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1.
Nurse Educ Today ; 99: 104791, 2021 Apr.
Article in English | MEDLINE | ID: mdl-33540352

ABSTRACT

BACKGROUND: A key element in the provision of safe and competent midwifery care is how learning experiences are construed and translated into practice. This process can be supported through clinical/professional mentoring. What constitutes 'good mentorship' has been the topic of much debate. While research exploring mentorship exists, there is less research exploring co-created perceptions of mentorship by the mentee and mentor. OBJECTIVES: To explore student and registered midwives' co-created perspectives of what matters, what is valued and what is important in mentorship. DESIGN: An adapted Appreciative Inquiry methodology guided this study with thematic analysis used for data analysis. SETTINGS: One regional Australian university. PARTICIPANTS: A convenience sampling, from a population of 39 third-year Bachelor of midwifery students and 39 registered midwives providing clinical supervision for students enrolled in a specific unit of study and concurrently undertaking midwifery practice experience were recruited into this study. METHODS: Following the four-step process of Appreciative Inquiry; Appreciate, Envision, Co-create and Embed, imagery cards were provided, and participants selected the image that resonated with their understanding of mentorship. Shared understandings were cultivated to co-create what worked well and what was valued in facilitating a positive learning experience. RESULTS: Trust developed over time is a valued component of mentorship relationships. Similarly valued is the sense of belonging and feeling safe, elements reliant on the establishment of effective and respectful communication. CONCLUSION: What matters, what is valued and what is important in midwifery mentorship is a mutually respectful relationship between mentee and mentor. This requires time and trust and the creation of a space where the student can develop a sense of professional belonging and feel safe to learn. Further research is needed to explore ways to co-create safe learning environments. Appreciative Inquiry is a method suited to studying this area.


Subject(s)
Mentoring , Midwifery , Students, Nursing , Australia , Communication , Female , Humans , Mentors , Pregnancy , Qualitative Research
2.
Women Birth ; 26(4): 246-53, 2013 Dec.
Article in English | MEDLINE | ID: mdl-24011470

ABSTRACT

BACKGROUND: Smoking prevalence in Aboriginal and Torres Strait Islander pregnant women is quadruple that of non-Indigenous counterparts, impacting on the health of babies and children. AIMS: To explore attitudes and experiences related to prenatal tobacco smoking by Aboriginal women and household smoking, and to provide recommendations for culturally appropriate interventions. METHODS: We conducted five focus groups with clients and family members of a regional NSW Aboriginal maternity service (n=18). Committees, including Aboriginal representatives, oversaw the study. We analysed transcripts with the constant comparative method and developed key categories. FINDINGS: Categories included: social and family influences, knowing and experiencing the health effects of smoking, responses to health messages, cravings and stress, giving up and cutting down, managing smoke-free homes and cars, and community recommendations. Smoking in pregnancy and passive smoking were acknowledged as harmful for babies and children. Anti-tobacco messages and cessation advice appeared more salient when concordant with women's lived experience. Reduced cigarette consumption was reported in pregnancy. Despite smoking in the home, families were engaged in the management of environmental tobacco smoke to reduce harm to babies and children. Abstinence was difficult to initiate or maintain with the widespread use of tobacco in the social and family realm. CONCLUSION: Anti-tobacco messages and interventions should relate to Aboriginal women's experiences, improve understanding of the quitting process, support efficacy, and capitalise on the positive changes occurring in smoke-free home management. Focus group participants recommended individual, group and family approaches, and access to cessation services and nicotine replacement therapy for Aboriginal pregnant women who smoke.


Subject(s)
Health Knowledge, Attitudes, Practice , Native Hawaiian or Other Pacific Islander/psychology , Smoking Cessation/ethnology , Smoking/ethnology , Adolescent , Adult , Culture , Family Characteristics , Female , Focus Groups , Humans , Infant , Male , Middle Aged , Native Hawaiian or Other Pacific Islander/statistics & numerical data , New South Wales , Pregnancy , Qualitative Research , Risk Reduction Behavior , Smoking/adverse effects , Smoking/psychology , Smoking Cessation/methods , Smoking Cessation/psychology , Social Support , Young Adult
3.
Nicotine Tob Res ; 15(5): 863-74, 2013 May.
Article in English | MEDLINE | ID: mdl-23042985

