Monitoring Resistance Training Intensity Using Load-Intercept from The Load-Velocity Relationship Variables: The Case of Deadlift

This study aimed to investigate the feasibility of using deadlift load-velocity (L-V) relationship variables, specifically the load-intercept (<i>L₀</i> ), to monitor resistance training intensity. Fifteen well-trained male and fifteen well-trained female athletes completed two incremental load tests, recording movement mean velocity (MV) until reaching one repetition maximum (1RM) in two sessions. Although <i>L₀</i> (CV = 4.98%, ICC = 0.974) demonstrated lower between-session reliability than 1RM (CV = 3.48%, ICC = 0.989), its reliability was still at an acceptable level. Furthermore, the 1RM/<i>L₀</i> ratio showed acceptable between-subjects variability (CV = 6.39%). Consequently, <i>L₀</i> could serve as an alternative reference for prescribing training intensity in place of the 1RM. Both the %1RM-MV and %<i>L₀</i> -MV relationships were found to be valid for monitoring training intensity in the high-intensity range (absolute error ≤ 4.05%, at around 80% and 90%1RM) but not in the low-intensity range (absolute error ≥ 6.31%, from 40% to 70%1RM). Although not a complete replacement for the 1RM, the %<i>L₀</i> - MV relationship still offers a practical and convenient method for monitoring deadlift training in high-intensity range (above 80%1RM), particularly in settings where frequent assessments are required.