Khaled Trabelsi

Khaled Trabelsi
High Institute of Sport and Physical Education of Sfax, Tunisia

PhD

About

150
Publications
83,696
Reads
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4,034
Citations
Citations since 2016
133 Research Items
3909 Citations
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Introduction
I'm currently working on: systematic reviews and meta-analyses, wellbeing during COVID-19 lockdowns, intermittent fasting, physical performance, diet, body composition, sleep, biological markers
Additional affiliations
December 2010 - January 2011
University of Sfax
Position
  • Professor (Assistant)

Publications

Publications (150)
Article
Full-text available
This study examined the effects of a six-week preparatory training program on physical performance and physiological adaptations in junior soccer players. Additionally, we investigated whether a relationship existed between external and internal loads. Youth soccer players (aged 16 years old) from a youth football academy participated in six weeks...
Article
Full-text available
Religious fasting is practiced by people of all faiths, including Christianity, Islam, Buddhism, Jainism, as well as Hinduism, Judaism, and Taoism. Individual/clinical, public, global, and planetary health has traditionally been studied as separate entities. Nevertheless, religious fasting, in conjunction with other religious health assets, can pro...
Article
Full-text available
Paralympic powerlifting (PP), formerly known as “International Paralympic Committee” (IPC) powerlifting, is the format of powerlifting adapted for athletes with disabilities, and it differs from the version for able-bodied athletes in that it consists of bench press only. According to the mandate of the IPC, PP athletes should be enabled to achieve...
Article
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Eating disorders (EDs) are addressed as one of the expanding mental health problems worldwide. While an ED is a clinical psychiatric diagnosis that can only be established after a psychiatric assessment, it is important to note that “at-risk” refers to people who will exhibit aberrant eating patterns but do not fully meet the requirements for an ED...
Article
Full-text available
Eating disorders (EDs) are addressed as one of the expanding mental health problems worldwide. While an ED is a clinical psychiatric diagnosis that can be only established after a psychiatric as-sessment, it is important to note that "at-risk" refers to people who will exhibit aberrant eating patterns but do not fully meet the requirements for an E...
Article
Full-text available
The still ongoing COVID-19 pandemic has dramatically impacted athletes, and, in particular, para-athletes and athletes with disabilities. However, there is no scholarly appraisal on this topic. Therefore, a critical scoping review of the literature was conducted. We were able to retrieve sixteen relevant studies. The sample size ranged from 4 to 18...
Article
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Ramadan intermittent fasting during the COVID-19 lockdown (RIFL) may present unique demands. We investigated training practices (i.e., training load and training times) of athletes, using pre-defined survey criteria/questions, during the ‘first’ COVID-19 lockdown, comparing RIFL to lockdown-alone (LD) in Muslim athletes. Specifically, a within-subj...
Article
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A growing body of evidence indicates that napping is common among older adults. However, a systematic review on the effect of napping on the elderly is lacking. The aim of this systematic review was to (i) determine how studies evaluated napping behavior in older adults (frequency, duration and timing); (ii) explore how napping impacts perceptual m...
Article
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The interruption of learning processes by breaks filled with diverse activities is common in everyday life. The purpose of this study was to investigate the effects of the time of day (TOD) of playing with or without music during recess on cognitive performance regeneration among students aged between 11 and 12. Twenty-seven volunteer children (age...
Article
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Objectives: This study aimed to investigate the effects of Ramadan diurnal intermittent fasting (RDIF) on cognitive performance, sleep quality, daytime sleepiness, and insomnia in physically active and sedentary elderly individuals. Methods: A total of 58 participants (62.93±3.99 yrs) were assigned to one of the following two groups: a sedentary gr...
Article
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Purpose: To investigate differences in athletes' knowledge, beliefs, and training practices during COVID-19 lockdowns with reference to sport classification and sex. This work extends an initial descriptive evaluation focusing on athlete classification. Methods: Athletes (12,526; 66% male; 142 countries) completed an online survey (May-July 2020...
Article
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Circadian rhythms are a series of endogenous autonomous oscillators that are generated by the molecular circadian clock which coordinates and synchronizes internal time with the external environment in a 24-h daily cycle (that can also be shorter or longer than 24 h). Besides daily rhythms, there exist as well other biological rhythms that have dif...
