Six-Minute Walk Test as a Measure of Walking Capacity in Ambulatory Individuals With Amyotrophic Lateral Sclerosis.

OBJECTIVE: To determine the validity of the 6-minute walk test (6MWT) as an outcome measure to evaluate walking capacity in ambulatory patients with amyotrophic lateral sclerosis (ALS). DESIGN: Observational study. SETTING: Multidisciplinary ALS clinic at an academic medical center. PARTICIPANTS: Patients with ALS (N=186) who ambulate without (stage I) or with (stage II) an assistive device. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: Walking distance obtained from the 6MWT. RESULTS: Participants performed the 6MWT, 25-foot walk test (25FWT), Timed Up and Go (TUG) test, lower extremity maximum voluntary isometric contraction (MVIC), ALS Functional Rating Scale-Revised (ALSFRS-R), and forced vital capacity (FVC). Walking capacity was reduced to 66% predicted of healthy subjects (75.2%±22% in stage I; 42.6%±22% in stage II). The 6MWT correlated with all other outcome measures in ambulatory patients with ALS (25FWT: r=-.74, P≤.0001; TUG test: r=-.80, P≤.0001; MVIC: r=.64, P≤.0001; percent predicted FVC: r=.25, P≤.0007; ALSFRS-R: r=.52, P≤.0001; ALSFRS-R gross motor subscore: r=.71, P≤.0001). When ambulatory patients with ALS were stratified by stage of ambulation, the 6MWT was associated with all other outcome measures in stage I (25FWT: r=-.56, P≤.0001; TUG test: r=-.66, P≤.0001; MVIC: r=.51, P≤.0001; percent predicted FVC: r=.40, P≤.02; ALSFRS-R: r=.52, P≤.0001; ALSFRS-R gross motor subscore: r=.61, P≤.0001). In stage II, the 6MWT correlated with the 25FWT (r=-.83, P≤.0001), TUG test (r=-.77, P≤.0001), MVIC (r=.47, P≤.0001), and ALSFRS gross motor subscore (r=.61, P≤.0001), but not with percent predicted FVC (r=.09, P≤.513) or ALSFRS-R (r=.21, P≤.141). CONCLUSIONS: The 6MWT is a valid measure of walking capacity of ambulatory patients with ALS that is associated with measures of lower extremity muscle strength and function in both stages of ambulation. The discordance between the 6MWT with the ALSFRS-R and percent predicted FVC in stage II ambulatory patients with ALS indicates that the 6MWT is an independent measure of ambulatory function in both stages of ambulation. The 6MWT may provide a quantitative, simple, and inexpensive outcome measure of walking capacity for early stage clinical trials in ambulatory patients with ALS.

Vestibular deficits leading to disequilibrium and falls in ambulatory amyotrophic lateral sclerosis.

OBJECTIVE: To assess vestibular deficits in response to disequilibrium in ambulatory individuals with amyotrophic lateral sclerosis (ambALS). DESIGN: All participants completed standard protocols for the Sensory Organization Test (SOT) by computerized dynamic posturography. SETTING: Multidisciplinary amyotrophic lateral sclerosis clinic at an academic medical center. PARTICIPANTS: Study participants (N=34) consisted of ambALS (n=19) and healthy controls (HC) (n=15). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Equilibrium scores (ESs) obtained from averaged sway amplitude in condition 5 (ES5) and condition 6 (ES6) of the SOT. RESULTS: In conditions of altered somatosensory information with vision absent or vision sway-referenced, the mean ± SD scores for ambALS (ES5=51.4±22.5; ES6=50.8±22.1) were lower than those for HC (ES5=65.4±11.7, P≤.03; ES6=58.9±12.5, P>.05). Seven ambALS (37%) experienced a total of 19 falls during the sway-referenced support test conditions. There were no falls in the HC. CONCLUSIONS: Nearly 37% of ambALS with normal clinical balance testing have decreased ability to use the vestibular input and required increased reliance on visual input for postural orientation to sustain equilibrium. The mechanism of this alteration in sensory preference is not completely clear. Extrapyramidal involvement early in ALS may be indicated.

Comparison of coronary artery calcification scores and National Cholesterol Education program guidelines for coronary heart disease risk assessment and treatment paradigms in individuals with chronic traumatic spinal cord injury.

