A new article in the current issue of JAMA reports on a randomized controlled trial that compared the effects of different types of exercise on people with type 2 diabetes. The objective of the study was to examine the benefits of aerobic training alone, resistance training alone, and a combination of both on hemoglobin A1c (HbA1c). The study group of 262 sedentary men and women was enrolled in a 9-month exercise program with random assignment to one of four groups. Forty-one participants were assigned to the non-exercise control group, 73 to resistance weight-training 3 days a week, 72 to aerobic exercise in which they walked on a treadmill for the equivalent to a brisk, 4 mph walk for 50 minutes 3 times per week, and 76 to combined aerobic and resistance training in which they walked on the treadmill 3 times per week and did two weight lifting sessions each week. The workouts were designed so that each would take about the same amount of time at 140-150 minutes per week.
Results indicated that participants in all exercise groups reduced their waist circumference and lost weight compared with the control group. Only the combination group improved maximum oxygen consumption. Although HbA1c didn’t change significantly for people who did aerobic training only or resistance training only, it fell by 0.34 percent in the combination exercise group, which would translate to a decreased risk of heart disease and microvascular complications.
Dr. Timothy Church, the study’s author, noted that their findings support the 2008 federal physical activity guidelines, which recommend that people get at least 150 minutes of walking or 75 minutes of running a week, along with two or more days a week of resistance training.
1) Effects of Aerobic and Resistance Training on Hemoglobin A1c Levels in Patients With Type 2 Diabetes
Timothy S. Church, MD, MPH, PhD; Steven N. Blair, PED; Shannon Cocreham, BS; Neil Johannsen, PhD; William Johnson, PhD; Kimberly Kramer, MPH; Catherine R. Mikus, MS; Valerie Myers, PhD; Melissa Nauta, BS; Ruben Q. Rodarte, MS, MBA; Lauren Sparks, PhD; Angela Thompson, MSPH; Conrad P. Earnest, PhD
JAMA. 2010;304(20):2253-2262. doi:10.1001/jama.2010.1710
2) Weights plus walking equals more fit in less time.
http://www.cnn.com/2010/HEALTH/11/23/weights.plus.walking/index.html?hpt=Sbin. Accessed 11/24/10.