Preliminary Evidence of Transient Fatigue and Pacing During Interchanges in Rugby League

Purpose: This study aimed to quantify changes in heart rate (HR) and movement speeds in interchanged and whole-match players during 35 elite rugby league performances. Methods: Performances were separated into whole match, interchange bout 1, and interchange bout 2 and further subdivided into match quartiles. Mean percentages of peak HR (%HR peak ) and total and high-intensity running (> 14 km/h) meters per minute (m/min) were recorded....