Table 3.

Independent variables used in workload–injury investigations

Workload measure	N
Internal
sRPE	15
Heart rate zones	2
External
Balls bowled or pitched	5
GPS/accelerometry	10
Hours	6

If articles included more than one type of workload variable they are counted more than once. sRPE scores could be the original Foster scale or modified. sRPE is calculated as the product of session intensity on a 1–10 Borg Scale and activity duration in minutes.

GPS, global positioning system; sRPE, session-rating of perceived exertion.