The Time-dependent Changes in EMG Recorded from the Medial Gastrocnemius of Young and Elderly Amputees
نویسندگان
چکیده
[Purpose] Dysfunction of lower extremity muscles is one risk factor of falls for amputee patients. However, the change in muscle activity pattern and balance ability of amputees who have no experience in standing with prosthesis during the period from prosthesis fitting to regaining the ability to walk has never been studied. Therefore, the objectives of the present study were to elucidate changes over time in the muscle activity pattern and walking speed from first prosthesis fitting to hospital discharge. We also investigated the differences of muscle activity during standing between younger and elderly amputee patients. [Methods] Electromyography measurements were performed on the gastrocnemius of the intact leg during standing. The test subjects were asked to shift their center of gravity forward. [Results] Two unique patterns of gastrocnemius activities were observed over time. In a younger patient, the amount of muscular activity of the gastrocnemius gradually increased over time. In an elderly patient, however, the amount of muscular activity of gastrocnemius gradually decreased over time. [Conclusion] The time-dependent changes in gastrocnemius muscle activities are indicative postural control ability. Therefore, understanding the time-dependent changes in muscle activities during rehabilitation and the differences of postural control between younger and elderly patients would contribute to the development of effective rehabilitation programs for each patient.
منابع مشابه
Comparison of The Effectiveness of Traditional and Post-Activation Potentiation Warm-Up Methods on EMG Variables of Selected Lower Limb Muscles During Squat Jump
Purpose: A proper warm-up method can be used as a strategy to improve performance of athletes in various sport fields. The aim of present study was to compare the effect of two traditional and post-activation potentiation warm-up methods on electromyographic variables of lower extremity muscles during squat jump. Methods: Fourteen trained male athletes were randomly performed three different p...
متن کاملPrediction of Above-elbow Motions in Amputees, based on Electromyographic(EMG) Signals, Using Nonlinear Autoregressive Exogenous (NARX) Model
Introduction In order to improve the quality of life of amputees, biomechatronic researchers and biomedical engineers have been trying to use a combination of various techniques to provide suitable rehabilitation systems. Diverse biomedical signals, acquired from a specialized organ or cell system, e.g., the nervous system, are the driving force for the whole system. Electromyography(EMG), as a...
متن کاملبررسی زمانبندی و سطح فعالیت الکتریکی عضلات اطراف مفصل زانو در الگوهای حرکتی فعال و واکنشی در مردان سالم
New studies in neuromuscular control have indicated that the strength of muscle contraction isn’t the only important factor in a task. But the speed at which a muscle responds, preparation of muscle and synergistic pattern at which a group of muscles recruit to a task or respond to a condition are much more important in constant joint stabilization and potential injury prevention. The purpo...
متن کاملMotor Unit Number Estimation in Normal and Parkinsonism Model of Medial Gastrocnemius Muscle in Rats
Motor units (MUs) reflect the function of the central nervous motor system. Thus, the estimated MU number is a good option to investigate the functional movement disorder in the Parkinson’s disease (PD). The purpose of this study was to compare the estimated MUs number in the medial gastrocnemius (MG) muscle of the normal rats and those with the Parkinsonism. The MG muscle of two age-matche...
متن کاملFeedforward and Feedback Function of Selected Lower Limb Muscles Following Plyometric Exercises and Cryotherapy
Purpose: Despite the widespread use of cryotherapy in sports fields there is a lack of certain evidence of its impact of it on muscle activation especially following fatigue-induced exercise. This study aimed to assess the impact of cryotherapy alone and after plyometric exercises on knee muscle activation during the drop jump task. Method: 35 active female subjects (mean age of 22.74±2.10, m...
متن کامل