Can you clarify the methods used in your study

Can you clarify the methods used in your study...participants consumed three different meal conditions (high, low, ??) and then ran as fast and far as possible in 90min? And if everyone ran for a set 90min, how did the researchers determine that both the high and low GI groups "prolonged exercise"? Lastly, to what does "they" relate when discussing an increase in muscle glycogen (how was this measured and in what groups did they find changes)? 150 words, apa format sources and please answer questions completely and accurately