• Muscle activity and kinematic differences between a range of hip dominant resistance exercises

      Maddams, George John Michael (University of Bedfordshire, 2022-04)
      The purpose of this study was to compare four commonly used hip extension exercise from a kinematic and muscle activation perspective to try and identify the best lift for posterior chain (PC) development. Twelve males (age: 19 ± 2 years; height: 1.81 ± 0.81 m; body mass: 85.64 ± 10.87 kg) who were injury-free for the previous six months where included in the study. Ten participants (four aged 17 years old: six aged 18 years old) were selected from a 1 XV Rugby Union scholar athlete training group at Oundle School, and were resistance trained (> 1 years’ experience). Two participants (21 years old) where considered experienced at resistance training (> 3 years). All participants took part in a repeated measure, study design, in which they performed four hip extension exercises: conventional deadlift (CDL), sumo deadlift (SDL), hex bar deadlift (HBD) and hip thrust (HT) at 90% one repetition maximum (1 RM) for three repetitions, and 100% 1 RM for one repetition. A 4 x 2 x 2 ANOVA compared muscle activation, knee and hip kinematics and load lifted at two lifting intensities. Results indicated for 100% 1 RM lifting the erector spinae (ES), rectus femoris (RF), vastus medialis (VM), muscle activity and knee peak joint flexion and joint range of motion (ROM) was significantly greater in the HBD compared to the HT. In 90% 1 RM, ES muscle activation was greater in HBD, and RF, for the HBD, CDL, SDL, compared to the HT. Knee joint ROM was significantly larger in the three styles of deadlift for all lifts compared to the HT. Hip joint peak flexion and ROM was significantly greater in the HT compared to the HBD. Lifting at 90% 1 RM showed a greater global muscle activity when compared to 100% 1 RM. In conclusion, the CDL, SDL and HBD would seem favourable for PC development over HT. The HBD would appear to be the superior lift in regarding muscle activation of the PC, however further evidence is needed.