The deployment of sensor networks is both widespread and varied with more niche applications based on these networks. In the case study provided in this work, the network is provided by two football teams with sensors generating continuous heart rate values for the duration of the activity. In wireless networks such as these, the requirement is for complex methods of data management in order to deliver more and more powerful query results. In effect, what is required is a traditional database-style query interface where domain experts can continue to probe for the answers required in more specialised environments. This paper describes a system and series of experiments that requires powerful data management capabilities to meet the requirements of sports scientists.