ABSTRACT

INTRODUCTION: Maternal smoking rates in Australian Aboriginal women are triple that of the general population, with little evidence for successful interventions. We reviewed the literature to understand smoking and cessation in Aboriginal and Torres Strait Islander women and provide recommendations for targeted interventions. METHODS: Six databases were searched using terms related to smoking, pregnancy, and Aboriginal Australians. Two reviewers independently assessed papers for inclusion and quality. Meta-ethnography synthesized first- and second-order constructs from included studies and constructed a line of argument. RESULTS: Seven relevant studies were analyzed. The synthesis illustrates 11 third-order constructs operating on the levels of self, family, and social networks, the wider Aboriginal community, and broader external influences. Highlighted are social norms and stressors within the Aboriginal community perpetuating tobacco use; insufficient knowledge of smoking harms; inadequate saliency of antismoking messages; and lack of awareness and use of pharmacotherapy. Indigenous Health Workers have a challenging role, not yet fulfilling its potential. Pregnancy is an opportunity to encourage positive change where a sense of a "protector role" is expressed. CONCLUSIONS: This review gives strength to evidence from individual studies across diverse Indigenous cultures. Pregnant Aboriginal and Torres Strait Islander smokers require comprehensive approaches, which consider the environmental context, increase knowledge of smoking harms and cessation methods, and provide culturally targeted support. Long term, broad strategies should de-normalize smoking in Aboriginal and Torres Strait Islander communities. Further research needs to examine causes of resistance to antitobacco messages, clarify contributing roles of stress and depression, and attitudes to pharmacotherapy.


Subject(s)
Native Hawaiian or Other Pacific Islander , Smoking Cessation/ethnology , Smoking/ethnology , Anthropology, Cultural , Australia/epidemiology , Female , Health Knowledge, Attitudes, Practice , Health Services, Indigenous , Humans , Maternal-Fetal Exchange , Native Hawaiian or Other Pacific Islander/psychology , Pregnancy , Residence Characteristics , Smoking/adverse effects , Smoking/psychology , Smoking Cessation/psychology , Stress, Psychological/therapy
4.
Man Ther ; 17(6): 593-6, 2012 Dec.
Article in English | MEDLINE | ID: mdl-22483781

ABSTRACT

AIM: To assess inter-rater reliability of ankle manual tests. We also correlated the manual tests with the Cumberland Ankle Instability Tool (CAIT). METHOD: One ankle from each of 60 participants was assessed using four different manual tests (anterior drawer in supine and crook lying, talar tilt, inversion tilt). Three different raters, varying in experience, tested each participant. The CAIT questionnaire was also administered. The study received ethics approval from the University of Sydney Human Research Ethics Committee. Intraclass correlation coefficients (ICC), standard error of the mean (SEM) and percent close agreement (PCA) were used to determine reliability of the four tests. Pearson's correlation coefficients were used to determine relationships between the manual tests and CAIT scores. RESULTS: Inter-rater reliability for the four manual tests was poor regardless of therapist's experience (ICC([1,1]) -0.12 to 0.33; SEM 0.93-1.69). Correlations between the CAIT and manual tests were also low varying between r = -0.12 and -0.42. CONCLUSIONS: Inter-rater reliability was poor for manual tests of ankle stability. Reliability may be improved by using a grading scale with fewer intervals. The CAIT scores and manual tests correlated poorly, potentially reflecting the variety of conditions leading to ankle instability.


Subject(s)
Ankle Injuries/classification , Joint Instability/classification , Adolescent , Adult , Female , Humans , Injury Severity Score , Male , Middle Aged , Reproducibility of Results , Surveys and Questionnaires , Young Adult
5.
Am J Sports Med ; 38(7): 1487-97, 2010 Jul.
Article in English | MEDLINE | ID: mdl-20601606

