Design
This was a quasi-experimental (volunteer subjects) pre–post design with all subjects being randomly assigned to each of the four groups.
Methodology
Each subject underwent measurements of bodyweight and vertical jump. Pretesting was conducted the week prior to the initiation of the training period. Posttesting was conducted the week following training completion. Subjects were instructed to refrain from exercise for 48 hours and caffeine 24 hours prior to testing (Luebbers et al. 2003). Training intensity was reduced the final week of training to allow for sufficient recovery prior to posttestin