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Biomedical subjects

Robert D Herbert

Publications and source records attributed to Robert D Herbert.

16 recordsLinked to original sources
PubMed2005

Training with unilateral resistance exercise increases contralateral strength.

Evidence that unilateral training increases contralateral strength is inconsistent, possibly because existing studies have design limitations such as lack of control groups, lack of randomization, and insufficient statistical power. This study sought to determine whether unilateral resistance training increases contralateral strength. Subjects (n = 115) were randomly assigned to a control group or one of the following four training groups that performed supervised elbow flexion contractions: 1) one set at high speed, 2) one set at low speed, 3) three sets at high speed, or 4) three sets at low speed. Training was 3 times/wk for 6 wk with a six- to eight-repetition maximum load. Control subjects attended sessions but did not exercise. Elbow flexor strength was measured with a one-repetition maximum arm curl before and after training. Training with one set at slow speed did not produce an increase in contralateral strength (mean effect of -1% or -0.07 kg; 95% confidence interval: -0.42-0.28 kg; P = 0.68). However, three sets increased strength of the untrained arm by a mean of 7% of initial strength (additional mean effect of 0.41 kg; 95% confidence interval: 0.06-0.75 kg; P = 0.022). There was a tendency for training with fast contractions to produce a greater increase in contralateral strength than slow training (additional mean effect of 5% or 0.31 kg; 95% confidence interval: -0.03-0.66 kg; P = 0.08), but there was no interaction between the number of sets and training speed. We conclude that three sets of unilateral resistance exercise produce small contralateral increases in strength.

Adolescent↗
PubMed2005

Passive stretching does not enhance outcomes in patients with plantarflexion contracture after cast immobilization for ankle fracture: a randomized controlled trial.

OBJECTIVE: To compare the efficacy of short- and long-duration passive stretches with a control treatment for the management of plantarflexion contracture after cast immobilization for ankle fracture. DESIGN: Assessor-blinded, randomized controlled trial. SETTING: Hospital physical therapy outpatient departments. PARTICIPANTS: Adults with plantarflexion contracture (N=150) after cast immobilization for ankle fracture. All subjects were weight bearing or partial weight bearing. INTERVENTIONS: Exercise only, exercise plus short-duration passive stretch, and exercise plus long-duration passive stretch. All subjects had a 4-week course of exercises. In addition, subjects in the short-duration stretch plus exercise group completed 6 minutes of stretching per day, and subjects in the long-duration stretch plus exercise group completed 30 minutes of stretching per day. MAIN OUTCOME MEASURES: Lower Extremity Functional Scale and passive dorsiflexion range of motion with the knee bent and straight at baseline, and at 4 weeks and 3 months postintervention. RESULTS: One hundred thirty-nine (93%) subjects completed the 4-week assessment and 134 (89%) subjects completed the 3-month assessment. There were no statistically significant or clinically important between-group differences for the primary outcomes. CONCLUSIONS: The addition of passive stretching confers no benefit over exercise alone for the treatment of plantarflexion contracture after cast immobilization for ankle fracture.

Adult↗
PubMed2005

Searching the LILACS database for Portuguese- and Spanish-language randomized trials in physiotherapy was difficult.

OBJECTIVE: Evidence-based practice requires access to systematic reviews and randomized controlled trials; however, most literature databases index primarily English-language journals. We sought to determine the extent and quality of Portuguese- and Spanish-language reports of randomized trials relevant to physiotherapy by searching the LILACS database (Literatura Latino Americana e do Caribe em Ciências da Saúde). A secondary aim was to compare the sensitivity of three strategies for searching for Portuguese- and Spanish-language randomized trials in physiotherapy. STUDY DESIGN AND SETTING: The LILACS database was searched for randomized trials using three search strategies. RESULTS: Three search strategies returned 5,262 records, of which only 47 were randomized trials. Most trials reported treatments for pain or cardiopulmonary disease, and most were of moderate to high quality. The sensitivity of the three search strategies varied from 2% to 53%. CONCLUSION: A small number of moderate- to high-quality randomized trials in physiotherapy are published in Spanish and Portuguese languages, but they are difficult to find.

Bibliometrics↗
PubMed2004

A randomized controlled trial of weight-bearing versus non-weight-bearing exercise for improving physical ability after usual care for hip fracture.

