Kinematic analysis of the ankle/foot complex mobility of women with PFP during weight bearing functional tests / Análise cinemática da mobilidade do complexo tornozelo/pé de mulheres com DFP durante testes funcionais de descarga de peso

Abstract: Patellofemoral pain (PFP) has been frequently associated with abnormalities in the alignment of the lower limbs and trunk, particularly during weight-bearing activities. In this context, proximal and local factors have been widely discussed. Distal factors could also be involved and need to be investigated in more detail. Our objective was to compare the foot kinematics of the ankle/foot complex in women with pronated feet and patellofemoral pain with the kinematics of asymptomatic women during the execution of anterior and lateral step down tests. Methods: Fifty women were divided into two groups: control (n=16); and patellofemoral pain (n=34). All volunteers were evaluated using three-dimensional motion capture during the forward and lateral step-down tests. For each session, nine repetitions of each clinical test were performed on the most painful limb of the women with PFP and the dominant limb of the women in the control group. The mobility of the ankle/foot complex was measured and the range of motion was calculated for all segments. The two groups were compared using multivariate analysis of variance. Results: Women in the PFP group exhibited less knee flexion and significantly greater mobility of: the hindfoot in relation to the tibia and the laboratory; the forefoot in relation to the tibia; and the forefoot in relation to the hindfoot. Conclusion: Women with PFP exhibited greater mobility of the ankle/foot complex during the anterior and lateral step down tests, when compared with asymptomatic women.

Resumo: Introdução: A dor femoropatelar (DFP) tem sido frequentemente associada a anormalidades no alinhamento dos membros inferiores e tronco, principalmente durante atividades de descarga de peso. Nesse contexto, fatores proximais e locais têm sido amplamente discutidos. Fatores distais também podem estar envolvidos e precisam ser investigados com mais detalhes. Nosso objetivo foi comparar a cinemática do complexo tornozelo/pé em mulheres com pés pronados e dor femoropatelar pormeio de cinemática tridimensional de mulheres assintomáticas durante a execução dos testes step down anterior e lateral. Métodos: Cinquenta mulheres foram divididas em dois grupos: controle (n=16); e dor patelofemoral (n=34). Todos os voluntários foram avaliados usando captura de movimento tridimensional durante os testes step down anterior e lateral. Para cada sessão, foram realizadas nove repetições de cada teste clínico no membro mais doloroso das mulheres com DFP e no membro dominante das mulheres do grupo controle. A mobilidade do complexo tornozelo/pé foi medida e a amplitude de movimento foi calculada para todos os segmentos. Os dois grupos foram comparados por meio de análise multivariada (MANOVA). Resultados: As mulheres do grupo DFP apresentaram menor flexão do joelho e mobilidade significativamente maior de: retropé em relação à tíbia e ao laboratório; do antepé em relação à tíbia; e do antepé em relação ao retropé. Conclusão: Mulheres com DFP apresentaram maior mobilidade do complexo tornozelo/pé durante os testes de step down anterior e lateral, quando comparadas com mulheres assintomáticas.

Female PFP patients present alterations in eccentric muscle activity but not the temporal order of activation of the vastus lateralis muscle during the single leg triple hop test.

This study aimed to compare the concentric and eccentric activity and the temporal order of peak activity of the hip and knee muscles between women with patellofemoral pain (PFP) and healthy women during the single leg triple hop test (SLTHT). Electromyographic (EMG) and Kinematic data were collected from 14 healthy women (CG) and 14 women diagnosed with PFP (PFG) during a single session of the single leg triple hop test. Integral surface electromyography (iEMG) data of the hip and knee muscles in eccentric and concentric phases and the length of time that each muscle needed to reach the maximal peak of muscle activity were calculated. The iEMG in the eccentric phase was significantly higher (p < 0.05) than the concentric phase, for the gluteus maximus and gluteus medius muscles (CG and PFG) and for the vastus lateralis muscle (PFG). The vastus lateralis muscle was the first muscle to reach the highest peak of activity in the PFG, and the third to reach this peak in the CG. In the present study, the activity of the vastus lateralis muscle during the eccentric phase of the jump was greater than concentric phase, as a temporal anticipation of its peak in activity among women with PFP.

