Validity and reliability of visual ratings of the vertical jump

The validity and reliability of visual estimates of the kinematics of the vertical jump as would be common in qualitative analysis of human movement was studied. Sagittal plane videotapes of 12 females performing vertical jumps were rated on two occasions by three samples of subjects: 6 basketball coaches, 10 kinesiology students, and 5 kinesiology professors. Visual ratings were compared to values quantified by biomechanical analysis using the Peak Performance Technologies system. Assistant collegiate basketball coaches were unable to rate discrete body angles in the vertical jump accurately or consistently. Six of 10 college student raters could accurately and consistently rate over-all range of motion. Since only one of the kinesiology professors could accurately and consistently rate range of motion compared to the majority of the students, professional experience did not affect the ability to rate range of motion in the vertical jump in these subjects.