The infraspinatus muscle is one of the muscles that makes up the rotator cuff. It originates on the infraspinous fossa of the scapula, and inserts on the middle facet of the greater tubercle of the humerus. It functions to externally rotate the humerus and to stabilize the head of the humerus in the glenoid cavity during upward movement of the arm. Trigger points in this muscle refer pain deep into the anterior shoulder joint and down the anterior arm. Trigger points near the lower medial border refer pain into the rhomboids. This muscle is often injured during throwing motions.
Football
Pathophysiology of trigger points.
A large number of factors have been identified as causes of trigger point activation. These include acute or chronic overload of muscle tissue, disease, psychological distress, systemic inflammation, homeostatic imbalances, direct trauma, radiculopathy, infections, and lifestyle choices such as smoking. Trigger points form as a local contraction of muscle fibres in a muscle or bundle of muscle fibres. These can pull on ligaments and tendons associated with the muscle which can cause pain to be felt deep inside a joint. It is theorized that trigger points form from excessive release of acetylcholine causing sustained depolarization of muscle fibres. Trigger points present an abnormal biochemical composition with elevated levels of acetylcholine, noradrenaline and serotonin and a lower ph. The contracted fibres in a trigger point constricts blood supply to the area creating an energy crisis in the tissue that results in the production of sensitizing substances that interact with pain receptors producing pain. When trigger points are present in a muscle there is often pain and weakness in the associated structures. These pain patterns follow specific nerve pathways that have been well mapped to allow for accurate diagnosis or the causative pain factor.
Diagnosis of trigger points.
Diagnosis of trigger points typically takes into account symptoms, pain patterns, and manual palpation. When palpating the therapist will feel for a taut band of muscle with a hard nodule within it. Often a local twitch response will be elicited by running a finger perpendicular to the muscle fibres direction. Pressure applied to the trigger point will often reproduce the pain complaint of the patient and the referral pattern of the trigger point. Often there is a heat differential in the local area of the trigger point. 
Trigger points in the biceps Brachii muscle.
The Bicep Brachii is perhaps the most recognizable muscle in the body. It’s the muscle that is most often flexed when someone says ” show me your muscles”. It is composed of two heads, the long head and the short head. The short head originates on the coracoid process of the scapula, and the long head on the supraglenoid tubercle. Both heads merge to insert on the radial tuberosity and bicipital aponeurosis into the deep fascia on the medial part of the forearm. The main actions of this muscle are elbow flexion and forearm supination(rotation with the palm of the hand going upward). This muscle also assists shoulder flexion. Trigger points in this muscle mainly refer pain into the shoulder, with spillover into the posterior aspect above the scapula. A less common referral is into the anterior elbow and forearm. 
What is a trigger point
Dr Janet travel coined the term trigger point in 1942 to describe clinical findings with characteristics of pain related a discrete irritable point in muscle or fascia that was not caused by acute trauma, inflammation, degeneration, neoplasm or infection. The painful point can be palpated as a nodule or tight band in the muscle that can produce a local twitch response when stimulated. Palpation of the trigger point reproduces the pain and symptoms of the patient and the pain radiates in a predictable referral pattern specific to the muscle harbouring the trigger point.
What to expect with a trigger point massage.
A treatment with Bryan is very user friendly. And, no, you don’t have to remove any clothing. However, bringing a t-shirt and a pair of shorts or sweats is recommended.
The first time you come for a treatment you will be asked to fill out a Client History form. Bryan will go over the information you provide, asking for more detail and discussing the type of pain you are having and its location.
The treatment itself involves locating the Trigger Points in the muscle or soft tissue and applying a deep focused pressure to the Point. This will reproduce the pain and the referral pattern that is characteristic of that pain.
The treatment will be uncomfortable at first, but as the Trigger Points release, the pain will decrease. The pressure will always be adjusted to your tolerance level. If, at any time, you feel too uncomfortable you can ask Bryan to ease off a bit.