Adding motor control training to muscle strengthening did not substantially improve the effects on clinical or kinematic outcomes in women with patellofemoral pain: A randomised controlled trial.

DESIGN: Randomized controlled trial. BACKGROUND: Patients with Patellofemoral pain (PFP) usually present muscular weakness, pain and impaired motor control. Muscle strengthening is an effective treatment strategy for PFP, but the additional benefits of movement control training remain unknown. Therefore, the aim of this study was to compare the effects of movement control training associated with muscle strengthening, with a conventional program of strengthening alone in women with PFP. METHODS: Thirty-four women were randomly assigned to two groups. The Strengthening group (S group) performed 12 sessions to strengthen the knee and hip muscles. The Movement Control & Strengthening group (MC&S group) performed the same exercises and movement control training of the trunk and lower limbs. Effects of the treatment (i.e., between-group differences) were calculated using linear mixed models. Primary outcomes were function and pain intensity after completion of the treatment protocol. Secondary outcomes were; muscle strength and kinematic outcomes during the step down task after 4 weeks of treatment; and function and pain intensity 3 and 6 months after randomization. RESULTS: The MC&S group did not present significantly better function (MD -2.5 points, 95% CI;-10.7-5.5) or pain (MD -0.3 points, 95% CI;-1.7-1.0) at 4 weeks. There was a small difference in favour of the MC&S group for AKPS scores at 3 months (MD -8.5 points; 95% CI;-16.8 to -0.3). No significant between-group differences were observed for the other outcomes. CONCLUSION: Movement control training was no more effective than the isolated strengthening protocol, in terms of pain, function, muscle strength, or kinematics.

THE EFFECTS OF VARIED TENSIONS OF KINESIOLOGY TAPING ON QUADRICEPS STRENGTH AND LOWER LIMB FUNCTION.

BACKGROUND: Kinesiology Taping (KT) may promote changes in muscle strength and motor performance, topics of great interest in the sports-medicine sciences. These characteristics are purported to be associated with the tension generated by the KT on the skin. However, the most suitable tension for the attainment of these strength and performance effects has not yet been confirmed. HYPOTHESIS/PURPOSE: The purpose of the present study was to analyze the effects of different tensions of KT on the isometric contraction of the quadriceps and lower limb function of healthy individuals over a period of seven days. STUDY DESIGN: Blind, randomized, clinical trial. METHODS: One hundred and thirty healthy individuals were distributed into the following five groups: control (without KT); KT0 (KT without tension); KT50; KT75 and KT100 (approximately 50%, 75% and 100% tension applied to the tape, respectively). Assessments of isometric quadriceps strength were conducted using a hand held dynamometer. Lower limb function was assessed through Single Hop Test for Distance, with five measurement periods: baseline; immediately after KT application; three days after KT; five days after KT; and 72h after KT removal (follow-up). RESULTS: There were no statistically significant differences (p > 0.05) at any of the studied periods on participants' quadriceps strength nor in the function of the lower dominant limb, based on comparisons between the control group and the experimental groups. CONCLUSION: KT applied with different tensions did not produce modulations, in short or long-term, on quadriceps' strength or lower limb function of healthy individuals. Therefore, this type of KT application, when seeking these objectives, should be reconsidered. LEVEL OF EVIDENCE: 1b.

Kinematic and electromyographic analysis in patients with patellofemoral pain syndrome during single leg triple hop test.