Preprint
Full-text available
Religious fasting is practiced by people of all faiths, including Christianity, Islam, Buddhism, Jainism, as well as Hinduism, Judaism, and Taoism. Individual/clinical, public, global, and planetary health has traditionally been studied as separate entities. Nevertheless, religious fasting, in conjunction with other religious health assets, can pro...
Article
As laterality of the lower limbs is regarded as a relevant influence on soccer performance, we assessed whether a bilateral training program for both the preferred leg (PL) and non-preferred leg (NPL) would improve soccer players’ lateral asymmetry, agility, and accuracy. Sixty right-foot-dominant young soccer players were randomly assigned to eith...
Article
Aims The primary goal of this meta-analysis was to examine the changes in various components of metabolic syndrome (MetS) in healthy adults who observed Ramadan fasting (RF) before Ramadan (T1) and at the end of RF (T2). A secondary goal was to assess the impact of RF on MetS severity in various ethnic and sex groups using the MetS z-score. Data s...
Article
Systematic reviews and meta-analyses examining the effects of Ramadan observance on athletes’ mood states are lacking. Thus, this systematic review and meta-analysis aimed to identify the impact of Ramadan observance on athletes’ mood states assessed using validated scales. Six electronic databases (PubMed, Web of Science, Scopus, Wiley, Taylor & F...
Article
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The purpose of the study was to measure changes in sleep quality and perceived stress 28 and their interrelationships in a sample of healthcare workers two years post the COVID-19 pan-29 demic. Using a cohort design, data were collected from frontline healthcare workers (FLHCW, n = 30 70) and non-frontline healthcare workers (NFLHCW, n = 74) in Apr...
Article
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The COVID-19 outbreak resulted in the shutdown of athletic training facilities. Although the effects of these restrictions on daily activity and sleep patterns have been widely analyzed, the employed tools often lacked accuracy, and were based on subjective measures. This study assessed the effects of home confinement on objective physical activity...
Article
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Although the effects of caffeine supplementation on combat sports performance have been extensively investigated, there is currently no consensus regarding its ergogenic benefits.This systematic review with meta-analysis aimed to summarize the studies investigating the effects of caffeine supplementation on different aspects of performance in comba...
Article
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The human microbiota is comprised of more than 10-100 trillion microbial taxa and symbiotic cells. Two major human sites that are host to microbial communities are the gut and the skin. Physical exercise has favorable effects on the structure of human microbiota and metabolite production in sedentary subjects. Recently, the concept of “athletic mic...
Article
Background: There has been increasing evidence and support for the use of digital technology in the cognitive health field. Despite the growing use of innovative digital technology to assess cognitive function, such technology remains scarce in Arabic countries, particularly in Tunisia. Objective: To investigate the effectiveness of a digitally...
Article
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Objective: Myocardial infarction is the irreversible cell death of cardiac muscle that takes place after the blood flow is cut off to a specific region of the heart muscle. The molecular angiogenesis process that may follow after the incidence, due to any activity or its intensity, is unknown. The purpose of this research was to examine some of th...
Article
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Objective: Disrupted sleep and training behaviors in athletes have been reported during the COVID-19 pandemic. We aimed at investigating the combined effects of Ramadan observance and COVID-19 related lockdown in Muslim athletes. Methods: From an international sample of athletes (n = 3,911), 1,681 Muslim athletes (from 44 countries; 25.1 ± 8.7 yea...
Article
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Objective: To investigate the effect of 1) lockdown duration and 2) training intensity on sleep quality and insomnia symptoms in elite athletes. Methods: 1,454 elite athletes (24.1 ± 6.7 years; 42% female; 41% individual sports) from 40 countries answered a retrospective, cross-sectional, web-based questionnaire relating to their behavioral habits...
Article
Full-text available
Objective In a convenience sample of athletes, we conducted a survey of COVID-19-mediated lockdown (termed ‘lockdown’ from this point forward) effects on: (i) circadian rhythms; (ii) sleep; (iii) eating; and (iv) training behaviors. Methods In total, 3911 athletes [mean age: 25.1 (range 18–61) years, 1764 female (45%), 2427 team-sport (63%) and 14...
Article
This study aimed to examine the impact of 40-min and 90-min naps on performance in the 5-m shuttle run test (5mSRT) and on various physiological and perceptual measures. Sixteen male athletes (20 ± 3 years, 173 ± 7 cm, 67 ± 7 kg) performed the 5mSRT after a 40-min nap (N40), after a 90-min nap (N90), and in a no-nap, control condition (N0). The 5mS...
