Article
Chemistry, Multidisciplinary
Gary Chi-Ching Chow, Yu-Hin Kong, Wai-Yan Pun
Summary: This study aimed to investigate the concurrent validity and test-retest reliability of three portable measurement systems for CMJ. Results showed significant differences among the three systems, with HomeCourt presenting the highest jump height mean value and TVJM demonstrating the best reliability. Average jump heights were recommended for analysis.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
George Plakoutsis, Dimitrios Zapantis, Eirini-Maria Panagiotopoulou, Eleftherios Paraskevopoulos, Maria Moutzouri, George A. Koumantakis, Maria Papandreou
Summary: Physical fitness is crucial for athletes, and the countermovement jump is a commonly used test for evaluating lower extremity capacities. This study aimed to evaluate the reliability and validity of a portable force platform (KForce Plates) for assessing the countermovement jump in collegiate athletes. The results indicated high test-retest reliability and strong correlation with a validated application, suggesting that the KForce Plates system is a reliable and valid tool for assessing the countermovement jump.
APPLIED SCIENCES-BASEL
(2023)
Article
Biophysics
Arran Parmar, Ashleigh Keenan, Gill Barry
Summary: The study found that the gFlight system provided higher measures of jump performance compared to the force plate, especially in assessing reactive strength during drop jumps. The use of corrective equations can help reduce measurement biases displayed by the gFlight system.
PHYSIOLOGICAL MEASUREMENT
(2021)
Article
Multidisciplinary Sciences
Joel M. Garrett, Cedric Leduc, Zeki Akyildiz, Daniel J. van den Hoek, Filipe Manuel Clemente, Mehmet Yildiz, Hadi Nobari
Summary: This study investigated the effects of three typical football training sessions on neuromuscular responses and examined the reliability of peak speed (PS) measured during a submaximal running test (SRT) in identifying neuromuscular fatigue (NMF) status. The results showed a significant decrease in all variables after the training sessions. The external load variables of each football session differed significantly. The study also demonstrated that PS can be a reliable measure for monitoring NMF status.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Jose M. M. Jimenez-Olmedo, Basilio Pueo, Jose M. M. Mossi, Lamberto Villalon-Gasch
Summary: The study aimed to assess the validity of the inertial measurement unit (IMU) Vmaxpro in estimating vertical jump height (VJH) compared to a motion capture system (MoCAP). Thirteen highly trained female volleyball players participated in three sessions. Results showed significant differences in jump height between Vmaxpro and MoCAP, with a very strong correlation between the two (r(s) = 0.84, p < 0.001). While Vmaxpro can be considered a valid alternative to MoCAP due to its affordability and portability, the presence of systematic error suggests caution when using interchangeable data without a specific fitting equation.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Biomedical
Amador Garcia-Ramos, Alejandro Perez-Castilla, Slobodan Jaric
Summary: This study compared the reliability and validity of force-velocity relationship parameters obtained from two-point methods with different distances between experimental points, and evaluated the acute change in unloaded jump height after vertical jump testing based on multiple loads. The study found that the most distant two-point method showed comparable reliability and high validity with respect to the multiple-point method, while reliability and validity of the two-point methods decreased with proximity of applied loads. Additionally, unloaded jump height significantly reduced after both testing procedures.
SPORTS BIOMECHANICS
(2021)
Article
Multidisciplinary Sciences
Mark G. E. White, Neil E. Bezodis, Jonathon Neville, Huw Summers, Paul Rees
Summary: This study developed a machine learning model based on characteristic features extracted from a single accelerometer, accurately measuring external peak power in athletes. The results demonstrate that functional data representations work well in machine learning.
Article
Sport Sciences
Haris Pojskic, Emmanuel Ver Papa, Sam Shi Xuan Wu, Jeffrey Cayaban Pagaduan
Summary: The purpose of this study was to establish the validity, reliability, and usefulness of a low-cost contact mat equipment (CM), and the results showed that it can be used as an alternative tool for assessing jump performance.
JOURNAL OF HUMAN SPORT AND EXERCISE
(2022)
Article
Biochemistry & Molecular Biology
Anne Gessner, Heidi Stoelzer-Hutsch, Katrin Trentzsch, Dirk Schriefer, Tjalf Ziemssen
Summary: In the early stages of multiple sclerosis (MS), there are currently no sensitive assessments to evaluate complex motor functions. The countermovement jump (CMJ) has been investigated as a reliable assessment for lower extremity motor function in healthy subjects. This study aimed to determine if CMJ could identify motor deficits in individuals with MS below the clinical threshold. The results showed that individuals with MS demonstrated significantly decreased CMJ performance compared to healthy controls, indicating that CMJ could detect motor deficits in MS patients.
