Sports Medicine Research: In the Lab & In the Field: Identifying Adaptations Associated with Shoulder Pain in Swimmers (Sports Med Res)
Monday, August 13, 2012

Identifying Adaptations Associated with Shoulder Pain in Swimmers

Risk factors associated with shoulder pain and disability across the lifespan of competitive swimmers.

Tate A, Turner GN, Knab SE, Jorgensen C, Strittmatter A, Michener LA. J Athl Train. 2012;47(2):149-58.
http://www.ncbi.nlm.nih.gov/pubmed/22488280 (Full text is available for free)

Swimming is a sport that is commonly associated with shoulder injury and pain.  Similar to other overhead sports there are anatomic and biomechanical adaptations that occur but in swimming it is often more difficult to detect due to swimming being a bilateral sport.  In addition, it is still unknown which of the adaptations are linked to shoulder pain and disability which makes creating injury prevention programs difficult.  Therefore, the purpose of the study was to determine if swimmers with shoulder pain (in 4 age groups; 8-11 years, 12-14 years, 15-19 years, and masters) had different physical characteristics, training methods, or swimming exposures compared to swimmers without shoulder pain.  The study included 236 female swimmers ranging in age from 8 to 77 years old.  The swimmers completed three questionnaires to determine their swimming exposure, shoulder pain and dissatisfaction (Penn shoulder score), and shoulder function (Disabilities of the Arm, Shoulder and Hand; DASH).  In addition, the authors measured several physical characteristics, which included passive shoulder range of motion (ROM), shoulder strength, pectoral muscle length, core endurance, and scapular dyskinesis.  For shoulder ROM, they assessed internal and external rotation at 90° of abduction, flexion (with the elbow maximally flexed) for triceps tightness, and flexion (with shoulder external rotation) for latissimus dorsi tightness.  For strength, the authors assessed internal and external rotation at 90° of abduction, horizontal abduction, shoulder elevation, serratus anterior, lower and middle trapezius.  Pectoral muscle length was measured at rest and on stretch at 90° of abduction.  Core muscle endurance was assessed with the side bridge test.  One examiner assessed scapular dyskinesis visually with a grading scale of normal, subtle, or obvious dyskinesis (winging or abnormal movement) with weighted shoulder flexion and abduction.  They found that young swimmers (under 12 years old) had shoulder pain; however, older swimmers had pain, dissatisfaction, and disability.  High school swimmers had the most reported exposure and shoulder symptoms.  Exposure and previous injury was found to be associated with shoulder pain in the high school and masters groups.  Participation in another sport was associated with less shoulder pain.  The young symptomatic swimmers (under 12 years old) were found to have reduced shoulder ROM (flexion and latissimus dorsi tightness), muscle weakness (middle trapezius and internal rotation).  While the 12 years or older symptomatic swimmers had reduced pectoral muscle length and decreased core endurance. 

This is the first study of its kind in swimming and I commend the authors on an extremely great job of providing a complete examination of swimmers.  Examining a large amount of physical characteristics in swimmers across the lifespan will allow clinicians to identify the adaptations that develop in swimmers in the presence of pain.  To identify true risk factors longitudinal studies are required.  However, similar to studies in baseball, the authors found that exposure was related to shoulder pain.  Baseball has recently adopted pitch limits in youth leagues; however, swimmers have no such regulations in place.  Swimmers often practice twice a day and 5 to 6 days a week.  Clearly this amount of repetition may be problematic and may need to be addressed in swimming.  Several physical characteristics were found to be associated with shoulder pain.  Shoulder flexibility and pectoral muscle length are were associated with shoulder pain and are easy to address by implementing stretching programs to address these negative adaptations.  The question still remains at what point do these athletes have too much flexibility?  In addition, muscle strength and endurance seem to be problematic.  Again, these factors are easily corrected in prevention programs.  Imbalances at the shoulder and core can weaken the kinetic chain and therefore cause compensations or increased amounts of stress on certain tissues.  Do you see similar adaptations in your swimmers?  Do you perform a preseason screen on your swimmers to identify these adaptations?

Written by: Stephen Thomas
Reviewed by: Jeffrey Driban

Recent Posts:

Tate A, Turner GN, Knab SE, Jorgensen C, Strittmatter A, & Michener LA (2012). Risk factors associated with shoulder pain and disability across the lifespan of competitive swimmers. Journal of athletic training, 47 (2), 149-58 PMID: 22488280

5 comments:

samwalton said...

This is my first year working with swimming and I must say that I have been impressed with both the ranges of motion that my swimmers possess in their shoulders and with the amount of training they can endure. We have just reached a place in our season where I am starting to see the effects of fatigue and rounded shoulder posture rearing its ugly head in the form of shoulder pain and dysfunction.
I have begun to address this with some scapular tracking exercises, postural control training and stretching (where necessary) but I'd LOVE to hear what other people with more experience are doing to address these issues. Anything will help I'm sure!

Stephen Thomas said...

Sam thanks for your comment. I glad to see you are being proactive with your swimmers and attempting to prevent these adaptations from occurring. You are correct that with the amount of training it is often very difficult to completely prevent some of these adaptations from occurring. If athletes are becoming symptomatic it may be a good idea to speak with the coach and present some information on the changes you are seeing and explain that it is due to fatigue and overuse. At certain points of the season it way be useful to "cut back" on the hours in the pool and spend more time with dry land training. This clearly isnt a complete shut down from swimming but enough of a "cut back" that allows the athletes slightly more time to recover and in turn your prevention work can catch up. Unfortunately without a "cut back" you are essentially fighting and up hill battle. In the end this will not only prevent injuries but also improve performance.

Dave Logerstedt said...

Stephen,

Your title is a little misleading. This was a cross sectional study so it is erroneous to describe these as adaptations or risk factors. We don't know if it is a chicken or egg scenario. Do these swimmers develop pain and then compensate or do the impairments develop resulting in pain?

However, I have encourage that investigators are pursuing this. What needs to occur now is a prospective longitudinal study to investigate the natural course of shoulder pain in swimmers and then develop an interventional study to address impairments that predict pain or dysfunction in swimmers.

Stephen J. Thomas, PhD, ATC said...

Dave thanks for the comment. You are correct that this is a cross sectional study and it is unable to determine causality however the title does not imply causality it just suggests an association between adaptations and shoulder pain.

The difficulty with prospective longitudinal studies is that adaptations may be occurring as soon as an athlete swims for the first time. Therefore, tracking athletes at a very young age if often difficult but I do agree this type of research is needed. Thanks for reading and commenting!

Dave Logerstedt said...

Agreed. It is going to be difficult to truly understand these overuse type injuries, whether it is swimming, running, throwing, etc. It is going to take a huge collaborative effort. Hopefully, with the advancement of technology, some of the questions can be answered.

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