ABSTRACT

BACKGROUND: Generalized joint hypermobility is a highly prevalent condition commonly associated with joint injuries. The current literature has conflicting reports of the risk of joint injury in hypermobile sporting participants compared with their nonhypermobile peers. Systematic reviews have not been conclusive and no meta-analysis has been performed. PURPOSE: This review was undertaken to determine whether individuals with generalized joint hypermobility have an increased risk of lower limb joint injury when undertaking sporting activities. STUDY DESIGN: Systematic review with meta-analysis. METHODS: Studies were identified through a search without language restrictions of PubMed, CINAHL, Embase, and SportDiscus databases from the earliest date through February 2009 with subsequent handsearching of reference lists. Inclusion criteria for studies were determined before searching and all included studies underwent methodological quality assessment by 2 independent reviewers. Meta-analyses for joint injury of the lower limb, knee, and ankle were performed using a random effects model. The difference in injury proportions between hypermobility categories was tested with the z statistic. RESULTS: Of 4841 identified studies, 18 met all inclusion criteria with methodological quality ranging from 1 of 6 to 5 of 6. A variety of tests of hypermobility and varied cutoff points to define the presence of generalized joint hypermobility were used, so the authors determined a standardized cutoff to indicate generalized joint hypermobility. Using this criterion, a significantly increased risk of knee joint injury for hypermobile and extremely hypermobile participants compared with their nonhypermobile peers was demonstrated (P < .001), whereas no increased risk was found for ankle joint injury. For knee joint injury, a combined odds ratio of 4.69 (95% confidence interval, 1.33-16.52; P = .02) was calculated, indicating a significantly increased risk for hypermobile participants playing contact sports. CONCLUSION: Sport participants with generalized joint hypermobility have an increased risk of knee joint injury during contact activities but have no altered risk of ankle joint injury.


Subject(s)
Athletic Injuries/etiology , Joint Instability/complications , Knee Injuries/etiology , Lower Extremity/injuries , Adolescent , Adult , Child , Humans , Male , Risk , Young Adult
6.
Photomed Laser Surg ; 28(1): 3-16, 2010 Feb.
Article in English | MEDLINE | ID: mdl-19708800

ABSTRACT

OBJECTIVES: To assess the clinical effectiveness of Low Level Laser Therapy (LLLT) in the treatment of tendinopathy. Secondary objectives were to determine the relevance of irradiation parameters to outcomes, and the validity of current dosage recommendations for the treatment of tendinopathy. BACKGROUND: LLLT is proposed as a possible treatment for tendon injuries. However, the clinical effectiveness of this modality remains controversial, with limited agreement on the most efficacious dosage and parameter choices. METHOD: The following databases were searched from inception to 1(st) August 2008: MEDLINE, PubMed, CINAHL, AMED, EMBASE, All EBM reviews, PEDro (Physiotherapy Evidence Database), SCOPUS. Controlled clinical trials evaluating LLLT as a primary intervention for any tendinopathy were included in the review. Methodological quality was classified as: high (> or =6 out of 10 on the PEDro scale) or low (<6) to grade the strength of evidence. Accuracy and clinical appropriateness of treatment parameters were assessed using established recommendations and guidelines. RESULTS: Twenty-five controlled clinical trials met the inclusion criteria. There were conflicting findings from multiple trials: 12 showed positive effects and 13 were inconclusive or showed no effect. Dosages used in the 12 positive studies would support the existence of an effective dosage window that closely resembled current recommended guidelines. In two instances where pooling of data was possible, LLLT showed a positive effect size; in studies of lateral epicondylitis that scored > or =6 on the PEDro scale, participants' grip strength was 9.59 kg higher than that of the control group; for participants with Achilles tendinopathy, the effect was 13.6 mm less pain on a 100 mm visual analogue scale. CONCLUSION: LLLT can potentially be effective in treating tendinopathy when recommended dosages are used. The 12 positive studies provide strong evidence that positive outcomes are associated with the use of current dosage recommendations for the treatment of tendinopathy.


Subject(s)
Low-Level Light Therapy/methods , Tendinopathy/radiotherapy , Controlled Clinical Trials as Topic , Humans
7.
J Sci Med Sport ; 13(1): 2-12, 2010 Jan.
Article in English | MEDLINE | ID: mdl-19442581

