Table 1.

Selection criteria used in the meta-analysis

Category	Inclusion criteria	Exclusion criteria
Population	Healthy water sport athletes, with no restrictions on their fitness or competitive level, sex, or age	Participants with health problems (e.g. injuries, recent surgery), precluding participation in a plyometric jump training programme
Intervention	A plyometric jump training programme, with a minimal duration of ≥ 3 weeks, which included unilateral and/or bilateral jumps, which commonly utilize a pre-stretch or countermovement stressing the stretch–shortening cycle	Exercise interventions not involving plyometric jump training (e.g. upper-body plyometrics only training interventions) or exercise interventions involving plyometric jump training programmes representing less than 50% of the total training load (i.e. volume, e.g. number of exercises) when delivered in conjunction with other training interventions (e.g. high-load resistance training)
Comparator	Active control group (i.e. athletes participating in regular training schedules) Studies comparing different plyometric jump training approaches (e.g. different intensity) without active control group, or traditional control group (i.e. non-active participants) will also be considered, as well as specific-active control groups (e.g. involving alternative training methods such as high-load resistance training)	Absence of control group
Outcome	At least one measure related to physical fitness (e.g. countermovement jump height; body fat) and/or sport-specific performance (e.g. 50-m swimming speed) before and after the training intervention	Lack of baseline and/or follow-up data
Study design	Multi-arm trials	Single-arm trials/observational studies