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. 2007 Sep 27;586(Pt 1):113–121. doi: 10.1113/jphysiol.2007.141887

Figure 2. Frequency distribution of total genotype scores.

Figure 2

Frequency distribution of total genotype scores derived from a model sample of 1000 000 randomly generated individuals. Mean score, 50.8; standard deviation, 6.2. The distribution is leptokurtic (i.e. clustered towards the middle; kurtosis statistic 2.5, standard error 0.7; via SPSS v.11), demonstrating that most humans are extremely similar, and thus limited, in terms of their genetic potential for endurance performance. The existence of individuals with very low or very high total genotype scores is clearly restricted, suggesting that any outliers that do exist are extremely unusual individuals.