Determination of Vertical Jump as a Measure of Neuromuscular Readiness and Fatigue.Watkins, Casey M.; Barillas, Saldiam R.; Wong, Megan A.; Archer, David C.; Dobbs, Ian J.; Lockie, Robert G.; Coburn, Jared W.; Tran, Tai T.; Brown, Lee E.Journal of Strength & Conditioning Research: Post Acceptance: September 06, 2017 doi: 10.1519/JSC.0000000000002231 Original Research: PDF Only Abstract Coaches closely monitor training loads and periodize sessions throughout the season to create optimal adaptations at the proper time. However, only monitoring training loads ignores the innate physiological stress each athlete feels individually. Vertical jump (VJ) is widely used as a measure of lower body power, and has been used in post-match studies to demonstrate fatigue levels. However, no pre-training monitoring via VJ performance has been previously studied. Therefore, the purpose of this study was to determine the sensitivity of VJ as a measure of readiness and fatigue on a daily sessional basis. Ten healthy resistance trained males (mass= 91.60 kg+/- 13.24 kg; height= 179.70 cm+/- 9.23 cm; age= 25.40 yrs+/- 1.51 yrs) and seven females (mass= 65.36 kg+/- 12.29 kg; height= 162.36+/- 5.75 cm; age= 25.00 yrs+/- 2.71 yrs) volunteered to participate. VJ and BRUNEL Mood Assessment (BAM) were measured four times: pre-workout one, post-workout one, pre-workout two, and post-workout two. Workout intensity was identical for both workouts, consisting of four sets of five reps for hang cleans, and four sets of six reps for push presses at 85% 1RM, followed by four sets to failure of back squats, Romanian deadlift, and leg press at 80% 1RM. The major finding was that VJ height decrement (-8.05 cm+/- 9.65 cm) at pre-workout two was correlated (r=.648) with back squat volume decrement (-27.56%+/- 24.56%) between workouts. This is important for coaches to proactively understand the current fatigue levels of their athletes and their readiness to resistance train. Copyright (C) 2017 by the National Strength & Conditioning Association.