Submitted:
21 June 2025
Posted:
23 June 2025
Read the latest preprint version here
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
Understanding Load in Youth
- External load (e.g., distance run, repetitions, speed)
- Internal load (e.g., heart rate, rate of perceived exertion - RPE, hormonal response)
Periodization Principles
Load Monitoring Strategies
- 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]
Injury Risk and Recovery
3.4. Motor Skill Development and Psychological Considerations
Fundamental Motor Skills as a Foundation
Skill Progression Across Maturation
- Movement quality over intensity
- Simplified cues
- Coordination drills targeting balance, rhythm, and timing [28]
Long-Term Skill Adaptability
- Early stages: visual cues and external focus
- Later stages: self-assessment, video review, and scenario-based correction
Psychological Considerations in Youth Athlete Development
3.5. Early Specialization vs Multisport Participation
Early Specialization: Definition and Risks
Multilateral Development: Definition and Benefits
- 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]
Individual and Sport-Specific Considerations
Illustrative Case Studies
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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef]
- Malina, R.M.; Bouchard, C.; Bar-Or, O. Growth, Maturation, and Physical Activity, 2nd ed.; Human Kinetics: Champaign, IL, USA, 2004. [Google Scholar]
- Lloyd, R.S.; Oliver, J.L. The youth physical development model. Strength Cond. J. 2012, 34, 61–72. [Google Scholar] [CrossRef]
- 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. [Google Scholar] [CrossRef]
- 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. [Google Scholar]
- 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. [Google Scholar] [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. [Google Scholar] [CrossRef]
- Côté, J.; Vierimaa, M. The developmental model of sport participation: 15 years after its first conceptualization. Sci. Sports 2014, 29, S63–S69. [Google Scholar] [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. [Google Scholar] [CrossRef]
- Collins, D.; MacNamara, Á.; McCarthy, N. Putting the bumps in the rocky road: Optimizing the pathway to excellence. Front. Psychol. 2016, 7, 1482. [Google Scholar] [CrossRef] [PubMed]
- Rowland, T.W. Developmental Exercise Physiology, 2nd ed.; Human Kinetics: Champaign, IL, USA, 2005. [Google Scholar]
- Armstrong, N.; McManus, A.M. Physiology of elite young male athletes. Med. Sport Sci. 2011, 56, 1–22. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [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. [Google Scholar] [CrossRef]
- 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. [Google Scholar]
- 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. [Google Scholar] [CrossRef]
- 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. [Google Scholar] [CrossRef]
- Malina, R.M.; Beunen, G.P. Maturity-associated variation in adolescent physical performance. Sports Med. 1996, 22, 65–89. [Google Scholar] [CrossRef]
- 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. [Google Scholar] [CrossRef]
- Halson, S.L. Monitoring training load to understand fatigue in athletes. Sports Med. 2014, 44 (Suppl. 2), S139–S147. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [CrossRef] [PubMed]
- 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. [Google Scholar] [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. [Google Scholar] [CrossRef]
- Ranganathan, R.; Newell, K.M. Emergent flexibility in motor learning. Trends Cogn. Sci. 2013, 17, 583–590. [Google Scholar] [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. [Google Scholar] [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. [Google Scholar] [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 |
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