Approximately two-thirds of the distal biceps tendon ruptures occurred in patients between the ages of 35 and 54. Men accounted for 95% of the distal biceps tendon ruptures in the national database. A forced hyperextension of the arm was involved in 79% of the cases. These activities included waterskiing, golf, wrestling, basketball, and riding a mechanical bull. Smoking and an elevated body mass index (BMI) seem to increase the risk of injury.
Source: American Journal of Sports Medicine, published online June 10, 2015