Context: Inadequate hip range of motion (ROM) and isometric strength (ISO) may interfere with energy flow through the kinetic chain and result in increased injury susceptibility.
Objective: To examine the relationship of hip ROM and ISO with energy flow through the trunk and pitching-arm segments during the windmill softball pitch in youth athletes. A subsequent purpose was to examine the relationship between energy flow and pitch speed.
Design: Descriptive laboratory study.
Setting: University research laboratory.
Patients Or Other Participants: A sample of 29 youth softball pitchers (age = 11.2 ± 1.3 years, height = 155.0 ± 10.4 cm, mass = 53.2 ± 12.6 kg).
Main Outcome Measure(s): Bilateral hip internal-rotation and external-rotation (ER) ROM and ISO were measured. Net energy outflow and peak rates of energy outflow from the distal ends of the trunk, humerus, and forearm were calculated for the acceleration phase of the windmill softball pitch, and pitch speed was measured.
Results: Regression analysis revealed an effect of drive-hip ER ISO on the net energy flow out of the distal ends of the trunk (P = .045) and humerus (P = .002). Specifically, increased drive-hip ER ISO was associated with increased net energy outflow from the trunk to the humerus and from the humerus to the forearm. No significant effects of hip ROM or other hip ISO measures were observed. Additionally, pitchers who achieved higher peak rates of distal outflow tended to achieve higher pitch speeds.
Conclusions: An association was present between drive-hip ER ISO and the net energy flow out of the distal ends of the trunk and humerus during the acceleration phase of the windmill softball pitch, emphasizing the importance of hip and lower body strength in executing the whole-body windmill pitch. Overall, energy-flow analysis is an interesting new way to analyze pitching mechanics and will aid in furthering our understanding of performance and injury risk in windmill softball pitching.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8010918 | PMC |
| http://dx.doi.org/10.4085/1062-6050-145-20 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Remaining useful life prediction of lithium-ion batteries using a novel particle flow filter framework with grey model.
Sci Rep
January 2025
CALCE University of Maryland, College Park, MD, 20742, USA.
Remaining useful life (RUL) prediction is a crucial aspect of the prognostics health management of lithium-ion batteries (LIBs). Owing to the influence of resampling technology, particle degradation is often observed in the particle filter-based RUL prediction of LIBs, resulting in a low prediction accuracy and large uncertainty. In this paper, a novel particle flow filter with the grey model method (GM-PFF) is proposed to forecast the RUL and state of health of batteries.
View Article and Find Full Text PDFAssessing the feasibility of a spiritual healing intervention for adults with moderate depression: A pilot randomized controlled trial.
Complement Ther Med
January 2025
National Research Center of Complementary and Alternative Medicine (NAFKAM), Faculty of Health Science, Institute of Community Medicine, UiT The Arctic University of Norway, Hansine Hansensveg 19, 9037 Tromsø, Norway.
Background: Many individuals with depression explore complementary and alternative medicine, including spiritual healing. This pilot randomized controlled trial (RCT) aimed to assess the feasibility of a study that integrated spiritual healing with standard care versus standard care alone for adults with moderate depression.
Method: In this pilot RCT with two parallel groups, 28 adult patients with depression were randomized to receive either spiritual healing alongside usual care (n=14) or usual care alone (n=14).
Mechanistic insight into the decomposition of sulfone compounds in supercritical water.
J Environ Manage
January 2025
State Key Laboratory of Multiphase Flow in Power Engineering (SKLMF), Xi'an Jiaotong University, NO.28 Xianning West Road, Xi'an, 710049, Shaanxi Province, China.
Supercritical water gasification (SCWG) is famous for the clean utilization of organic wastes without SO emission. Investigating the decomposition mechanism of sulfone compounds, the dominant organic sulfur compounds of organic wastes, in supercritical water (SCW) is conducive to the development of SCWG technology. Herein, the comparative decomposition mechanism of phenyl vinyl sulfone (PVS), diphenyl sulfone (DS), and benzo[b]thiophene 1,1-dioxide (BD) are explored via experiments and density functional theoretical (DFT) calculations.
View Article and Find Full Text PDFCharacteristics of transition to turbulence in a healthy thoracic aorta using large eddy simulation.
Sci Rep
January 2025
University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan, 680-749, Republic of Korea.
This study employed large eddy simulation (LES) with the wall-adapting local eddy-viscosity (WALE) model to investigate transitional flow characteristics in an idealized model of a healthy thoracic aorta. The OpenFOAM solver pimpleFoam was used to simulate blood flow as an incompressible Newtonian fluid, with the aortic walls treated as rigid boundaries. Simulations were conducted for 30 cardiac cycles and ensemble averaging was employed to ensure statistically reliable results.
View Article and Find Full Text PDFImproving MRI turbulence quantification by addressing the measurement errors caused by the derivatives of the turbulent velocity field - Sequence development and in-vitro validation.
Magn Reson Imaging
January 2025
Institute of Fluid Mechanics, University of Rostock, Rostock, Germany.
Purpose: To improve the current method for MRI turbulence quantification which is the intravoxel phase dispersion (IVPD) method. Turbulence is commonly characterized by the Reynolds stress tensor (RST) which describes the velocity covariance matrix. A major source for systematic errors in MRI is the sequence's sensitivity to the variance of the derivatives of velocity, such as the acceleration variance, which can lead to a substantial measurement bias.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!