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Jribi W, Bougrine H, Aloui A, Khalfoun J, Souissi N, Mkacher W, El Abed K, Ben Abderrahman A. Morning-evening differences of short-term maximal performance and psychological variables in female athletes. Front Physiol 2024; 15:1402147. [PMID: 38872835 PMCID: PMC11170028 DOI: 10.3389/fphys.2024.1402147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Accepted: 05/09/2024] [Indexed: 06/15/2024] Open
Abstract
The aim of this study was to examine the effect of time of day on short-term maximal performance and psychological variables in young females. Fifteen active women participated in the study (age: 22 ± 3 years) and completed Hooper and the POMS-F questionnaires subsequently. In a randomized order, they performed a maximum of 30 s cycling exercise at two different times of day: in the morning at 07:00 h and in the afternoon at 16:00 h with a recovery period of 48 h. The digit cancellation test, countermovement jump (CMJ), squat jump (SJ) test, and the lower quarter Y balance test were performed at the beginning and at the end of each session. Our results showed that only peak power and mean power (p < 0.01) during the maximum 30 s cycling, reaching distances during the Y-balance (p < 0.05), Jump height in CMJ and SJ (p < 0.01) as well as attention, vigor, and stress scores (all p < 0.01) were higher in the afternoon than in the morning. Our results indicated a daily diurnal variation in short-term maximal performance and mood states in young athletic women with better performance observed during the afternoon.
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Affiliation(s)
- Wafa Jribi
- High Institute of Sport and Physical Education Sfax, Sfax University, Sfax, Tunisia
- Education, High Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia
| | - Houda Bougrine
- High Institute of Sport and Physical Education Gafsa, Gafsa University, Sfax, Tunisia
- Physical Activity Research Unit, Sport, and Health (UR18JS01), National Observatory of Sports, Tunis, Tunisia
| | - Ali Aloui
- High Institute of Sport and Physical Education, Manouba University, Manouba, Tunisia
- Tunisian Research Laboratory “Sports Performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
| | - Jihen Khalfoun
- High Institute of Sport and Physical Education, Manouba University, Manouba, Tunisia
| | - Nafaa Souissi
- High Institute of Sport and Physical Education Sfax, Sfax University, Sfax, Tunisia
- Education, High Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia
| | - Wajdi Mkacher
- High Institute of Sport and Physical Education Sfax, Sfax University, Sfax, Tunisia
- Department of Physiology and Lung Function Testing, Faculty of Medicine Ibn-El-Jazzar, University of Sousse, Sousse, Tunisia
| | - Kais El Abed
- High Institute of Sport and Physical Education Sfax, Sfax University, Sfax, Tunisia
- Education, High Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia
| | - Abderraouf Ben Abderrahman
- High Institute of Sport and Physical Education, Manouba University, Manouba, Tunisia
- Tunisian Research Laboratory “Sports Performance Optimization”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
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Robertson CM, Pullinger SA, Robinson WR, Smith ME, Burniston JG, Edwards BJ. Circadian variation in muscle force output in males using isokinetic, isometric dynamometry: can we observe this in multi-joint movements using the muscleLab force-velocity encoder and are they similar in peak and magnitude? Chronobiol Int 2024; 41:709-724. [PMID: 38722075 DOI: 10.1080/07420528.2024.2348011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 04/19/2024] [Indexed: 05/22/2024]
Abstract
We have investigated the magnitude of circadian variation in Isokinetic and Isometric strength of the knee extensors and flexors, as well as back squat and bench press performance using the MuscleLab force velocity transducer. Ten resistance-trained males (mean±SD: age 21.5 ± 1.1 years; body mass 78.3 ± 5.2 kg; height 1.71 ± 0.07 m) underwent a) three to four familiarization sessions on each dynamometer and b) four sessions at different times of day (03:00, 09:00, 15:00 and 21:00 h). Each session was administered in a counterbalanced order and included a period when Perceived onset of mood states (POMS), then rectal and muscle temperature (Trec, Tm) was