OBJECTIVE: To investigate the risk of coronary heart disease (CHD) in individuals with spinal cord injury (SCI) according to the National Cholesterol Educational Program (NCEP) guidelines and CT coronary artery calcium scores (CCS). RESEARCH: Cross-sectional study of consecutive sample of males with SCI presenting to a single site for CHD risk assessment. PARTICIPANTS/METHODS: Males age 45-70 with traumatic SCI (American Spinal Injury Association (ASIA) A, B, and C) injured for at least 10 years with no prior history of clinical CHD. Medical history, blood-pressure, and fasting lipid panel were used to calculate risk for CHD with the use of the Framingham risk score (FRS). Risk and treatment eligibility status was assessed based on NCEP/FRS recommendations and by presence and amount of CCS. Percent agreement (PA) and kappa were calculated between the two algorithms. Spearman correlations were calculated between CCS and FRS and individual risk factors. RESULTS: A total of 38 men were assessed; 18 (47.4%) had CCS > 0. The PA between NCEP/FRS assessment and CCS was 18% with a kappa of -0.03. 11 (28.9%) had CCS > 100 or >75th percentile for their age, sex, and race, which might qualify them for lipid-lowering treatment. Only 26 were placed into the same treatment category by NCEP/FRS and CCS, for a PA of 68% with a kappa of 0.35. In all, 20 (52.6%) were eligible for lipid-lowering treatment by either NCEP/FRS (n=9) or CCS (n = 11). Seven subjects were above the treatment threshold based on CCS, but not NCEP/FRS and five subjects were above the NCEP/FRS threshold, but not CCS. Just four subjects were eligible by both algorithms. CCS only correlated with FRS (r = 0.508, P = 0.001) and age (r = 0.679, P < 0.001).

Adherence with the National Cholesterol Education Program guidelines in men with chronic spinal cord injury.

OBJECTIVE: Describe the management of dyslipidemia and adherence to the National Cholesterol Educational Program (NCEP) guidelines in men with Spinal Cord Injury (SCI). RESEARCH: Cross-sectional study of a consecutive sample of men with SCI presenting to a single site for coronary heart disease (CHD) risk assessment. PARTICIPANTS/METHODS: Men age 45 to 70 with traumatic SCI (ASIA A, B, and C) at least 10 years prior to participation in the study with no prior history of clinical CHD. Medical history, blood-pressure, and fasting lipid panel were used to calculate risk for CHD using NCEP guidelines and the Framingham Risk Score (FRS). Adherence to treatment recommendations and adequacy of control were assessed based on the NCEP guidelines. RESULTS: 38 men were assessed; 15/38 (39.5%, 95% CI: 24.0-56.6%) had dyslipidemia, defined as an LDL-C above their LDL-C treatment threshold (n=6) or being on treatment for dyslipidemia (n=9, for a 60% treatment rate (9/15, 95% CI: 32.3-83.7%)). Of the 9 individuals on treatment, 6 (66.7%) met their treatment goals (for a 40% overall control rate (6/15, 95% CI: 16.3-67.7%)). Dyslipidemia was well controlled in low risk individuals, but control was less common in higher risk individuals. CONCLUSIONS: Dyslipidemia is common in men age 45-70 with chronic SCI and no evidence of clinical cardiovascular disease. Rates of treatment and control of dyslipidemia in this population are far from optimal, especially among the intermediate- and high-risk groups.

Supported treadmill ambulation for amyotrophic lateral sclerosis: a pilot study.

