Effects of velocity loss threshold within resistance training during concurrent training on endurance and strength performance.

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Purpose: this study analyzed the effects of three training interventions: isolated 6 endurance training (ET) and two concurrent training (CT), which differed in the velocity 7 loss magnitude allowed during the resistance training set: 15% (VL15) vs. 45% (VL45), 8 on strength and endurance running performance. 9 Methods: Thirty-three resistance- and endurance-trained men were randomly allocated 10 into three groups: VL15, VL45 and ET. Endurance training was similar across all groups. 11 The CT groups differed in the velocity loss allowed during the resistance training set. 12 Before and after the 8-week training program the following tests were performed: 1) 13 running sprints; 2) vertical jump; 3) progressive loading test in the squat exercise; and 4) 14 incremental treadmill running test up to maximal oxygen uptake (VO2max). 15 Results: Significant differences (P < 0.001) in resistance training volume (~401 vs. 177 16 total repetitions for VL45 and VL15, respectively) were observed. Significant 'group' x 17 'time' interactions were observed for vertical jump and all strength-related variables: the 18 CT groups) attained significantly greater gains than ET. Moreover, a significant 'group' 19 x 'time' interaction (P = 0.03) was noted for velocity at VO2max. Although all groups 20 showed increases in velocity at VO2max, the VL15 group achieved greater gains than the 21 ET group. 22 Conclusions: CT interventions experienced greater strength gains than the ET group. 23 Although all groups improved their endurance performance, the VL15 intervention 24 resulted in greater gains than the ET approach. Therefore, moderate velocity loss 25 thresholds in resistance training performed during CT could be a good strategy for 26 concurrently maximizing strength and endurance development

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