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Background: This is a protocol for a prospective longitudinal study that aims to investigate: (1) group-by-time changes over a minimum of 15 months follow-up in patellofemoral pain (PFP) symptoms, biomechanical, muscle function, pain processing, and psychological features; (2) the extent to which changes in biomechanical, muscle function, pain processing, and psychological features are associated with changes in self-reported pain, physical performance measures, self-reported function, health-related quality of life (HRQOL), and physical activity level. Methods: Individuals with PFP (n = 144) and control individuals (n = 85) without PFP were assessed at baseline. Outcomes assessed included: 3D kinematics and kinetics during single leg squat, step-down and single leg hop; maximal torque and rate of torque development of hip abductors and knee extensors/flexors; force steadiness of hip abductors and knee extensors; anterior and lateral trunk endurance; pressure pain thresholds at the center of patella and contralateral shoulder; kinesiophobia (Tampa Scale for Kinesiophobia); pain catastrophizing (Pain Catastrophizing Scale); worst self-reported pain (Visual Analogue Scale); physical performance measures (Single Leg Hop Test and Forward Step-Down Test); self-reported function (Anterior Knee Pain Scale); HRQOL (Medical Outcome Short-Form 36), and physical activity level (Baecke's Questionnaire). Follow-up assessments will be identical to the baseline and will be performed after a minimum of 15 months. Generalized linear mixed model (GLMM) will be used to investigate group-by-time differences. Linear regression models will be used to determine the extent to which changes in biomechanical, muscle function, pain processing, and psychological features are associated with changes in self-reported pain, physical performance measures, self-reported function, HRQOL, and physical activity level. Discussion: Physical and non-physical features have been previously associated with PFP. However, the present study will be the first to investigate their integrated evolution as part of the natural history of PFP and its progression. In doing so, we will be able to determine their behavior in the long-term, as well as how they prospectively associate with each other and with clinical outcomes. Ultimately, this will provide a greater understanding of predictors of long-term outcome and possible targets for interventions.

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Introdução: A Fisioterapia de Grupo em Circuito de Treinamento (FGCT) é um modelo de terapia para hemiparéticos, mas ainda são necessários mais estudos para avaliar seus efeitos sobre o sistema cardiovascular e a funcionalidade. Objetivo: Avaliar o comportamento cardiovascular e a funcionalidade de hemiparéticos crônicos submetidos à FGCT. Métodos: Estudo transversal, (n = 13), consiste em 10 estações de FGCT. Foi calculada a frequência cardíaca média (FCmed), frequência cardíaca máxima (FCmáx) e classificada a frequência cardíaca de treinamento. Os testes funcionais foram realizados no início da sessão. Foi realizada correlação entre os testes funcionais e as FCmed, FCmáx e a comparação da frequência cardíaca (FC) durante as estações e os intervalos entre elas. Resultados: 92,3% dos voluntários foram classificados como intensidade de treinamento muito leve ou leve. Houve significância estatística entre FCMed da 1ª estação quando comparada com a última (p < 0,01). Conclusão: A intensidade de treinamento de hemiparéticos submetidos à FGCT foi de muito leve a leve, com diferença significante entre a FCmed da 1ª estação quando comparada com a última. Não foi observada correlação da FCmed com a funcionalidade. (AU)

Introduction: Physiotherapy Group in Circuit Training (PGCT) is a model of hemiparetic therapy, but further studies are needed to assess its effects on the cardiovascular system and functionality. Objective: To evaluate the cardiovascular behavior and the functionality of chronic hemiparetics submitted to PGCT. Methods: A cross-sectional study, (n = 13), consists of 10 PGCT stations. Mean heart rate (HRM), maximum heart rate (HRmax) and heart rate of training were calculated. Functional tests were performed at the beginning of the session. A correlation was performed between the functional tests and HRM, HRmax and heart rate (HR) comparison during the seasons and intervals between them. Results: 92.3% of the volunteers were classified as very light or light training intensity. There was statistical significance between HRM of the 1st station when compared with the last station (p < 0.01). Conclusion: The intensity of hemiparetic training submitted to PGCT was very light to light, with a significant difference between the FCmed of the 1st station when compared to the last one. No correlation of HRM with the functionality was observed. (AU)

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OBJECTIVES: To investigate pain level and function limitation in adolescent athletes and physically active non-athletes with PFP. DESIGN: Cross-sectional study. SETTING: Adolescent athletes were recruited at a sport center complex. Adolescent non-athletes were recruited from upper secondary schools. PARTICIPANTS: 108 adolescents diagnosed with PFP: 42 adolescent athletes and 66 adolescent non-athletes. MAIN OUTCOME MEASURES: To evaluate the level of pain, a visual analog scale (VAS) was used and to evaluate the overall function, the Knee Outcome in Osteoarthritis Survey (KOOS) was used. RESULTS: The adolescent athletes scored significantly higher in the VAS (Mean difference = 0.97 (95% CI = 0.35; 1.60) p = 0.003) compared to adolescent non-athletes. Adolescent athletes scored lower in the KOOS - Symptoms, Pain, Knee-related quality of life and Sport and recreation dimensions - than the non-athletes, however, the minimally clinically important difference was not achieved in Pain dimension. There was no significant difference in the Activities of daily living dimension of the KOOS. CONCLUSIONS: Adolescent athletes presented higher levels of pain and lower physical function status compared with physically active non-athletes. This provides an important insight to the management of PFP in adolescent athletes as worst functional status is linked with poor prognosis in patients with PFP.

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