['Baseball players, specifically pitchers, with symptomatic neurovascular occlusion often initially complain of arm fatigue, loss of ball control, and velocity. As the compression continues complaints may manifest into dull pain, paresthesia, and decreased grip strength.', 'To determine the correlation between upper extremity blood flow volume and grip strength among baseball pitchers.', 'cross-sectional.', 'Athletic training room.', 'Sixty-six professional baseball pitchers (age=21.6±2.0 years; height=186.9±5.7 cm; mass=91.3±10.9 kg) volunteered to participate prior to the start of spring training.', 'Diagnostic ultrasound was used to measure upper extremity blood flow volume with the throwing shoulder in a resting position and in a provocative position. Grip strength was measured with participants seated and their throwing arm elbow flexed to 90°. Pearson product-moment correlation coefficients were used to determine the strength of the relationships between blood flow volume in the two arm positions and grip strength (p<0.05).', 'No significant relationship was found between blood flow volume in the resting position and grip strength (r=.03, p=.81); however a strong positive correlation was found in the second provocative position(r=.67, p=.001). This relationship indicates that as blood flow volume tested in a provocative shoulder position decreases, so does grip strength.'] Is upper Extremity Blood Flow Volume Strongly Correlated with Grip Strength While in a Provocative Shoulder Position Among Baseball Pitchers?