measured at rest, after which a 5-min standardized 150 W warm-up was performed on a cycle ergometer. Once completed, Isokinetic (60 and 240°·s-1 for extension and flexion) and Isometric dynamometry with peak torque (PT), time-to-peak-torque (tPT) and peak force (PF) and % activation was measured. Lastly, Trec and Tm were measured before the bench press (at 30, 50 and 70 kg) and back squat (at 40, 60 and 80 kg) exercises. A linear encoder was attached to an Olympic bar used for the exercises and average force (AF), peak velocity (PV) and time-to-peak-velocity (tPV) were measured (MuscleLab software; MuscleLab Technology, Langesund, Norway) during the concentric phase of the movements. Five-min recovery was allowed between each set with three repetitions being completed. General linear models with repeated measures and cosinor analysis were used to analyse the data. Values for Trec and Tm at rest were higher in the evening compared to morning values (Acrophase Φ: 16:35 and 17:03 h, Amplitude A: 0.30 and 0.23°C, Mesor M: 36.64 and 37.43°C, p < 0.05). Vigor, happy and fatigue mood states responses showed Φ 16:11 and 16:03 h and 02:05 h respectively. Circadian rhythms were apparent for all variables irrespective of equipment used where AF, PF and PT values peaked between 16:18 and 18:34 h; PV, tPV and tPT peaked between 05:54 and 08:03 h (p < 0.05). In summary, circadian rhythms in force output (force, torque, power, and velocity) were shown for isokinetic, isometric dynamometers and complex multi-joint movements (using a linear encoder); where tPV and tPT occur in the morning compared to the evening. Circadian rhythms in strength can be detected using a portable, low-cost instrument that shows similar cosinor characteristics as established dynamometers. Hence, muscle-strength can be measured in a manner that is more directly transferable to the world of athletic and sports performance.
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Affiliation(s)
- Colin M Robertson
- Sport, School of Health, Social Work and Sport, University of Central Lancashire, Preston, UK
| | - Samuel A Pullinger
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
- Sport Science Department, Inspire Institute of Sport, Bellary, India
| | - William R Robinson
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Matt E Smith
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Jatin G Burniston
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Ben J Edwards
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
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Ghattassi K, Farjallah MA, Graja A, Romdhani M, Boudhina N, Guimard A, Driss T, Souissi N, Chtourou H, Hammouda O. Nocturnal Melatonin Ingestion Improves Soccer Players' Short-Term Maximal Performances on the Following Day. RESEARCH QUARTERLY FOR EXERCISE AND SPORT 2024:1-8. [PMID: 38329497 DOI: 10.1080/02701367.2024.2303457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 01/04/2024] [Indexed: 02/09/2024]
Abstract
Purpose: Exogenous melatonin has been proven to have beneficial effects on sleep. A good sleep quality promotes recovery and improves physical performance. In this sense, the present study aimed to explore the potential effect of nocturnal melatonin ingestion on psycho-cognitive and short-term maximal performances, in the following morning. Method: Twelve professional soccer players (22.9 ± 1.3 years, 1.80 ± 0.05 m, and 72.0 ± 8.8 kg) volunteered to perform two separate testing sessions after either nocturnal melatonin or placebo ingestion. The next morning, participants performed the following psycho-cognitive and physical tests: Hooper's index, reaction time, vigilance, handgrip strength (HG), squat jump (SJ), modified agility T-test (MAT) and Wingate anaerobic test (WanT). Rating of perceived exertion (RPE) and blood lactate [La] were recorded, respectively, immediately and 3 min after the WanT. Blood glucose [GL] was measured before and 3 min after WanT. Results: Compared with placebo, melatonin improved subjective sleep quality, short-term maximal performances (HG and SJ), reaction-time, as well as peak and mean WanT powers and decreased fatigue index and RPE scores. However, [La] and [GL] were not affected by melatonin ingestion. Conclusion: Nocturnal melatonin intake before sleep has beneficial effects on cognitive and physical performances the following day.