Depending on your specific problem, Bryan may also use some stretching and / or range-of-motion techniques, as needed.
After treatment, it is usually recommended that the client apply moist heat to the area treated.
When Are My Shoes “Done”?
Running shoes need to be replaced every 250 miles. There are three basic options:
✓ Motion Control Shoes – Designed for people with low or no arches, these shoes are for runners who strike the ground on the outer edge of their foot. Avoid overly stiff shoes as these decrease you perception of ground strike and lead to new injuries.
✓ Stability or Neutral Shoes – Designed for people with normal or average arches and running mechanics. The shoe contains some cushioning to absorb shock and prevent injuries and some rigidity to avoid pronation.
✓ Cushioned Shoes – Designed for people with high arched feet. Their footprint will typically leave a thin band along the foot’s edge. As they run weight is distributed from heel strike to the outer edge of the foot and small toes that bear the brunt of “lift off.” This shoe is more flexible and absorbs the shock created by the lack or rotation (under-pronation) created by their running style.
Our Condition of the Month: ITB Syndrome
Iliotibial Band Syndrome
Your iliotibial band is a fibrous band of tissue running from the crest of your hip, down to your knee. A muscle near the crest of your hip called the tensor fascia lata, attaches to this band to help control movements of your leg. Your iliotibial band passes over the point of your hip and over another bony bump on the outside of your knee called the lateral epicondyle. When the band is too tight, it can become painfully inflamed as it repeatedly rubs over the top of either of these bony projections. Irritation at the bony bump near the knee is called iliotibial band friction syndrome.
The condition usually presents as pain on the outside of your knee that becomes worse with repetitive knee flexion or extension. This condition is the leading cause of lateral knee pain in runners, especially slower “joggers.” The pain usually develops 10-15 minutes into the workout. You may sometimes feel or hear a click during movement. Symptoms generally ease at rest. Running on slick “wintry” surfaces may aggravate the condition. Excessively worn running shoes may be a culprit.
This problem is commonly caused by weakness in your gluteal muscles. When these muscles are weak, the muscle that attaches to your iliotibial band must contract harder to stabilize your hip. Having one leg longer than another is a known aggravating factor.
Runners should minimize downhill running and avoid running on a banked surface like the crown of a road or indoor track, as well as wet or icy surfaces. Runners should reverse directions on a circular track at least each mile. Bicyclists may need to adjust seat height and avoid “toe in” pedal positions. Avoid using stair climbers or performing squats and dead lifts. Sports cream and home ice massage may provide some relief of symptoms.
My back hurts, why look at my feet?
Improperly supported feet can affect the alignment of all of the structures above. To improve your overall comfort:
✓ Choose shoes with good arch support.
✓ Avoid going barefoot or wearing shoes that lack support (i.e. flip-flops). The following brands of sandals provide better than average arch support: Naot, Fit Flops, Orthoheels, Abeo, Vionic and Yellow box.
✓ Avoid high-heeled shoes or boots (keep heels to a maximum of 1½ inches, especially if you are going to be doing a lot of walking).
✓ “Cross-trainer” athletic shoes tend to provide the best all around support and shock absorption for daily activities.
✓ Patients with fallen arches should consider adding arch supports or orthotics.
✓ Repair or replace shoes with worn soles or heels.
Hamstring Problems?
A great injury prevention movement is the glute-ham raise. Done after a warm up and prior to competition it will significantly reduce the odds of hamstring strains in running athletes in sports like Soccer, Football and Sprinting.
To perform the movement:
Begin in a tall kneeling position on a cushion or pillow.
Partner grabs and holds ankles to ground or hook your feet under a stable surface.
Keeping your torso neutral and your thighs in line with your body, bend forward at the knees, using your hamstrings to control the speed of your forward bend.
Go as far as you can without cramping, pain or falling to the ground.
Aberdeen Chiropractic 