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ARS Home » Plains Area » Grand Forks, North Dakota » Grand Forks Human Nutrition Research Center » Healthy Body Weight Research » Research » Publications at this Location » Publication #290401
Title: Lifestyle intervention improves heart rate recovery from exercise in adults with Type 2 diabetes: Results from the Look AHEAD Study

Author
item Raatz, Susan

Submitted to: Journal of Obesity
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/14/2012
Publication Date: 10/15/2012
Citation: 290401Raatz, S.K. 2012. Lifestyle Intervention Improves Heart Rate Recovery from Exercise in Adults with Type 2 Diabetes: Results from the Look AHEAD Study. Journal of Obesity. doi:10.1155/2012/309196.

Interpretive Summary: This study evaluated the effect of intensive lifestyle weight loss and exercise intervention (ILI) compared with diabetes support and education on heart rate recovery (HRR) after graded exercise testing and the combined effects of weight loss and fitness changes upon HRR. In 4503 participants (45–76 years) who completed 1 year of intervention, those in the ILI lost an average 8.6% of their initial weight versus 0.7% in DSE group while mean fitness increased in ILI by 20.9% versus 5.8% in DSE. At Year 1, all exercise and HRR variables in ILI improved. Weight loss and fitness gain produced significant separate and independent improvements in HRR.

Technical Abstract: The primary aims of this paper were (1) to evaluate the influence of intensive lifestyle weight loss and exercise intervention (ILI) compared with diabetes support and education (DSE) upon Heart Rate Recovery (HRR) from graded exercise testing (GXT) and (2) to determine the independent and combined effects of weight loss and fitness changes upon HRR. In 4503 participants (45–76 years) who completed 1 year of intervention, HRR was measured after a submaximal GXT to compare the influence of (ILI) with (DSE) upon HRR. Participants assigned to ILI lost an average 8.6% of their initial weight versus 0.7% in DSE group (P < 0.001) while mean fitness increased in ILI by 20.9% versus 5.8% in DSE (P < 0.001). At Year 1, all exercise and HRR variables in ILI improved (P < 0.0001) versus DSE: heart rate (HR) at rest was lower (72.8±11.4 versus 77.7±11.7 b/min), HR range was greater (57.7 ± 12.1 versus 53.1 ± 12.4b/min), HR at 2 minutes was lower (89.3 ± 21.8 versus 93.0 ± 12.1 b/min), and HRR was greater (41.25±22.0 versus 37.8±12.5 b/min).Weight loss and fitness gain produced significant separate and independent improvements in HRR.