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Affiliation(s)
| | | | | | | | | | - Alexandre Guimard
- Université Sorbonne Paris Nord
- Université d'Orléans CIAMS
- Université Paris-Saclay CIAMS
- SAPRéM, Université d'Orléans
| | | | | | | | - Omar Hammouda
- Faculty of Medicine, University of Sfax
- Paris Nanterre University
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Magnuson JR, Kang HJ, Debenham MIB, McNeil CJ, Dalton BH. Effects of sleep deprivation on perceived and performance fatigability in females: An exploratory study. Eur J Sport Sci 2023; 23:1922-1931. [PMID: 35989687 DOI: 10.1080/17461391.2022.2115944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Sleep deprivation (SD) is prevalent and impairs motor function; however, little is known about its effect on perceived and performance fatigability, especially in females. To examine the effects of 24 h of SD on these attributes of fatigue, nine females completed a 20-min isometric, sustained elbow flexion contraction, followed by 10 min of recovery. The superimposed twitch (SIT) elicited via transcranial magnetic stimulation (TMS) assessed supraspinal drive. Biceps brachii electromyographic data indicated neural excitability in response to stimulation over the motor cortex (motor evoked potential; MEP), corticospinal tract (cervicomedullary motor evoked potential; CMEP), and brachial plexus (maximal M-wave; Mmax). MEPs and CMEPs were recorded during a TMS-induced silent period. At baseline, ratings of perceived effort (RPE; 2.9 vs. 1.6) and fatigue (RPF; 6.9 vs. 2.9), were higher for SD than control. Across the 20-min contraction, RPE increased from 2.2 to 7.6, SIT and MEP/CMEP increased by 284 and 474%, respectively, whereas maximal voluntary isometric contraction (MVC) torque and CMEP/Mmax decreased by 26 and 57%, respectively. No differences were found across conditions for MVC, SIT, Mmax, CMEP/Mmax, or MEP/CMEP prior to, during, and after the fatiguing task. During recovery, RPE (4.9 vs. 3.4), RPF (7.6 vs. 2.8), and perception of task difficulty (5.5 vs. 4.5) were greater for SD than control. Acute SD does not appear to alter performance fatigability development and subsequent recovery; however, it increases perceptions of fatigue, effort, and task difficulty. Thus, the disconnect between perceived and actual neuromuscular capacity following a sustained, submaximal isometric task is exacerbated by SD.HighlightsSleep deprivation did not alter supraspinal drive or neural excitability during and after a 20-min submaximal elbow flexion contractionSleep deprivation increased perceived fatigue and perception of task difficultyThe disconnect between perceived and performance fatigability is exacerbated in a sleep-deprived state.
