Morten B Randers

Morten B Randers
University of Southern Denmark | SDU · Institute of Sports Science and Clinical Biomechanics

PhD

About

102
Publications
74,786
Reads
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4,094
Citations
Additional affiliations
January 2018 - present
University of Southern Denmark
Position
  • Professor (Associate)
March 2017 - December 2017
University of Southern Denmark
Position
  • PostDoc Position
August 2015 - February 2017
Aalborg BK
Position
  • Fitness coach

Publications

Publications (102)
Article
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We determined player-to-player distance, body-to-ball contact, and exercise intensity during three training modalities in various football populations. 213 participants were recruited, ranging from 9-year-old boys to young men and 11-year-old girls to middle-aged women. All groups were analysed with video-filming and GPS-based Polar Pro monitors du...
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Peak locomotor demands are considered as key metrics for conditioning drills prescription and training monitoring. However, research in female football have focused on absolute values when reporting match demands, leading to sparse information being provided regarding the degrees of variability of such metrics. Thus, the aims of this study were to...
Article
Session rating of perceived exertion (sRPE) is a subjective self-reported measure of training load and is a popular method in several different team sports. This study aimed to investigate the validity of sRPE, by correlating sRPE load (sRPE × minutes of training) and heart rate (HR) expressed as Edwards Summated Heart Rate Zones (SHRZ) and PlayerL...
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Women’s football is an intermittent sport characterized by frequent intense actions throughout the match. The high number of matches with limited recovery time played across a long competitive season underlines the importance of nutritional strategies to meet these large physical demands. In order to maximize sport performance and maintain good hea...
Article
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The purpose of the present study was to investigate the physical performance of elite female football players during match play along with transient alterations in running performance following 1‐ and 5‐min univariate peak periods. 54 elite female players from four top‐level Norwegian teams were monitored for one season (n = 393 match observations)...
Article
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Studies on females’ decisive physical components to physical match‐play performance are sparse and only emphasize endurance tests. Thus, the influence of maximal strength and power on physical performance during match‐play is currently unknown. The aim of this study was to assess the association between one repetition maximum (1RM) half squat stren...
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We combined game activity analyses with skeletal muscle phenotypes and comprehensive physiological testing to elucidate factors of importance for physical performance in elite women's football. GPS‐data from an experimental game, sprint and endurance testing, and muscle tissue analysis of metabolic enzyme activity, protein expression and fiber type...
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The present study examined skeletal muscle metabolism and changes in repeated sprint performance during match play for n = 20 competitive elite women outfield players. We obtained musculus vastus lateralis biopsies and blood samples before, after, and following intense periods in each half of a friendly match, along with 5 × 30‐meter sprint tests a...
Article
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The purpose of this study was to quantify the exercise intensity and technical involvement of U9 boys' and girls' team handball during different game formats, and the differences between genders. Locomotor activity (total distance, distance in speed zones, accelerations, and decelerations), heart rate (HR), and technical involvement (shots, goals,...
Article
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The present study investigated the position-specific match demands and heart rate response of female elite footballers, with special focus on the full-game, end-game, and peak-intensity periods. In total, 217 match observations were performed in 94 players from all eight teams of the best Danish Women's League, that is, goalkeepers (GK, n = 10), ce...
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Introduction: The COVID-19 outbreak with partial lockdown has inevitably led to an alteration in training routines for football players worldwide. Thus, coaches had to face with the novel challenge of minimizing the potential decline in fitness during this period of training disruption. Methods: In this observational pre-to posttest study involving...
Article
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During the COVID-19 pandemic, physical inactivity has increased, and a wide range of sporting activities locked down, with possible long-term implications for public health. Football is the most popular sport worldwide, and recreational football training leads to broad-spectrum health effects. Football is, however, deemed a contact sport with frequ...
