Background: Concurrent strength and endurance training could interfere with adaptation, which primarily affects long-term strength development. However, so far, research on this theme has rarely focused on ways to optimize concurrent strength and endurance training in team sports. Objectives: This paper aims to summarize the literature on the effects of concurrent training on aerobic and anaerobic energy pathways as well as strength and jump performance measures in team sports (invasion games) to provide recommendations for its application. Methods: A systematic literature review according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines was conducted. Various reliable sources with only experimental studies investigating the effect of concurrent training on sport-specific performance measures in team sports (invasion games) were included. Two researchers independently evaluated the risk of bias with the Physiotherapy Evidence Database scale. Results: From 1649 records, 24 were included: 12 in children/adolescents (n = 428; aged up to 18 years) and 12 in adults (n = 620; aged 19–30 years), respectively. Thirteen of 24 studies reported improved endurance (V˙O2max, YoYoIR) and strength (CMJ, SJ and 1RM) performance by adding additional resistance training in young and adult team sport players with different training status, and nine of 24 studies reported more pronounced interference effects in older and more experienced players. Discussion: Concurrent training can improve endurance and strength performance in team sports athletes. However, it is revealed that concurrent training can lead to diminished effects, which might be minimized by extended recovery time between sessions, adapted sequencing order and endurance exercise modality. With maturity and developing training status, an increased importance of these variables was documented.
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