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Affiliation(s)
- Justine R Magnuson
- School of Health and Exercise Sciences and Centre for Heart, Lung and Vascular Health, The University of British Columbia, Kelowna, Canada
| | - Hogun J Kang
- School of Health and Exercise Sciences and Centre for Heart, Lung and Vascular Health, The University of British Columbia, Kelowna, Canada
| | - Mathew I B Debenham
- School of Health and Exercise Sciences and Centre for Heart, Lung and Vascular Health, The University of British Columbia, Kelowna, Canada
| | - Chris J McNeil
- School of Health and Exercise Sciences and Centre for Heart, Lung and Vascular Health, The University of British Columbia, Kelowna, Canada
| | - Brian H Dalton
- School of Health and Exercise Sciences and Centre for Heart, Lung and Vascular Health, The University of British Columbia, Kelowna, Canada
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Bommasamudram T, Ravindrakumar A, Varamenti E, Tod D, Edwards BJ, Peter IG, Pullinger SA. Daily variation in time-trial sporting performance: A systematic review. Chronobiol Int 2022; 39:1167-1182. [PMID: 35815685 DOI: 10.1080/07420528.2022.2090373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Few functional measures related to time-trial display diurnal variation. The diversity of tests/protocols used to assess time-trial performance on diurnal effects and the lack of a standardised approach hinder agreement in the literature. Therefore, the aims of the present study were to investigate and systematically review the evidence relating to time-of-day differences in time-trial measures and to examine the main aspects related to research design important for studies of a chronobiological nature. The entire content of Manipal Academy of Higher Education electronic library and Qatar National Library, and electronic databases: PubMed (MEDLINE), Scopus and Web of Science were searched. Research studies published in peer-reviewed journals and non-peer reviewed studies, conducted in male adult participants aged ≥18 y before November 2021 were screened/included. Studies assessing tests related to time-trials in any modality between a minimum of 2 time-points during the day (morning [06:30-10:30 h] vs evening [14:30-20:00 h]) were deemed eligible. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) process was used to assess the evidence to inform recommendations. The primary search revealed that a total of 10 from 40 articles were considered eligible and subsequently included. Six were conducted using cycling, two using running and two using swimming as the mode of exercise. Distances ranged from 1 to 16.1-km in distance or 15 to 20-min time in the cycling and running time-trials, and 50 to 200-m in the swimming time-trials. Only four studies found one or several of their performance variables to display daily variations, with significantly better values in the evening; while six studies found no time-of-day significance in any variables assessed. The magnitude of difference ranged from 2.9% to 7.1% for performance time to complete a cycling time-trial, while running and swimming did not find any differences for performance time. Power output during a 16.1-km time trial in cycling also found evening performance to be significantly better by 10%. The only other observed differences were stroke rate and stroke length during a swimming time-trial and stroke rate (cycles.min-1) during a cycling time-trial. The magnitude of difference is dependent on exercise modality, individual chronotype, the training status of the individual and sample size differences. The lack of diurnal variation present in the majority of studies can in-part be explained with some of the methodological limitations and issues present related to quality and control. It is paramount that research assessing diurnal variation in performance uses appropriate session timings around the core body temperature minimum (~05:00 h; morning) and maximum (~17:00 h; evening). Although, differences in motivation/arousal, habitual training times, chronotypes and genotypes could provide an explanation as to why some studies/variables did not display time-of-day variation, more work is needed to provide an accurate conclusion. There is a clear demand for a rigorous, standardised approach to be adopted by future investigations which control factors that specifically relate to investigations of time-of-day, such as appropriate familiarisation, counterbalancing the order of administration of tests, providing sufficient recovery time between sessions and testing within a controlled environment.
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Affiliation(s)
- Tulasiram Bommasamudram
- Department of Exercise and Sports Science, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, India
| | - Aishwarya Ravindrakumar
- Department of Exercise and Sports Science, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, India
| | | | - David Tod
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Ben J Edwards
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Irene G Peter
- Department of Exercise and Sports Science, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, India
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Langeard A, Zouabi A, Martin T, Quarck G, Gauthier A. Circadian rhythm of postural control, sleepiness and verticality perception in older adults. Age Ageing 2022; 51:6548377. [PMID: 35298587 DOI: 10.1093/ageing/afac061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Indexed: 11/14/2022] Open
Abstract
INTRODUCTION with ageing, the risk of falling increases. It has been reported that fall frequency may depend on the time of the day, suggesting a possible circadian rhythm of postural control. The objective was to test whether postural control in older adults followed a circadian rhythm. Then, in order to examine the possible functions involved in circadian variations in balance performances, circadian rhythm of sleepiness and vertical perception were also tested. METHODS eight participants (70.7 ± 4.7 years) were included. Baseline circadian rhythm profile was assessed through continuous core temperature measurement. Static and dynamic balance, subjective sleepiness and fatigue, and verticality perception were measured at 2:00, 6:00, 10:00, 14:00, 18:00 and 22:00, on separate weeks in a random order. RESULTS temperature followed a circadian rhythm, with lowest temperature occurring at 03:50. Circadian rhythm was detected for the centre of pressure displacement length and velocity, in dynamic condition eyes closed, with lowest performances occurring at 18:33 and 16:59, respectively. Subjective sleepiness and fatigue also followed circadian rhythm with lowest sleepiness occurring at 15:46 and 15:50, for the Karolinska Sleeping Scale and the Visual Analogic Scale of fatigue, respectively. Finally, the vertical perception was not significantly following a circadian rhythm. CONCLUSION older adults present a circadian rhythm of balance, in particular in more challenging conditions, and the lowest performances occurred in the late afternoon These circadian rhythms could explain some of the falls happening at this time in community-dwelling older adults.
