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“Time-dependent-strain means that if you tug on the ligament abruptly the ligament is strong and stiff and holds its length, but if you put even a very light load on a ligament over a long time period (e.g. an hour, or over night) the ligament stretches and lengthens and can potentially stay like that for some time after the load is removed. The consequence is that you have a joint that is operating ineffectively and this may lead to an acute injury while playing sport for example as the joint is not functioning effectively. It can also lead to excess muscle tension as the muscles need to over-work in order to hold the joint firmly through its range of movement in the way that the ligament would be doing if it were at its healthy length and operating like a firm hinge.

How does this situation happen? The trouble usually begins during rest.”
― Jax Pax, How Yoga Really Works