Table 1 Description of included studies
From: Is Cumulative Load Associated with Injuries in Youth Team Sport? A Systematic Review
Reference | NOS | Study design | Sport | Population* | Time period | Load definition | Injury definition | |
|---|---|---|---|---|---|---|---|---|
Internal | External | |||||||
Ahmun et al. [29] | 6 | Prospective cohort | Cricket | 39 males (17.5 [0.80] yrs) | 3 years, 5 tours | Session RPE: 10-point RPE × session duration (min) Acute workload: 3 day avg Chronic workload: 14 day avg |  | Medical attention conditions |
Bowen et al. [10] | 4 | Prospective cohort | Football (Soccer) | 32 males (17.3 [0.9] yrs) | 2 seasons | Â | Total distance High-speed distance Total load Accelerations | Time-loss injuries |
Brink et al. [30] | 4 | Prospective cohort | Soccer | 58 males (15–18 yrs) | 2 seasons | Session RPE: 15-point RPE × session duration (hr) Weekly load: sum of sessions over 1 week |  | Any physical complaint from soccer, regardless of need for medical attention or time-loss |
Frisch et al. [31] | 4 | Cross-sectional | Volleyball | 175 female high school athletes | 4Â years | Â | Volume of contacts: self-reported number of serves or spikes in practices during a typical week | Volleyball-related shoulder pain: traumatic and non-traumatic |
Hartwig et al. [32] | 3 | Prospective cohort | Rugby | 93 males (14–16 yrs) | 1 year |  | Training volume (min/wk) Match volume (min/wk) Weekly volume (min/wk) | Rugby-related, time-loss injury or pain |
Lathlean et al. [5] | 5 | Prospective cohort | Australian football | 290 males (17.7 [0.3] yrs | 1 year | Session load: 10-point RPE × session duration (m) 1-wk load 2-wk load 3-wk load 4-wk load |  | Time-loss injuries |
O’Keeffe et al. [7] | 6 | Prospective cohort | Gaelic football | 97 males (13.4 [1.1] yrs) | 1 season | Load: modified RPE × session duration (m) 1-wk load 2-wk load 3-wk load 4-wk load |  | Any time-loss injury sustained during training or competition |
Orr and Cheng [33] | 5 | Prospective cohort | Rugby | 122 males baseline cohort: n = 368 (15.8 [1.0]) | 1 season |  | Weekly physical activity (time spent in team training, additional sporting endeavors, exercise or work/manual labor) | Any physical or medical condition that occurs during participation in rugby league match or training activities that requires medical treatment or results in a missed match or training participation |
Ristolainen et al. [6] | 7 | Cross-sectional | Multi-sporta | 549 males (14–16 yrs) 528 females (14–16 yrs) | 1 year |  | Training hours per week during training season Training hours per week during competition season Amount of competitions | Acute time-loss injuries; overuse injuries |
Visnes and Barr [34] | 5 | Prospective cohort | Volleyball | 69 males; 72 females (16.8 [0.8] yrs) | 4Â years | Â | Number of hours of volleyball, beach volleyball, strength, jump training, and other training Number of sets played in matches during the last week | Jumper's knee |
Watson et al. [35] | 5 | Prospective cohort | Soccer | 75 females (15.5 ± 1.6 yrs) | 20 weeks | Fatigue Session RPE (duration min × intensity 1–10) Daily, weekly (7 day) rolling avg, monthly (28 day) rolling avg |  | Time-loss injuries |