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Affiliation(s)
| | - Amira Zouabi
- Normandie Univ, UNICAEN, INSERM, COMETE, Caen 14000, France
| | - Tristan Martin
- Normandie Univ, UNICAEN, INSERM, COMETE, Caen 14000, France
| | - GaËlle Quarck
- Normandie Univ, UNICAEN, INSERM, COMETE, Caen 14000, France
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Ravindrakumar A, Bommasamudram T, Tod D, Edwards BJ, Chtourou H, Pullinger SA. Daily variation in performance measures related to anaerobic power and capacity: A systematic review. Chronobiol Int 2022; 39:421-455. [PMID: 34978950 DOI: 10.1080/07420528.2021.1994585] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Numerous functional measures related to anaerobic performance display daily variation. The diversity of tests and protocols used to assess anaerobic performance related to diurnal effects and the lack of a standardized approach have hindered agreement in the literature. Therefore, the aim of the present study was to investigate and systematically review the evidence relating to time-of-day differences in anaerobic performance measures. The entire content of PubMed (MEDLINE), Scopus, SPORTDiscus® (via EBSCOhost) and Web of Science and multiple electronic libraries were searched. Only experimental research studies conducted in male adult participants aged ≥ 18 yrs before May 2021 were included. Studies assessing tests related to anaerobic capacity or anaerobic power between a minimum of two time-points during the day (morning vs evening) were deemed eligible. The primary search revealed that a total of 55 out of 145 articles were considered eligible and subsequently included. Thirty-nine studies assessed anaerobic power and twenty-five anaerobic capacity using different modes of exercise and test protocols. Forty-eight studies found several of their performance variables to display time-of-day effects, with higher values in the evening than the morning, while seven studies did not find any time-of-day significance in any variables which were assessed. The magnitude of difference is dependent on the modality and the exercise protocol used. Performance measures for anaerobic power found jump tests displayed 2.7 to 12.3% differences, force velocity tests ~8% differences, sprint tests 2.7 to 11.3% differences and 5-m multiple shuttle run tests 3.7 to 13.1% differences in favour of the evening. Performance measures for anaerobic capacity found Wingate test to display 1.8 to 11.7% differences and repeated sprint tests to display 3.4 to 10.2% differences. The only test not to display time-of-day differences was the running based anaerobic sprint test (RAST). Time-of-day variations in anaerobic performance has previously been partially explained by higher core-body and/or muscle temperature and better muscle contractile properties in the afternoon, although recent findings suggest that differences in methodology, motivation/arousal, habitual training times and chronotypes could provide additional explanations. There is a clear demand for a rigorous, standardised approach to be adopted by future investigations which control factors that specifically relate to investigations of time-of-day.
