document

Longitudinal changes in shoulder ROM and strength in association with ball-throwing speed in elite youth baseball pitchers

van Dis, F. (author), Hoozemans, M (author), van der Graaff, E (author), Veeger, H.E.J. (author)

The purpose of this prospective study was to examine the longitudinal changes in shoulder ER ROM and relative IR strength in elite youth baseball pitchers over one year and to determine their associations with changes in ball speed for throwing fastballs. One hundred and five Dutch elite youth baseball pitchers were measured three times over a...

conference paper 2016

document

The role of pelvis and thorax rotation velocity in baseball pitching

van der Graaff, E (author), Hoozemans, M (author), Nijhoff, M. (author), Davidson, M (author), Hoezen, M (author), Veeger, H.E.J. (author)

The objective of the present study was to examine the relative timing of pelvis and thorax rotations in achieving high throwing velocities in baseball pitching. During the preseason, a kinematic analysis was performed on eight pitchers. Peak angular velocities of the pelvis and thorax were determined and separation, defined as the time between...

conference paper 2016

document

Establishing the Role of Elbow Muscles by Evaluating Muscle Activation and Co-contraction Levels at Maximal External Rotation in Fastball Pitching

van Trigt, B. (author), Galjee, E.N. (author), Hoozemans, Marco J.M. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author)

Background: Baseball pitching is associated with a high prevalence of ulnar collateral ligament injuries, potentially due to the high external valgus load on the medial side of the elbow at the instant of maximal shoulder external rotation (MER). In-vitro studies show that external valgus torque is resisted by the ulnar collateral ligament but...

journal article 2021

document

Timing of peak pelvis and thorax rotation velocity in baseball pitching

van der Graaff, Erik (author), Hoozemans, Marco J.M. (author), Nijhoff, Martijn (author), Davidson, Michael (author), Hoezen, Merel (author), Veeger, H.E.J. (author)

The objective of the present study was to examine the magnitude and timing of peak pelvis and thorax rotations in achieving high throwing velocities in pitching fastballs. During the preseason (Test 1 or T1) and four months later (Test 2 or T2), kinematic analysis was performed on eight elite youth pitchers throwing fastballs. Peak rotation...

journal article 2018

document

Quantifying Within-Individual Elbow Load Variability in Youth Elite Baseball Pitchers and Its Role in Overuse Injuries

van Trigt, B. (author), Bouman, F.F. (author), Leenen, Antonius J. R. (author), Hoozemans, Marco J.M. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author)

Medial elbow overuse injuries are rising in baseball. The external valgus torque magnitude is a possible risk factor for medial elbow injuries. The magnitude on its own cannot explain why one pitcher sustains an injury and another does not. Therefore, the aim of this study is to describe the within-individual external valgus torque variability...

journal article 2022

document

Energy flow through the lower extremities in high school baseball pitching

de Swart, A.F.M.J. (author), van Trigt, B. (author), Wasserberger, Kyle (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author), Oliver, Gretchen D. (author)

It is generally accepted that most of the energy transferred to the ball during a baseball pitch is generated in the trunk and lower extremities. Therefore, purpose of this study was to assess the energy flow through the lower extremities during a baseball pitch. It was hypothesised that the (stabilising) leading leg mainly transfers energy...

journal article 2022

document

Influence of posture variation on shoulder muscle activity, heart rate, and perceived exertion in a repetitive manual task

Luger, Tessy (author), Mathiassen, Svend Erik (author), Bosch, Tim (author), Hoozemans, Marco (author), Douwes, Marjolein (author), Veeger, H.E.J. (author), de Looze, Michiel (author)

In repetitive work, more physical variation is believed to reduce the risk of eventually developing musculoskeletal disorders. We investigated the extent to which workstation designs leading to more variation in upper arm postures during a pick-and-place task influenced outcomes of relevance to musculoskeletal disorder risk, including muscle...

journal article 2017

document

Knee angle and Stride Length in Association with Ball Speed in Youth Baseball Pitchers

van Trigt, B. (author), Schallig, W. (author), van der Graaff, E. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author)

The purpose of this study was to determine whether stride length and knee angle of the leading leg at foot contact, at the instant of maximal external rotation of the shoulder, and at ball release are associated with ball speed in elite youth baseball pitchers. In this study, fifty-two elite youth baseball pitchers (mean age 15.2 SD (standard...

journal article 2018

document

Effects of a Disturbed Kinetic Chain in the Fastball Pitch on Elbow Kinetics and Ball Speed

Leenen, A.J.R. (author), van Trigt, B. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author)

The purpose of the present study was to investigate the effect of an experimentally imposed kinetic chain disturbance in baseball pitching on ball speed and elbow kinetics. The experimental design consisted of two (within-subject) conditions. In one condition there was no manipulation (control condition). The other condition involved a...

journal article 2020

document

Are UCL Injuries a Matter of Bad Luck?: The Role of Variability and Fatigue Quantified

van Trigt, B. (author), Leenen, A.J.R. (author), Hoozemans, Marco J.M. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author)

Upper extremity injuries are common in baseball. One of these is the ulnar collateral ligament (UCL) injury. In the field of sports injuries, most research focuses on average kinematics and kinetics between subjects, whereas focusing on within-subject variability appears to be more relevant for determining injury risk. We constructed a simple...

journal article 2020

document

Machine Learning to Improve Orientation Estimation in Sports Situations Challenging for Inertial Sensor Use

van Dijk, M.P. (author), Kok, M. (author), Berger, Monique A.M. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author)