ABSTRACT

Functional ankle instability (FAI) has been associated with impaired sensorimotor function; however individual studies have produced conflicting results. In an attempt to reduce this ambiguity, a systematic review with meta-analysis was undertaken to determine which sensorimotor deficits exist with FAI. Fifty-three studies assessing sensorimotor factors in subjects with FAI were included from 465 identified articles. Studies were rated for methodological quality and data were pooled for peroneal reaction time, joint position sense, and postural sway during single-leg stance and time to stabilisation from a single-leg jump. Data on joint movement sense were unable to be pooled. When subjects with unstable ankles were compared to healthy controls, sensorimotor impairments were demonstrated for passive joint position sense (mean difference (MD)=0.7 degrees , 95% confidence interval (CI): 0.2-1.2 degrees , p=0.004), active joint position sense (MD=0.6 degrees , 95% CI: 0.2-1.0 degrees , p=0.002), postural sway in single-leg stance (standardised MD (SMD)=0.6, 95% CI: 0.2-1.0, p=0.002), the star excursion balance test (SMD=0.4, 95% CI: 0.1-0.7, p=0.009), and time to stabilisation from a single-leg jump in a medio-lateral (MD=0.6 ms, 95% CI: 0.4-0.8, p<0.0001) and an antero-posterior direction (MD=0.7 ms, 95% CI: 0.4-1.0, p<0.0001). Peroneal reaction time was not affected. Sensorimotor deficits occur for joint position sense and postural control in subjects with FAI. Deficits in peroneal muscle reaction time following perturbation are not evident.


Subject(s)
Ankle Joint/physiopathology , Gait Disorders, Neurologic/physiopathology , Joint Instability/physiopathology , Ankle Injuries/complications , Gait Disorders, Neurologic/etiology , Humans , Joint Instability/etiology , Peroneal Nerve/physiopathology , Peroneal Neuropathies/etiology , Peroneal Neuropathies/physiopathology , Posture , Reaction Time
8.
Man Ther ; 14(6): 596-604, 2009 Dec.
Article in English | MEDLINE | ID: mdl-19729332

ABSTRACT

A systematic review and meta-analysis to determine the effect of age on lumbar range of motion (ROM). Assessment of lumbar ROM is commonly used in spinal clinical examination. Although known to reduce with advancing age, it is unclear how this occurs across different age bands; how this compares between movement planes; and what differences exist between males and females. Ten electronic databases were searched to find studies matching predetermined inclusion criteria. Methodological quality was assessed with a quality assessment tool for quantitative studies. Evidence for effect of age on ROM in all planes was investigated with meta-analyses. Sixteen studies met inclusion criteria with results showing age-related reductions in flexion, extension and lateral flexion particularly from 40 to 50 and after 60 years of age. There was very little age effect on lumbar rotation. There is strong evidence for a non-linear age-related reduction in lumbar sagittal and coronal ROM after 40 years of age that also appears to be asymmetric in the coronal plane. These factors should be considered during the evaluation of spinal ROM in patients who present with lumbar disorders.


Subject(s)
Aging/physiology , Lumbar Vertebrae/physiology , Range of Motion, Articular/physiology , Age Factors , Female , Humans , Male , Sex Factors
9.
Man Ther ; 14(5): 463-74, 2009 Oct.
Article in English | MEDLINE | ID: mdl-19467911

ABSTRACT

A systematic review of randomised controlled trials (RCTs) was conducted to determine the effectiveness of manual therapy (MT) techniques for the management of musculoskeletal disorders of the shoulder. Seven electronic databases were searched up to January 2007, and reference lists of retrieved articles and relevant MT journals were screened. Fourteen RCTs met the inclusion criteria and their methodological qualities were assessed using the PEDro scale. Results were analyzed within diagnostic subgroups (adhesive capsulitis (AC), shoulder impingement syndrome [SIS], non-specific shoulder pain/dysfunction) and a qualitative analysis using levels of evidence to define treatment effectiveness was applied. For SIS, there was no clear evidence to suggest additional benefits of MT to other interventions. MT was not shown to be more effective than other conservative interventions for AC, however, massage and Mobilizations-with-Movement may be useful in comparison to no treatment for short-term outcomes for shoulder dysfunction.


Subject(s)
Musculoskeletal Diseases/rehabilitation , Musculoskeletal Manipulations/methods , Neck Pain/rehabilitation , Randomized Controlled Trials as Topic , Shoulder Pain/rehabilitation , Humans , Musculoskeletal Diseases/complications , Shoulder , Shoulder Impingement Syndrome/rehabilitation , Shoulder Pain/etiology , Treatment Outcome
10.
Photomed Laser Surg ; 26(1): 25-30, 2008 Feb.
Article in English | MEDLINE | ID: mdl-18248158

