1. Applying principal component analysis to identify underlying factors of key performance indicators from microsensor data in basketball gamesFilip Ujaković, Žiga Kozinc, Jernej Pleša, Nejc Šarabon, 2026, izvirni znanstveni članek Opis: The present study applied Principal Component Analysis (PCA) to complex microsensor data from 28 elite professional male basketball players across 122 games (1205 player/game samples) during two basketball seasons to reduce data dimensionality and identify underlying factors related to player load and movement intensity. External load was quantified using T7 Catapult monitoring devices, capturing 18 inertial measurement unit (IMU)-derived variables. PCA with varimax orthogonal rotation successfully extracted four distinct principal components (PC) with eigenvalues >1, collectively explaining 77.95% of the total variance. These components were interpreted as: PC 1 (33.43% variance), dominated by high-intensity acceleration and change of direction and representing high-intensity linear and multi-directional movements; PC 2 (19.27% variance), defined by deceleration measures, reflecting eccentric braking performance; PC 3 (15.49% variance) capturing overall accumulated mechanical workload; and PC 4 (9.76% variance) representing jumping frequency. In conclusion, PCA effectively reduced 18 highly correlated microsensor variables into four distinct, uncorrelated factors that encapsulate the main physical demands of elite basketball game-play, providing a more pragmatic and holistic framework for performance interpretation and subsequent tailoring of training prescription and monitoring over time. The extraction of these four factors provides a diagnostic framework for load profiling in elite basketball; however, as these results originate from a single-team observational design, future research is required to confirm the cross-contextual stability of this mechanical structure.
Ključne besede: basketball, measurement, loading
Objavljeno v RUP: 20.09.2026; Ogledov: 256; Prenosov: 10
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2. Experiences and perceptions of patients participating in prehabilitation and early rehabilitation for hip and knee arthroplasty : a systematic review and narrative synthesis of qualitative evidenceManca Zupančič Opara, Žiga Kozinc, Stefan Loefler, Karl Miedler, Nejc Šarabon, 2026, pregledni znanstveni članek Opis: Objective: To synthesize qualitative evidence on patients’ experiences and perceptions of prehabilitation and early rehabilitation in the context of hip and knee arthroplasty. Methods: A systematic review was conducted across PubMed, Scopus, and Web of Science, with the databases searched from inception to March 2026. Eligible studies included individuals referred for or undergoing total hip or knee arthroplasty and reporting qualitative data on experiences with prehabilitation or early rehabilitation. Titles, abstracts, and full texts were screened by one reviewer and independently checked by a second reviewer, while data extraction was performed independently by two reviewers. Methodological quality was assessed using the Critical Appraisal Skills Programme qualitative checklist. Findings were synthesized using a primarily descriptive narrative approach with thematic organization into facilitators and barriers; a formal qualitative meta-synthesis was not conducted. The review protocol was not registered. Results: Twelve studies were included: 11 focused on prehabilitation and two on early postoperative rehabilitation. The included studies involved patients undergoing total hip arthroplasty, total knee arthroplasty, or both procedures. Patient experiences were grouped into five thematic domains: symptoms and physical condition, understanding and information, behavior, psychological well-being, and intervention delivery. Reported facilitators included improved symptoms and physical function, greater understanding and preparedness for surgery, better pain coping, improved psychological well-being, and positive experiences with different delivery formats. Reported barriers included increased pain, information overload, language barriers, limited individualization, restricted interaction, and varying delivery preferences. The evidence base was heterogeneous in terms of intervention content, delivery mode, patient populations, and depth of qualitative reporting. Conclusion: Prehabilitation and early rehabilitation were generally perceived positively, but several barriers were identified. The findings highlight the importance of symptom monitoring, individualized exercise prescription, clear tailored education, and flexible delivery formats. However, the findings should be interpreted cautiously because the synthesis was primarily descriptive, the included studies were heterogeneous, and the evidence was substantially stronger for prehabilitation than for early rehabilitation.
