2.2. Data Collection
Prior to the first time point, a full-body dual-energy X-ray absorptiometry (DXA) was performed using a Lunar iDXA scanner (GE Healthcare Lunar, Madison, WI, USA) to assess body composition. Baseline characteristics including height, type of sport, and—if applicable—lesion characteristics were collected at the first time point. Further measurements took place at each of the four time points; T0 = baseline, T1 = 4 weeks, T2 = 8 weeks, and T3 = 12 weeks. Athletes were instructed to record their weighed food intake and photograph their meals for three consecutive days prior to each of the time points. Similarly, exercise information was recorded for three consecutive days prior to each time point on a paper form or in an online training diary program. Details on time, duration, type of sport, and intensity were documented. Training intensity was rated using one out of four intensities according to Hottenrott [