A simple additive model of genes plus environment, based on intrapair similarities observed in 35 MZ and 35 like-sexed DZ twin pairs, was used to estimate the relative contribution of genetically controlled phenotypic variance in psychomotor individuality. Subjects practiced 50 trials on a pursuit rotor apparatus under a 20-sec/20-sec, work-rest schedule with a 30 min rest pause allowed between trials 30 and 31. Analyses of the data disclosed that a greater proportion of genetic factors, as opposed to nongenetic factors, appears to account for existing individual differences in motor performance among individuals subject to similar environmental conditions. The strength of this genetic control, however, systematically diminished throughout the course of practice obeying a monotonic trend over trials.
The purpose of the present field study was to examine the predictions of Multidimensional Anxiety Theory (MAT; Martens et al., 1990) with elite male wheelchair basketball players. Thirty-seven elite male wheelchair basketball players completed the CSAI-II prior to each of three tournament games. Results were analyzed using the intraindividual procedures recommended by Sonstroem and Bernado (1982), and separate polynomial trend analyses were used to test the predictions of MAT. Results did not provide statistical support for MAT in that there were no reliable trends between cognitive state anxiety, somatic state anxiety, state self-confidence, and basketball performance. Avenues for future research are suggested.
This study examined the performance and internal consistency reliability of the Random Number Generation test of attention over repeated trials. Performance remained stable when the first trial was omitted from the analysis, while reliability coefficients ranged from 0.67 to 0.78.
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