BRINGING SCIENCE TO TREATMENT

Swimmer’s shoulder: the fast lane to recovery

Up to 90% of swimmers will experience shoulder pain at some point in their swimming careers. Andrew Hamilton looks at injury rehab recommendations and, in particular, the need for an appropriate return to a swimming programme in the pool.

Syrian refugee and Olympic swimmer Yusra Mardini is pictured during a training session, 2018

Although swimming is a relatively low-risk sport for injury, shoulder pain is surprisingly common in swimmers. Various studies show that over a career lifetime, between 40% and 91% of swimmers will suffer a swimming-related shoulder injury1 2 3 4. However, when you consider that elite swimmers may be racking up over 10km in the pool each day, and that the arms are the prime generators of forward thrust, we should perhaps not be surprised. High volume training can lead to muscle fatigue of the rotator cuff, upper back, and pectoral muscles, which in turn may result in microtrauma due to the decrease of dynamic stabilisation of the humeral head5 6.

Aetiology of shoulder injury in swimmers

To appreciate the vulnerability of a swimmer’s shoulder to injury, it helps to understand the biomechanics of the stroke cycle. Since freestyle is the most commonly used stroke (for example, the stroke of choice in related sports such as triathlon) we will focus on this style. The freestyle stroke consists of four distinct phases, which are shown in figures 1-4.

In freestyle swimming, each of these phases has the potential to increase the risk of shoulder injury when executed incorrectly. Some of the common errors are as follows:

  • Hand entry – the swimmer’s hand enters the water either medial or lateral to the ideal line (with the swimmer’s head representing 12 o’clock, a right hand should enter the water at approximately one o’clock and a left hand at 11 o’clock). A deviation either way increases stress on the rotator cuff.
  • Early pull through – a ‘dropped elbow’ (where the elbow is lower than the hand while the arm pulls under the body) will fail to fully engage the latissimus dorsi muscles, which can increase the risk of impingement. It also inhibits a smooth, symmetrical body roll, which is needed to decrease stress on the rotator cuff muscles and to keep the scapula appropriately anchored on the thorax.
  • Straight arm recovery – a fully extended elbow while the arm is out of the water in the recovery phase is another common error. During this phase, a bent elbow is much preferred because it reduces the amount of stress on the rotator cuff.

Figure 1: Hand entry

Figure 2: Early pull through

Figure 3: Late pull through

Figure 4: Recovery

In more general terms, it’s important to appreciate that the shoulder is an inherently unstable joint and that a correct balance of muscle forces are critical for maintaining stability, proper motion, and painless function. Since the bulk of the propulsive force in swimming is generated by adduction and internal rotation of the upper arm involving contraction of pectoralis major and the latissimus dorsi, high training volumes tend to favour increased adduction and internal rotation strength, which can lead to imbalance and reduced glenohumeral stability7 8. It’s also worth noting that female swimmers, on average, have shorter arm strokes than those of their male colleagues and are, from a biomechanical perspective, at a greater risk of suffering an overuse injury, due to the requirement for more arm revolutions per lap9.

Land-based prevention and rehab training

Studies suggest that an endurance training and strengthening program for the shoulder and periscapular muscles, with emphasis placed on the serratus anterior, rhomboids, lower trapezius, and subscapularis, may help prevent injuries and speed recovery when injury does occur10 11. There’s also evidence that abdominal and scapular muscle strengthening performed in dry-land training can yield benefits; in particular, the goal of core and abdominal strengthening is to develop increased control of the pelvis by avoiding excessive anterior pelvic tilt and lumbar lordosis12 13. Table 1 shows some example of some commonly-used dry-land training exercises that meet these criteria.

When shoulder injury does occur, clinical evaluation and diagnosis is recommended (see SIB issues 128 and 136 for a fuller discussion), along with complete or relative rest and the judicious use of dry-land rehab exercises. During periods of relative rest, ice may be used and short courses (up to 1 week) of non-steroidal anti-inflammatory medication may be beneficial. Injection of corticosteroid into the subacromial bursa however is a more controversial option and should be limited to swimmers with constant pain. It’s difficult to determine the optimum duration of relative rest but in all cases, the resumption of training should be gradual and closely monitored. If the pain persists, a three-day period of absolute rest is recommended, and the swimmer should then be reassessed before resuming training in the water. If pain persists upon the resumption of training, an evaluation by a physician is indicated14.