Article
Multidisciplinary Sciences
Pawel Pakosz, Anna Lukanova-Jakubowska, Edyta Luszczki, Mariusz Gnoinski, Oscar Garcia-Garcia
Summary: The study aimed to identify the biomedical signals of short-track athletes through evaluating the effects of monthly strength training on changes in their neuromuscular profile, strength, and power parameters of the lower limb muscles. The research found that a monthly period of strength training can improve the neuromuscular profile of short-track female athletes, especially in aspects such as countermovement jump, flight time, and contraction time.
Article
Sport Sciences
Amilton Vieira, James J. Tufano
Summary: The study investigated the reliability of RSImod and associated variables in combat athletes and physically active men, finding that combat athletes had lower test-retest variation and slightly better scores. While combat athletes jumped higher than physically active men, there were no significant differences in RSImod or TTT between the two groups. RSImod was more strongly correlated with jump height than time to take-off, especially in athletes.
Article
Engineering, Biomedical
Amador Garcia-Ramos, Danica Janicijevic, Juande Cobo-Font, Daniel Marcos-Frutos, John F. T. Fernandes, Wolfgang Taube, Alejandro Perez-Castilla
Summary: This study found that providing jump height feedback can effectively enhance vertical jump performance, but it does not reduce the variability between jumps.
SPORTS BIOMECHANICS
(2023)
Article
Sport Sciences
Alejandro Perez-Castilla, Jonathon Weakley, Felipe Garcia-Pinillos, F. Javier Rojas, Amador Garcia-Ramos
Summary: This study investigated the effect of countermovement depth on CMJ performance and found that lower knee flexion angles were associated with higher RSImod values. Additionally, the RSImod was higher for CMJ(pref) compared to CMJ(refer), indicating the importance of consistent countermovement depths when comparing RSImod values.
EUROPEAN JOURNAL OF SPORT SCIENCE
(2021)
Article
Sport Sciences
Logan Wade, Laurie Needham, M. Polly McGuigan, James L. J. Bilzon
Summary: This study compared the accuracy and variability of different methods for calculating jump height and found that the backward double integration method and the forward double integration method produced equivalent mean jump heights, with the latter slightly higher. The Flight Time + Constant method had increased variability in jump height calculation and should not be used when alternate methods are available.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Multidisciplinary Sciences
Amane Zushi, Takuya Yoshida, Kodayu Zushi, Yasushi Kariyama, Mitsugi Ogata
Summary: This study aimed to determine the variables that affect the performance of the lower limb's stretch-shortening cycle (SSC) motor execution. The results showed that positive ankle power was the most influential factor for the performance variables. Additionally, different kinetic variables were required to achieve higher jump height and shorter contact time.
Letter
Engineering, Biomedical
Thomas Dos'Santos, Jason Lake, Paul Comfort
SPORTS BIOMECHANICS
(2022)
Article
Sport Sciences
Paul Comfort, Paul A. Jones, Christopher Thomas, Thomas Dos'Santos, John J. McMahon, Timothy J. Suchomel
Summary: This study found that high-load resistance training led to superior increases in early multi-joint force production compared to moderate-load training, suggesting the importance of adjusting training load to optimize specific muscle force production outcomes.
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2022)
Review
Engineering, Biomedical
Marcos A. Soriano, Kristof Kipp, Jason P. Lake, Timothy J. Suchomel, Pedro J. Marin, Maria P. Sainz De Baranda, Paul Comfort
Summary: The assessment of mechanical power production is crucial for researchers and practitioners. This article compares different methods (GRF, kinematic, and combined) used to assess power production in weightlifting exercises. The methods have inherent differences in data analysis and measurement systems, suggesting that they cannot be used interchangeably. The use of GRF is recommended for assessing power production applied to the system mass, while the kinematic method is more suitable for assessing power applied to the barbell.
SPORTS BIOMECHANICS
(2023)
Article
Multidisciplinary Sciences
John McMahon, Jason Lake, Paul Comfort
Summary: The aim of this study was to identify position-specific force-time variables in countermovement jump (CMJ) for rugby league players. The results showed no significant differences between global forwards and backs in the countermovement and propulsion phase variables, but backs had higher jump height and forwards had greater take-off momentum. There were considerable individual variations in body mass and CMJ outcome variables across positions.
Article
Hospitality, Leisure, Sport & Tourism
Marcos A. Soriano, Ester Jimenez-Ormeno, G. Gregory Haff, Paul Comfort, Veronica Giraldez-Costas, Carlos Ruiz-Moreno, Amador Garcia-Ramos
Summary: This study aimed to evaluate the use of lifting velocity for estimating the 1RM in overhead press and compare the accuracy of three velocity-based methods. The results suggest that the Multiple-Point and Two-Point(45-90) velocity-based methods may be viable tools for predicting the overhead press 1RM in weightlifters, but practitioners are encouraged to use the direct 1RM for a more accurate prescription of the training loads.
