Year of Publication

2019

Date of Thesis

08-2019

Document Type

Thesis

Degree Name

Master of Science

Department

Exercise and Sport Sciences

Abstract

Training to develop power typically involves performing a combination of slow-moving resistance exercises against heavy loads (e.g., back squats) and/or fast-moving exercises against light loads (e.g., jump squats). Hexagonal barbell exercises such as hexagonal barbell deadlift (HBD) and hexagobal barbell jump squats (HBJS) are commonly used alternatives to conventional barbell exercises such as the back squat (BS) and jump squat. The change in load position with these hexagonal barbell exercises appears to allow for greater force, velocity, and power compared to conventional barbell exercises, however knowledge on hexagonal barbell exercises is limited by lack of studies. The current study examined differences in maximum strength between BS and HBD and differences in power characteristics between BJS and HBJS. Twelve resistance trained individuals (9 male, 3 female) volunteered to participate. Participants performed one-repetition maximum (1RM) strength testing in the BS and HBD. Participants also completed loaded jump testing with BJS and HBJS at 0, 10, 20, 30, 40, and 50% 1RM. Jump height and peak power (PP) were measured using a linear position transducer (GymAware, Kinetics, Canberra, ACT). Results showed participants lifted significantly greater 1RM loads using the HBD relative to BS (p < .05). Peak power was greatest for both BJS and HBJS at 0% 1RM. There were no differences in PP between barbell conditions across the six relative loads despite HBJS being performed at greater absolute loads. Analysis of F-v characteristics showed participants demonstrated greater maximum power and maximum force under HBJS compared to BJS conditions (p < .05). The results suggest that HBD and HBJS may provide adequate alternatives to BS and BJS exercises but these alternatives may be more force dominant and provide a greater stimulus for training maximum power. Future research should examine differences in training adaptations for these exercises.

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