3947
Maximal exercise heart rate was reduced from 187 + / - 4 ( SEM ) after placebo to 146 + / - 7 bpm after atenolol and 138 + / - 6 bpm after propranolol , but there were no differences between the drugs .
 Chemical: atenolol; Chemical: propranolol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: atenolol; Chemical: propranolol