Relationships between muscle strength and multi-channel surface EMG parameters in eighty-eight elderly

Background

Since age-related muscle strength loss cannot be explained solely by muscle atrophy, other determinants would also contribute to muscle strength in elderly. The present study aimed to clarify contribution of neuromuscular activation pattern to muscle strength in elderly group. From 88 elderlies (age: 61~?83 years), multi-channel surface electromyography (EMG) of the vastus lateralis muscle was recorded with two-dimensional 64 electrodes during isometric submaximal ramp-up knee extension to assess neuromuscular activation pattern. Correlation analysis and stepwise regression analysis were performed between muscle strength and the parameters for signal amplitude and spatial distribution pattern, i.e., root mean square (RMS), correlation coefficient, and modified entropy of multi-channel surface EMG.

Results

There was a significant correlation between muscle strength and RMS (r =?0.361, p =?0.001) in the elderly. Muscle thickness (r =?0.519, p <?0.001), RMS (r =?0.288, p?=?0.001), and normalized RMS (r =?0.177, p =?0.047) were selected as major determinants of muscle strength in stepwise regression analysis (r?=?0.664 in the selected model).

Conclusion

These results suggest that inter-individual difference in muscle strength in elderly can be partly explained by surface EMG amplitude. We concluded that neuromuscular activation pattern is also major determinants of muscle strength on elderly in addition to indicator of muscle volume.

     

网络经济中反垄断法的定位:“放任”与“干预”的博弈

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依托太行山红色文化推进大学生社会主义核心价值观教育

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The Role of <Emphasis Type="Italic">New Zealand Sociology</Emphasis> in Developing New Zealand Sociology

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美丽乡村建设中图书馆总分馆发展策略探析

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Experiences,Burdens, and Support Needs in Siblings of Girls and Women with Anorexia Nervosa: Results from a Qualitative Interview Study

For many years, siblings of women and girls suffering from anorexia have been regarded as “the forgotten kin,” as they have been overlooked by both researchers and clinicians. Therefore, the goal of this explorative study was to investigate siblings’ experiences, burdens, and support needs in a differentiated manner. Siblings (n = 16) of patients with an ICD-10 diagnosis “anorexia nervosa” (F 50.0) took part in a qualitative, in-depth interview study; the data were assessed using content analysis. The results of this study should be especially interesting for clinical social work. Using the findings, a variety of concrete recommendations for psycho-social practice can be made, for example regarding the inclusion of siblings in treatment settings, as well as specific support concepts for siblings of anorexic women and girls in different age groups.     

The Effects of Merit-Based Scholarships on Educational Outcomes

This paper analyzes the effect of a statewide merit-based scholarship program on educational outcomes in Arizona. It tests whether Arizona’s Instrument to Measure Standards (AIMS) scholarship has an effect on a comprehensive set of educational outcomes such as the number of applicants, student admissions, first-year first-time enrollment, ACT scores of entering freshman, retention rates, as well as on the level of tuition and fees at the three schools targeted by the program; Arizona State University, University of Arizona and Northern Arizona University. Both difference-in-differences estimation as well as synthetic control methods shows that AIMS has an economically and statistically significant effect enrollment. Enrollment effects are greatest among African American and Hispanic students and are significant for both men and women. While point estimates suggest that AIMS also lead to increases in tuition and fees, these results are not robust to placebo tests.     

Remittances as an Insurance Mechanism in the Labor Market

The probability that Mexican households receive remittances increases in response to temporary loss of employment by household heads. Evidence indicates that the probability doubles in the short-term, with a stronger effect in the first quarter of unemployment. Taking into account inter-household transfers within Mexico, the increase in the probability of private transfers is similar in households with low and high access to migratory networks in the U. S. The effectiveness of private transfers as an insurance mechanism has been reduced in an environment of economic crisis.     

Judging Facial Emotion Expressions in Context: The Influence of Culture and Self-Construal Orientation

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