In addition to being caused by overt muscle damage, muscle pain (myalgia) more often develops from the demand for recurrent isometric muscular contractions involved in repetitive activity.
Characteristically, there is increased ‘muscle tone’, mild to severe pain, tender areas of hypersensitivity to mechanical stimulation in the muscle and spread of this hypersensitivity to surrounding muscles, each of which can affect the performance of synergist muscles.
However, the mechanisms by which acute muscle pain becomes pathological are yet to be understood. One idea relies on changes in muscle spindles, which are highly sensitive stretch receptors located in skeletal muscles throughout the body. Muscle spindles are unusual sensory organs in that they have their own motor innervation – fusimotor motoneurones – which can modulate the sensitivity of muscle spindles to static and dynamic muscle stretch and thereby influence their capacity to encode changes in muscle length and hence the sensory feedback they provide.
Researchers say drinking, smoking and the light from your phone at night can be keeping you awake when you’re trying to sleep. Other bad sleep habits that can affect your sleep include exposure to loud music and eating rich foods within two hours of your bedtime. It might seem obvious but pets in the bed and a lack of exercise […]