Developing Physically Active and Sporty Kids - Overuse Injuries and Burnout

Original Editor - Jess Bell based on the course by Tracy Prowse
Top Contributors - Jess Bell

Introduction[edit | edit source]

While physical activity is declining in young people generally,[1] a large number of children participate in organised sports every year. In the US alone, more than 46.5 million children play sports.[2] While the benefits of physical activity are clear,[3] involvement in formal sport can also lead to overtraining, overuse injuries and burnout. Each year, more than 10 percent of American children aged under 14 are treated for sports injuries. In 2015 to 2016, 1.2 million injuries were recorded for high school athletes in the US.[4] Moreover, half of all sports injuries in children aged over 10 years are overuse injuries.[5][6] The overtraining associated with overuse injuries can also lead to burnout in young athletes, which can affect a child's long-term participation in sports.[7]

[8]

Defining Overuse Injuries and Burnout[edit | edit source]

Overuse[edit | edit source]

"Overuse injuries occur due to repetitive submaximal loading of the musculoskeletal system when rest is not adequate to allow for structural adaptation to take place. Injury can involve the muscle-tendon unit, bone, bursa, neurovascular structures and the physis. Overuse injuries unique to young athletes include apophyseal injuries and physeal stress injuries."[9]

DiFiori and colleagues[9] note that there are specific ‘high-risk’ overuse injuries that can cause a child to have prolonged periods off sport. These injuries may also affect a child's future participation in sport. Common injuries in children are discussed here, but examples of high-risk overuse injures include:

  • Specific stress fractures
  • Physeal stress injuries
  • Osteochondritis dissecans
  • Certain apophyseal injuries

Burnout[edit | edit source]

Burnout is considered as part of a spectrum of conditions which includes over-reaching and overtraining.[9] DiFiori and colleagues state that it occurs:

"as a result of chronic stress that causes a young athlete to cease participation in a previously enjoyable activity."[9]

Growing Need For Intervention[edit | edit source]

There are a number of factors which increase a child's risk of injury. Specific anatomical features are discussed in more detail here, but the following factors should be considered:[6]

  • Immature bones[10][11]
  • Insufficient rest after an injury
  • Poor training or conditioning / muscle strength[11]
  • Specialisation in just one sport
    • Young athletes are specialising in sports (and positions) at earlier ages, which is known to increase injury risk [9][10][12]
    • Specialisation may also be associated with burnout, but as DiFiori and colleagues[9] note, not all children who drop out of sports are burnt out
    • It has been found that diversified sports training during early and middle adolescence may help athletes develop elite-level skills,[9] so specialisation can be delayed until late adolescence[6] (the video below discusses early versus delayed specialisation in many areas, including sports)
  • Year-round participation[13]
    • Training schedules are often regimented and repetitive, which has increased the number of overuse injuries in children[13]
  • Changes in society[6]

[14]

Overuse Injury and Burnout Prevention[edit | edit source]

A child’s history of injury is:[6]

  • A risk factor for future injury (during both adolescence and adulthood)
  • A contributor to long-term degenerative diseases, such as osteoarthritis

As is shown in Table 1, which is based on the work of DiFiori and colleagues,[9] risk factors can be divided into intrinsic and extrinsic risk factors.

Table 1. Intrinsic and extrinsic risk factors.[9] Key: +++ = strong predictor of future injury / burnout; ++ = moderate predictor; + = mild predictor; 0 = poor evidence, not considered a predictor of injury
Intrinsic Risk Factors Extrinsic Risk Factors
Prior injury +++ Higher training volumes ++
Growth spurt +++ Overscheduling+ (recovery time ++)
History of amenorrhea +++ Poor-fitting equipment +
Joint hypermobility + (especially during adolescence) Sport specialisation +
Readiness + (physical and psychosocial, not age)
Anatomic malalignment, flexibility, functional control of movement 0
Sufficient strength to withstand forces and range of motion +

Jayanthi and colleagues[15] found that the following factors had an increased odds of serious overuse injury:

  • Young athletes participating in more hours of sports per week than their age in years (i.e. > 9 hours for 9 years)
  • Young athletes whose ratio of organised sport to free play was >2:1 hours per week

[16]

Recommendations for Interventions[edit | edit source]

Overuse Injuries[edit | edit source]

An intervention programme for overuse injuries should:[6][9]

  • Focus on preventable risk factors first (education and communication)
  • Aim for proper technique / basic skills
  • Strength and ability training should be part of the child’s routine
  • 10 percent rule:
    • Children should not increase their training volume by more than 10 percent a week[5]
  • Training workload and growth rates during growth spurts should be monitored, especially during early adolescence

Acute Injuries[edit | edit source]

For acute injuries, intervention programmes should include:[6]

  • One or two strength-training sessions a week, perhaps at the end of practice sessions
    • Children should exercise their whole body, including core work and specific muscles[6][17]
  • Agility and proprioception exercises twice a week
  • An adequate warm-up:
    • Prepare the neuromuscular system[18] for competition
  • Specific joint and muscle strengthening (particularly for hypermobility / low connective tissue tone)

The rest of this page focuses on specific components of a warm-up, conditioning and strengthening programmes.

