No abstract

Street running is an accessible, low-cost form of exercise. However, the occurrence of musculoskeletal injuries may hinder regular practice. This study aimed at estimating the prevalence of injuries in Brazilian street runners and the associated factors. A meta-analysis of Brazilian studies was performed to investigate the prevalence and risk factors of injuries in male and female recreational street runners aged ≥18 years. We excluded systematic review studies, research conducted on professional athletes or triathletes, and duplicate articles. The following databases were used: SciELO, LILACS, PubMed, Web of Science, and Google Scholar. Keywords such as “prevalence,” “injury,” “recreational street runners,” and “Brazil” were used. Prevalence analysis was performed using the random effect model, and a funnel plot was used to assess publication bias. Then the Begg-Mazumdar and Egger tests were applied to quantify the graph results. The Prevalence Critical Appraisal Instrument was used to evaluate the methodological quality of the studies. Associated factors were analyzed with meta-regression analysis. Twenty-three studies with 3,786 runners were included in the review. The prevalence of injury was 36.5% (95% confidence interval [CI] 30.8-42.5%), and a running distance per week greater than 20 km was a predictive variable of injuries. A higher prevalence of injuries was observed in men than in women (28.3%, 95% CI 22.5-35.0%), the knee was the most affected site of injury (32.9%, 95% CI 26.7-39.6%), and muscle injuries were the most frequent type of injury (27.9%, 95% CI 18.2-40.1%). This is the first national meta-analysis conducted to investigate the prevalence of injuries in recreational street runners. Although the prevalence of injuries was moderate, caution is required in terms of the weekly duration of running. Male runners are more susceptible, and muscle and knee injuries are the most common. Level of evidence II, Systematic reviewb of Level II Studies.

Falls determine huge epidemiological, clinical, and economic burden in the older population worldwide, presenting high odds of severe disability. The present study aimed to estimate the prevalence of falls and associated factors in older Brazilians using a systematic review with meta-analysis. Searches were performed in SciELO, PubMed, LILACS, Web of Science, Scopus and PsycINFO databases with no date or language restrictions. Studies on community-dwelling older persons aged ≥ 60 years from both sexes and with a sample size of ≥ 300 participants included. Exclusion criteria were studies conducted specifically for older adults diagnosed with chronic disabling diseases that predispose them to falls. Risk of bias of included studies was assessed using a critical appraisal tool focusing on prevalence designs. A random-effects meta-analysis was used to pool the prevalence of falls across studies. Exploratory analysis was conducted examining subgroup estimates, prevalence ratios and meta-regression. Thirty-seven studies involving 58,597 participants were included. Twelve-month prevalence of falls was 27% (95%CI: 24.3-30.0), with significantly higher estimates in female than male (PR = 1.57; 95%CI: 1.32-1.86), in age group ≥ 80 years than age group 60-69 years (PR = 1.46; 95%CI: 1.15-1.84), and in participants from the Central region than participants from the South region (PR = 1.36; 95%CI: 1.10-1.69) of Brazil. Risk of bias scores did not impact heterogeneity in the 12-month meta-analysis. These estimates strongly support evidence-based public interventions to prevent falls in older Brazilians, especially in women and the oldest-old population.

The load in resistance training is considered to be a critical variable for neuromuscular adaptations. Therefore, it is important to assess the effects of applying different loads on the development of maximal strength and muscular hypertrophy. The aim of this study was to systematically review the literature and compare the effects of resistance training that was performed with low loads versus moderate and high loads in untrained and trained healthy adult males on the development of maximal strength and muscle hypertrophy during randomized experimental designs. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (2021) were followed with the eligibility criteria defined according to participants, interventions, comparators, outcomes, and study design (PICOS): (P) healthy males between 18 and 40 years old, (I) interventions performed with low loads, (C) interventions performed with moderate or high loads, (O) development of maximal strength and muscle hypertrophy, and (S) randomized experimental studies with between- or within-subject parallel designs. The literature search strategy was performed in three electronic databases (Embase, PubMed, and Web of Science) on 22 August 2021. Results: Twenty-three studies with a total of 563 participants (80.6% untrained and 19.4% trained) were selected. The studies included both relative and absolute loads. All studies were classified as being moderate-to-high methodological quality, although only two studies had a score higher than six points. The main findings indicated that the load magnitude that was used during resistance training influenced the dynamic strength and isometric strength gains. In general, comparisons between the groups (i.e., low, moderate, and high loads) showed higher gains in 1RM and maximal voluntary isometric contraction when moderate and high loads were used. In contrast, regarding muscle hypertrophy, most studies showed that when resistance training was performed to muscle failure, the load used had less influence on muscle hypertrophy. The current literature shows that gains in maximal strength are more pronounced with high and moderate loads compared to low loads in healthy adult male populations. However, for muscle hypertrophy, studies indicate that a wide spectrum of loads (i.e., 30 to 90% 1RM) may be used for healthy adult male populations.