INTERNATIONAL JOURNAL OF SPORTS SCIENCE & COACHING
(2023)
Article
Chemistry, Analytical
John J. McMahon, Nicholas J. Ripley, Paul Comfort
Summary: The purpose of this study is to provide normative data and objective benchmarks for countermovement jump (CMJ) in professional rugby league (RL) forwards and backs, and to facilitate data interpretation and benchmark setting using standardized T-scores and a traffic light system.
Article
Sport Sciences
Paul Comfort, G. Gregory Haff, Timothy J. Suchomel, Marcos A. Soriano, Kyle C. Pierce, W. Guy Hornsby, Erin E. Haff, Lesley M. Sommerfield, Shyam Chavda, Stephanie J. Morris, Andrew C. Fry, Michael H. Stone
Summary: This position statement summarizes the impact of weightlifting training on sports performance. Weightlifting training can enhance athletes' strength, speed, and power, especially for non-weightlifters. Incorporating weightlifting exercises into strength and conditioning programs, along with proper technique and skill development, leads to greater improvements in force-production characteristics and athletic performance compared to general resistance training or plyometric training alone.
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2023)
Article
Multidisciplinary Sciences
Nicholas J. Ripley, Matthew Cuthbert, Paul Comfort, John McMahon
Summary: The study aimed to observe the effects of adding the Nordic hamstring exercise (NHE) or sprinting to a lower-limb training program on modifiable risk factors for hamstring strain injury (HSI) and athletic performance. The results showed that both additional NHE and sprinting significantly improved muscle architecture and athletic performance, suggesting that incorporating multiple modalities as part of a complete resistance training program has similar benefits for reducing HSI risk and enhancing athletic performance.
Article
Chemistry, Analytical
Andrew J. Badby, Peter D. Mundy, Paul Comfort, Jason P. Lake, John J. McMahon
Summary: Force plate testing is becoming more popular in sports due to the availability of commercially available, portable, and affordable force plate systems. This study aimed to determine the concurrent validity of the HD wireless dual force plate hardware for assessing vertical jumps. The results showed that the HD system can be considered a valid alternative to the industry gold standard for assessing vertical jumps.
Article
Sport Sciences
Timothy J. Suchomel, Baylee S. Techmanski, Cameron R. Kissick, Paul Comfort
Summary: This study compared the reliability and bias of three velocity measurement devices during jump shrug and hang high pull exercises. The Tendo Power Analyzer demonstrated better reliability and validity compared to the GymAware Powertool and Push Band 2.0, which showed poor-moderate reliability and unacceptable variability.
JOURNAL OF FUNCTIONAL MORPHOLOGY AND KINESIOLOGY
(2023)
Article
Multidisciplinary Sciences
Francisco Javier Robles-Palazon, Paul Comfort, Nicholas J. Ripley, Lee Herrington, Christopher Bramah, John J. Mcmahon
Summary: This article presents a protocol and a methodological framework to perform a scoping review of the scientific literature pertaining to clinical applications of force plate technology in the injury profiling and rehabilitation of athletes. The specific aims of the review are to identify and describe force plate tests, methodologies, and metrics used in screening for injury risk and guiding the return of injured athletes, to identify potential differences by participants' characteristics, and to identify gaps in the existing evidence and new research questions. The global aim is to improve practitioner decision-making in the field of injury prevention and rehabilitation.
Editorial Material
Medicine, General & Internal
Peter Ladlow, C. Suffield, J. P. Greeves, P. Comfort, J. Hughes, R. P. Cassidy, A. N. Bennett, R. J. Coppack
BMJ MILITARY HEALTH
(2023)
Review
Sport Sciences
Adam Grainger, Paul Comfort, Craig Twist, Shane M. Heffernan, Giampiero Tarantino
Summary: The study found that professional rugby union matches and training can lead to fatigue in players, with increased subjective feelings and muscle soreness, as well as decreased muscle strength, but the results are not statistically significant, indicating the unclear effectiveness of assessing fatigue in professional rugby union players.
Article
Sport Sciences
Shyam Chavda, Jason P. Lake, Paul Comfort, Chris Bishop, Shaun A. Joffe, Anthony N. Turner
Summary: This study aims to explore the relationship between vertical jump and weightlifting performance, and to identify some temporal strategy metrics that have not been assessed before. The results of the study show that propulsive impulse in vertical jump is strongly related to weightlifting performance in both women and men.
JOURNAL OF SCIENCE IN SPORT AND EXERCISE
(2023)
Review
Physiology
Lachlan P. James, Jonathon Weakley, Paul Comfort, Minh Huynh
Summary: This study systematically analyzed the effects of resistance training on maximal dynamic and isometric strength and found that isometric and dynamic strength represent separate neuromuscular domains with limited proportionality between them. These findings have implications for strength-assessment models in athlete populations.
INTERNATIONAL JOURNAL OF SPORTS PHYSIOLOGY AND PERFORMANCE
(2023)