ABSTRACT

OBJECTIVE: To test the feasibility of a randomized controlled trial to assess the clinical effectiveness of low-level laser therapy (LLLT) when used in addition to eccentric exercise in the management of Achilles tendinopathy. BACKGROUND DATA: LLLT has emerged as a possible treatment modality for tendon injuries. Over the past 20 years only three human studies have investigated LLLT for Achilles tendinopathy. MATERIALS AND METHODS: Twenty patients were randomized into an active laser or placebo group; all patients, therapists, and investigators were blinded to allocation. All patients were given a 12-week eccentric exercise program and irradiated three times per week for 4 wk with either an active or placebo laser at standardized points over the affected tendons. Irradiation parameters in the active treatment group were: 810 nm, 100 mW, applied to six points on the tendon for 30 s, for a total dose of 3 J per point and 18 J per session. Outcome measures were the VISA-A questionnaire, pain, and isokinetic strength. Patients were measured before treatment and at 4 and 12 wk. Analysis of covariance was used to analyze data, using the effects of baseline measurements as a covariate. RESULTS: Within groups, there were significant improvements (p < 0.05) at 4 and 12 wk for all outcome measures, except eccentric strength for the placebo group at 4 wk (p = 0.11). Based on the results of the current study, recruitment of 20 subjects per group would be required to perform an adequately powered study based on minimally important clinical differences in VISA-A scale. CONCLUSION: This study has demonstrated the feasibility of undertaking a randomized controlled trial of LLLT for Achilles tendinopathy. Conclusions regarding effectiveness cannot be made due to the low statistical power of this pilot study.


Subject(s)
Achilles Tendon , Low-Level Light Therapy , Tendinopathy/radiotherapy , Adult , Cohort Studies , Double-Blind Method , Feasibility Studies , Female , Humans , Male , Middle Aged , Pilot Projects , Treatment Outcome
11.
J Sport Rehabil ; 16(2): 131-42, 2007 May.
Article in English | MEDLINE | ID: mdl-17918700

ABSTRACT

CONTEXT: Functional strength measures correlate more closely with functional performance than non-functional strength measures. OBJECTIVES: To determine the reliability of the lateral step test as a measure of maximal strength. DESIGN: Intertester repeated measures. SETTING: Research laboratory. PARTICIPANTS: Twenty four healthy, pain free subjects. INTERVENTION: Two protocols (A and B) were evaluated. The protocols were identical except protocol B involved a three second pause. Participants performed a one repetition maximum (1RM) for each protocol on two occasions separated by one week. MAIN OUTCOME MEASURES: Step height (nearest cm) representing 1RM. RESULTS: Both protocols demonstrated excellent reliability, protocol A: ICC = 0.94 (95% CI, 0.87 to 0.97), SEM = 1.47 cm. Protocol B: ICC= 0.94 (95% CI, 0.85 to 0.97). Percent close agreement within 2 cm was 83.3% for protocol A and 79.1% for protocol B. CONCLUSION: Both protocols demonstrated excellent inter-tester reliability as measures of functional lower limb strength.


Subject(s)
Exercise Test/methods , Lower Extremity/physiology , Muscle Strength/physiology , Adult , Female , Humans , Male , Reproducibility of Results
12.
J Appl Physiol (1985) ; 101(5): 1514-22, 2006 Nov.
Article in English | MEDLINE | ID: mdl-17043329

ABSTRACT

If exercises are performed to increase muscle strength on one side of the body, voluntary strength can increase on the contralateral side. This effect, termed the contralateral strength training effect, is usually measured in homologous muscles. Although known for over a century, most studies have not been designed well enough to show a definitive transfer of strength that could not be explained by factors such as familiarity with the testing. However, an updated meta-analysis of 16 properly controlled studies (range 15-48 training sessions) shows that the size of the contralateral strength training effect is approximately 8% of initial strength or about half the increase in strength of the trained side. This estimate is similar to results of a large, randomized controlled study of training for the elbow flexors (contralateral effect of 7% initial strength or one-quarter of the effect on the trained side). This is likely to reflect increased motoneuron output rather than muscular adaptations, although most methods are insufficiently sensitive to detect small muscle contributions. Two classes of central mechanism are identified. One involves a "spillover" to the control system for the contralateral limb, and the other involves adaptations in the control system for the trained limb that can be accessed by the untrained limb. Cortical, subcortical and spinal levels are all likely to be involved in the "transfer," and none can be excluded with current data. Although the size of the effect is small and may not be clinically significant, study of the phenomenon provides insight into neural mechanisms associated with exercise and training.


