Mean (± Standard Error) shoulder, elbow and wrist normalized positive and negative powers (W) for rackets with low (I_L) and high (I_H) polar moment of inertia during the three phases of the tennis serve, with * for significant difference at p≤0.05, and ** for significant difference at p≤0.01.

<p>Mean (± Standard Error) shoulder, elbow and wrist normalized positive and negative powers (W) for rackets with low (I_L) and high (I_H) polar moment of inertia during the three phases of the tennis serve, with * for significant difference at p≤0.05, and ** for significant difference at p≤0.01.