The Relationships Between Hexagonal Barbell One-Repetition Maximum Deadlift and Maximal Isometric Pulls at Three Different Positions

Résumé du livre

The purpose of this study was to examine the relationships between hex barbell (HBB) deadlift one-repetition maximum (1-RM) and force-time characteristics of maximal isometric pulls from the floor, knee, and mid-thigh positions. Twenty-three healthy men and women completed an HBB deadlift 1-RM assessment and a series of three maximal isometric pulls at each position on separate days. The bar positions were set at 22.5 cm above the platform to represent the lift-off phase (FLOOR), just superior to the patella to represent the knee-passing phase (KNEE), and the mid-thigh - defined as the mid-point between the center of the patella and the anterior superior iliac spine (MT). Correlation analyses were performed to assess the relationships present between 1-RM and force-time characteristics at each position. Results of this investigation corroborated the results of past research suggesting that PF would be a significant predictor of maximal strength. Peak force (PF) was observed to have large to very large correlation coefficients to 1-RM at each position. Late-phase rate of force development (RFD) time-bands at the floor and mid-thigh were observed to have the largest relationships to 1-RM, with respect for position. Maximal strength has been related to late-phase RFD; thus, it is not surprising to observe large relationships at later time epochs from the FLOOR and MT positions. Impulse was observed to have a large to very large relationship to 1-RM at the three positions, suggesting future research to further investigate this under-researched relationship is needed.