Stephan Van der Zwaard

Stephan Van der Zwaard
Vrije Universiteit Amsterdam | VU · Faculty of Human Movement Sciences

PhD

About

33
Publications
17,411
Reads
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301
Citations
Citations since 2017
25 Research Items
296 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
Additional affiliations
October 2018 - present
Leiden University
Position
  • Analyst
November 2017 - October 2018
City of Amsterdam, The Hague and Rotterdam
Position
  • Analyst
October 2013 - October 2017
Vrije Universiteit Amsterdam
Position
  • PhD Student

Publications

Publications (33)
Article
Full-text available
The aim of this study was to determine if quadriceps morphology [muscle volume (MV); cross-sectional area (CSA)], vastus lateralis (VL) muscle architecture, and muscle quality [echo intensity (ECHO)] can explain differences in knee extensor maximal voluntary isometric contraction (MVIC), crank torque (CT) and time‒to‒exhaustion (TTE) in trained cyc...
Article
Full-text available
Athlete development depends on many factors that need to be balanced by the coach. The amount of data collected grows with the development of sensor technology. To make data-informed decisions for training prescription of their athletes, coaches could be supported by feedback through a coach dashboard. The aim of this paper is to describe the desig...
Article
Full-text available
In this study, we investigated the relationships between training load, perceived wellness and match performance in professional volleyball by applying the machine learning techniques XGBoost, random forest regression and subgroup discovery. Physical load data were obtained by manually logging all physical activities and using wearable sensors. Dai...
Article
van der Zwaard, S, Hooft Graafland, F, van Middelkoop, C, and Lintmeijer, LL. Validity and reliability of facial rating of perceived exertion scales for training load monitoring. J Strength Cond Res XX(X): 000-000, 2022-Rating of perceived exertion (RPE) is often used by coaches and athletes to indicate exercise intensity, which facilitates trainin...
Article
Full-text available
The aim of this observational study was to examine the differences between training variables as intended by coaches and perceived by junior speed skaters and to explore how these relate to changes in stress and recovery. During a 4-week preparatory period, intended and perceived training intensity (RPE) and duration (min) were monitored for 2 coac...
Article
Full-text available
Training-induced adaptations in muscle morphology, including their magnitude and individual variation, remain relatively unknown in elite athletes. We reported changes in rowing performance and muscle morphology during the general and competitive preparation phases in elite rowers. Nineteen female rowers completed 8 weeks of general preparation, in...
Article
Full-text available
In the past decades, researchers have extensively studied (elite) athletes' physiological responses to understand how to maximize their endurance performance. In endurance sports, whole-body measurements such as the maximal oxygen consumption, lactate threshold, and efficiency/economy play a key role in performance. Although these determinants are...
Article
Full-text available
We implemented a machine learning approach to investigate individual indicators of training load and wellness that may predict the emergence or development of overuse injuries in professional volleyball. In this retrospective study, we collected data of 14 elite volleyball players (mean ± SD age: 27 ± 3 years, weight: 90.5 ± 6.3 kg, height: 1.97 ±...
Conference Paper
Full-text available
With the recent explosive developments in sensoring capabilities and ubiquitous computing in road cycling, large quantities of detailed data about performance are becoming available. In this paper, we will demonstrate that this rich data in cycling offers several non-trivial data science challenges. The primary task that we focus on is a regression...
Chapter
With the recent explosive developments in sensoring capabilities and ubiquitous computing in road cycling, large quantities of detailed data about performance are becoming available. In this paper, we will demonstrate that this rich data in cycling offers several non-trivial data science challenges. The primary task that we focus on is a regression...
Article
Worldwide scientific output is growing faster and faster. Academics should not only publish much and fast, but also publish research with impact. The aim of this study is to use machine learning to investigate characteristics of articles that were published in the Journal of Applied Physiology between 2009 and 2018, and characterize high-impact art...
Article
Fascicle length of m. vastus lateralis in cyclists has been shown to correlate positively with peak sprint cycling power normalized for lean body mass. We investigated whether vasti morphology affects sprint cycling power via force-length and force-velocity relationships. We simulated isokinetic sprint cycling at pedaling rates ranging from 40 to 1...
Article
Full-text available
Do athletes specialize toward sports disciplines that are well aligned with their anthropometry? Novel machine-learning algorithms now enable scientists to cluster athletes based on their individual anthropometry while integrating multiple anthropometric dimensions, which may provide new perspectives on anthropometry-dependent sports specialization...
Article
Full-text available
