If you already have a reasonable amount of fitness then it simply becomes sport specific conditioning. The groups that do 1 minute intense exercise will improve

If you already have a reasonable amount of fitness then it simply becomes sport specific conditioning. The groups that do 1 minute intense exercise will improve their all out efforts and make adaptations mainly in their anaerobic glycotic energy systems while the longer efforts will result in mainly aerobic improvements (increased capillarization, improved lactate threshold, etc). There's a whole host of literature wrt track and field athletes on this topic.