OBJECTIVES: To determine the feasibility, tolerability, safety, and exercise treatment-effect size of repetitive rhythmic exercise mediated by supported treadmill ambulation training (STAT) for patients with amyotrophic lateral sclerosis (ALS). DESIGN: Interventional with repeated-measures design. SETTING: Multidisciplinary ALS clinic at academic medical center. PARTICIPANTS: Convenience sample of patients with ALS (N=9) who were ambulatory with assistive devices (Sinaki-Mulder stages II-III). INTERVENTIONS: Repetitive rhythmic exercise-STAT (30min total; 5min of exercise intercalated with 5min of rest) performed 3 times a week for 8 weeks. MAIN OUTCOME MEASURE: ALS Functional Rating Scale-Revised (ALSFRS-R), percentage of predicted vital capacity (VC), total lower-extremities manual muscle test (MMT), rate of perceived exertion (RPE), Fatigue Severity Scale (FSS), and maximum voluntary isometric contraction (MVIC) in 10 lower and 10 upper extremities. Gait performance, which included walking distance, speed, steps, and stride length, was evaluated during treadmill and ground 6-minute walk tests (6MWTs) and 25-foot walk test (25FWT). RESULTS: Feasibility issues decreased screened participants by 4 patients (31%). Nine patients were enrolled, but 6 patients (67%) completed the study and 3 (23% of original cohort; 33% of enrolled cohort) could not complete the exercise intervention because of non-ALS-related medical problems. Tolerability of the intervention measures during the treadmill 6MWT showed improvement in RPE (P≤.05) and FSS score (P≥.05). Safety measures (ALSFRS-R, VC, MMT) showed no decrease and showed statistical improvement in ALSFRS-R score (P≤.05) during the study interval. Exercise treatment-effect size showed variable improvements. Gait speed, distance, and stride length during the treadmill 6MWT improved significantly (P≤.05) after 4 weeks and improvements were maintained after 8 weeks compared with baseline. Walking distance during the ground 6MWT increased significantly after 4 weeks and was maintained after 8 weeks compared with baseline (P≤.05). Walking speed during the 25FWT and lower-extremity MVIC improved, but were not statistically significant. CONCLUSIONS: Repetitive rhythmic exercise-STAT is feasible, tolerated, and safe for patients with ALS. Repetitive rhythmic exercise-STAT treatment-effect size across a number of ALS-related measures was consistent with improved work capacity and gait function in patients with ALS who are dependent on assistive devices for ambulation. Repetitive rhythmic exercise-STAT should be evaluated further in larger studies to determine the stability of this improved function in relation to the rate of progression of the underlying ALS.

Cardiovascular health and fitness in persons with spinal cord injury.

There are many issues after spinal cord injury that have an impact on cardiovascular health and fitness. This article discusses many of the secondary conditions and changes that occur and how they are affected by maintenance of an active lifestyle. It also discusses many of the benefits and difficulties individuals face in maintaining a regular exercise program after spinal cord injury.

Reliability of the physical medicine and rehabilitation resident observation and competency assessment tool: a multi-institution study.

OBJECTIVES: To assess the psychometric qualities of a method of resident physician evaluation by faculty. DESIGN: Multicenter study by seven Physical Medicine and Rehabilitation training programs. Faculty physicians observed residents in brief patient encounters or teaching sessions, rated specific competencies, and provided residents with immediate feedback. The resident observation and competency assessment form included competencies in patient care, professionalism, interpersonal and communication skills, systems-based practice, and practice-based learning and improvement. Residents and faculty rated satisfaction with the process. RESULTS: Three hundred sixty-two ratings were completed on 88 different residents. Each resident received an average of 3.8 ratings across two academic years. Overall internal consistency reliability was high (0.98); reliability of the individual competencies ranged from 0.74 to 0.76. Item means were correlated with year of training for two skill sets, with higher means for more experienced residents. The majority of participants gave high ratings of satisfaction; correlation between satisfaction ratings of attending and resident physicians was 0.63 (P < 0.01). CONCLUSIONS: The resident observation and competency assessment is a reliable method to assess resident skills in five of six general competencies. Construct validity of the tool is supported by the fact that faculty rated two skill sets higher for senior residents.

Assessment of primary care services and perceived barriers to care in persons with disabilities.

OBJECTIVE: To determine what percentage of persons with disabilities have a primary care provider, participate in routine screening and health maintenance examinations, and identify perceived physical or physician barriers to receiving care. DESIGN: A total of 344 surveys, consisting of 66 questions, were collected from adults with disabilities receiving care at an outpatient rehabilitation clinic. RESULTS: A total of 89.5% (95% CI 86.3%-92.8%) of participants reported having a primary care physician. Younger persons (P < 0.0001), men (P < 0.02), persons with brain injury (P < 0.05), or persons with amputations (P < 0.05) were less likely to have a primary care physician. Participant report of screening for alcohol, nonprescription drug use, and safety with relationships at home ranged from 26.6% to 37.5% compared with screening for depression, diet, exercise, and smoking (64.5%-70%). Completion rates of age- and gender-appropriate health maintenance examinations ranged from 42.4% to 90%. A total of 2.67% of participants reported problems with physical access at their physician's office, and 36.4% (95% CI 30.8%-42.1%) of participants reported having to teach their primary care physician about their disability. CONCLUSIONS: Most persons with disabilities have a primary care physician. In general, completion rates for routine screening and health maintenance examinations were high. Perceived deficits in primary care physicians' knowledge of disability issues seem more prevalent than physical barriers to care.