A comparison with the mitochondrial oxidative capacity. TO THE EDITOR: With great interest we read Green and Askew’s Viewpoint (1) on validity of VO2peak, mode-specific VO2max, and VO2max. Exercise testing is generally performed to identify upper limits in cardiorespiratory fitness. However, VO2peak measurements could lead to inaccurate estimation...
Article
Full-text available
Veel sporten, zoals wielrennen, roeien en schaatsen, vragen van de sporter zowel explosiviteit als een goed uithoudingsvermogen. Het optimaliseren van beide eigenschappen blijkt echter lastig. Hoe kun je als topsporter toch goede sprint- en duurvermogen combineren om te komen tot die uitzonderlijke prestatie? Om dit te begrijpen, hebben we de bep...
Article
Full-text available
Optimizing physical performance is a major goal in current physiology. However, basic understanding of combining high sprint and endurance performance is currently lacking. This study identifies critical determinants of combined sprint and endurance performance using multiple regression analyses of physiologic determinants at different biologic lev...
Thesis
Full-text available
To understand what makes an athlete a champion, we aimed to unravel the physiological determinants of physical performance and to implement these insights into training strategies to improve physical performance. Whereas physical performance is commonly distinguished in endurance or sprint performance, most sports require a combination of sprint...
Article
Full-text available
Rowers need to combine high sprint and endurance capacities. Muscle morphology largely explains muscle power generating capacity, however, little is known on how muscle morphology relates to rowing performance measures. The aim was to determine how muscle morphology of the vastus lateralis relates to rowing ergometer performance, sprint and enduran...
Article
Full-text available
The developmental goal of 3D ultrasound imaging (3DUS) is to engineer a modality to perform 3D morphological ultrasound analysis of human muscles. 3DUS images are constructed from calibrated freehand 2D B-mode ultrasound images, which are positioned into a voxel array. Ultrasound (US) imaging allows quantification of muscle size, fascicle length, a...
Poster
Full-text available
BACKGROUND: Rowing races challenge rowers to combine high sprint and endurance capacity. Muscle morphology is an important determinant of sprint and endurance capacities and as such may also be a critical determinant of rowing performance. PURPOSE: To determine how much of the rowing performance of Olympic rowers is explained by sprint and enduranc...
Article
Full-text available
to the editor: We thank Gifford and colleagues for their comment ([3][1]) and agree that the correlation between mitochondrial oxidative capacity and V̇o2 max among our chronic heart failure (CHF) patients is not significant [ r = 0.47, P = 0.11 ([5][2])]. However, we disagree with their conclusion
Article
Full-text available
Near-infrared spectroscopy (NIRS) measurements of oxygenation reflect O2 delivery and utilization in exercising muscle and may improve detection of a critical exercise threshold.First, to detect an oxygenation breakpoint (Δ[O2HbMb-HHbMb]-BP) and compare this breakpoint to ventilatory thresholds during a maximal incremental test across sexes and tra...
Article
Full-text available
VO2max during whole-body exercise is presumably constrained by oxygen delivery to mitochondria rather than by mitochondria's ability to consume oxygen. Humans and animals have been reported to exploit only 60-80% of their mitochondrial oxidative capacity at VO2max However, ex vivo quantification of mitochondrial overcapacity is complicated by isola...
Conference Paper
Full-text available
Background: Maximal oxygen uptake (VO2max) is presumably constrained by oxygen delivery rather than mitochondria’s ability to consume oxygen. It has been suggested that animals exploit only 60-80% of their in vitro oxidative capacity when they exercise at VO2max. In humans, however, the quantification of mitochondrial overcapacity remains unclear....
Article
Full-text available
Sporters als schaatsers, wielrenners en roeiers moeten beschikken over een goed uithoudingsvermogen, maar moeten ook kunnen sprinten. Hoe train je zowel het sprint- als het duurvermogen zonder dat dit ten koste gaat van elkaar? Ons onderzoek richt zich op de vraag of en hoe elite wielrenners, schaatsers en roeiers tegelijkertijd hun sprint- en duur...
Article
Full-text available
Exercise-based rehabilitation is a standard therapy for patients with heart disease. Despite examples of patients who have extended normal rehabilitation exercise into competitive participation, there are no clear-cut guidelines for patients whether they should participate in competitive-level exercise. This study investigated the occurrence of com...
Conference Paper
Background: Pacing has focused on behavior in competitive athletes. However, the concept of pacing is also relevant for other populations, as pacing seems to be organized in terms of task completion. Purpose: This study describes of the pacing pattern in active, non-athlete, older adults compared to the pattern reported in the literature on pacing...

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Projects

Project (1)
Project
In most sports, athletes are required to combine high sprint and endurance performance. However, this is challenging, as muscle fiber VO2max and muscle fiber cross-sectional area are inversely related. In this project we investigate how to optimize sprint and endurance performance using insights from muscle (fiber) physiology and muscle morphology obtained with 3D ultrasound and muscle biopsies.