Effect of a worksite-based intervention program on metabolic parameters in middle-aged male white-collar workers: A randomized controlled trial

Objective. An effective program for preventing metabolic diseases through lifestyle modification is urgently needed. We investigated the effects of the Life Style Modification Program for Physical Activity and Nutrition program (LiSM10!((R))) on metabolic parameters in middle-aged male Japanese white-collar workers. Methods. One hundred and one male office workers, 30 to 59 years of age, with metabolic syndrome risk factors, were randomly allocated into no-treatment control (n = 49) and LiSM intervention (n = 52) groups. The LiSM group attended individualized assessment and collaborative goal setting sessions based on food group intake and physical activity, followed by two individual counseling sessions with a registered dietitian and physical trainer, and received monthly website advice during the 4-month period from December 2006 to May 2007, in Tokyo, Japan. They were encouraged to enter current targeted food intakes and pedometer data on self-monitoring websites during the entire study period. Results. Habitual food group intakes changed significantly in the LiSM group, showing improvements in 14 anthropometric and biochemical parameters contributing to inter-group differences in body weight, body mass index, fasting plasma glucose, insulin and homeostasis model assessment of insulin resistance changes (p<0.01). Conclusion. The LiSM10!((R)) program effectively improved insulin resistance-related metabolic parameters in middle-aged male white-collar workers. (C) 2010 Elsevier Inc. All rights reserved.