Article
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Abstract: Elite football can make players' feel nervous, and personality characteristics, as well as experience, affect how well pressure is handled before important games. Studying the psychological characteristics of female football players can provide information on how well psychological pressure is handled and provide knowledge on how to suppo...
Article
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Background High load (HL: > 85% of one repetition maximum (1RM)) squats with maximal intended velocity contractions (MIVC) combined with football sessions can be considered a relevant and time-efficient practice for maintaining and improving high velocity movements in football. Flywheel (FW) resistance exercise (RE) have recently emerged with promi...
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The purpose of this study was to compare anthropometric and functional profiles of 13-to-17-year-old soccer players according to their competitive level. Height, body mass, percentage of body fat, countermovement jump height, change of direction ability, 5-and 15-m sprint times, repeated sprint ability (RSA), intermittent recovery performance, and...
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The aim of this editorial is to discuss the football evolution and prepare the players, the coaches, sports medicine and sports science staff for the future game demands. The game tactical evolution is expected to elevate the players' physical demands. This together with the congested schedule will impose additional physical and mental load to the...
Article
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The COVID-19 pandemic has changed the conditions for competitive football around the globe dramatically. Several competitions and leagues have been cancelled or postponed. Players have firstly been forced to training in solitude. In a second stage, players start training in small groups with strict contact restriction and return to competitive play...
Article
Purpose The present study investigated muscle metabolism and fatigue during simulated elite male ice hockey match-play. Methods Thirty U20 male national team players completed an experimental game comprising three periods of 8x1-min shifts separated by 2-min recovery intervals. Two vastus lateralis biopsies were obtained either during the game (...
Article
Purpose: The aim of this study was to evaluate the reproducibility of internal and external load parameters during recreational small-sided football games. Methods: Ten healthy untrained young adult males (age: 20.2±1.9 yr, body mass: 69.2±6.3 kg, height: 175.4±5.9 cm, body fat: 19.7±5.2%) performed two 2x20-min sessions of four versus four plus go...
Article
This study aimed to examine the health effects of fitness training and team-sport training in a pragmatic community health centre set-up for women with lifestyle diseases. The methods included training intensity evaluations and measurements of VO2max, blood pressure, body composition and exercise performance. In all, 40 women in the fitness trainin...
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Background: Changes of direction (COD) repeated sprints (RSs) might have greater relevance to football than linear RSs. We aimed to compare the effects of linear and COD RSs on intermittent high intensity running (HIR) over an entire season. Methods: In total, 19 high-level male football players (16-19 years) randomly performed linear RSs or COD...
Article
The aim of this study was to compare technical variables by playing positions in football during the 2015 Asian Cup. Top-level male football players (n = 202) that completed the full 90-min game were considered. Match-analysis data were collected using OPTA Sportsdata (www.optasports.com). Kruskal–Wallis H non-parametric test revealed that external...
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The aim of the study was to compare the activity pattern, heart rate (HR), technical involvement, and subjective perceptions in U13 boys and girls playing team handball in five game formats. Activity pattern, heart rate (HR), technical involvement, perceived fun, and exertion were recorded from four girls teams (n = 24) and four boys teams (n = 24)...
Article
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Aging is a physiological process characterized by a progressive decline of biological functions and an increase in destructive processes in cells and organs. Physical activity and exercise positively affects the expression of skeletal muscle markers involved in longevity pathways. Recently, a new mechanism, autophagy, was introduced to the adaptati...
Conference Paper
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PURPOSE: The purpose of this study was to investigate the influence of game format on exercise intensity, technical involvement and perception in U9 male and female team handball. METHODS: Locomotor activity, heart rate (HR) and technical involvement were collected during 15-min games of various formats from a total of 57 Danish U9 players (37 boys...
Article
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Recreational football has been shown to be an effective health-promoting activity, but it is still unclear how changes in game formats affect external and internal load. The aim of this study was therefore to evaluate the effect of area per player in recreational small-sided football games. Ten recreational active male football participants (mean±s...