Warm-Up[edit | edit source]

Warm-up sessions should include:[6]

  • Half to three-quarter speed jogging and backwards jogging
  • Mild jog with high knees, skipping, butt kicks and toe reaching
  • Crawling calf stretch
  • Lunges with twist and walking quadriceps stretch
  • Warm-up with active, dynamic mobility exercises[19]
    • Move through the range of motion necessary for a specific sport
    • If the athlete’s sport requires a range that they are yet to achieve, it is important to stretch during the cool-down or at home
  • Three-quarter speed sport-specific coordination training
    • This includes any activity that challenges balance, stability and agility, such as:
      • Bounding
      • Hopping
      • Diagonal cutting
  • Include a few strengthening exercises for muscles that tend to become strained in the relevant sport (often the hamstrings and groin muscles)

NB: The cool-down should include static stretches, and time should be given to drink fluid.[6]

There are a range of ideas for warm-ups available at Small Blacks and FIFA. See the videos below for a few ideas of drills and games that can be used during a warm-up.

Conditioning[edit | edit source]

Physical conditioning usually has multiple components including:[24]

  • Power
  • Strength
  • Speed
  • Balance
  • Agility
  • Coordination
  • Endurance

To improve fitness and sports performance, physical conditioning is often included in sports and exercise training. Conditioning programmes might also include cross-training - i.e. using different sports / exercises to enhance performance. Cross-training introduces different physical stresses rather than those routinely applied during sports / daily activities. This variety helps to improve the child’s performance generally, but also reduces their risk of experiencing an overuse injury.[24]

However, acute and overuse injuries can be associated with conditioning programmes.[25] Acute musculoskeletal injuries (i.e. muscle strains, fractures, and dislocations) usually occur during a traumatic event. Overuse injuries (e.g. stress fracture / shin splints) tend to occur when an athlete increases the frequency, duration, intensity and resistance too quickly, which places too much stress on the body.[25]

Training programmes must, therefore, be designed with a specific end goal.[26] Attempting to achieve a goal too quickly can increase the risk of an overuse injury.[6]

The following factors should be considered by parents and coaches before a child starts a conditioning programme:[25]

  • Trainers should first consult with the child’s doctor, sports medicine physician or physiotherapist
    • Some teams may have pre-participation physicals / screening to identify any issues
    • If a child has experienced an injury or had surgery, their doctor / physiotherapist should be consulted to ensure they are able to return to sports safely
    • Children should be encouraged to see a medical professional if they have aches and pain - untreated injuries may get worse or cause further complications
  • It can be beneficial for coaches to include a variety of exercises that are different to the team's usual training

Strength Training in Children[edit | edit source]

Strength and agility training should be promoted in school sports.[6] Strength training is a specialised approach to conditioning. It includes a range of activities / exercises that usually require specific pieces of equipment, including:[6][17][27]

  • Dumbbells
  • Elastic bands
  • Strap-on weights
  • Weight machines
  • Medicine balls

It also includes body-weight exercises that are specifically designed to enhance or maintain muscular fitness and core exercises.[27] Any agility and proprioception exercises that are included in a strengthening programme should be sport-specific.

There is no minimum age to start a strengthening programme,[27] but it is important to remember that children and adolescents are not mini-adults.[6] The following points should be considered before starting any programme:[27]

  • The child must have the emotional maturity to follow instructions
    • As a general rule, children who are ready to participate in a sports activity (usually around the age of 7 or 8) may be ready to begin strength training
  • Children must be fit enough to successfully participate in a programme and should not have any pre-existing conditions which could increase their risk of injury
  • Children / adolescents should not attempt a strength training programme on their own
    • Qualified professionals should provide guidance in order to create a programme that is suitable for the child - i.e. one that considers the child’s needs, interests and ability
    • Close supervision, age-appropriate instruction, suitable equipment and a safe environment are all essential
  • Children should initially try an exercise with no load - as their skill increases, load can gradually be increased

[28]

Components of a Strengthening Programme[edit | edit source]

Key components of a strengthening programme:[6][17][27]

