Interval tennis rehabilitation programs (ITRPs) are advocated during later stages of shoulder and elbow rehabilitation. ITRPs utilize gradual increases in hitting or serving effort, based on perceived effort. Over-estimation of effort may increase stress. This investigation purpose was to determine actual tennis serve velocity when asked to hit serves at perceived effort of 50%, 75%. Thirty-nine healthy college tennis players performed a warm-up of groundstrokes and serves. Five maximal effort serves (100% velocity) functioned as the 100% maximal effort serve. Then, five serves were hit at each of two randomly determined velocities. The average of five trials for maximum effort (100% velocity) was calculated. Based on this number, 75% and 50% of maximum velocity was determined. Using one-sample t-tests, the subjects’ perceived efforts were compared against computed percentages. Differences were found between perceived effort and calculated percent. Overall, actual velocity served was greater than percieved. Because velocity at 100% effort was significantly different for males and females, a separate analyses was done by gender. Both males’ and females’ perceived velocities were significantly greater (p < .05) than the athletes’ computed velocities at 75% and 50%, respectively. Perceived serve effort does not equate to actual ball velocity. A need exists to use other measures to determine effort or intensity during ITRPs. Serving at higher velocity levels early after musculoskeletal shoulder or elbow injury may increase the risk of re-injury or lack of progression. This study provides clinicians with guidance for the progression of tennis players during an interval program.

在肩膀和肘部康复的后期阶段提倡间隔网球康复计划（ITRP）。ITRP根据感知到的努力，逐渐增加击球或发球的努力。高估工作量可能会增加压力。这项研究的目的是确定被要求击打发球时实际网球发球速度，感觉力度分别为50％和75％。39名健康的大学网球运动员进行了热身和发球热身。五个最大功（100％速度）用作100％最大功。然后，以两个随机确定的速度各击中五发。计算了五个最大努力（100％速度）试验的平均值。基于此数字，确定最大速度的75％和50％。使用一样本t检验，将受试者的感知努力与计算出的百分比进行比较。发现感知的努力与计算的百分比之间存在差异。总体而言，实际服务速度大于预期速度。由于男性和女性在100％努力时的速度显着不同，因此按性别进行了单独的分析。男性和女性的感知速度分别显着高于运动员的计算速度（p <.05）（分别为75％和50％）。感知发球努力并不等于实际球速。存在使用其他措施来确定ITRP期间的工作量或强度的需求。在肌肉骨骼肩部或肘部受伤后提早以较高的速度服役，可能会增加再次受伤或无进展的风险。