Submitted:
11 September 2025
Posted:
12 September 2025
You are already at the latest version
Abstract
Keywords:
1. Introduction
- Synthesize the current evidence on training and testing approaches in youth sports;
- Highlight the implications of growth, maturation, and specialization on athletic performance and injury risk;
- Provide practical, developmentally aligned recommendations to support safe and effective youth athlete development across various sport disciplines.
2. Methodology
2.1. Search Strategy
- “youth athletes” AND “training”,
- “exercise testing” AND “adolescents”,
- “growth and maturation”,
- “early specialization”,
- “long-term athlete development”,
- “load monitoring”,
- “injury risk” AND “developmental stage”.
2.2. Inclusion and Exclusion Criteria
- Focused on athletes aged 10 to 18 years;
- Reported exercise testing, training strategies, or maturation-specific adaptations;
- Were published in peer-reviewed journals in English.
- Studies focused solely on adult or elderly populations;
- Non-sport-specific medical reviews;
- Narrative articles without evidence-based focus.
2.3. Selection and Synthesis
- growth and maturation,
- exercise testing,
- training load and periodization,
- motor skill development, and
- early specialization.
3. Thematic Synthesis of Current Training and Testing Strategies
3.1. Growth, Maturation, and Biological Variability in Young Athletes
3.2. Exercise Testing in Youth Athletes
3.3. Training Load and Periodization for Young Athletes
- External load (e.g., distance run, repetitions, speed)
- Internal load (e.g., heart rate, rate of perceived exertion - RPE, hormonal response)
- Objective tools: heart rate monitors, GPS units, session duration, jump-based neuromuscular diagnostics
- Subjective tools: RPE scales (e.g., CR-10 or modified Borg), wellness questionnaires, fatigue and soreness check-ins [24]
3.4. Motor Skill Development and Psychological Considerations
- Movement quality over intensity
- Simplified cues
- Coordination drills targeting balance, rhythm, and timing [28]
- Early stages: visual cues and external focus
- Later stages: self-assessment, video review, and scenario-based correction
3.5. Early Specialization vs Multisport Participation
- Overuse injuries (e.g., Osgood-Schlatter, stress fractures)
- Psychological burnout and motivation loss
- Reduced overall motor skill versatility
- Enhances motor skill transfer across sports
- Reduces the risk of overuse injuries
- Improves long-term athlete retention and enjoyment
- Increases the likelihood of reaching elite levels in late-specialization sports (e.g., football, basketball, athletics) [11]
4. Discussion
5. Conclusions and Recommendations
Author Contributions
Funding
Conflicts of Interest
Data Availability Statement
References
- Brenner, J.S. Sports specialization and intensive training in young athletes. Pediatrics 2016, 138, e20162148. [CrossRef]
- Bergeron, M.F.; Mountjoy, M.; Armstrong, N.; et al. International Olympic Committee consensus statement on youth athletic development. Br. J. Sports Med. 2015, 49, 843–851. [CrossRef]
- Mănescu, D.C. Elements of the specific conditioning in football at university level. Marathon 2015, 7(1), 107-111.
- DiFiori, J.P.; Benjamin, H.J.; Brenner, J.S.; et al. Overuse injuries and burnout in youth sports. Clin. J. Sport Med. 2014, 24, 3–20. [CrossRef]
- Myer, G.D.; Jayanthi, N.; DiFiori, J.P.; et al. Sports specialization, part I: Does early sports specialization increase negative outcomes and reduce the opportunity for success in young athletes? Sports Health 2015, 7, 437–442. [CrossRef]
- Mănescu, D.C. Fundamente teoretice ale activității fizice. 2013, Editura ASE.
- Malina, R.M.; Bouchard, C.; Bar-Or, O. Growth, Maturation, and Physical Activity, 2nd ed.; Human Kinetics: Champaign, IL, USA, 2004.
- Lloyd, R.S.; Oliver, J.L. The youth physical development model. Strength Cond. J. 2012, 34, 61–72. [CrossRef]
- Manescu, D.C. Solutions to fight against overtraining in bodybuilding routine. Marathon 2013, 5(2), 182- 186.
- Mirwald, R.L.; Baxter-Jones, A.D.G.; Bailey, D.A.; Beunen, G.P. An assessment of maturity from anthropometric measurements. Med. Sci. Sports Exerc. 2002, 34, 689–694. [CrossRef]
- Manescu, D.C. Alimentaţia în fitness şi bodybuilding. 2010, Editura ASE.
- Beunen, G.; Malina, R.M. Growth and biologic maturation: Relevance to athletic performance. In The Young Athlete; Hebestreit, H., Bar-Or, O., Eds.; Blackwell Publishing: Oxford, UK, 2008; pp. 3–17.