Table 1: Dry-land strength training

Muscle groupExamples of training exercise(s)
Primary rotator cuff muscles (performed in standing position, scapulae maintained in retraction)External rotation using Thera-Band — facilitates bilateral strengthening. Strengthens: Teres minor.

Straight arm lifts. Strengthens: Supraspinatus

Ball on the wall — one arm extended, rolling a ball in circles. Strengthens: Stabilizers of the rotator cuff and scapulae
Scapular musclesSeated row using Thera-Band® — scapulae maintained in retraction using looped Thera-Band. Strengthens: Rhomboids

Straight arm reverse arm lifts — performed lying on the stomach, arms fully extended at shoulder height, palms down, and lifting arm away from the floor; initially, only the weight of the arm is used, but as strength develops, 0.5 or 1.0kg weights may be used. Strengthens: Teres minor, rhomboids

Variable position push-ups — initially performed against a wall while standing, then on the knees, finally in a traditional push-up position. Strengthens: Serratus anterior
Abdominal and lower back musclesSupine flutter kicking — performed lying flat on the back with hands under the pelvis back lightly “flutter kicking” the legs before progressing to a similar motion with the arms. Strengthens: Abdominal muscles

Kneeling diagonals — performed in a kneeling position with upper body level to the floor and hands touching the floor with the back kept flat; the right arm and the left leg are lifted and held for 1 second, then the contra-lateral sides performed in an alternating pattern; exercise can be performed with eyes closed, which emphasizes the use of the postural muscles to a greater degree to develop balance and stability. Strengthens: Lower back

Box 1: The use of equipment

The use of swimming aids to develop strength and power is commonplace in the competitive environment. However, when returning to the pool after a shoulder injury, some aids are contraindicated:

  • Kickboards — used to focus on kicking only. These are most commonly used with arms extended in front of the body, which increases loading on the shoulder and therefore best avoided in all cases of injury;
  • Pull buoys — used to focus on arm stroke only. The pull buoy is placed between upper legs to prevent kicking while providing buoyancy to the lower body. Because the workload performed by the upper body is increased, pull buoys may be contraindicated in cases of shoulder tendinitis/tendinosis;
  • Paddles — coming in a variety of sizes, paddles are worn on the hands to increase surface area of the hand, which slows down the pull and increases the ‘feel’ of the water while building strength. The increased loading with paddles make them unsuitable in all cases of shoulder pain and injury, especially where stroke technique is less than perfect.

Returning to swim training

Much has been written about pain management and dry land rehab training following shoulder injury. However, the successful return to pain-free swimming training in the water presents a major challenge. All too often, symptoms improve or resolve after rest and dry-land training only to recur once the swimmer is back in the pool. The particular hurdles that need to be overcome at this stage are ironing any stroke imperfections while building up swimming training volume gradually and without overload.

There are two key criteria that need to be achieved before a swimmer can begin a return swimming programme: firstly, the swimmer should be nearly pain free in the shoulder complex and be able to achieve full active extension and external rotation of the glenohumeral joint. Secondly, the strength of the rotator cuff and scapular stabilising muscles should be scored at 5/5 when tested using traditional manual muscle testing15 16.

Dry-land training performed regularly is generally very effective at getting the swimmer to this point. However, it is important for physiotherapists to appreciate that simply handing the swimmer back to the coach without any further support or advice risks further setbacks as the predisposing factors to injury may still be present. A preferred approach is collaboration with the coach to ensure the subsequent training is both measured and appropriate.

In a recently published paper on this topic, Spigelman et al suggest a two-phase approach17:

  • Phase 1 – initially focuses on stroke technique drills to prevent the swimmer from reverting to bad habits that could re-injure the shoulder. During this phase, the distance covered in the pool increases only in small increments to prevent overuse and to allow assessment of how the shoulder is coping with the resumption of training;
  • Phase 2 – once the swimmer has successfully completed phase 1, the focus switches to interval work, which is designed to help build the swimmer’s muscular and cardiovascular fitness levels. During this phase, weekly distance increases in larger increments in order to help build endurance – but only if the swimmer can demonstrate that he or she can tolerate longer practices.

What’s important to bear in mind is that the goal of a return to swimming programme is to gradually return the swimmer to practice; focusing on the swimmer’s speciality stroke or distance is not important at this time. Only when the swimmer can swim reasonable training volumes with correct technique and without pain should event-specific training be considered.

