Elite swimmers are individual athletes competing mostly on their own. However, when competing in a relay team, they are exposed to social influences possibly leading to effort gains compared to their individual performance. This study investigated effort gains in relay team members during 4 × 100 m freestyle races of Olympic Games and World Championships across the past 20 years. We assumed increasing effort gains in swimmers competing on later serial positions within their relay team since weaknesses in their performances can increasingly less be compensated by their teammates (social indispensability). Furthermore, we assumed a stronger gain in female athletes since females have been shown to be more affected by social indispensability then males. Using linear mixed modelling analyses, we additionally examined the moderating impact of the relay team outcome (i.e. medal-winning chance) on effort gains and indispensability effects while accounting for current team rankings at change-over. Except for the first swimmer, overall effort gains in relay performances were found as compared to performances in individual races during the same championship. Furthermore, these gains were close to equally distributed among both laps of the 100 m distance. However, even though effort gains are tending to be most pronounced for the last relay team swimmer we failed to detect any significant indispensability effect in our data set. Noteworthy, female swimmers showed larger effort gains when winning a medal (based on the current team rankings) was likely. In contrast, males showed effort gains irrespective of the serial order within the relay team and medal chance. Consequently, tentative recommendations are derived on how to line up a relay team.
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