Background and Objectives: Knee arthroplasty often leads to marked postoperative muscle weakness, with strength losses of up to 62% in the first month, contributing to functional impairment and patient dissatisfaction. Blood flow restriction (BFR) training, which combines low-load exercise with partial vascular occlusion, has shown promise in enhancing muscle strength across musculoskeletal conditions and may represent a valuable rehabilitation strategy for this vulnerable population. This review aimed to systematically evaluate the effectiveness and safety of BFR training in improving muscle strength and functional outcomes following knee arthroplasty. Materials and Methods: This systematic review was prospectively registered within PROSPERO (CRD420250652404) and conducted according to PRISMA guidelines. PubMed, Embase, and Cochrane Library were searched through February 2025 for randomized controlled trials (RCTs) investigating BFR training in knee arthroplasty patients. Study selection, data extraction, and risk of bias assessment (RoB 2 tool) were performed independently by two reviewers. Eligible trials reported muscle strength and/or functional outcomes as primary or secondary endpoints. Results: Four RCTs, including 148 patients undergoing total knee arthroplasty (mean age: 67 ± 6.5 years), met the inclusion criteria. All applied preoperative BFR training for 4–8 weeks with heterogeneous protocols. Two trials demonstrated significant improvements in muscle strength (1 RM leg press, 1 RM knee extension; large effect sizes) and functional outcomes (6 min walk test, 30 s sit-to-stand; earlier recovery), favoring BFR. The remaining studies showed no significant between-group differences, though moderate-to-large effect sizes generally favored BFR training. No adverse events were reported. Conclusions: Prehabilitation with BFR training shows considerable potential to enhance early postoperative muscle strength and functional recovery in patients undergoing knee arthroplasty, particularly when compared with usual care lacking structured preoperative intervention. The evidence to date suggests that BFR is a safe and well-tolerated strategy, offering an alternative for patients who cannot perform high-load resistance training. Its favorable safety profile, combined with the potential to accelerate functional recovery, highlights the promise of BFR for reducing rehabilitation costs and healthcare utilization. Nonetheless, larger, high-quality RCTs with standardized protocols and extended follow-up are required to confirm these preliminary findings and establish clear clinical guidelines for their implementation.

Background: Adolescence represents a critical period for growth and athletic development, yet young athletes frequently demonstrate significant gaps in nutritional knowledge that can impair performance and long-term health outcomes. Limited research exists on comprehensive nutrition education interventions for adolescent soccer players in North African populations. Objective: To evaluate both general and sports-specific nutritional knowledge among adolescent soccer players from an elite Tunisian club and assess the feasibility of a digital nutrition intervention using mobile application technology. Methods: A cross-sectional survey was conducted between June and August 2024 among 50 male soccer players aged 11–18 years from Étoile du Sahel club in Sousse, Tunisia. Data were collected via a structured questionnaire comprising sections on basic nutrition knowledge, influences on food choices, sports nutrition knowledge and practices, and demographic information. A pilot digital intervention using the FatSecret app was implemented with 8 participants over 4 weeks, involving meal photo uploads and nutritionist feedback. Results: Participants had a mean age of 15.16 ± 1.55 years, with 92% reporting no formal nutrition education. While 90% correctly identified carbohydrates as the primary energy source, only 2% recognized that fat provides the highest energy density. Significant misconceptions existed regarding sports nutrition: 74% incorrectly believed that consuming protein 2–4 h before an event enhances performance, and only 17% knew the recommended pre-event carbohydrate intake. Food choices were primarily influenced by cravings (80%) and sensory appeal rather than health considerations (20%). The digital intervention demonstrated extremely low engagement, with minimal participation in meal photo uploads. Conclusions: This study reveals critical gaps in both general and sports-specific nutritional knowledge among adolescent soccer players in Tunisia, providing important descriptive information about knowledge distribution in this population. While knowledge deficits are substantial, it is important to acknowledge that this cross-sectional assessment documents only knowledge patterns, without measures of actual dietary intake or athletic performance. The persistent misconceptions and the low feasibility of the digital intervention provide important lessons regarding technology-based approaches to nutrition education in this age group, highlighting challenges in sustained engagement that must be addressed in future intervention design.