OBJECTIVES: The aim was to investigate the effects of three different types of resistance training implementation. DESIGN: Randomized controlled trial. METHODS: Inactive, overweight women (n = 143), mean BMI 31.3 +/- 5.2 kg/m2, mean age 39.9 +/- 10.5 years, were randomized to one of the following groups: A (BodyPump group training), B (individual follow-up by a personal trainer), C (nonsupervised exercise), or D (controls). The intervention included 12 weeks of 45 to 60 minutes' full-body resistance training three sessions per week. The outcomes in this paper are all secondary outcome measures: exercise motivation, self-perceived health, and quality of life. RESULTS: Adherence averaged 26.1 +/- 10.3 of 36 prescribed sessions. After the intervention period, all three training groups (A to C) had better scores on exercise motivation (A 43.9 +/- 19.8, B 47.6 +/- 15.4, C 48.4 +/- 17.8) compared to the control group (D) (26.5 +/- 18.2) (p < 0.001). Groups B and C scored better on self-perceived health (B 1.9 +/- 0.8, C 2.3 +/- 0.8), compared to group D (3.0 +/- 0.6) (p < 0.001). For quality of life measurement, there was no statistically significant difference between either intervention groups or the control. CONCLUSIONS: Resistance training contributed to higher scores in important variables related to exercise motivation and self-perceived health. Low adherence showed that it was difficult to motivate previously inactive, overweight women to participate in regular strength training.

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