Article
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Research within sport science disciplines seeks to enhance performance via the combination of factors that influences the team's periodization. The current study aimed to investigate the variations in training load (TL), and the consequential changes in fitness variables, based on the use of match difficulty prediction model (MDP), level of opposit...
Conference Paper
Objectif Les sportifs souffrent du manque de sommeil de façon chronique. L’objectif de cette revue systématique était d’évaluer l’efficacité des opportunités de sieste diurne sur les performances physiques et cognitives des sportifs. Méthodes Conformément aux recommandations pour les revues systématiques et les méta-analyses (PRISMA), les bases de...
Article
Full-text available
The aim of this research was to evaluate the effect of Ramadan observance on dietary intake and body composition in adult athletes. This was a systematic review and meta-analysis. Data sources used were PubMed, Web of Science, Scopus, and Taylor and Francis. Eligibility criteria for selecting studies were as follows: single-group, pre-/post-Ramadan...
Article
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1) Background: ESports is a new trend of sports, which has gained considerable popularity worldwide. There is a scarcity of evidence that focuses on the lifestyle of ESports players (eSP) particularly on symptoms of nomophobia, level of anxiety, sleep quality, food consumption and physical activity. (2) Objective: to determine the prevalence and re...
Article
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It is well-documented that changes in the rhythm of life during Ramadan affect sleep schedules (i.e., interruption of night sleep patterns) and are likely to have negative effects on physical and cognitive performances. The aim of the present study was to examine the effect of different naps opportunities’ durations during Ramadan on performance of...
Article
IntroductionNitric oxide (NO) is a vasodilator that plays an important role in blood pressure control. The purpose of the present study was to compare the effect of 8 weeks of resistance-interval and endurance-resistance trainings on plasma levels of adropin and NO in males with hypertension.Method Forty-five patients with hypertension were recruit...
Article
Full-text available
The COVID-19 pandemic has affected the lifestyles and training of elite athletes around the world. The detrimental effects of lockdown periods may vary among individuals, as well as among sports and sexes. This study investigated the changes in dietary habits, and the predictors of perceived stress during lockdown and a “bubble” training camp. This...
Article
Improving acquisition and retention of new motor skills is of great importance. This study investigated the effects of progressive task difficulty manipulation (TD), combined with varying knowledge of results frequencies (KR) on performance accuracy and consistency when learning novel fine motor coordination tasks, and examined relationships betwee...
Conference Paper
Introduction: Athletes often experience chronic sleep disturbance. Napping is widely recommended as a safe and non-invasive intervention to counteract the negative effects of partial sleep deprivation. The aim of this systematic review was to evaluate the effectiveness of diurnal napping opportunities on athletes physical and cognitive performance,...
Article
Full-text available
In general, behavioural intervention is a more effective form of treatment. By the way, several behavioural interventions were studied in the education field to support and prevent students’ behaviour among them choice making. An ABAB withdrawal design was used to examine the effects of class-wide choice making on the engagement and disruptive beha...
Article
Full-text available
Objectives: Explore training-related knowledge, beliefs and practices of athletes and the influence of COVID-19-related lockdowns. Methods: Athletes [n = 12,526 classified: world-class (13%), international (21%), national (36%), state (24%), and recreational (6%)] completed an online survey (50 d; 17th May to 5th July 2020) exploring their trainin...
Article
The purpose of this study was to examine the effect of a 40-min nap opportunity (N40) on performance during, markers of muscle damage and inflammation, and the perception of fatigue and recovery, in response to a 5-m shuttle run test (5msrt). Fifteen male amateur athletes performed the 5msrt under two conditions: N40 and no-nap condition (NN). Bloo...
Article
Full-text available
Although napping is commonly used as a strategy to improve numerous physical and cognitive performances, the efficacy of this strategy for improving postural balance has not yet been elucidated. Thus, the aim of this study was to conduct a comprehensive examination of the effect of a 60min nap opportunity (N60) on different components of postural c...
Article
Full-text available
Objective: (i) To evaluate the effectiveness of diurnal napping opportunities on athletes’ physical and cognitive performance and (ii) to outline how aspects of the study design (i.e., nap duration, exercise protocol, participants’ fitness level and previous sleep quantity) can influence the potential effects of napping through a systematic apprais...