Possible delays in pre-activation or deficiencies in the activity of the dynamic muscle stabilizers of the knee and hip joints are the most common causes of the patellofemoral pain syndrome (PFPS). The aim of the study was to compare kinematic variables and electromyographic activity of the vastus lateralis, biceps femoris, gluteus maximus and gluteus medius muscles between patients with PFPS and health subjects during the single leg triple hop test (SLTHT). This study included 14 female with PFPS (PFPS group) and 14 female healthy with no history of knee pain (Healthy group). Kinematic and EMG data ware collected through participants performed a single session of the SLTHT. The PFPS group exhibited a significant increase (p<0.05) in the EMG activity of the biceps femoris and vastus lateralis muscles, when compared with the healthy group in pre-activity and during the stance phase. This same result was also found for the vastus lateralis muscle (p<0.05) when analyzing the EMG activity during the eccentric phase of the stance phase. In kinematic analysis, no significant differences were found between the groups. These results indicate that biceps femoris and vastus lateralis muscles mainly during the pre-activation phase and stance phases of the SLTHT are more active in PFPS group among healthy group.

Exercises with partial vascular occlusion in patients with knee osteoarthritis: a randomized clinical trial.

PURPOSE: The objective of this study was to evaluate whether women with knee osteoarthritis performing a rehabilitation programme consisting of low-load exercises combined with PVO exhibited the same results in changes in quadriceps strength, pain relief, and functional improvement when compared to women receiving a programme consisting of high-load exercises without PVO. METHODS: Thirty-four women (mean age, 61 years) with a diagnosis of knee osteoarthritis were randomly assigned to a conventional or occlusion group. The women in the conventional group (n = 17) performed a 6-week quadriceps strengthening and stretching programme using a load around 70 % of the 1-repetition maximum (RM). The women in the occlusion group (n = 17) performed the same programme, however, only using a load around 30 % of the 1-RM, while PVO was induced. The PVO was achieved using a pressure cuff applied to the upper third of the thigh and inflated to 200 mmHg during the quadriceps exercise. An 11-point Numerical Pain Rating Scale (NPRS), the Lequesne questionnaire, the Timed-Up and Go (TUG) test, and muscle strength measurement using a hand-held dynamometer were used as outcome measures at baseline (pretreatment) and at the end of the 6-week of treatment. Pain, using the NPRS, was also assessed when performing the quadriceps exercises during the exercise sessions. RESULTS: At baseline, demographic, strength, pain, and functional assessment data were similar between groups. Patients from both the conventional and occlusion groups had a higher level of function (Lequesne and TUG test), less pain (NPRS), and higher quadriceps strength at the 6-week evaluation when compared to baseline (all P < 0.05). However, the between-group analysis showed no differences for all outcomes variables at posttreatment (n.s.). Patients in the occlusion group experienced less anterior knee discomfort during the treatment sessions than those in the high-load exercise group (P < 0.05). CONCLUSION: A rehabilitation programme that combined PVO to low-load exercise resulted in similar benefits in pain, function, and quadriceps strength than a programme using high-load conventional exercise in patients with knee osteoarthritis. However, the use of PVO combined with low-load exercise resulted in less anterior knee pain during the training sessions. LEVEL OF EVIDENCE: I.

Kinematic and Kinetic Analysis of the Single-Leg Triple Hop Test in Women With and Without Patellofemoral Pain.

STUDY DESIGN: Cross-sectional study. OBJECTIVES: To compare the biomechanical strategies of the trunk and lower extremity during the transition period between the first and second hop of a single-leg triple hop test in women with and without patellofemoral pain (PFP). BACKGROUND: Recent literature has shown that PFP is associated with biomechanical impairments of the lower extremities. A number of studies have analyzed the position of the trunk and lower extremities for functional activities such as walking, squatting, jumping, and the step-down test. However, studies on more challenging activities, such as the single-leg triple hop test, may be more representative of sports requiring jumping movements. METHODS: Women between 18 and 35 years of age (control group, n = 20; PFP group, n = 20) participated in the study. Three-dimensional kinematic and kinetic data were collected during the transition period between the first and second hops while participants performed the single-leg triple hop test. RESULTS: Compared to the control group, women with PFP exhibited greater (P<.05) anterior and ipsilateral trunk lean, contralateral pelvic drop, hip internal rotation and adduction, and ankle eversion, while exhibiting less hip and knee flexion. A significant difference (P<.05) in time to peak joint angle was also found between groups for all the variables analyzed, except anterior pelvic tilt and hip flexion. In addition, women with PFP exhibited greater (P<.05) hip and knee abductor internal moments. CONCLUSION: Compared to the control group, women with PFP exhibited altered trunk, pelvis, hip, knee, and ankle kinematics and kinetics.

