Detecting the muscle strength levels of the upper limbs plays a significant role in athletes' performance, injury prevention, and rehabilitation. Objective: To estimate the risk of injury to the shoulder rotator muscles at speeds of 60°/s and 180°/s. Method: A descriptive, correlational, cross-sectional study was conducted on 80 amateur athletes who underwent isokinetic testing using the HumacNorm (CSMI) Isokinetic Testing and Rehabilitation System and segmental anthropometry using a seca mBCA554 bioimpedance analyzer. Results: The results were compared to standardized benchmarks in various populations of athletes. High anthropometric correlations were observed, including between the muscle mass of the dominant arm (MMBD) and the muscle mass of the non-dominant arm (MMBND) (p<0.001), as well as isokinetic values at 60°/s between the internal rotators (RI) of MMBD and MMBND (p<0.001) and between 60°/s and 180°/s of the external rotators (RE) (p<0.001). Segmental anthropometry also showed a correlation with isokinetic measurements, such as MMBND and MMBND RE at 60°/s, with a correlation coefficient of r=0.70 (p=0.01). BMI was within the normal range, but deficits were observed for RE180°/s exceeding 10%, and the fatigue index (FI) was high for RI180°/s (p<0.05). Conclusion: Maximum strength, segmental muscle mass, asymmetries, deficits, and FI are variables that can better estimate the risk of injury. However, due to the lack of benchmarks for amateur athletes and limited and incongruent results in other sports disciplines and elite athletes, our findings can serve as initial isokinetic and segmental anthropometry parameters for amateur athletes with a high demand on their upper limbs.