The infrasternal angle (ISA) is an angle formed by the cartilage of the lower ribs and the twelfth thoracic vertebra. This angle spans a spectrum from narrow to wide. Generally, individuals with an ISA > 90 degrees are considered “Wide”, while < 90degrees are considered “Narrow”. It has been our experience through assessments at our facility that most “Narrows” fall between 80-90 degrees, while the “wide” guys fall somewhere between 95-105 degrees. The ISA is a representation of a person’s breathing strategy as well as the balance of the internal and external oblique muscles, and the position of the pelvis.
It’s important to note that although we have had athletes that present as a Narrow, they have excelled on the mound with the mechanics generally found in Wide athletes and vice-versa. So, there are no absolutes in this business. However, the ISA can still tell us a lot about an athlete’s “preferred strategy” both in the weight room and on the mound. Let’s get into it…
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