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Mori K, North TD, Cheng KJ, Baek S, Alvis HB, Kwon YH. Effects of two-step golf swing drills on rhythm and clubhead speed in competitive juniors. Sports Biomech 2024:1-15. [PMID: 38623642 DOI: 10.1080/14763141.2024.2336946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Accepted: 03/26/2024] [Indexed: 04/17/2024]
Abstract
Vertical and horizontal rhythms are crucial aspects of a dynamic golf swing, and the two-step swing drills (TSSD) were specifically designed to promote rhythmic unloading and loading of the legs. The purpose of this study was to evaluate the effects of a TSSD training session on the swing rhythm and clubhead speed (CHS) among competitive junior golfers (3.1 ± 4.4 hcp). The driver swings (7 swings each) of 10 competitive junior golfers (aged 15-18) were captured before and after a TSSD session consisting of four stages (lasting less than 45 minutes). Post-TSSD training, there were significant increases in CHS (p < .001), maximum unweighting (p = .006), the trail-side push (p = .009), the horizontal motion ranges of the body and pelvis (p = .005-.031), the upward/downward motion range of the body in the backswing (p = .042/.024), and the backswing/downswing angular velocity peaks of the axle-chain system (p < .033). The stepping-like leg actions primarily facilitated horizontal motion rhythm over vertical motion and unweighting over push in terms of ground interaction. These findings suggest that TSSD can serve as an effective method for developing a rhythmic and dynamic motion pattern while increasing CHS.
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Affiliation(s)
- Kanji Mori
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
| | - Taylor D North
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
| | - Kai-Jen Cheng
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
| | - Seungho Baek
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
| | - Hunter B Alvis
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
| | - Young-Hoo Kwon
- Biomechanics & Motor Behavior Laboratory, Texas Woman's University, Denton, TX, USA
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Levine NA, Baek S, Tuttle N, Alvis HB, Hung CJ, Sokoloski ML, Kim J, Hamner MS, Lee S, Rigby BR, Kwon YH. Biomechanical effects of fatigue on lower-body extremities during a maximum effort kettlebell swing protocol. Sports Biomech 2023:1-18. [PMID: 37126368 DOI: 10.1080/14763141.2023.2207556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Kettlebell training provides multiple health benefits, including the generation of power. The primary purpose of this study was to examine the kinematics and kinetics of lower-body joints during a repeated, maximum effort kettlebell swing protocol. Sixteen resistance and kettlebell swing experienced males performed 10 rounds of a kettlebell swing routine (where one round equates to 30s of swings followed by 30s of rest). Kinematic (i.e., swing duration and angular velocities) and kinetic (i.e., normalised sagittal plane ground reaction force, resultant joint moment [RJM] and power) variables were extracted for the early portion and late portion of the round. Average swing duration and the magnitude of normalised ground reaction forces (GRF) increased within rounds, while hip joint power decreased. Changes in swing duration were minimal, but consistent due to an increase in overall fatigue. An increase in the magnitude of GRF was observed at the end of rounds, which is a potential concern for injury. Hip joint power decreased primarily due to a slower angular velocity. This protocol may be an effective routine for those who are resistance trained with kettlebell swing experience, and who want to optimise power in their exercise program.
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Affiliation(s)
- Nicholas A Levine
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Seungho Baek
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Noelle Tuttle
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Hunter B Alvis
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Cheng-Ju Hung
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Matthew L Sokoloski
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Jemin Kim
- Biomechanics Laboratory, Kinesiology and Health Science, Louisiana State University Shreveport, Shreveport, LA, USA
| | - Mark S Hamner
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Sangwoo Lee
- Biomechanics Laboratory, Western Michigan University, Kalamazoo, MI, USA
| | - Brandon R Rigby
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Young-Hoo Kwon
- Biomechanics and Motor Behavior Laboratory, School of Health Promotion and Kinesiology, Texas Woman's University, Denton, TX, USA
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