The muscle's increase active force grows until it reaches its maximum length before falling. The length at which the heart typically beats is at this maximal point.
For a muscle cell to contract, the sarcomere must shorten. However, the thick and thin filaments that make up sarcomeres do not get any shorter. Instead, they move past each other, shrinking the sarcomere but maintaining the original length of the filaments.
There is a perfect distance between sarcomeres where the tension in the muscle fiber is highest and the force of contraction is greatest. There will be a decrease in contraction tension and strength if sarcomeres are located either closer together or farther apart than this ideal length.
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