BACKGROUND: Current monitoring strategies rely on expensive or laboratory-based tools, limiting their daily applicability. The aim of this study was to describe an accessible, low-cost monitoring system integrating neuromuscular, technical, and load-quality markers in an Argentine elite female distance swimmer (age: 19 y; Tier 5; FINA Points [2019]: 1500 m freestyle: 908 Points]. METHODS: A longitudinal case study was conducted over a 12-month competitive season. Neuromuscular status was monitored using the countermovement jump (CMJ) assessed with the My Jump 2 application before and after the Monday strength sessions, whose main exercise was the squat. Technical transfer was evaluated through a wall-exit index, defined as the time from wall push-off to 7 m, recording both mean values and intra-session dispersion. Training-load quality was assessed using intra-session monotony of barbell velocity measured with an accelerometer (Beast) during squat exercises. Strength-training frequency was periodized across the season (4, 3, and 2 sessions per week). RESULTS: Peak competitive performance coincided with low dispersion (<3%) across indicators rather than with maximal absolute values. The best wall-exit index (3.1 s; dispersion <3%) occurred prior to Olympic qualification (World Aquatics A standards in 400, 800, and 1500 m freestyle). Later phases showed stable technique with reduced transfer. CMJ responses clearly reflected the neuromuscular demands of the 4-, 3-, and 2-session strength phases and guided load dosing decisions throughout the season. Intra-session monotony stabilized below 3% during peak competitive periods. CONCLUSIONS: The integrated use of CMJ, wall-exit index, and intra-session monotony represents an accessible, sensitive, and low-cost monitoring system for elite distance swimmers. Indicator consistency emerged as the clearest correlate of peak competitive performance
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