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.
Blood vessels leading to the muscles dilate to allow easier access to oxygen. Blood pressure drops due to blood vessel dilation. Exercise causes body temperature to rise, stimulating the blood vessels in the skin to dilate, allowing blood to flow there more easily and help get rid of excess heat.As muscle activity is sustained, the sympathetic system is stimulated to cause vasoconstriction once again, News-Medical.net notes.xercise stimulates vasoconstriction and vasodilation responses in the body to facilitate oxygen delivery to the muscles. This also keeps blood vessels healthy because it prevents the accumulation of cholesterol and substances that potentially compromise function.