RESUMO No Brasil, a corrida de rua é o segundo esporte mais praticado; entretanto, pode ocasionar lesões musculoesqueléticas. Estudos sobre o tema são importantes para nortear estratégias de prevenção e intervenção. Assim, o objetivo foi investigar a prevalência de lesões e os fatores associados em corredores de rua da cidade de Juiz de Fora(MG). Trata-se de um estudo observacional do tipo transversal. A amostra foi selecionada por conveniência. Foram incluídos corredores amadores, entre 18 e 60 anos e que realizavam treinos em diferentes locais da cidade. Foram excluídos participantes com histórico de fratura e osteossíntese em membros inferiores ou que praticassem outro esporte que não fosse a musculação. Para analisar os dados, foram utilizados os testes t de Student, Mann-Whitney e X2 (α=0,05). Os participantes foram alocados em grupo lesão (GL, n=37) e grupo sem lesão (GSL, n=113). A prevalência de lesão foi de 24,7%. O GL praticava a corrida há mais tempo (76,2 ± 9,1 × 36,7 ± 39,0 meses; P<.01), teve menor aumento da frequência semanal do treinamento (49,5% × 54,2%; P=.04), realizou menos alongamento prévio (48,6% × 75,2%; P=.02), apresentou maior percentual de análise da marcha para escolha do calçado (62,1% × 43,3%; P=.04) e uso de palmilha (35,1% X 14,1%; P=<.01). A prevalência de lesões foi baixa. Os que correm há mais tempo têm maior risco de lesão mesmo sem incremento na frequência semanal. O alongamento foi protetor e a prescrição de calçado e palmilha indiscriminados não garantiram resultados satisfatórios.

Background Resistance training has a positive impact on functional capacity and muscle mass in the elderly. However, due to physical limitations or a simple aversion against regular exercise, a majority of the elderly do not reach the recommended exercise doses. This led us to evaluate the effect of whole-body electromyostimulation (WB-EMS), a novel, time-efficient, and smooth training technology on physical function, fat-free mass, strength, falls-efficacy, and social participation of the elderly. Methods The present study is a randomized, parallel group clinical trial approved by the Ethics Committee of our Institution. Sixty-six volunteers (age ≥ 60 years) will be recruited from the geriatric outpatient department in a tertiary hospital and primary care units and randomized into two groups: WB-EMS group or active control group (aCG). The WB-EMS or aCG protocol will consist of 16 sessions for 8 consecutive weeks, twice per week. The primary outcomes will be maximal isometric knee extension (IKE), functional lower extremity strength, fat-free mass, gait speed, and risk of falls measured before and after intervention. The secondary outcomes will be social participation and falls-efficacy assessed before and after the intervention and at three and six months of follow-up. Participant’s satisfaction with and awareness of electrical stimulation therapy will also be assessed immediately after the 8-week intervention. Discussion Patients receiving WB-EMS exercises are believed to have better outcomes than those receiving conventional, more time-consuming resistance exercises. Hence, innovative, time-efficient, joint-friendly, and highly individualized exercise technologies (such as WB-EMS) may be a good choice for the elderly with time constraints, physical limitations, or little enthusiasm, who are exercising less than the recommended amounts for impact on muscle mass, strength, and function.

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This study aimed to investigate the course of low back pain (LBP) intensity over a period of 12 months in older people with and without kinesiophobia.This was an international multicenter study. LBP intensity was examined by using the Numerical Pain Scale at baseline and over five follow-up periods. The Fear-Avoidance Beliefs Questionnaire was used to measure patients’ beliefs and fears. The study included 532 older adults (non kinesiophobic = 227; kinesiophobic = 305). The individuals had moderate pain at baseline, with a significant difference observed between the groups. Participants showed a rapid improvement in the first 6 weeks, followed by minor improvements in the succeeding months. However, a significant difference between groups remained during the follow-up period. Independently, kinesiophobia is a significant prognostic factor. These findings suggest the importance of screening for psychosocial factors in the management of older patients with LBP. Practice implications: patients need to be warned that pain can be perpetuated by inappropriate avoidance behaviors that may later lead to disability.