- Lloyd, R.S.; Cronin, J.B.; Faigenbaum, A.D.; et al. National Strength and Conditioning Association position statement on long-term athletic development. J. Strength Cond. Res. 2016, 30, 1491–1509. [CrossRef]
- Mănescu, D.C.; Mănescu, A.M. Artificial Intelligence in the Selection of Top-Performing Athletes for Team Sports: A Proof-of-Concept Predictive Modeling Study. Appl. Sci. 2025, 15, 9918. [CrossRef]
- Ford, P.R.; De Ste Croix, M.; Lloyd, R.; et al. The long-term athlete development model: Physiological evidence and application. J. Sports Sci. 2011, 29, 389–402. [CrossRef]
- Côté, J.; Vierimaa, M. The developmental model of sport participation: 15 years after its first conceptualization. Sci. Sports 2014, 29, S63–S69. [CrossRef]
- Mănescu, D.C. Computational Analysis of Neuromuscular Adaptations to Strength and Plyometric Training: An Integrated Modeling Study. Sports 2025, 13, 298. [CrossRef]
- Malina, R.M.; Kozieł, S.M. Validation of maturity offset in a longitudinal sample of Polish boys. J. Sports Sci. 2014, 32, 424–437. [CrossRef]
- Collins, D.; MacNamara, Á.; McCarthy, N. Putting the bumps in the rocky road: Optimizing the pathway to excellence. Front. Psychol. 2016, 7, 1482. [CrossRef]
- Mănescu, A.M.; Grigoroiu, C.; Smîdu, N.; Dinciu, C.C.; Mărgărit, I.R.; Iacobini, A.; Mănescu, D.C. Biomechanical Effects of Lower Limb Asymmetry During Running: An OpenSim Computational Study. Symmetry 2025, 17, 1348. [CrossRef]
- Rowland, T.W. Developmental Exercise Physiology, 2nd ed.; Human Kinetics: Champaign, IL, USA, 2005.
- Armstrong, N.; McManus, A.M. Physiology of elite young male athletes. Med. Sport Sci. 2011, 56, 1–22. [CrossRef]
- Baquet, G.; Berthoin, S.; Dupont, G.; Blondel, N.; Fabre, C.; Van Praagh, E. Effects of high-intensity intermittent training on peak VO₂ in prepubertal children. Int. J. Sports Med. 2002, 23, 439–444. [CrossRef]
- Mănescu, D.C. Big Data Analytics Framework for Decision-Making in Sports Performance Optimization. Data 2025, 10, 116. [CrossRef]
- Philippaerts, R.M.; Vaeyens, R.; Janssens, M.; et al. The relationship between peak height velocity and physical performance in youth soccer players. J. Sports Sci. 2006, 24, 221–230. [CrossRef]
- Meylan, C.M.; Cronin, J.B.; Oliver, J.L.; Hughes, M.G. Talent identification in soccer: The role of maturity status on physical, physiological and technical characteristics. Int. J. Sports Sci. Coach. 2010, 5, 571–592. [CrossRef]
- Manescu, D.C. Noțiuni complementare ale antrenamentului sportiv. 2025, Editura Risoprint.
- Myer, G.D.; Ford, K.R.; Brent, J.L.; Hewett, T.E. Reliability and validity of a modified drop vertical jump assessment. J. Strength Cond. Res. 2011, 25, 1975–1983.
- Manescu, D.C. Bazele generale ale antrenamentului sportiv. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2515.
- Lloyd, R.S.; Faigenbaum, A.D.; Stone, M.H.; et al. Position statement on youth resistance training: The 2014 International Consensus. Br. J. Sports Med. 2014, 48, 498–505. [CrossRef]
- Manescu, D.C. Nutriție ergogenă, suplimentație și performanță. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2522.
- Lloyd, R.S.; Oliver, J.L.; Faigenbaum, A.D.; et al. Long-term athletic development, part 1: A pathway for all youth. J. Strength Cond. Res. 2015, 29, 1439–1450. [CrossRef]
- Malina, R.M.; Beunen, G.P. Maturity-associated variation in adolescent physical performance. Sports Med. 1996, 22, 65–89. [CrossRef]
- Manescu, D.C. Powerlifting. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2525.
- Oliver, J.L.; Lloyd, R.S.; Rumpf, M.C.; et al. Developing speed and agility in youth: The role of maturation and training. Strength Cond. J. 2013, 35, 42–48.
- Manescu, D.C. Fotbal – Știința performanței. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2524.
- Halson, S.L. Monitoring training load to understand fatigue in athletes. Sports Med. 2014, 44 (Suppl 2), S139–S147. [CrossRef]
- Manescu, D.C. Fitness. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2521.
- Jayanthi, N.A.; Pinkham, C.; Dugas, L.; Patrick, B.; LaBella, C. Sports specialization in young athletes: Evidence-based recommendations. Sports Health 2013, 5, 251–257. [CrossRef]
- Barnett, L.M.; Lai, S.K.; Veldman, S.L.; et al. Correlates of gross motor competence in children and adolescents. Sports Med. 2016, 46, 1663–1686. [CrossRef]
- Manescu, D.C. Bodybuilidng. 2025, Editura Risoprint. https://www.risoprint.ro/detaliicarte.php?id=2517.