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This study examines heart rate (HR) and perceived experience during same- versus mixed-gender soccer played as small- (SSG) and large-sided (LSG) games. HR, rating of perceived exertion (RPE), and fun scores were determined in 134 pupils (50 girls, 84 boys) randomly assigned to same- and mixed-genders formats playing 2x15-min of SSG (2v2, 4v4) and...
Article
We examined the influence of competitive standard of the opponent on activity profile and fatigue during preseason friendly soccer matches. Time motion analysis was performed in a male professional soccer team (N = 14) during six friendly games played against professional, semi-professional and amateur-level opponents (PL, SPL and AL). The referenc...
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This study compares the effects of team-sport training, for sedentary men with lifestyle diseases, with fitness training in a pragmatic set-up in a community health centre (CHC). Thirty-two men in the fitness group (FiG) and 36 men in the team-sport group (TsG) completed the training and trained for 60–90 min, two times/week for 12–16 weeks. In FiG...
Article
Street soccer has been shown to be effective in improving cardiovascular and musculoskeletal fitness in homeless men, due to high heart rate (HR) and multiple intense actions. The purpose of this study was to investigate HR, movement pattern, rating of perceived exertion (RPE), flow and worry during street soccer for homeless women. Fifteen homeles...
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Purpose The aims of this study were to (1) investigate the health-related physical fitness profile of untrained adolescent boys in comparison to adolescent soccer players, (2) determine the intensity and enjoyment of 6v6 and 4v4 small-sided games, and (3) evaluate the health-related effects of a short-period of soccer training in the untrained grou...
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The review describes the fitness and health effects of recreational football in women aged 18–65 years. The review documents that 2 × 1 h of recreational football training for 12–16 weeks causes marked improvements in maximal oxygen uptake (5–15%) and myocardial function in women. Moreover, mean arterial blood pressure was shown to decrease by 2–5...
Article
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The present study investigated whether street soccer might be proposed as an alternative to recreational small-sided games on grass as a health-enhancing activity, and specifically the effects of the boards surrounding the pitch. Eleven recreationally active young males (28.4±4.2 (±SD) yrs, 19.9±4.2% body fat, 47.7±6.0 mlminkg), after familiarizati...
Article
Recreational soccer is an effective health-promoting activity, but it is unclear how different game formats influence internal and external load. Thus, to be able to advise how to maximise the outcome of recreational football, we examined movement pattern and physiological response in 11 untrained men (32.6 ± 6.7 yrs, 23.3 ± 4.9 fat%, 43.4 ± 5.3 ml...
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Purpose The aim of the present study was to investigate whether street basketball organized as 3 v 3 on either a half court (HC) with 1 basket or a full court (FC) with 2 baskets could improve fitness and health profiles of untrained men after 3 months of supervised training. Methods Thirty-five untrained men (aged 20–42 years) completed the pre-...
Conference Paper
Full-text available
Background: Worldwide physical inactivity among adolescent leads to an increasing number of non-communicable lifestyle diseases such as cardiovascular, musculoskeletal and metabolic diseases (Fleming et al., 2014) and therefore it is important for adolescent to participate in physical activities. Recent evidence states that recreational football is...
Article
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PurposeWe investigated whether lifelong football training affects the expression of healthy longevity-related muscle molecular markers. Methods Biopsies were collected from the vastus lateralis muscle of 10 lifelong football-trained men (68.2 ± 3.0 years) and of 10 active untrained healthy men (66.7 ± 1.3 years). Gene and protein expression was mea...
Article
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Lack of motivation to exercise was reported as a major cause of sedentary behavior in adulthood. This descriptive study examines the acute physical and physiological demands of recreational team handball and evaluates whether it could be suggested as an exercise mode for fitness and health enhancement in 33–55-year-old untrained men. Time-motion, h...