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Affiliation(s)
- Aishwarya Ravindrakumar
- Department of Exercise and Sports Science, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Tulasiram Bommasamudram
- Department of Exercise and Sports Science, Manipal College of Health Professions, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - David Tod
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Ben J Edwards
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Hamdi Chtourou
- Activité Physique, Sport et Santé, UR18JS01, Observatoire National du Sport, Tunis, Tunisia.,Institut Supérieur Du Sport Et De l'Education Physique De Sfax, Université De Sfax, Sfax Tunisie
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Essid S, Cherif M, Chtourou H, Souissi N. Time-of-day effects in physical performances and psychological responses in young elite male handball players. BIOL RHYTHM RES 2021. [DOI: 10.1080/09291016.2021.1922212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Sana Essid
- Research Unit, Physical Activity, Sport and Health (UR18JS01), National Observatory of Sports, Tunis, Tunisia
| | - Moncef Cherif
- Research Unit, Physical Activity, Sport and Health (UR18JS01), National Observatory of Sports, Tunis, Tunisia
- High Institute of Sport and Physical Education, Ksar-Saïd, Manouba University, Manouba, Tunisia
| | - Hamdi Chtourou
- Research Unit, Physical Activity, Sport and Health (UR18JS01), National Observatory of Sports, Tunis, Tunisia
- High Institute of Sport and Physical Education of Sfax, University of Sfax, Sfax, Tunisia
| | - Nizar Souissi
- Research Unit, Physical Activity, Sport and Health (UR18JS01), National Observatory of Sports, Tunis, Tunisia
- High Institute of Sport and Physical Education, Ksar-Saïd, Manouba University, Manouba, Tunisia
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Bessot N, Polyte R, Quesney M, Bulla J, Gauthier A. Diurnal gait fluctuations in single- and dual- task conditions. Chronobiol Int 2020; 37:836-844. [PMID: 32664758 DOI: 10.1080/07420528.2020.1773493] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Gait is one of the most basic movements, and walking activity accomplished in dual task conditions realistically represents daily life mobility. Much is known about diurnal variations of gait components such as muscle power, postural control, and attention. However, paradoxically only little is known about gait itself. The aim of this study was to analyze whether gait parameters show time-of-day fluctuation in simple and dual task conditions. Sixteen young subjects performed sessions at five specific hours (06:00, 10:00, 14:00, 18:00 and 22:00 h), performing a single (walking or counting) and a dual (walking and counting) task. When performing gait in dual task conditions, an additional cognitive task had to be carried out. More precisely, the participants had to count backwards from a two-digit random number by increments of three while walking. Spatio-temporal gait parameters and counting performance data were recorded for analysis. Walking speed significantly decreased, while stride length variability increased when the task condition switched from single to dual. In the single-task condition, diurnal variations were observed in both walking speed and counting speed. Walking speed was higher in the afternoon and in the evening (14:00 and 22:00 h) and lower in the morning (10:00 h). Counting speed was maximum at 10:00 and 14:00 h and minimum at 18:00 h. Nevertheless, no significant diurnal fluctuation was substanytiated in the dual task condition. These results confirm the existing literature about changes in gait between single and dual task conditions. A diurnal pattern of single-task gait could also be highlighted. Moreover, this study suggests that diurnal variations faded in complex dual task gait, when the cognitive load nearly reached its maximum. These findings might be used to reduce the risk for falls, especially of the elderly.