In sports, inertial measurement units are often used to measure the orientation of human body segments. A Madgwick (MW) filter can be used to obtain accurate inertial measurement unit (IMU) orientation estimates. This filter combines two different orientation estimates by applying a correction of the (1) gyroscope-based estimate in the...

journal article 2021

document

Obtaining wheelchair kinematics with one sensor only? The trade-off between number of inertial sensors and accuracy for measuring wheelchair mobility performance in sports

van Dijk, M.P. (author), van der Slikke, R.M.A. (author), Rupf, Rob (author), Hoozemans, Marco J.M. (author), Berger, Monique A.M. (author), Veeger, H.E.J. (author)

In wheelchair sports, the use of Inertial Measurement Units (IMUs) has proven to be one of the most accessible ways for ambulatory measurement of wheelchair kinematics. A three-IMU configuration, with one IMU attached to the wheelchair frame and two IMUs on each wheel axle, has previously shown accurate results and is considered optimal for...

journal article 2022

document

Fastball pitching performance only slightly decreases after mobility impediment of the pelvis and trunk—Do (catch-up) compensation strategies come into play?

Leenen, A.J.R. (author), van Trigt, B. (author), Hoozemans, M. J.M. (author), Veeger, H.E.J. (author)

Background: Baseball pitching performance can be mechanically explained by the summation of speed principle and the principle of optimal coordination of partial momenta. Impeding optimal energy generation or transfer by or between the pelvis and trunk segments could provide valuable insight into possible compensation or catch-up mechanisms...

journal article 2022

document

Trunk motion influences mechanical power estimates during wheelchair propulsion

van Dijk, M.P. (author), Hoozemans, Marco J.M. (author), Berger, M.A.M. (author), Veeger, H.E.J. (author)

In wheelchair sports, there is an increasing need to monitor mechanical power in the field. When rolling resistance is known, inertial measurement units (IMUs) can be used to determine mechanical power. However, upper body (i.e., trunk) motion affects the mass distribution between the small front and large rear wheels, thus affecting rolling...

journal article 2024

document

Magnitude and variability of individual elbow load in repetitive baseball pitching

van Trigt, B. (author), van Hogerwou, Thomas (author), Leenen, A.J.R. (author), Hoozemans, Marco J.M. (author), van der Helm, F.C.T. (author), Veeger, H.E.J. (author)

In baseball pitchers the elbow is exposed to high and repetitive loads (i.e. external valgus torque), caused by pitching a high number of balls in a practice session or game. This can result in overuse injuries like the ulnar collateral ligament (UCL) injury. To understand injury mechanisms, the effect of repetitive pitching on the elbow load...

journal article 2023

document

Focus of attention instructions during baseball pitching training

van der Graaff, Erik (author), Hoozemans, Marco (author), Pasteuning, Maurice (author), Veeger, H.E.J. (author), Beek, Peter J. (author)

It has often been shown that performance and learning in movement tasks may be improved by focusing on the effect of the movement in the environment (external focus of attention) instead of the movement itself (internal focus of attention). Nevertheless, most coaching instructions and feedback information given in sports seem to favor an...

journal article 2017

document

Improving mobility performance in wheelchair basketball

Veeger, Thom T.J. (author), De Witte, Annemarie M.H. (author), Berger, Monique A.M. (author), van der Slikke, R.M.A. (author), Veeger, H.E.J. (author), Hoozemans, Marco J.M. (author)

Objectiev:<br/>This study aimed to investigate which characteristics of athlete, wheelchair and athlete-wheelchair interface are the best predictors of wheelchair basketball mobility performance.<br/><br/>Design:<br/>Sixty experienced wheelchair basketball players performed a wheelchair mobility performance test to assess their mobility...

journal article 2017

document

Effects of offense, defense, and ball possession on mobility performance in wheelchair basketball

De Witte, Annemarie M.H. (author), Berger, Monique A.M. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author), van der Woude, Lucas H.V. (author)

The aim of this study was to determine to what extent mobility performance is influenced by offensive or defensive situations and ball possession and to what extent these actions are different for the field positions. From video analysis, the relative duration of the various wheelchair movements during team offense/defense and individual ball...

journal article 2017

document

Prevalence of self-reported stroke in association with ethnic background within a multi-ethnic population in Paramaribo, Suriname: Results from the helisur study

Jarbandhan, Ameerani V. (author), Hoozemans, Marco J.M. (author), Buys, Roselien (author), Diemer, Frederieke S. (author), Baldew, Se Sergio M. (author), Aartman, Jet (author), Brewster, Lizzy M. (author), Van Montfrans, Gert A. (author), Oehlers, Glenn P. (author), Veeger, H.E.J. (author), Toelsie, Jerry (author), Vanhees, Luc (author)

Background: Suriname is a middle-income country with a multi-ethnic population. Urbanization and ethnicity may be associated with incidence of cerebrovascular disease, but so far this has not been documented for Suriname. The objective of this study was to examine the prevalence of stroke in the capital of Suriname, and its association with...

journal article 2016

document

Feasibility and validity of a single camera CNN driven musculoskeletal model for muscle force estimation during upper extremity strength exercises: Proof-of-concept

Noteboom, L. (author), Hoozemans, Marco J.M. (author), Veeger, H.E.J. (author), van der Helm, F.C.T. (author)

Muscle force analysis can be essential for injury risk estimation and performance enhancement in sports like strength training. However, current methods to record muscle forces including electromyography or marker-based measurements combined with a musculoskeletal model are time-consuming and restrict the athlete's natural movement due to...

journal article 2022