Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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1/2023
vol. 40
 
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abstract:
Original paper

Analysis of velocity- and power-load relationships of the free-weight back-squat and hexagonal bar deadlift exercises

Petrus Gantois
1
,
Fabiano de Souza Fonseca
2, 3
,
Fábio Yuzo Nakamura
1, 4
,
Leonardo de Sousa Fortes
1
,
Jaime Fernandez-Fernandez
5
,
Gilmário Ricarte Batista
1

1.
Associate Graduate Program in Physical Education UPE/UFPB. João Pessoa-PB, Brazil
2.
Federal Rural University of Pernambuco (UFRPE), Recife-PE, Brazil
3.
Graduate Program in Physical Education UFPE, Recife-PE, Brazil
4.
Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), University of Maia (ISMAI), Maia, Portugal
5.
Department of Physical Activity and Sport Sciences, Universidad de León, León, Spain
Biol Sport. 2023;40(1):201–208.
Online publish date: 2022/02/18
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The aim of this study was to analyse the load-velocity and load-power relationships in the freeweight back-squat (BSQ) and hexagonal bar deadlift (HBD) exercises. Twenty-five (n = 25) resistance-trained men (age = 23.7±2.8 years) performed a progressive load test at maximal intended velocity to determine their BSQ and HBD one-repetition maximum (1RM). Mean propulsive velocity (MPV) during the concentric phase of the lift was recorded through a linear encoder. Load-velocity and load-power relationships were analysed by fitting linear regression and the second-order polynomial, respectively, to the data. Maximum strength (1RM), MPV (30–80% 1RM), and power output (30–90% 1RM) were higher for HBD compared to BSQ exercise (p < 0.05). A very strong relationship between MPV and relative intensity was found for both BSQ (R2 = 0.963) and HBD (R2 = 0.967) exercises. The load that maximizes power output (Pmax) was 64.6±2.9% (BSQ) and 59.6±1.1% (HBD) 1RM. There was a range of loads at which power output was not different than Pmax (BSQ: 40–80% 1RM; HBD: 50–70% 1RM). In conclusion, the load-velocity and load-power relationships might assist strength and conditioning coaches to monitor and prescribe exercise intensity in the BSQ and HBD exercises using the velocity based training approach.
keywords:

Kinematic, Resistance exercise, Velocity-based training, Power output, Strength testing

 
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