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Swimming g is regarded as the ideal form of exercise because it is so injury-free. Physical problems only really emerge as a result of competitive training, combined with heavy land training. The result? Over-use or repetitive microtrauma injuries such as swimmer's shoulder and breast-stroke knee . These two terms are just generalised names for a variety of injuries that can occur at the shoulder or knee joint because of the heavily repetitive nature of competitive swimming. This stress can be appreciated if you imagine a swimmer training 200-300 lengths per session, x 8+ sessions per week for eight months of the year - those arms certainly circle a lot of times! This is why efficient technique (with regular assessment) and even diet are vital to ensure a swimmer's competitive career is as injury-free as possible.

Swimmer's shoulder is more properly known as painful arc/ rotator cuff tendinitis, or shoulder impingement. In swimmers, painful arc/rotator cuff pain in the shoulder can occur in any of the following movements:
1 Adduction of the arm at the shoulder (when the extended arm is lifted sideways to vertical, away from the mid-line of the body)
2 When this movement is blocked
3 Flexion of the arm at the shoulder (when the extended arm is lifted out in front)
4 When this movement to left or right is blocked.
Pain occurs in the arc between 80-110 degrees. If little strength can be put against blocked movement, there could be a tear in the rotator cuff. Cause: over-use of any of the four shoulder muscles, poor blood supply or poor swimming efficiency and technique. This form of trauma often accompanies shoulder impingement. Treatment involves rest and assessment of the swimmer's bio-mechanics in order to identify any faults that may contribute to the injury. It is also important to look at the land conditioning or weight traning the swimmer is undertaking, again to identify possible injury factors.
The acromioclavicular joint (where the clavicle and scapula meet) may develop degenerative arthritic changes, particularly from damage in resistance weight traning. The repetitive motions of swimming may also stress this joint. The problem is usually treated conservatively with rest; however, if there is no satisfactory response, non-steroidal anti-inflammatory drugs, local heat and ice contrast and occasionally a cortisone injection may be needed.
Arthritis of the glenohumeral joint (where the head of the humerus meets the glenoid cavity) may be seen in the masters age group, though it is rare in the young. Inflammatory arthritis (rheumatoid) may, however, affect the young athlete; it destroys the surface of the joints. Massive arthritic destruction of the glenohumeral joint may require prosthetic joint replacement or joint fusion. Obviously neither would allow an athlete to effectively take part in competitive swimming.
Where the force comes from
The propulsive force of a swimmer comes from the upper body, with the legs acting as stabilisers and providing little propulsion. The shoulder joint must withstand repetitive microtrauma and is subject to overuse syndromes. However, not all swimmers who train under similar conditions develop significant interfering shoulder problems - most will escape any ill effects. The most powerful swimming muscles are the adductors and internal rotators (subscaplaris, supraspinatus and teres major). In an unstable shoulder, the external rotators will be required to do extra work to restrain the humeral head from anterior translation during the press and in-sweep phases of the freestyle stroke. This can lead to overload, fatigue and secondary inflammation, and may account for the common complaint of posterior pain in an individual with anterior shoulder subluxation or dislocation.
Strengthening of the rotator-cuff muscles provides the best stability to the joint and decreases the chance of hypermobility. Military press (shoulder press), side raise with dumbbells (with external rotation), medicine ball exercises, lateral pull-downs and seated rows are examples of a few.
Dealing with breast-stroke knee
While the alignment of the knee centre relative to the hip centre during the start of the breast-stroke kick affects the development in the medial collateral ligament (which stabilises the knee on the inside of the leg) and capsule. The optimum initiating position from the breast-stroke kick is with the hip and knee centres aligned. When the knee centre is narrow or wide of the hip centre, it causes increased stress on the medial collateral joint structures. Exceeding the elastic limits of the ligament will cause damage and injury. In young swimmers, this form of stress could open growth plates of the femur and tibia and cause micro-injury which will result in inflammation and thus seriously impair training. If you're a coach, what's the breast-stroke kick like in your younger swimmers?
Finally, there is a high risk of the patella (knee-cap) riding laterally during the breast-stroke kick. This is magnified when the patella tendon attachment site at the tibial tubercle is placed in an extremely rotated position. This is measured clinically as the Q angle. Weakness of the vastus medialis (the inner thigh muscle which is part of the quadriceps) can decrease effectiveness in ensuring central tracking of the patella. If dislocation occurs, surgery is almost certain. Other minor causes include weak abductors and decreased flexibility of the hamstrings, adductor muscles and the iliotibial band. The patella in particular will be tender if palpated. Treatment can be confirmed by x-rays (to determine the lining of the patella and tendons) and focus on reducing the inflammation. When planning land conditioning for swimmers, I strongly recommend, especially for breast-stroke swimmers, including a range of quadriceps exercises such as squats, leg press, cycling, lunges and leg extensions, and also leg raises for the abductor and adductor muscles, followed by quality stretches.
The fibrocartilagenous meniscus (pad-like structures protecting bone ends) of the knee may be injured during combined bending and twisting movements. As the knee flexes under a load, the meniscus can become trapped between the joint surfaces, causing a shearing force that produces a tear. The signs of such an injury include a popping and sapping noise, and buckling and possible locking of the knee. Unfortunately, meniscus tears do not heal at all well and may need arthroscopic surgery. In masters swimmers, generative arthritis or wearing of the knee surface may also result in tearing of the meniscus and is not uncommon.

Tips To Prevent Swimming Injuries

Each yearlarge amount of swimming-related injuries are treated in hospitals, doctors' offices, clinics, ambulatory surgery centers, and hospital emergency rooms.

  • Always take time to warm up and stretch. Research studies have shown that cold muscles are more prone to injury. Warm up with jumping jacks, stationary cycling or running or walking in place for 3 to 5 minutes. Then slowly and gently stretch, holding each stretch for 30 seconds.

  • Learn how to swim and do not swim alone. Swim in supervised areas where lifeguards are present. Inexperienced swimmers should wear lifejackets in the water.

  • Do not attempt to swim if you are too tired, too cold, or overheated.

  • Avoid diving into shallow water. Each year approximately 1,000 disabling neck and back injuries occur after people went headfirst into water which was shallow or too murky to see objects.

  • Swim in a pool only if you can see the bottom at the deepest point; check the shape of the full diving area to make sure it is deep enough.

  • Dive only off the end of a diving board. Do not run on the board, try to dive far out, or bounce more than once. Swim away from the board immediately after the dive, to allow room for the next diver. Make sure there is only one person on the board at a time.

  • When swimming in open water, never run and enter waves headfirst. Make sure the water is free of undercurrents and other hazards.

  • Do not swim in a lake or river after a storm if the water seems to be rising or if there is flooding because currents may become strong. The clarity and depth of the water may have changed, and new hazards may be present.

  • Check weather reports before going swimming to avoid being in the water during storms, fog, or high winds. Because water conducts electricity, being in the water during an electrical storm is dangerous.

  • Remember that alcohol and water don't mix. Alcohol affects not only judgment, but it slows movement and impairs vision. It can reduce swimming skills and make it harder to stay warm.

  • Be knowledgeable about first aid and be able to administer it for minor injuries, such as facial cuts, bruises, or minor tendonitis, strains, or sprains.

  • Be prepared for emergency situations and have a plan to reach medical personnel to treat injuries such as concussions, dislocations, elbow contusions, wrist or finger sprains, and fractures.

         
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