Neuromuscular training and muscle strengthening in patients with patellofemoral pain syndrome: a protocol of randomized controlled trial.

BACKGROUND: Patellofemoral pain syndrome (PFPS) is a common musculoskeletal condition, particularly among women. Patients with PFPS usually experience weakness in the gluteal muscles, as well as pain and impaired motor control during activities of daily living. Strengthening the hip muscles is an effective way of treating this disorder. Neuromuscular training has also been identified as a therapeutic tool, although the benefits of this intervention in patients with PFPS patients remain inconclusive. DESIGN: This is a protocol of randomized controlled trial with a blind assessor. Thirty-four women with a clinical diagnosis of PFPS participated. These participants were allocated into two groups (experimental and control). The experimental group performed twelve sessions to strengthen the knee extensors, hip abductor and lateral rotator muscles in association with neuromuscular training of the trunk and lower extremities. The control group performed the same number of sessions to strengthen the muscles of the hip and knee. The primary outcome was functional capacity (Anterior Knee Pain Scale - AKPS) at 4 weeks. Pain intensity, muscle strength and kinematic changes were also measured during the step down test after four weeks of intervention. Follow up assessments were conducted after three and six months to assess functional capacity and pain. The effects of the treatment (i.e. between-group differences) were calculated using mixed linear models. DISCUSSION: The present study was initiated on the 1st of April 2013 and is currently in progress. The results of this study may introduce another effective technique of conservative treatment and could guide physical therapists in the clinical decision-making process for women with PFPS. TRIAL REGISTRATION: Current Controlled Trials NCT01804608.

Propulsion phase of the single leg triple hop test in women with patellofemoral pain syndrome: a biomechanical study.

Asymmetry in the alignment of the lower limbs during weight-bearing activities is associated with patellofemoral pain syndrome (PFPS), caused by an increase in patellofemoral (PF) joint stress. High neuromuscular demands are placed on the lower limb during the propulsion phase of the single leg triple hop test (SLTHT), which may influence biomechanical behavior. The aim of the present cross-sectional study was to compare kinematic, kinetic and muscle activity in the trunk and lower limb during propulsion in the SLTHT using women with PFPS and pain free controls. The following measurements were made using 20 women with PFPS and 20 controls during propulsion in the SLTHT: kinematics of the trunk, pelvis, hip, and knee; kinetics of the hip, knee and ankle; and muscle activation of the gluteus maximus (GM), gluteus medius (GMed), biceps femoris (BF) and vastus lateralis (VL). Differences between groups were calculated using three separate sets of multivariate analysis of variance for kinematics, kinetics, and electromyographic data. Women with PFPS exhibited ipsilateral trunk lean; greater trunk flexion; greater contralateral pelvic drop; greater hip adduction and internal rotation; greater ankle pronation; greater internal hip abductor and ankle supinator moments; lower internal hip, knee and ankle extensor moments; and greater GM, GMed, BL, and VL muscle activity. The results of the present study are related to abnormal movement patterns in women with PFPS. We speculated that these findings constitute strategies to control a deficient dynamic alignment of the trunk and lower limb and to avoid PF pain. However, the greater BF and VL activity and the extensor pattern found for the hip, knee, and ankle of women with PFPS may contribute to increased PF stress.