Article
Full-text available
The purpose of this systematic review and meta‐analysis is to provide an accurate description of the effect of Ramadan observance on sleep duration, sleep quality, daily nap duration, and daytime sleepiness in athletes and physically active individuals. Five electronic databases (PubMed, Web of Science, Scopus, Wiley, and Taylor and Francis) were u...
Article
Full-text available
In soccer, accurate kicking skills are important determinants of successful performance. A successful kick must meet several criteria, including speed, accuracy, and timing. In fact, players who are able to kick the ball more accurately under various difficulties, such as time pressure, space constraints, the opponent’s pressure, and the distance b...
Article
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Objectives: The purpose of this research was to explore the physical parameters and the heart rate responses of elite minifootball players during an international match. Methods: Ten male elite players from two national teams (Tunisia vs. Switzerland) participated in this study (26.2 ± 1.9 years, 175 ± 7 cm, 79.2 ± 5.8 kg). Heart rate was recorded...
Chapter
This study aims to shape an insight towards researchers' involvement in research projects in the Arabian region, mainly through assessing the intrinsic and extrinsic motivations towards research and their association with research attitudes and preferences. A cross-sectional study was conducted in the Arab states amid the COVID19 pandemic. A questi...
Article
Full-text available
The aim of the present study is to evaluate the effect of Ramadan observance (RAM) on decision-making in Kung-Fu athletes. Fourteen male Kung-Fu athletes (mean age = 19 ± 3 years) completed two test sessions: before Ramadan (BR) and at the end of Ramadan (ER). In the afternoon of each session (between 16:00 h and 18:00 h), participants completed: E...
Article
Objectives The objectives of this study were to evaluate the duration and the quality of sleep, as well as daytime sleepiness, among different levels of Arab athletes (i.e., amateur, elite) and to compare sleep quality and duration and daytime sleepiness in athletes and sedentary individuals. Material and methods A total of 409 participants, chara...
Article
The aim of the present study was to evaluate the impact of Ramadan fasting on sleep quality and daytime sleepiness in team sport referees. Seventy-eight male amateur team sport referees (age: 31.1 ± 10.8 years) participated in this study. Participants responded to the Arabic version of the Pittsburgh Sleep Quality Index (PSQI) and the Epworth sleep...
Article
Full-text available
Physical training is considered as a low-cost intervention to generate cardioprotective benefits and to promote physical and mental health, while reducing the severity of acute respiratory in-fection symptoms in older adults. However, lockdown measures during COVID-19 have limited people’s opportunity to exercise regularly. The aim of this study wa...
Article
The effect of a 40-min nap opportunity was investigated during the day following a late evening simulated soccer match. Twelve male amateur soccer players (23 ± 3 years; 77.3 ± 5.3 kg; 1.76 ± 0.04 m) performed the Loughborough-intermittent-shuttle test at 21h00 and the following day they completed the sleepiness scale after either a nonap (N0) or 4...
Article
Full-text available
Previous studies with adult human participants revealed mixed effects regarding the relation between spatial ability and visual instructions. In this study, we investigated this question in primary young children, and particularly we explored how young children with varying levels of spatial abilities integrate information from both static and dyna...
Article
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BACKGROUND The impact of intermittent circadian fasting (ICF) on skin disorders is far to be plenty deciphered. However, the circadian rhythm seems to exert a modulation on dermatoses severity, drug‐response and drug‐related side effects. OBJECTIVES To evaluate ICF effect in the daily management of dermatoses. METHODS In this multicenter, prospec...
Article
Full-text available
Background Monitoring heart rate variability (HRV) as an indicator of daily variations in the functioning of the autonomic nervous system (ANS) may assist in individualizing endurance training to produce more pronounced physiological adaptations in performance. Aims To systematically perform a meta-analysis of the scientific literature to determin...
Article
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Background: The COVID-19 lockdown could engender disruption to lifestyle behaviors, thus impairing mental wellbeing in the general population. This study investigated whether sociodemographic variables, changes in physical activity, and sleep quality from pre- to during lockdown were predictors of change in mental wellbeing in quarantined older ad...
Article
Full-text available
Objectives: The aim of this study was to investigate the technical actions and heart rate response of amateur minifootball players during a competitive match. Methods: Ten male amateur minifootball players (age: 26.3 ± 4.2 years, height: 176 ± 7.4 cm and body mass: 78.9 ± 10 kg), from a First Division Tunisian team, participated in a match (2 × 25-...