Repeated-sprint performance decrement

Method

Decline in output across successive maximal sprints within one bout, expressed as a percentage decrement or fatigue index. Sprint count and recovery interval recorded on the edge.

The method is part of the endpoint identity. Studies measuring the same quantity by a different method are held as separate endpoints.

Notes

"Sdec" declared 2026-08-27, after a claim both passes agreed on was refused with "Sdec shares no vocabulary with CAT:outcome/repeated-sprint-decrement". It is the standard symbol in the repeated-sprint literature and the FIFTH of this shape after FBG, LOS, WBC and FMD. Like WBC and FMD, and unlike LOS, it abbreviates the WHOLE endpoint rather than a substring two endpoints share, and no sibling contests it — so declaring it discriminates rather than merges. NOT subjective-fatigue, and this pair is why that node's definition was tightened. This is an objective ratio derived from measured sprint times; subjective-fatigue is a score a participant reports. One trial in the survey moved them in different directions.

Findings

1 finding from 1 compound, strongest first.

• L-citrulline — decreases

  DPreliminaryGrade D, Preliminary. Non-human or in vitro only.Finding

  “RSP was improved (i.e., evidenced by a decrease Sdec) in CM compared to PLA (Sdec: CM, 4.68 ± 1.82% vs. PLA, 6.10 ± 1.83%; p = 0.034; ES = 0.77) (Figure.”

  Study

  crossover

  Participants

  13

  Duration

  3 days

  Dose

  Citrulline malate (CM1000, ROS Nutrition), eight 1000 mg tablets daily (8 g/day), taken with breakfast on the two days before and on the morning of each trial.

  Population

  Thirteen male university-level team sport athletes drawn from rugby union, soccer, Gaelic games and field hockey squads, aged 18-30 years and tested during their competitive season.

  Effects of 3 days of citrulline malate supplementation on short-duration repeated sprint running performance in male team sport athletes.2024PMID:38874989