Índice de incapacitação das lombalgias em motoristas de caminhão / Disability index of low back pain in truck drivers

INTRODUÇÃO: As lombalgias são causas de morbidade e incapacidade na realização de atividades de vida diária. Motoristas de caminhão apresentam risco aumentado de desenvolvimento da lombalgia em razão das demandas mecânico-posturais características da profissão. OBJETIVO: Investigar o nível de interferência das lombalgias nas atividades de vida diária de motoristas de caminhão. MÉTODOS: Foi realizado um estudo transversal, no qual foram entrevistados 30 motoristas de caminhão, do sexo masculino, com idade entre 25 e 35 anos e com mais de cinco anos de experiência na profissão. Apenas os indivíduos que referiram dor lombar crônica, persistente há mais de três meses, foram instruídos a responder o questionário sobre o índice de incapacitação de Oswestry para dor lombar, com intuito de classificar os níveis de interferência das lombalgias nas atividades de vida diária. RESULTADOS: Vinte e nove motoristas de caminhão atenderam aos critérios de inclusão do estudo (média de idade 31,83±3,63 anos, tempo de experiência 8,93±2,4 anos e média de 13,66±2,47 horas diárias de trabalho). Vinte e dois motoristas (75,86%) apresentavam incapacidade mínima (score 8,45±6,58) e sete (24,14%), incapacidade moderada (score 27,14±6,3). CONCLUSÃO: Apenas 24,14% da amostra estudada apresentou incapacidade moderada, interferindo assim na realização de atividades de vida diária, tais como: problemas ao sentar, levantar peso e ficar de pé.

INTRODUCTION: Low back pain leads the morbidity and disability in performing daily living activities. Truck drivers have high risks to developing low back pain due to postural and mechanical characteristics of the profession. OBJECTIVE: To investigate the low back pain interference level in daily living activities of the truck drivers. METHODS: This is a cross-sectional studythat recruited 30 truck drivers, male, aged between 25 and 35 years old and more than five years of experience in this profession. Only individuals with chronic low back pain (at least three months), were instructed to answer the Oswestry disability index questionnaire, to classify the low back pain interference levels in daily activities. RESULTS: Twenty-ninetruck drivers were included (mean age 31.83±3.63 years, meanexperience 8.93±2.4 years and a mean daily work 13.66±2.47 hours). Twenty-two truck drivers (75.86%) showed minimal disability (score 8.45±6.58) and seven (24.14%), moderate disability (score 27.14±6.3). CONCLUSION: Only 24.14% of the sample showed moderate disability, that can be interfering in the daily living activities performance of the truck drivers, such as; problems when sitting, lifting and standing up.

Efeitos da oclusão vascular parcial no ganho de força muscular / The effects of partial vascular occlusion on gaining muscle strength

Objetivo: Investigar os efeitos do exercício resistido de baixa intensidade associado à oclusão vascular no ganho de força e volume muscular. Método: Foi realizada uma busca sistematizada nos bancos de dados eletrônicos: Science Direct, PEDro e Pubmed, onde foram revisados somente ensaios clínicos randomizados e com pontuação acima de 50% de acordo com a escala de PEDro. Resultados: Durante a pesquisa foram pré-selecionados e analisados 440 artigos e ao final da seleção, sete artigos preencheram todos os critérios de inclusão e especificações estabelecidas. Conclusão: Conclui-se que o exercício de baixa intensidade com oclusão sanguínea é uma alternativa eficaz na indução de hipertrofia muscular, sendo vista como uma nova possibilidade de treinamento muscular orientado para jovens e idosos saudáveis. No entanto, há necessidade de realizar novos estudos, pois ainda existem pontos que permanecem sem explicação, como dor e desconforto durante o treinamento.

Objective: To investigate the effects of low-intensity resistance exercise associated with vascular occlusion in strength and muscle volume. Method: We performed a systematic review in electronic databases: Science Direct, PEDro, and Pubmed, in which were reviewed only randomized clinical trials with a score over 50% according to the PEDro scale. Results: During the survey 440 articles were pre-selected and reviewed, but in the final selection only seven articles met all inclusion criteria and specifications set. Conclusion: We conclude that low-intensity exercise with blood occlusion is an effective alternative in inducing muscle hypertrophy and is seen as a new possibility of targeted muscle training for young people and seniors. However, we need more studies, for there are still points that remain unclear, such as pain and discomfort during training.