[Internet-based "e-training" as exercise intervention for health promotion: results from 2 intervention studies]

Internet-based interventions open a chance to improve the sustainability of rehabilitation in general and of exercise therapy in particular. The internet can be the sole intervention component on the one hand as well as a supportive tool for a traditional "Face-to-Face" intervention on the other hand. In this article, 2 studies in the setting of health promotion are outlined. Those studies evaluated an e-Training program in different administration forms.

Study 1: 90 adults with a sedentary lifestyle were randomized into 3 treatment groups: Group fitness ("Face-to-Face"), individually supervised training ("Face-to-Face") and e-Training (internet-based). The respective intervention took place across 3 months and each continued for a maintenance phase of 4 months. Muscular fitness, sports activities and health-related quality of life were assessed at 3 points in time: right before the intervention, after the first 3 months, and finally, after the maintenance -phase. Study 2: 509 adults with a high self-rated risk of recurrent back pain participated in the intervention "Rückengesundheit ERlangen", which lasted for 6 months: a combined program with its content delivered "Face-to-Face" and via e-Training. The analysis was conducted in a pre-post design without control group. Several psychosocial outcome variables were assessed (e.g., fear-avoidance beliefs/FABQ-D) and the cardio-pulmonary endurance capacity.

In study 1 and in study 2, significant improvements over time in all intervention groups were measured in nearly all of the dependent variables, with the exception of the physical component summary of health-related quality of life (HRQL) (SF-36) in study 1, as well as its mental component summary (SF-36) and the endurance capacity in study 2. In study 1, the graphical comparison (confidence interval) of e-Training with the "Face-to-Face" interventions shows a similar efficacy of both of them. A gender-specific evaluation reveals that the mental component of HRQL in women is significantly more improved by the group fitness intervention than by e-Training. Study 2 shows significant positive changes in the pre-post comparison regarding psychosocial risk factors of the chronification of back pain and for men significant improvements of the endurance capacity. However, no causal link could be established because of the -limitation of the study design.