incidentally that is why 7 furlongs is such a specialist distance, as horses switch between aneorobic and aerobic at around the 6-7 furlong mark and depending when and how this transition occurs results in horses which are particularly good at 7 furlongs or not.
aneorobic / aerobic energy. aneorobic energy is more explosive energy, however it very quickly builds up lactic acid in the muscles so can only be sustained for very short periods. a horses body then changes aerobic energy, which is easier to use but horses cannot go fast using it. therefore sprinters use aneorobic energy for the first 5-6 furlongs and then switch to aerobic. resulting in the uneven fractions.
aneorobic / aerobic energy. aneorobic energy is more explosive energy, however it very quickly builds up lactic acid in the musclesso can only be sustained for very short periods. a horses body then changes aerobic energy, which is easier to use but