- Robinson, L.E.; Stodden, D.F.; Barnett, L.M.; et al. Motor competence and its effect on positive developmental trajectories of health. Sports Med. 2015, 45, 1273–1284. [CrossRef]
- Vaeyens, R.; Lenoir, M.; Williams, A.M.; Philippaerts, R.M. Talent identification and development programmes in sport: Current models and future directions. Sports Med. 2008, 38, 703–714. [CrossRef]
- Ranganathan, R.; Newell, K.M. Emergent flexibility in motor learning. Trends Cogn. Sci. 2013, 17, 583–590. [CrossRef]
- Côté, J.; Lidor, R.; Hackfort, D. ISSP position stand: To sample or to specialize? Seven postulates about youth sport activities that lead to continued participation and elite performance. Int. J. Sport Exerc. Psychol. 2009, 7, 7–17. [CrossRef]
- Law, M.P.; Côté, J.; Ericsson, K.A. Characteristics of expert development in rhythmic gymnastics: A retrospective study. Int. J. Sport Exerc. Psychol. 2007, 5, 82–103. [CrossRef]








| Characteristic | Early Maturers | Late Maturers |
|---|---|---|
| Growth Spurt Timing | Before peers (~10–12 y/o) |
After peers (~12–14 y/o) |
| Muscle Mass Gain | Earlier and more pronounced |
Delayed but sustained |
| Strength & Power | Temporary advantage |
Temporary disadvantage |
| Injury Risk During PHV | Moderate–High | High during rapid growth phase |
| Talent Identification Bias | Often favored in youth selection |
Often overlooked |
| Psychosocial Maturity | Varies; may face high pressure early |
Resilient, motivated |
| Long-Term Performance Potential | Not always sustained | Often higher in adulthood |
| Sport | Recommended Tests (Pre-PHV) |
Recommended Tests (During/Post-PHV) |
|---|---|---|
| Football | Multi-Stage Fitness Test, T-test agility, Vertical Jump |
Yo-Yo IR1, Sprint Tests (10–30 m), FMS, CMJ |
| Basketball | Beep Test, 5-10-5 Shuttle, Standing Long Jump |
Sprint Agility Tests, Jump Tests (CMJ, SJ), LESS, FMS |
| Gymnastics | Flexibility assessment, Static Balance, Core Endurance |
Dynamic Strength (Plank Hold), Movement Screening, Landing Mechanics |
| Swimming | 25 m Swim Time Trials, Push-off Power, Kick Efficiency |
VO₂ Swim Test, Repeated Sprint Swim Test, Start Reaction Time |
| Tennis | Agility Ladder, Medicine Ball Throw, Hand-Eye Coordination |
Serve Velocity, Lateral Movement Test, Anaerobic Intervals |
| Sport & Typical PHV Age |
Common Injuries During PHV |
Contributing Factors | Recommended Tests (Pre-PHV) |
Recommended Tests (During/Post-PHV) |
|---|---|---|---|---|
| Football Boys: 12–14 Girls: 10–12 |
Osgood-Schlatter, Sever’s disease, hamstring strains, ankle sprains, growth plate injuries | Rapid growth, increased training load, neuromuscular imbalance |
Beep/Multi-Stage Fitness Test, T-test agility, Standing Long Jump |
Yo-Yo IR1, Sprint (10–30m), FMS, CMJ, LESS |
| Basketball Boys: 12–14 Girls: 10–12 |
Patellofemoral pain, ankle sprain, stress fractures, Osgood-Schlatter |
Jumping/landing frequency, coordination deficits, high growth velocity | Shuttle Run, Vertical Jump, Balance Testing |
Sprint Agility, Jump Tests (CMJ, SJ), LESS, FMS |
| Gymnastics Girls: 10–12 |
Wrist pain, stress fracture, ACL injury, spondylolysis |
Early specialization, repetitive loading, flexibility demands | Flexibility, Static Balance, Core Endurance |
Plank Hold, Movement Screening, Landing Mechanics |
| Swimming Boys: 12–14 Girls: 10–12 |
Shoulder impingement, lumbar pain, apophysitis | Repetitive overhead movement, poor technique, growth spurts |
25m Time Trials, Push-off Power, Kick Efficiency |
VO₂ Swim Test, Repeated Sprint, Start Reaction Time |
| Tennis Boys: 12–14 Girls: 10–12 |
Little League elbow, rotator cuff tendinopathy, back pain |
Repetitive strokes, single-sided loading, early specialization |
Agility Ladder, Medicine Ball Throw, Hand-Eye Coordination | Serve Velocity, Lateral Movement Test, Anaerobic Intervals |
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).