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Validation of a Video-Based Game-Understanding Test Procedure in Badminton

Minna T. Blomqvist, Pekka Luhtanen, Lauri Laakso, and Esko Keskinen

The purpose of this study is to report on the development and validation of a game-understanding test procedure in badminton. A basic video-based test was constructed, and primary school children (ages 9–10 and 11–12 years, N = 120) served as participants. An advanced test was designed to detect differences between national level junior badminton players (11–14 years, n = 19) and primary and secondary school children (11–14 years, n = 45). The video-based tests consisted of 15 to 19 different sequences that were simulations of actual offensive and defensive game situations. In every sequence, players were to solve tactical problems by selecting appropriate solutions and arguments for their decisions. Validity and reliability of the tests were examined through these groups, and the findings suggest that the test procedure developed provides a valid and reliable method for assessing game understanding in badminton.

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Photocell Contact Mat: A New Instrument to Measure Contact and Flight Times in Running

Jukka T. Viitasalo, Pekka Luhtanen, Harri V. Mononen, Kare Norvapalo, Leena Paavolainen, and Matti Salonen

A new instrument, the photocell contact mat (PCM), was developed to measure ground contact time and flight time as well as step and stride frequency as a function of running time or running distance. The purpose of this study was to evaluate the validity and accuracy of PCM measurements against simultaneous force platform measurements. Effects of striking pattern (sprinter or long-distance), running velocity, and height of the PCM from ground level on the contact parameters were analyzed. One male sprint runner and one male distance (marathon) runner volunteered as subjects. The time difference between the PCM and force platform determinations linearly increased as a function of the PCM height and decreased as a function of running velocity (except for the lowest 10 mm PCM height). The low coefficients of variation found between corrected PCM contact times and force platform contact times suggested that the PCM is an accurate instrument to measure ground contact times.