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We investigated the exercise intensity and fitness effects of frequent school-based low-volume high-intensity training for 10 months in 8–10-year-old children. 239 Danish 3rd-grade school children from four schools were cluster-randomised into a control group (CON, n=116 ) or two training groups performing either 5×12 min/wk small-sided football pl...
Article
The study tested the hypothesis that long-term soccer training has positive impact on cardiovascular profile, body composition, bone health, and physical capacity in inactive, pre-menopausal women with mild hypertension. The study applied a randomized controlled design in which physically inactive middle-aged women were separated into a soccer trai...
Article
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The present study evaluated the effect of a lighter and smaller ball on the kicking velocity as well as technical, tactical and physical match performance for high-level women’s football players. Kicking speed with the new ball (NB) and standard ball (SB) were evaluated for twelve elite female players in a laboratory test setting and physical loadi...
Article
The present study evaluated the effect of a smaller, lighter ball on kicking speed and technical-tactical and physical match performance in high-level adult female footballers. In the laboratory test setting, the peak ball velocity was 6% higher with the new ball (NB) than the standard ball (SB) (26.5±0.5 vs. 25.1±0.5 m·s⁻¹, p<0.05). However, durin...
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Purpose: A decline in physical capacity takes place with increasing age that negatively affects overall physical function including work ability and the ability to perform typical activities of daily living (ADL). The overall aim of the present study was to determine the neuromuscular adaptations to long-term (1 year) football and strength trainin...
Article
The purpose of this study was to evaluate technical performance, heart rate (HR), and activity profile in 7v7 and 8v8 soccer games for 9[FIGURE DASH]10-year-old girls (U11). A total of 24 female youth players participated in the study, all playing 20-min 7v7 and 8v8 games with 160 and 223 m per player, respectively. Technical actions, HR, and activ...
Article
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Abstract Abstract The study examined the effect of caffeine supplementation on match activities and development of fatigue during a football match. In a randomised, double-blind cross-over design, two experimental football games separated by 7 days were organised between the junior teams of two professional football clubs (17.6 ± 1.1 years (±s), 7...
Article
The present study investigated the cardiac effects of a 10-week football training intervention for school children aged 9-10 years using comprehensive transthoracic echocardiography as a part of a larger ongoing study. A total of 97 pupils from four school classes were cluster-randomized into a control group that maintained their usual activities (...
Article
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This case-control study investigated the feasibility of street football as a health-enhancing activity for homeless men, specifically the musculoskeletal effects of 12 weeks of training. Twenty-two homeless men participated in the football group (FG) and 10 served as controls (C). Plasma osteocalcin, TRACP5b, leptin, and postural balance were measu...
Article
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We examined the effect of the number of players on the activity profile and physiological response to small-sided recreational football games with fixed relative pitch size. Twelve untrained men (age: 33.0 ± 6.4 (± standard deviation) years, fat%: 22.4 ± 6.1%, VO2 max: 43.3 ± 5.2 mL/min/kg) completed three football sessions of 4 times 12 min with 3...
Article
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The purpose of this study was to evaluate activity profile, aerobic load, and player involvement in two game formats of recreational and elite youth football for two age groups. A total of 152 youth players participated, with 45 U10 players playing 5v5 and 8v8 games, and 41 U13 players playing 8v8 and 11v11 (20 min) games. Activity profile, heart r...
Article
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The effects of 16 weeks of football or strength training on performance and functional ability were investigated in 26 (68.2 ± 3.2 years) untrained men randomized into a football (FG; n = 9), a strength training (ST; n = 9), or a control group (CO; n = 8). FG and ST trained 1.6 ± 0.1 and 1.5 ± 0.1 times per week, respectively, with higher (P < 0.05...
Article
We investigated the effects of 3 and 6 months of regular football training on cardiac structure and function in hypertensive men. Thirty-one untrained males with mild-to-moderate hypertension were randomized 2:1 to a football training group (n = 20) and a control group receiving traditional recommendations on healthy lifestyle (n = 11). Cardiac mea...