Accelerated muscle fatigability of latent myofascial trigger points in humans.
نویسندگان
چکیده
OBJECTIVE Muscle fatigue is prevalent in acute and chronic musculoskeletal pain conditions in which myofascial trigger points (MTPs) are involved. The aim of this study was to investigate the association of latent MTPs with muscle fatigue. DESIGN Intramuscular electromyographic (EMG) recordings were obtained from latent MTPs and non-MTPs together with surface EMG recordings from the upper trapezius muscles during sustained isometric muscle contractions in 12 healthy subjects. OUTCOME MEASURES Normalized root mean square (RMS) EMG amplitude and mean power frequency (MNF) were analyzed. The rate of perceived exertion and pain intensity from MTP side and non-MTP side were recorded. RESULTS Pain intensity on the MTP side was significantly higher than the non-MTP side (P < 0.05). Intramuscular EMG from latent MTPs showed an early onset of decrease in MNF and a significant decrease at the end of fatiguing contraction as compared with non-MTPs (P < 0.05). Surface EMG from muscle fibers close to latent MTPs presented with an early onset of the increase in RMS amplitude and the increase was significantly higher than that from non-MTPs at the end of sustained isometric contraction (P < 0.05). CONCLUSIONS A latent MTP is associated with an accelerated development of muscle fatigue and simultaneously overloading active motor units close to an MTP. Elimination of latent MTPs and inactivation of active MTPs may effectively reduce accelerated muscle fatigue and prevent overload spreading within a muscle.
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Background and Objectives: Muscles are known as organs which can generate pain in human body. Among different types of muscle pain, myofascial trigger points (MTPs) are very common. The aim of this study was comparing the effect of shockwave therapy (SWT) and low level laser therapy (LLLT) on the treatment of the MTPs of trapezius muscles. Materials and Methods: This randomized clinical trial ...
متن کاملبررسی تأثیر نقطۀ ماشهای فعال عضلۀ تراپزیوس فوقانی روی فعالیت الکترومیوگرافی و حداکثر نیروی این عضله حین انجام اسکاپشن در دو گروه با و بدون نقطۀ ماشهای
Objective: Trigger points may result in referral pain of their close areas. Recent evidence suggests that latent trigger points although they are not sensitive enough to cause pain, can interfere with the normal muscle function. These myofascial trigger points are estimated as an electro-physiological phenomenon. However, there are a few studies which investigated the effect of these points on ...
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ورودعنوان ژورنال:
- Pain medicine
دوره 13 7 شماره
صفحات -
تاریخ انتشار 2012