Rehab Centers: On the Efficiency of FES Cycling: A Framework and Systematic Review.
On the efficiency of FES cycling: A framework and systematic review.
Filed under: Rehab Centers
Technol Health Care. 2012 Jan 1; 20(5): 395-422
Hunt KJ, Fang J, Saengsuwan J, Grob M, Laubacher M
Research and development in the art of cycling using functional electrical stimulation (FES) of the paralysed leg muscles has been going on for around thirty years. A range of physiological benefits has been observed in clinical studies but an outstanding problem with FES-cycling is that efficiency and power output are very low. The present work had the following aims: (i) to provide a tutorial introduction to a novel framework and methods of estimation of metabolic efficiency using example data sets, and to propose benchmark measures for evaluating FES-cycling performance; (ii) to systematically review the literature pertaining specifically to the metabolic efficiency of FES-cycling, to analyse the observations and possible explanations for the low efficiency, and to pose hypotheses for future studies which aim to improve performance. We recommend the following as benchmark measures for assessment of the performance of FES-cycling: (i) total work efficiency, delta efficiency and stimulation cost; (ii) we recommend, further, that these benchmark measures be complemented by mechanical measures of maximum power output, sustainable steady-state power output and endurance. Performance assessments should be carried out at a well-defined operating point, i.e. under conditions of well controlled work rate and cadence, because these variables have a strong effect on energy expenditure. Future work should focus on the two main factors which affect FES-cycling performance, namely: (i) unfavourable biomechanics, i.e. crude recruitment of muscle groups, non-optimal timing of muscle activation, and lack of synergistic and antagonistic joint control; (ii) non-physiological recruitment of muscle fibres, i.e. mixed recruitment of fibres of different type and deterministic constant-frequency stimulation. We hypothesise that the following areas may bring better FES-cycling performance: (i) study of alternative stimulation strategies for muscle activation including irregular stimulation patterns (e.g. doublets, triplets, stochastic patterns) and variable frequency stimulation trains, where it appears that increasing frequency over time may be profitable; (ii) study of better timing parameters for the stimulated muscle groups, and addition of more muscle groups: this path may be approached using EMG studies and constrained numerical optimisation employing dynamic models; (iii) development of optimal stimulation protocols for muscle reconditioning and FES-cycle training.
HubMed – rehab
Genetic polymorphism of interleukin 1? -511C/T and susceptibility to sporadic Alzheimer’s disease: a meta-analysis.
Filed under: Rehab Centers
Mol Biol Rep. 2012 Oct 19;
Yuan H, Xia Q, Ge P, Wu S
A large number of epidemiological studies have been performed to investigate the association between Alzheimer’s disease (AD) risk and interleukin-1? -511C/T genetic polymorphism, however, inconsistent results have been reported. The effect of the IL-1? -511C/T polymorphism on AD susceptibility was evaluated by a meta-analysis. Series of databases were researched. 14 studies involving 2640 AD case and 3493 control subjects were identified. The pooled results showed there were no statistical associations of interleukin-1? -511C/T genetic polymorphism with susceptibility to AD for five analysis models in all subjects. However, obvious heterogeneity among studies was detected. When stratifying for age at onset, ethnicity and geographic distribution of population to explore the original source of heterogeneity, the meta-analysis results based on geographic distribution of population showed the significant difference (CC vs CT, OR 1.26, 95 % CI: 1.03, 1.54, z = 2.25, P = 0.025; CC vs CT+TT, OR 1.24, 95 % CI: 1.03, 1.50, z = 2.24, P = 0.025) only in non-Europe. These findings indicate that the IL-1? -511C/T polymorphism might be associated with AD risk, and individuals with IL-1? -511C/C genotype might be at higher risk of AD in non-Europe. Further larger sample research would be warranted to confirm these conclusions.
HubMed – rehab
Pruritus in Adult Burn Survivors: Postburn Prevalence and Risk Factors Associated With Increased Intensity.
Filed under: Rehab Centers
J Burn Care Res. 2012 Oct 17;
Carrougher GJ, Martinez EM, McMullen KS, Fauerbach JA, Holavanahalli RK, Herndon DN, Wiechman SA, Engrav LH, Gibran NS
Pruritus (itching) is a common and distressing complaint after injury. The purpose of this study was to investigate self-reported postburn pruritus in a large, multisite cohort study of adult burn survivors. Descriptive statistics, general linear regression, and mixed model repeated measures analyses were employed to test statistical significance. Two cohorts of adult burn survivors were studied. Group 1 participants (n = 637) were injured from 2006 to 2010 and were followed up prospectively for 2 years from the time of injury. Prevalence and severity of pruritus were compared across multiple subgroups. Prevalence of pruritus at discharge, 6, 12, and 24 months following injury were 93, 86, 83, and 73%, respectively. Regression results established that %TBSA-burn and %TBSA-grafted were correlated to itch intensity values. Group 2 participants (n = 336) were injured 4 to 10 years before an assessment using the validated 5-D Itch Scale.Many patients (44.4%) reported itching in the area of the burn, graft, or donor site. Within this group, 76% reported itching for <6 hours/day, and 52 and 29% considered itch intensity to be mild or moderate, respectively. This study confirms that the prevalence of burn pruritus is high, initially affecting >90% and persisting for >40% of long-term burn survivors. New predictors for postburn itch were identified to include younger age, dry skin, and raised/thick scars. Characterization of the impact of postburn pruritus on leisure, vocation, and sleep are quantified for those long-term survivors suffering from postburn pruritus.
HubMed – rehab
Management of post-keratoplasty astigmatism.
Filed under: Rehab Centers
J Cataract Refract Surg. 2012 Nov; 38(11): 2029-39
Fares U, Sarhan AR, Dua HS
Post-keratoplasty astigmatism remains a challenge for corneorefractive surgeons. While maintaining a healthy graft is the most crucial issue in keratoplasty procedures, astigmatism is a limiting factor in the visual rehabilitation of otherwise successful corneal grafts. The management of post-keratoplasty astigmatism takes place at 2 stages: when sutures are still present at the graft-host junction and when all sutures have been removed. Excessive suture-in post-keratoplasty astigmatism is usually managed by selective suture manipulation, ie, suture adjustment and/or suture removal along the steep meridian of astigmatism. A small amount of suture-out post-keratoplasty astigmatism can be managed by spectacles. Higher magnitudes of astigmatism can be addressed by contact lenses or surgical intervention, such as relaxing and compressing procedures. Laser lamellar refractive surgery can also be used to manage post-keratoplasty astigmatism, and toric phakic intraocular lenses have recently been recommended. In this review, we discuss the etiology and management of post-keratoplasty astigmatism and provide recommendations and tips to minimize it. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
HubMed – rehab
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