OBJECTIVE: To compare the effects of weight-bearing and non-weight-bearing home exercise programs and a control program on physical ability (strength, balance, gait, functional performance) in older people who have had a hip fracture. DESIGN: Randomized controlled trial with 4-month follow-up. SETTING: Australian community-dwellers (82%) and residents of aged care facilities who had completed usual care after a fall-related hip fracture. PARTICIPANTS: One hundred twenty older people entered the trial, 40 per group (average age +/- standard deviation, 79+/-9y) and 90% completed the 4-month retest. INTERVENTION: Home exercise prescribed by a physical therapist. MAIN OUTCOME MEASURES: Strength, balance, gait, and functional performance. RESULTS: At the 4-month retest, there were differences between the groups in the extent of improvement since the initial assessment for balance (F(10,196)=2.82, P<.001) and functional performance (F(6,200)=3.57, P<.001), but not for strength (F(12,190)=1.09, P=.37) or gait (F(8,200)=.39, P=.92). The weight-bearing exercise group showed the greatest improvements in measures of balance and functional performance (between-group differences of 30%-40% of initial values). CONCLUSIONS: A weight-bearing home exercise program can improve balance and functional ability to a greater extent than a non-weight-bearing program or no intervention among older people who have completed usual care after a fall-related hip fracture.

Activities of Daily Living↗
PubMed2004

Challenges for evidence-based physical therapy: accessing and interpreting high-quality evidence on therapy.

Although there is a growing awareness of evidence-based practice among physical therapists, implementation of evidence-based practice has proved difficult. This article discusses barriers to access and interpretation of evidence. Some solutions are offered, including facilitating the publication of all research, use of an optimum format for reporting research, maximizing the efficient use of electronic databases, improving physical therapists' skills in critical appraisal of published research, and fostering consumer access to evidence. These strategies and others discussed in the article might facilitate implementation of evidence-based physical therapy.

Evidence-Based Medicine↗
PubMed2003

Acute low back pain: systematic review of its prognosis.

OBJECTIVES: To describe the course of acute low back pain and sciatica and to identify clinically important prognostic factors for these conditions. DESIGN: Systematic review. DATA SOURCES: Searches of Medline, Embase, Cinahl, and Science Citation Index and iterative searches of bibliographies. MAIN OUTCOME MEASURES: Pain, disability, and return to work. RESULTS: 15 studies of variable methodological quality were included. Rapid improvements in pain (mean reduction 58% of initial scores), disability (58%), and return to work (82% of those initially off work) occurred in one month. Further improvement was apparent until about three months. Thereafter levels for pain, disability, and return to work remained almost constant. 73% of patients had at least one recurrence within 12 months. CONCLUSIONS: People with acute low back pain and associated disability usually improve rapidly within weeks. None the less, pain and disability are typically ongoing, and recurrences are common.

Acute Disease↗
PubMed2003

A randomised trial of weight-bearing versus non-weight-bearing exercise for improving physical ability in inpatients after hip fracture.

The purpose of this study was to assess the effects of weight-bearing and non-weight-bearing exercise on strength, balance, gait and functional performance among older inpatients following hip fracture. Eighty people (mean age 81 years, SD 8) undergoing inpatient rehabilitation after fall-related hip fracture were randomised to receive two-week programs of either weight-bearing or non-weight-bearing exercise prescribed by a physiotherapist. Both groups improved markedly (in the order of 50%) on measures of physical ability. Overall there was little difference between groups in the extent of improvement, however post hoc testing identified some additional strength benefits for the non-weight-bearing group--non-affected leg hip flexion mean difference in extent of improvement was 9.3 N (95% CI 3.7 to 15.0), non-affected leg hip abduction mean difference in extent of improvement was 6.5 N (95% CI 0.1 to 12.9). There were also additional functional benefits for the weight-bearing group--improved ability to complete a lateral step-up on the affected leg with nil or one hand supports (OR 3.4, 95% CI 1.1 to 12.3) and the need for less supportive walking aids (p = 0.045). Weight-bearing and non-weight-bearing exercise programs produce similar effects on strength, balance, gait and functional performance among inpatients soon after hip fracture.

Accidental Falls↗
PubMed2003

Randomised trial of the effects of four weeks of daily stretch on extensibility of hamstring muscles in people with spinal cord injuries.

The aim of this assessor-blind randomised controlled trial was to determine the effect of four weeks of 30 minute stretches each weekday on extensibility of the hamstring muscles in people with recent spinal cord injuries. A consecutive sample of 16 spinal cord-injured patients with no or minimal voluntary motor power in the lower limbs and insufficient hamstring muscle extensibility to enable optimal long sitting were recruited. Subjects' legs were randomly allocated to experimental and control conditions. The hamstring muscles of the experimental leg of each subject were stretched with a 30 Nm torque at the hip for 30 minutes each weekday for four weeks. The hamstring muscles of the contralateral leg were not stretched during this period. Extensibility of the hamstring muscles (hip flexion range of motion with knee extended, measured with a 48 Nm torque at the hip) of both legs was measured by a blinded assessor at the commencement of the study and one day after the completion of the four-week stretch period. Changes in hamstring muscle extensibility from initial to final measurements were calculated. The effect of stretching was expressed as the mean difference in these changes between stretched and non-stretched legs. The mean effect of stretching was 1 degree (95% CI -2 to 5 degrees). Four weeks of 30 minute stretches each weekday does not affect the extensibility of the hamstring muscle in people with spinal cord injuries.

