the health and fitness industry. If you are searching for the latest educational advances in the field, inspiration, and networking opportunities, this is YOUR meeting! You will find many different types of opportunities to meet your needs, including hot topic panel discussions and keynote lectures with some of the industry’s leading experts. In addition to our renowned research-backed lectures, daily on-trend workouts, and hands-on workshops, this is an excellent opportunity to network with our world class speakers, and to see what’s new in our Expo, all while earning more than 22 continuing education credits (CECs)! Make plans to attend ACSM’s International Health & Fitness Summit March 12–15 in Atlanta, GA.

To view the session schedule or to learn more about the not-to-be-missed Summit, visit www.acsmsummit.org. Preregistration (http://acsmsummit.org/registration/) ends on March 3, 2020. After March 3, you can register onsite at the summit.

YOUTH FITNESS FOR THE iGENERATION

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Modern life means that fewer children now walk or bike to school, they spend less time playing outdoors, and spend more time in front of television, computer, and phone screens. This means the majority of boys and girls are not developing adequate movement skills and are not meeting guidelines for completing healthy amounts of vigorous muscle- or bone-strengthening exercise. In Essentials of Youth Fitness, authors Avery D. Faigenbaum, Ed.D., FACSM; Rhodri S. Lloyd, Ph.D.; and Jon L. Oliver, Ph.D., provide a guide for those who work with children and can positively affect their experience of exercise; this includes coaches, teachers, parents, and those working in the various medical professions. The text explains the basis of exercise science in children and provides information on how to effectively engage children, how to design exercise programs for youth, as well as considering issues such as the young athlete, special populations, and the influence of nutrition. Help is provided through the presentation of sample programs for inactive children, young athletes, and youth with clinical conditions. Fitness practitioners and health care providers can use this book to bridge the gap between the science and practice of youth fitness.

For additional information about the book, please visit: https://www.acsm.org/read-research/resource-library/resource_detail?id=2978960a-e236-4f37-9732-7cd86f522dd3.

© 2020 American College of Sports Medicine.