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Performance Limitations (performance + limitation)

Distribution by Scientific Domains

Medical Sciences	60%

Selected Abstracts

Analysis, design, and performance limitations of H, optimal filtering in the presence of an additional input with known frequency

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 16 2007
Ali Saberi
Abstract A generalized ,-level H, sub-optimal input decoupling (SOID) filtering problem is formulated. It is a generalization of ,-level H, SOID filtering problem when, besides an input with unknown statistical properties but with a finite RMS norm, there exists an additional input to the given plant or system. The additional input is a linear combination of sinusoidal signals each of which has an unknown amplitude and phase but known frequency. The analysis, design, and performance limitations of generalized H, optimal filters are presented. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Physical impairment and social adaptation in adult survivors of childhood and adolescent rhabdomyosarcoma: a report from the Childhood Cancer Survivors Study,

PSYCHO-ONCOLOGY, Issue 1 2007
Judith A. Punyko
Abstract Background: Despite interest in the well-being of adult survivors of childhood rhabdomyosarcoma (RMS), few studies have examined their health-related quality of life (HRQOL). This study evaluated physical and social aspects of HRQOL among long-term childhood RMS survivors relative to a sibling comparison group, and assessed whether physical impairment among RMS survivors adversely affected their ability to achieve adult life goals. Methods: Using baseline data from the Childhood Cancer Survivor Study, we evaluated self-reported physical impairment and social adaptation among 417 survivors of childhood RMS and 2685 siblings ,18 years of age at survey completion. Results: Survivors were more likely than siblings to report physical impairment, characterized by: at least one medically diagnosed condition, limitations in the performance of routine activities, a health-related inability to work or attend school, cancer-related pain. Survivors were less likely than siblings to have completed high school, ever worked a job, or ever been married. The odds of completing high school were lower among survivors with performance limitations, a health-related inability to work or attend school, or moderate to high levels of cancer-related pain. Survivors who reported cancer-related pain had an increased likelihood of ever being married. Conclusions: The majority of adult survivors of pediatric RMS are successful in attaining adult life goals despite higher reported occurrence of physical impairment than their sibling counterparts. Additional studies are needed to advance our understanding of other aspects of HRQOL in this population of pediatric cancer survivors. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Physical performance limitations among adult survivors of childhood brain tumors

CANCER, Issue 12 2010
Kirsten K. Ness PhD
Abstract BACKGROUND: Young adult survivors of childhood brain tumors (BTs) may have late effects that compromise physical performance and everyday task participation. The objective of this study was to evaluate muscle strength, fitness, physical performance, and task participation among adult survivors of childhood BTs. METHODS: In-home evaluations and interviews were conducted for 156 participants (54% men). Results on measures of muscle strength, fitness, physical performance, and participation were compared between BT survivors and members of a population-based comparison group by using chi-square statistics and 2-sample t tests. Associations between late effects and physical performance and between physical performance and participation were evaluated in regression models. RESULTS: The median age of BT survivors was 22 years (range, 18-58 years) at the time of the current evaluation, and they had survived for a median of 14.7 years (range, 6.5-45.9 years) postdiagnosis. Survivors had lower estimates of grip strength (women, 24.7 ± 9.2 kg vs 31.5 ± 5.8 kg; men, 39.0 ± 12.2 kg vs 53.0 ± 10.1 kg), knee extension strength (women, 246.6 ± 95.5 Newtons [N] vs 331.5 ± 5.8 N; men, 304.7 ± 116.4 N vs 466.6 ± 92.1 N), and peak oxygen uptake (women, 25.1 ± 8.8 mL/kg per minute vs 31.3 ± 5.1 mL/kg per minute; men, 24.6 ± 9.5 mL/kg per minute vs 33.2 ± 3.4 mL/kg per minute) than members of the population-based comparison group. Physical performance was lower among survivors and was associated with not living independently (odds ratio [OR], 5.0; 95% confidence interval [CI], 2.0-12.2) and not attending college (OR, 2.3; 95% CI 1.2-4.4). CONCLUSIONS: Muscle strength and fitness values among BT survivors were similar to those among individuals aged ,60 years and were associated with physical performance limitations. Physical performance limitations were associated with poor outcomes in home and school environments. The current data indicated an opportunity for interventions targeted at improving long-term physical function in this survivor population. Cancer 2010. © 2010 American Cancer Society. [source]