Metabolic power in 1 hz - 15(5) hz GPS system.
Everybody who works with any short of technology must be aware of its limitations and capabilities, in order to take the best profit of it.
Despite this obvious statement, sometimes we are not conscious of this limitations - capabilities.
Several authors have correctly state that working with GPS systems applied to control the loads when training or playing a game, has some limitations based on the frequency of the system.
In that way, I want to share with you this simple study, in which raw data get by a 5 hz (extrapolated to 15 hz) is used to obtain the metabolic power (see Di Prampero et al. 2005, 2009, Osgnach et al. 2010, and R. Colli in his italian web for further information about metabolic power) of a possession game 8 against 8 (small sided game) has been used to compare with the same data obtained as 1 hz system (the difference is just that with 15 hz you have 15 data per second, and with 1 hz you just take one data each second).
General conclusion: maybe for general comparisons of average data can be used without loosing info, but clearly is not useful for studying maximal values.
Enjoy,