The body has hundreds of muscles of various types—slow twitch, fast twitch, skeletal, smooth and cardiac, to name a few. Muscles provide their power by contracting and relaxing, thereby generating a force that causes movement. Running muscles require a strong anchor (where one end of the muscle attaches to a bone or ligament) and the other end of the muscle connects to the flexible part of the limb. When that muscle contracts or shortens, movement of the joint is produced.
The science behind this muscle contraction and relaxation is very complex. It involves proteins called actin and myosin, along with various other elements including calcium, potassium, sodium and water. This is why it is so important to supply the fuel (water, electrolytes, etc.) for the muscles to work while you are training. Continue reading “Muscle Strains”