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The purpose of this study was to explore the relationship between grip strength and inter-muscular coordination of the forearms and hands. Twenty-four healthy young volunteers participated in the experiment. The subjects were instructed to grip hydraulic hand dynamometer with five force levels-maximal voluntary contraction (MVC), 70% MVC, 50% MVC, 30% MVC and without any contraction. Muscle activity...
The thumb and index finger are important digits to performed dexterous and complex manipulation of objects. However, the local muscle fatigue will induce the capacity of force production and impair the precision motor control of the thumb and index finger. This study focused on the exercise-induced local muscle fatigue influencing the COP (center of pressure) area, the SD and the PA (projection angle)...
In this study, we aimed to recognize six hand motions using surface electromyogram (sEMG) signals recorded from eight muscles of the right hand. Twenty-five healthy subjects participated in this experiment. Data were segmented using windows of 250-ms length with a 150-ms overlapping. In this paper, we extracted 24 features per muscle. Three feature sets-the original features, the features produced...
The purpose of this study was to investigate changes of the maximal reaching distance (MRD) and the amplitude of electromyography (EMG) in lower limbs during reaching forward (RF) test with outstretched arm in the elderly. Ten healthy elderly subjects and ten healthy young subjects participated in this study. A position sensor was used to record the position coordinates of fingertip, and the EMG signals...
The standing balance undergoes declines with aging that contributes the fall of the elderly. But the age-related balance control during quiet standing upon a slope has not been fully understood. This study aimed to investigate the effects of aging on muscle activation during quiet standing on a slope with different angles. Sixteen healthy young subjects and 16 healthy elderly subjects participated...
In this paper, we aimed to investigate the difference between the surface electromyogram (sEMG) signals recorded from the right hand and left hand by means of the statistical analysis of the root mean square (RMS). Twenty-five healthy subjects participated in this experiment. For the entail 19 s recorded data of every repetition, we selected a window length of 250 ms data start from the beginning...
Patients with stroke usually have abnormal gait during walking. A hallmark of the post-stroke gait is the decreased knee flexion on the paretic leg compared to the non-paretic side. The objective of this study was to investigate the muscle contractions that are potentially responsible for the asymmetry of knee flexion in post-stroke patient. Ten stroke patients and 10 age- and sex-matched healthy...
The purpose of this study is to investigate the effects of carpal tunnel syndrome on hand intrinsic muscle activities using surface electromyogram (sEMG) during precision grip. Six CTS patients and six age- and gender-matched healthy volunteers participated in the experiment. The subjects were instructed to stably grip an instrumented apparatus with their thumb and index finger for 80 s. The sEMG...
Recurrence quantification analysis (RQA) was used to analyze signals of sustained sub-maximal grip contraction (SSGC) of healthy subjects across several age groups. Recurrence plots (RP) of elderly subject showed clear periodic pattern combined with disrupted features in some parts, in comparison to control subjects who displayed quasi-periodic patterns. Quantitative analysis of the RP showed significant...
Grip force measurement is routinely used to identify pathologies, evaluate muscular function, and as part of rehabilitation. Grip force has also been shown to be a good indicator of the capacity of elderly to live independently owing to its strong relationship with clinical tests such as the Index of Activities of Daily Living. An autonomous, communicant grip-force measurement device is presented...
Muscle fatigue and physiological tremor during a Sustained Maximal Grip Contraction (SMGC) were analyzed using Empirical Mode Decomposition (EMD) in this study. Thirty-nine healthy subjects volunteered for the experiment and performed a 25-s SMGC. Fatigue parameters such as the relative power output (RPO) were calculated from the residual of SMGC after applying EMD. Using the energy spectrum of the...
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