One Velocity Loss Threshold Does Not Fit All: Consideration of Sex, Training Status, History, and Personality Traits When Monitoring and Controlling Fatigue During Resistance Training

Sports Medicine - Open

Table 1 Factors affecting: (1) number of repetitions performed until reaching a given velocity loss threshold; (2) the velocity of the repetitions associated with the first instance when a given velocity loss threshold was exceeded

Predictors	N of repetitions until reaching velocity loss thresholds			Velocity when first exceeding velocity loss thresholds
	Statistics			Statistics
	Estimates	CI	p	Estimates	CI	p
(Intercept)	6.20	1.83 – 10.56	0.005	0.53	0.37 – 0.68	< 0.001
Day [Day 2]	−0.04	−0.26 – 0.17	0.683	−0.01	−0.01 – −0.01	< 0.001
Sex [male]	−1.44	−2.56 – −0.33	0.011	0.06	0.02 – 0.11	0.005
Load [80% 1RM]	−2.13	−2.39 – −1.86	< 0.001	−0.07	−0.07 – −0.07	< 0.001
Load [90% 1RM]	−4.00	−4.44 – −3.56	< 0.001	−0.14	−0.15 – −0.14	< 0.001
Emotional stability	0.07	0.01 – 0.13	0.027	−0.00	−0.00 – 0.00	0.190
Conscientiousness	−0.00	−0.07 – 0.07	0.925	−0.00	−0.00 – 0.00	0.898
Training experience [> 3 years]	−0.18	−1.05 – 0.70	0.692	−0.00	−0.04 – 0.03	0.872
Repetition practices [8–12]	−0.13	−1.08 – 0.82	0.789	−0.00	−0.04 – 0.04	0.935
Repetition practices [> 12]	0.26	−0.75 – 1.27	0.610	−0.00	−0.05 – 0.04	0.820
Relative strength (1RM/BM)	1.11	−0.18 – 2.39	0.091	−0.04	−0.09 – 0.01	0.083
Loads practices [70–80% 1RM]	–	–	–	0.00	−0.04 – 0.05	0.858
Load practices [> 80% 1RM]	–	–	–	−0.01	−0.06 – 0.04	0.631
Repetitions in reserve practices [> 2 RIR]	–	–	–	0.01	−0.03 – 0.04	0.693
Random effects
σ²	2.80			0.00
τ₀₀ _ID:VL	0.95			–
τ₀₀ _ID	1.34			0.00
τ₀₀ _VL	15.91			0.01
ICC	0.87			0.96
N_ID	46			46
N_VL	13			13
Observations	944			944
Marginal R²/Conditional R²	0.095/0.879			0.131/0.965

Reference groups were the following: Day [Day 1], Sex [female], Load [70% 1RM], Training experience [< 3 years], Repetitions practices [< 8], Load practices [< 70% 1RM], Repetitions in reserve practices [< 2 RIR]
1RM one repetition maximum, BM body mass, RIR repetitions in reserve, ICC interclass-correlation coefficient, R² pseudo coefficient of determination, CI 95% confidence intervals, p p value