  • Adequate warm-up (5 to 10 minutes)
  • Aim for 60% of 1 RPM for the average child for the average sport
  • Initially no load
  • Aim for 3 sets of +/- 15 repetitions (no cheating)
  • Strength train 2 to 3 times per week on non-consecutive days
  • When progressing, remember the 10 percent rule
  • The child should aim for three sets at 7/10 fatigue
    • Strengthen to fatigue, rest and repeat
  • Use a variety of strengthening techniques
  • Close supervision, individual effort and levels

To achieve pure strength, work at 75-90% 1 RM (repetition maximum) for 5 to 10 repetitions (aim for 10). To achieve muscular endurance, work at <60% 1RM  15 to 20 repetitions.[6]

A strengthening programme should be general - i.e. the aim is for “comprehensive capacity”. Sports-specific skills can be added in later if required. Balance, coordination and plyometric exercises should also be included.[6] It is important that the programme is challenging and does not get boring for the child. This can be achieved by systematically reviewing / varying the training programme.[6]

Children and adolescents should not participate in powerlifting, bodybuilding or maximal lifts (due to physical and skeletal immaturity) - i.e. they should avoid explosive, rapid weight lifting.[17]

Another important consideration is the structure of the strengthening class. Children should have access to fluids and proper nutrition. Moreover, illness or injury must be considered:[6]

  • Aim for a 10 to 15 minute dynamic warm-up (see above)
  • Focus on proper exercise technique and learning fundamental training principles
  • The cool-down should include less intense activities and stretching, mobility or yoga

NB: The American Academy of Pediatrics[17] advises that instructors or teachers be certified to provide specific paediatric strength training. It is also essential to obtain medical and parental consent before commencing any programme.

Core Training in Children[edit | edit source]

How important is core training for children? Core muscles are pre-anticipatory, which means they activate prior to an activity.[6] Thus, children will naturally engage their core when they play (e.g. playing tag, climbing a tree etc):[6]

  • More emphasis should, therefore, be placed on general strength training than just core strengthening
  • Many basic strength training exercises will also train the core
  • Basic sport / exercise provides the stimulus for endurance adaptations in the core, just like in other systems
  • To train at true comprehensive capacity and be well-rounded, a core workout should also address strength and power, not just endurance and speed-endurance

Benefits of Strength Training in Children[edit | edit source]

The potential benefits of paediatric resistance training include:[29]

  • Greater muscle strength, power and endurance
  • Improved motor skill performance
  • Increased bone mineral density
  • Enhanced body composition
  • Improved insulin sensitivity and blood lipid profile
  • Decreased risk of sports injuries
  • Improved sports performance

It also helps to create a more positive attitude to physical activity throughout the lifespan.[29]

[30]

Monitoring Effectiveness[edit | edit source]

It is beneficial to consider the child's aims when monitoring the effectiveness of an intervention.[6]

There are also a number of quick specific tests that can be used to measure balance, strength and activity.

  • Standing on one leg (in seconds)
  • Walking heel-to-toe on a line (max of 6 steps)
  • Plank assessment of torso strength (for 8 to 12 year olds)
  • Kneeling press up (BOT2 for 4 to 7 year olds)
  • Daily step count using a pedometer

The normal ranges for these tests are provided here.

Motivating Children[edit | edit source]

A child needs a sense of self-efficacy to engage in challenging tasks.[6] Intrinsic motivation is an essential component of strength training. It can be enhanced by:[6]

  • Setting a SMART goal for the child
  • Choosing praise carefully, rewarding effort and being specific with praise
  • Trying to find other “similar” children who can lead the way
  • Acknowledging and explaining discomfort

References[edit | edit source]

  1. Frömel K, Groffik D, Mitáš J, Madarasová Gecková A, Csányi T. Physical activity recommendations for segments of school days in adolescents: support for health behavior in secondary schools. Front Public Health. 2020;8:527442.
  2. Safe Kids Worldwide. Preventing sports-related injuries. Available from: https://www.safekids.org/preventing-sports-related-injuries (accessed 7 November 2021).
  3. Janssen I, LeBlanc AG. Systematic review of the health benefits of physical activity and fitness in school-aged children and youth. Int J Behav Nutr Phys Act. 2010;7(40).
  4. Welton KL, Kraeutler MJ, Pierpoint LA, Bartley JH, McCarty EC, Comstock RD. Injury recurrence among high school athletes in the United States: a decade of patterns and trends, 2005-2006 through 2015-2016. Orthop J Sports Med. 2018;6(1):2325967117745788.
  5. 5.0 5.1 American Academy of Pediatrics. Preventing overuse injuries in young athletes. Available from: https://www.healthychildren.org/English/health-issues/injuries-emergencies/sports-injuries/Pages/Preventing-Overuse-Injuries.aspx (accessed 7 November 2021).
  6. 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 Prowse T. Developing Physically Active and Sporty Kids - Overuse Injuries and Burnout Course. Physioplus, 2021.
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