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Affiliation(s)
- N Bessot
- UNICAEN, INSERM, COMETE, GIP CYCERON, Normandie University , Caen, France
| | - R Polyte
- UNICAEN, INSERM, COMETE, GIP CYCERON, Normandie University , Caen, France
| | - M Quesney
- UNICAEN, INSERM, COMETE, GIP CYCERON, Normandie University , Caen, France
| | - J Bulla
- Department of Mathematics, University of Bergen , Bergen, Norway.,Department of Psychiatry and Psychotherapy, University Regensburg , Regensburg
| | - A Gauthier
- UNICAEN, INSERM, COMETE, GIP CYCERON, Normandie University , Caen, France
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Pullinger SA, Cocking S, Robertson CM, Tod D, Doran DA, Burniston JG, Varamenti E, Edwards BJ. Time-of-day variation on performance measures in repeated-sprint tests: a systematic review. Chronobiol Int 2019; 37:451-468. [DOI: 10.1080/07420528.2019.1703732] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Samuel A. Pullinger
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
- Sports Science Department, Aspire Academy,
Doha, Qatar
| | - Scott Cocking
- Sports Science Department, Aspire Academy,
Doha, Qatar
| | - Colin M. Robertson
- School for Sport and Biological Sciences, University of Bolton, Bolton, UK
| | - David Tod
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Dominic A. Doran
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Jatin G. Burniston
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | | | - Ben J Edwards
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
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11
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Cheikh M, Makhlouf K, Ghattassi K, Graja A, Ferchichi S, Kallel C, Houda M, Souissi N, Hammouda O. Melatonin ingestion after exhaustive late-evening exercise attenuate muscle damage, oxidative stress, and inflammation during intense short term effort in the following day in teenage athletes. Chronobiol Int 2019; 37:236-247. [DOI: 10.1080/07420528.2019.1692348] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Mohamed Cheikh
- High institute of sport and physical education Ksar-Said, Manouba university, Manouba, Tunisia
- High institute of sport and physical education, Sfax university, Sfax, Tunisia
| | - Khouloud Makhlouf
- High institute of sport and physical education, Sfax university, Sfax, Tunisia
| | - Kais Ghattassi
- High institute of sport and physical education, Sfax university, Sfax, Tunisia
| | - Ahmed Graja
- High institute of sport and physical education, Sfax university, Sfax, Tunisia
| | | | - Choumous Kallel
- Hematology Laboratory, Hospital Habib Bourguiba, Sfax, Tunisia
| | - Mallek Houda
- Hematology Laboratory, Hospital Slim Hadhri, Kerkennah, Sfax, Tunisia
| | - Nizar Souissi
- High institute of sport and physical education Ksar-Said, Manouba university, Manouba, Tunisia
- Research Unit Physical Activity, Sport and Health, UR18JS01, National Observatory of Sport, Tunis, Tunisia
| | - Omar Hammouda
- Interdisciplinary Laboratory in Neurosciences, Physiology and Psychology: Physical Activity and Health (LINP2-AAPS), UPL, University Paris Nanterre, UFR STAPS, Nanterre, France
- Research Unit, Molecular Bases of Human Pathology, Faculty of Medicine, Sfax University, Sfax, Tunisia
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Chtourou H, Engel FA, Fakhfakh H, Fakhfakh H, Hammouda O, Ammar A, Trabelsi K, Souissi N, Sperlich B. Diurnal Variation of Short-Term Repetitive Maximal Performance and Psychological Variables in Elite Judo Athletes. Front Physiol 2018; 9:1499. [PMID: 30416454 PMCID: PMC6212582 DOI: 10.3389/fphys.2018.01499] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 10/04/2018] [Indexed: 11/13/2022] Open
Abstract
Objectives: The aim of this study was to examine the effect of time of day on short-term repetitive maximal performance and psychological variables in elite judo athletes. Methods: Fourteen Tunisian elite male judokas (age: 21 ± 1 years, height:172 ± 7 cm, body-mass: 70.0 ± 8.1 kg) performed a repeated shuttle sprint and jump ability (RSSJA) test (6 m × 2 m × 12.5 m every 25-s incorporating one countermovement jump (CMJ) between sprints) in the morning (7:00 a.m.) and afternoon (5:00 p.m.). Psychological variables (Profile of mood states (POMS-f) and Hooper questionnaires) were assessed before and ratings of perceived exertion (RPE) immediately after the RSSJA. Results: Sprint times (p > 0.05) of the six repetition, fatigue index of sprints (p > 0.05) as well as mean (p > 0.05) jump height and fatigue index (p > 0.05) of CMJ did not differ between morning and afternoon. No differences were observed between the two times-of-day for anxiety, anger, confusion, depression, fatigue, interpersonal relationship, sleep, and muscle soreness (p > 0.05). Jump height in CMJ 3 and 4 (p < 0.05) and RPE (p < 0.05) and vigor (p < 0.01) scores were higher in the afternoon compared to the morning. Stress was higher in the morning compared to the afternoon (p < 0.01). Conclusion: In contrast to previous research, repeated sprint running performance and mood states of the tested elite athletes showed no-strong dependency of time-of-day of testing. A possible explanation can be the habituation of the judo athletes to work out early in the morning.