Ključne besede: prehabilitation, early rehabilitation, hip arthroplasty, knee arthroplasty, patient experience, qualitative research
Objavljeno v RUP: 30.08.2026; Ogledov: 425; Prenosov: 5
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3. The effects of resistance exercise with blood flow restriction on muscle performance, muscle mass, and function in older adults : a systematic reviewMatic Jelen, Manca Zupančič Opara, Nejc Šarabon, 2026, pregledni znanstveni članek Ključne besede: aging, strength, power, endurance, frailty, hypertrophy, BFR, ischemia
Objavljeno v RUP: 24.07.2026; Ogledov: 537; Prenosov: 14
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6. Early rehabilitation after total hip or knee joint replacement : a narrative reviewManca Zupančič Opara, Žiga Kozinc, Helmut Kern, Klaus Müller-Hohenstein, Stefan Loefler, Nejc Šarabon, 2026, izvirni znanstveni članek Opis: When conservative treatment of osteoarthritis is not effective, patients may undergo total joint replacement. Postoperative rehabilitation is a crucial component of recovery, and early rehabilitation plays a particularly important role in optimizing outcomes, with the aim of enabling patients to return to independence and work as soon as possible. The aim of this paper is to summarize the role of early rehabilitation after total knee and hip joint replacement, including its main goals, key components, optimal timing, potential risks, and the evidence comparing early with delayed rehabilitation. Current evidence indicates that early inpatient rehabilitation contributes to faster recovery of mobility, improved joint range of motion and muscle strength, fewer postoperative complications, and shorter hospital stays. Early outpatient rehabilitation initiated soon after discharge may further support recovery by increasing daily physical activity, improving joint mobility, and reducing rehabilitation costs. Although some studies report similar clinical outcomes between early and delayed physiotherapy, earlier initiation may allow patients to achieve comparable functional recovery sooner. Overall, early rehabilitation represents a safe and effective approach that should be integrated into standard postoperative care pathways
Ključne besede: knee, hip, rehabilitation
Objavljeno v RUP: 07.06.2026; Ogledov: 626; Prenosov: 22
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7. The relationship between braking rate of force development, braking force impulse, push-off force distribution and jump performance : an exploratory studyŽiga Kozinc, Darjan Smajla, Daichi Nishiumi, Norikazu Hirose, Nejc Šarabon, 2026, izvirni znanstveni članek Ključne besede: jump, force, power
Objavljeno v RUP: 14.05.2026; Ogledov: 624; Prenosov: 16
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8. Body ownership illusions in immersive virtual reality : a implications for musculoskeletal rehabilitationManca Zupančič Opara, Nejc Šarabon, 2026, pregledni znanstveni članek Ključne besede: avatar, embodiment, musculoskeletal pain, predictive coding, Proteus effect, psychosocial barriers, VR
Objavljeno v RUP: 26.04.2026; Ogledov: 827; Prenosov: 22
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9. Lower-limb damping characteristics during various repetitive jumping forms : reliability and sensitivity analysisMarko Kapeleti, Marc Elmeua González, Igor Zlatović, David Nikolić, Oskar Cvjetičanin, Nejc Šarabon, 2026, izvirni znanstveni članek Opis: An essential aspect of jumping performance is the ability to control impact forces. One of the key measures of this ability is the damping ratio, a dimensionless parameter that quantifies the rate at which oscillations decay following a disturbance. This study aims to assess the intra-session and inter-session reliability of damping ratios at different lower-limb anatomical landmarks and evaluate their sensitivity in detecting differences between various repetitive jumping forms, with an emphasis on establishing a specific methodological approach. Twenty-three physically active male and female students performed maximal countermovement jumps (CMJs) and bilateral (BL) and unilateral (UL) hopping (HOP). Ten wireless inertial measurement units recorded inertial data of five bilateral lower-limb anatomical landmarks. Results showed that the damping ratios during CMJ and HOPUL demonstrated good reliability, whereas in HOPBL were moderately reliable. The damping ratios of nearly all the anatomical landmarks differed between the jumping forms. CMJ had the highest values, HOPBL the lowest, and HOPUL values in between, likely due to variations in joint stiffness and amplitude displacement, as well as stretch‒shortening cycle reliance. Methodologically, using 20 repetitions in an intra-session trial and averaging left and right sides for inter-session reliability and inter-jump sensitivity, damping ratios are acceptably reliable and sufficiently sensitive for biomechanical analysis of different repetitive jumping forms. This metric could potentially be a valuable tool in developing theoretical nonlinear multibody mass‒spring‒damper models and could enhance biomechanical analysis with practical applications in sports training and rehabilitation.
Ključne besede: stretch–shortening cycle, stiffness, impact absorption, oscillation, intraclass, correlation coefficient
Objavljeno v RUP: 13.04.2026; Ogledov: 698; Prenosov: 15
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10. Occupational and non-occupational device-measured movement behaviours and low back pain : a compositional isotemporal substitution analysisKaja Kastelic, Nejc Šarabon, Michael David Burnard, Željko Pedišić, 2026, izvirni znanstveni članek Opis: Background: Physical activity, sedentary behaviour, and sleep were shown to be independently associated with low back pain (LBP). The aim of this cross-sectional study was to explore the associations between 24-hour movement behaviour compositions and the occurrence, severity, and estimated level of LBP impact on an individual’s life. Methods: A convenience sample of 197 adults (40% females, 37 ± 11 years of age) were asked to wear an activPAL accelerometer for at least 7 consecutive days to assess their time-use composition consisting of moderate- to vigorous-intensity physical activity (MVPA), light- intensity physical activity (LPA), sedentary behaviour (SB), and sleep and to complete a questionnaire on LBP and sociodemographic characteristics. Compositional isotemporal substitution analyses were conducted separately for the non-domain-specific and domain- specific (including occupational and non-occupational domains) movement behaviour compositions. Results: Reallocating time from MVPA to any other movement behaviour or from sleep to LPA was associated with a higher LBP impact score. For example, reallocating 60 min/day from MVPA to LPA was associated with on average 17 points (95% CI: 6 to 28) higher LBP impact score (on a 0-70 scale). We did not find significant associations between the domain- specific time-use composition and LBP impact score (p = 0.060). We also did not find significant associations of the time-use compositions with occurrence and severity of LBP (p- value range: 0.067 to 0.649). Conclusion: Our study suggests that LBP sufferers with higher MVPA and sleep better cope with LBP. The differences in the LBP impact scores associated with theoretical reallocations between movement behaviours may be deemed clinically important. Future longitudinal and experimental studies in population-representative samples are needed to confirm our findings.
Ključne besede: musculoskeletal health, physical behaviours, time-use epidemiology
Objavljeno v RUP: 30.03.2026; Ogledov: 771; Prenosov: 24
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