Talk to me!

It follows from the above that good communication is required, both between the swimmer and coach, and between the coach and physiotherapist. The coach needs to communicate with the swimmer the importance of providing constant feedback about how their shoulder is responding to the increasing training load. It should be stressed that any symptoms of pain or discomfort need to be reported immediately so the coach can pause the training if necessary and evaluate the situation. A useful tool in this respect is the ‘Swimming Soreness Rules’, which can help the swimmer recognise pain, and the coach/physio adjust the swimming portion of shoulder rehabilitation in the swimmer’s programme18. These rules are shown in Box 2.


Box 2: The ‘Swimming Soreness Rules’

  • So long as no soreness manifests, increase the total swimming distance by 200300m per day;
  • If the shoulder is sore during the warm-up but the soreness has gone within the first 500-800m of training, repeat a similar workout from the previous day. If the shoulder becomes sore during this workout, cease the workout and take two days off. When returning to the pool, decrease the distance of the session by 300m compared to the last pain-free workout;
  • If the shoulder is sore for more than one hour after swimming, or the next day, take 1 day off and repeat the most recent swimming workout;
  • If the shoulder is sore during the warm-up and the soreness hasn’t gone within the first 500-800m of training, stop immediately and take two days off. When returning to the pool, decrease the distance of the session by 300m compared to the last pain-free workout;
  • If soreness occurs repeatedly despite this graduated return to training, a further evaluation should be made by the physiotherapist.

Criteria for progression

A detailed description of suitable drills and swimming workouts for the swimmer returning to the pool is beyond the scope of this article and will of course depend on the swimmer in question, his/her event, stage of development etc. However, the general criteria for progression from phase 1 to phase 2, and from phase 2 to resuming event-specific training can be given. An example of this in practice is shown in Table 2. It must be emphasised however that the swimmer and coach both need to understand that progression should only be very gradual. Any increases in pain, soreness or discomfort need to be recognised by the swimmer and coach as potential warning signs to decrease or even suspend training while re-evaluation takes place.

Table 2: General criteria for progression

 Phase 1Phase 2 onwards
Typical total distance (metres)1000-1500 1500-22002200-30002800-39003500-4700+
Typical warmup distance
300-400 600-700 700-900900-11001000-1200
DrillsStroke technique using drills (300-500m)Stroke technique using drills (400-600m)Stroke technique using drills (600-700m). Incorporate drills at beginning and end or practiceStroke technique using drills (600-700m). Incorporate drills at beginning and end or practice
Stroke technique using drills (700900m). Incorporate drills at beginning and end or practice
Incorporate a drill set of 1000-1200m at the end of the workout
IntervalsNoneNoneOne set at 70% effort. Gradually increase number of intervals, while maintaining correct stroke technique (500m-1000m maximum)Gradually increase interval pace to that of pre-injury pace while maintaining stroke technique (800m-1300m)
Paddle useNo paddlesNo paddlesNo paddlesNo paddlesNo paddles
Kickboard useNo kickboardNo kickboardNo kickboardKickboard if comfortable
Kickboard if comfortable
Criteria to progress1. Pain-free.
2. Proper stroke technique during drills as per coach’s assessment.
1. Pain-free.
2. Proper stroke technique during drills as per coach’s assessment.
1. Pain-free during and after practice.
2. Ability to maintain good technique, even at end of practice.
3. No shoulder pain during interval work.
(Swimmer rejoins team)
1. Pain-free during and after practice.
2. Ability to maintain good technique, even at end of practice.
3. No shoulder pain during intervals.
1. Completely painfree.
2. Maintain stroke technique.
3. Complete pull buoy work painfree.
4. No shoulder pain during intervals.

Summary

Overuse injuries to the shoulder are all too common in competitive swimmers, especially where training volumes are high and stroke technique is less than perfect. Evaluation by the clinician, rest and appropriate dry-land strengthening exercises are an important first phase of any recovery programme. However, the process of rehab shouldn’t stop there.

The first few weeks in the pool as part of a return to swimming programme are vitally important for a full recovery, and this is a time when cooperation between the clinician and the swimmer’s coach can be extremely useful. During the return to swimming programme, any increase in workload should only be very gradual with an emphasis on correcting any stroke errors rather than rushing the swimmer back to full race fitness. A key part of this process is constant monitoring of and feedback from the swimmer so that the coach and physio can make any adjustments to the programme as needed.

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