28685
However , after 8 - wks of treadmill training low - responders failed to improve their exercise capacity , while high - responders improved by 54 % .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None