Each bean contains 0.8 - 2.5 % caffeine. For your information in an average cup of coffee you have 75mg caffeine. One cup of coffee contains around 25 coffee beans, and you are not getting the full coffee bean in coffee, so the caffeine can add up if you eat a lot.
The reason why temperature effects muscles is because of the numerous atoms in the body that react to temperature. When the air, or body temperature is colder the atoms tend to stay closer together, causing less movement...when it is hot, the atoms (molecules) move around more, causing more range of motion. It also allows blood to flow more easily when it is warm than cold.
However, in circumstances in which a human has no way to escape the cold temperatures, the skeletal muscles begin shivering. This shivering motion causes friction to occur, which generates heat for the body and helps the human to maintain homeostasis. Sometimes, the skeletal muscles work in opposition to homeostasis. For example, during exercise â which relies on the functioning of skeletal muscles â pulse rate, blood pressure and breathing rate must change to offset the high oxygen demands of the muscles and the increased temperature to the body, in order to maintain homeostasis.