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Article Title

BARBELL VELOCITY CAN BE USED TO DETERMINE EXERCISE INTENSITY DURING THE HEX BAR DEADLIFT IN NCAA DIVISION I HOCKEY PLAYERS

Abstract

Marcel Lopes dos Santos1, J. Bryan Mann2, Ricardo Berton3, J. Jay Dawes1

1Oklahoma State University, Stillwater, OK; 2University of Miami, Coral Gables, FL 3University of Sao Paulo, Sao Paulo, Brazil

Strong linear relationships between loads and bar velocity have been reported for several exercises including the standard bar deadlift (SBD). However, small variations regarding the execution of the exercise might affect the entire load-velocity profile (LVP). For instance, the use of lifting straps is sufficient to alter the entire SBD LVP of resistance-trained individuals. For this reason, a LVP specific for the hex bar deadlift (HBD) needs to be determined. PURPOSE: The purpose of the study was to determine the LVP of the HBD to estimate the 1RM based on HBD bar velocity. METHODS: Twenty-two (n = 22) NCAA Division-I hockey players participated in this study (age= 21.0 ± 1.5 yrs, height= 182.9 ± 7.3 cm, weight= 86.2 ± 7.3 kg). A repeated-measures design was used to investigate the load-velocity relationship. Initial loads were based on players’ recorded 1RM tests. Players executed 5 reps at 65%, 3 reps at 75%, 3 reps at 80%, 2 reps at 90%, and 1 rep at 95% 1RM. After that, increments of 2-5 kg were made until the players reached their 1RM. An individualized linear regression between peak concentric velocity and load used in the 1RM test was performed for each participant. Peak concentric velocity at 1RM of each participant was applied to predict the 1RM value. RESULTS: Load velocity relationship overestimated the 1RM of 18 participants (81.9%), and underestimated the 1RM of only 4 participants (18.1%). Absolute errors ranged from -4.56 to 12.83 kg, while the mean was 4.19 ± 5.13 kg. Typical error was 3.72 (CI95%= 2.83, 5.44) and the coefficient of variation was 1.78 (CI95%= 1.41, 2.59). CONCLUSION: The HBD prediction equation demonstrated to be very accurate. This is relevant for trainers and coaches prescribing the HBD for athletes. Bar velocity can be used to determine and alter the HBD training load. By assessing bar velocity across training sessions, trainers and coaches can monitor athletes’ progress and have greater control over their current fatigue levels. A limitation of this method is that it is population-specific.

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