Adaptation, Physiological↗
PubMed2003

Reliability of the PEDro scale for rating quality of randomized controlled trials.

BACKGROUND AND PURPOSE: Assessment of the quality of randomized controlled trials (RCTs) is common practice in systematic reviews. However, the reliability of data obtained with most quality assessment scales has not been established. This report describes 2 studies designed to investigate the reliability of data obtained with the Physiotherapy Evidence Database (PEDro) scale developed to rate the quality of RCTs evaluating physical therapist interventions. METHOD: In the first study, 11 raters independently rated 25 RCTs randomly selected from the PEDro database. In the second study, 2 raters rated 120 RCTs randomly selected from the PEDro database, and disagreements were resolved by a third rater; this generated a set of individual rater and consensus ratings. The process was repeated by independent raters to create a second set of individual and consensus ratings. Reliability of ratings of PEDro scale items was calculated using multirater kappas, and reliability of the total (summed) score was calculated using intraclass correlation coefficients (ICC [1,1]). RESULTS: The kappa value for each of the 11 items ranged from.36 to.80 for individual assessors and from.50 to.79 for consensus ratings generated by groups of 2 or 3 raters. The ICC for the total score was.56 (95% confidence interval=.47-.65) for ratings by individuals, and the ICC for consensus ratings was.68 (95% confidence interval=.57-.76). DISCUSSION AND CONCLUSION: The reliability of ratings of PEDro scale items varied from "fair" to "substantial," and the reliability of the total PEDro score was "fair" to "good."

Databases, Bibliographic↗
PubMed2002

Evidence for physiotherapy practice: a survey of the Physiotherapy Evidence Database (PEDro).

Evidence-based practice involves the use of evidence from systematic reviews and randomised controlled trials, but the extent of this evidence in physiotherapy has not previously been surveyed. The aim of this survey is to describe the quantity and quality of randomised controlled trials and the quantity of systematic reviews relevant to physiotherapy. The Physiotherapy Evidence Database (PEDro) was searched. The quality of trials was assessed with the PEDro scale. The search identified a total of 2,376 randomised controlled trials and 332 systematic reviews. The first trial was published in 1955 and the first review was published in 1982. Since that time, the number of trials and reviews has grown exponentially. The mean PEDro quality score has increased from 2.8 in trials published between 1955 and 1959 to 5.0 for trials published between 1995 and 1999. There is a substantial body of evidence about the effects of physiotherapy. However, there remains scope for improvements in the quality of the conduct and reporting of clinical trials.

Australia↗
PubMed2000

How to estimate treatment effects from reports of clinical trials. II: Dichotomous outcomes.

This paper, the second in a series of two, discusses how readers of clinical trials can extract simple estimates of treatment effect size from trial reports when trial outcomes are measured on a dichtomous scale. A method is given to quantify the degree of uncertainty of these estimates. Estimates of treatment effect size can be adjusted on the basis of baseline risk to determine the probability that treatment will help a particular patient. The probability that the treatment will be helpful should be weighed against the costs and risks of the treatment.

Journal Article↗
PubMed2000

How to estimate treatment effects from reports of clinical trials. I: Continuous outcomes.

Properly conducted randomised trials can aid clinical decision-making by providing unbiased estimates of the average size of treatment effects. This paper, the first of two, discusses how readers of clinical trials can extract simple estimates of treatment effect size from trial reports when trial outcomes are measured on a continuous scale. When making decisions about therapy for individual patients, these estimates can be modified on the basis of patient characteristics. Modified estimates of treatment effect size can be used to determine if the effect of treatment is likely to be large enough to be "clinically worthwhile". This approach optimises clinical decision-making by combining unbiased estimates of the size of treatment effect from clinical trials with clinical intuition and patient preferences.

Journal Article↗
PubMedDate not supplied

Effectiveness of different types of foot orthoses for the treatment of plantar fasciitis.

Clinicians often use foot orthoses to manage the symptoms of plantar fasciitis. Although there has been considerable research evaluating the effectiveness of orthoses for this condition, there is still a lack of scientific evidence that is of suitable quality to fully inform clinical practice. Randomized controlled trials are recognized as the "gold standard" when evaluating the effectiveness of treatments. We discuss why randomized controlled trials are so important, the features of a well-conducted randomized controlled trial, and some of the problems that arise when trial design is not sound. We then evaluate the available evidence for the use of foot orthoses, with particular focus on published randomized controlled trials. From the evidence to date, it seems that foot orthoses do have a role in the management of plantar fasciitis and that prefabricated orthoses are a worthwhile initial management strategy. At this time, however, it is not possible to recommend either prefabricated or customized orthoses as being better, and it cannot be inferred that customized orthoses are more effective over time and therefore have a cost advantage. Additional good-quality randomized controlled trials are needed to answer these questions.

Evidence-Based Medicine↗