Subject(s)
Adaptation, Physiological/physiology , Functional Laterality/physiology , Neuronal Plasticity/physiology , Physical Education and Training , Physical Fitness/physiology , Weight Lifting/physiology , Humans , Meta-Analysis as Topic , Muscle, Skeletal/innervation , Muscle, Skeletal/physiology , Randomized Controlled Trials as Topic
13.
Med Sci Sports Exerc ; 37(9): 1622-6, 2005 Sep.
Article in English | MEDLINE | ID: mdl-16177617

ABSTRACT

PURPOSE: To compare effects on strength in the early phase of resistance training with one or three sets and fast or slow speeds. METHODS: A total of 115 healthy, untrained subjects were randomized to a control group or one of four training groups: one set fast (approximately 140 degrees.s(-1)), three sets fast, one set slow (approximately 50 degrees.s(-1)), or three sets slow. All subjects attended training 3 x wk(-1) for 6 wk. Subjects in the training groups performed unilateral elbow flexion contractions with a target six- to eight-repetition maximum load. Control subjects sat at the training bench but did not train. One repetition maximum strength, arm circumference, and biceps skinfold thickness were measured before and after training. RESULTS: One slow set increased strength by 25% (95% CI 13-36%, P < 0.001). Three sets of training produced greater increases in strength than one set (difference = 23% of initial strength, 95% CI 12-34%, P < 0.001) and fast training resulted in a greater increase in strength than slow training (difference = 11%, 95% CI 0.2-23%, P = 0.046). The interaction between sets and speed was negative (-15%) and of borderline significance (P = 0.052), suggesting there is a benefit of training with three sets or fast speeds, but there is not an additive benefit of training with both. CONCLUSIONS: Three sets of exercise produce twice the strength increase of one set in the early phase of resistance training. Training fast produces greater strength increases than training slow; however, there does not appear to be any additional benefit of training with both three sets and fast contractions.


Subject(s)
Muscle Contraction/physiology , Muscle, Skeletal/physiology , Physical Education and Training/methods , Weight Lifting/physiology , Adaptation, Physiological/physiology , Adult , Arm/anatomy & histology , Arm/physiology , Female , Humans , Male , Skinfold Thickness
14.
J Appl Physiol (1985) ; 99(5): 1880-4, 2005 Nov.
Article in English | MEDLINE | ID: mdl-16024518

ABSTRACT

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.


Subject(s)
Exercise/physiology , Functional Laterality/physiology , Muscle Contraction/physiology , Weight Lifting/physiology , Adolescent , Adult , Elbow/physiology , Female , Humans , Male , Motor Neurons/physiology , Muscle, Skeletal/innervation , Muscle, Skeletal/physiology , Physical Fitness/physiology
15.
Med Sci Sports Exerc ; 35(2): 245-50, 2003 Feb.
Article in English | MEDLINE | ID: mdl-12569212

ABSTRACT

PURPOSE: To investigate muscle strength in subjects with unilateral functional ankle instability, with the specific aim of determining whether eccentric strength deficits exist. METHODS: Isokinetic invertor and evertor torques were assessed eccentrically and concentrically at speeds of 60 and 120 degrees.s(-1) in 16 subjects with unilateral ankle instability. Absolute peak torque values were compared between the injured and noninjured limbs to determine whether strength deficits existed. RESULTS: No eccentric or concentric evertor strength deficit was found in the injured limb. Interestingly, for the injured limb, a significant interaction effect was found whereby eccentric inversion strength was reduced. CONCLUSION: Functional ankle instability is not associated with deficits in evertor strength. Deficits in eccentric invertor strength were found, and this may contribute to the symptoms of functional ankle instability. Weak invertors may contribute to functional ankle instability because of a reduced ability to assist in controlling lateral displacement of the shank over the weight-bearing foot. Excess lateral postural sway outside of the base of support results in the foot's medial border rising from the floor once the limits of closed chain eversion is reached, which may result in the foot being forced into rapid inversion.


Subject(s)
Ankle Injuries/pathology , Joint Instability/pathology , Muscle Weakness/etiology , Sprains and Strains/pathology , Adolescent , Adult , Female , Foot/physiology , Humans , Joint Instability/etiology , Male , Muscle, Skeletal/physiology , Posture , Weight-Bearing
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