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.
1 Laboratory studies have shown that temperature can influence the stiffness of a muscle. By keeping the body and muscles warm, the muscle is less likely to sustain a strain type of injury.  Avoid Muscle Fatigue: Muscles help absorb energy, and restoring the strength of the muscle will help prevent re-injury.