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Affiliation(s)
- Hamdi Chtourou
- UR15JS01: Education, Motricité, Sport et Santé (EM2S), Higher Institute of Sport and Physical Education, University of Sfax, Sfax, Tunisia
| | - Florian Azad Engel
- Institute of Sport and Sport Science, Heidelberg University, Heidelberg, Germany
| | - Hassen Fakhfakh
- UR15JS01: Education, Motricité, Sport et Santé (EM2S), Higher Institute of Sport and Physical Education, University of Sfax, Sfax, Tunisia
| | - Hazem Fakhfakh
- UR15JS01: Education, Motricité, Sport et Santé (EM2S), Higher Institute of Sport and Physical Education, University of Sfax, Sfax, Tunisia
| | - Omar Hammouda
- Centre de Recherches sur le Sport et le Mouvement (CeRSM EA 2931), Université Paris Nanterre, Nanterre, France
| | - Achraf Ammar
- UR15JS01: Education, Motricité, Sport et Santé (EM2S), Higher Institute of Sport and Physical Education, University of Sfax, Sfax, Tunisia
| | - Khaled Trabelsi
- UR15JS01: Education, Motricité, Sport et Santé (EM2S), Higher Institute of Sport and Physical Education, University of Sfax, Sfax, Tunisia
| | | | - Billy Sperlich
- Integrative and Experimental Training Science, Institute for Sport Sciences, University of Würzburg, Würzburg, Germany
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Inadequate sleep and muscle strength: Implications for resistance training. J Sci Med Sport 2018; 21:959-968. [DOI: 10.1016/j.jsams.2018.01.012] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/14/2018] [Accepted: 01/23/2018] [Indexed: 01/24/2023]
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Robertson CM, Pullinger SA, Robinson WR, Smith ME, Burniston JG, Waterhouse JM, Edwards BJ. Is the diurnal variation in muscle force output detected/detectable when multi-joint movements are analysed using the musclelab force-velocity encoder? Chronobiol Int 2018; 35:1391-1401. [PMID: 29944449 DOI: 10.1080/07420528.2018.1485685] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We have investigated the magnitude of diurnal variation in back squat and bench press performance using the MuscleLab force velocity transducer. Thirty resistance-trained males (mean ± SD: age 21.7 ± 1.4 years; body mass 80.5 ± 4.5 kg; height 1.79 ± 0.06 m) underwent two sessions at different times of day: morning (M, 07:30 h) and evening (E, 17:30 h). Each session included a period when rectal temperature (Trec) was measured at rest, a 5-min standardized 150 W warm-up on a cycle ergometer, then defined programme of bench press (at 20, 40 and 60 kg) and back squat (at 30, 50 and 70 kg) exercises. A linear encoder was attached to an Olympic bar used for the exercises and average force (AF), peak velocity (PV) and time-to-peak velocity (tPV) were measured (MuscleLab software; MuscleLab Technology, Langesund, Norway) during the concentric phase of the movements. Values for Trec at rest were higher in the evening compared to morning values (0.48°C, P < 0.0005). Daily variations were apparent for both bench press and back squat performance for AF (1.9 and 2.5%), PV (8.3 and 12.7%) and tPV (-16.6 and -9.8%; where a negative number indicates a decrease in the variable from morning to evening). There was a main effect for load where AF and tPV increased and PV decreased from the lightest load to the heaviest for both bench press and back squat (47.1 and 80.2%; 31.7 and 57.7%; -42.1 and -73.9%; P < 0.0005 where a negative number indicates a decrease in the variable with increasing load). An interaction was found only for tPV, such that the tPV occurs earlier in the evening than the morning at the highest loads (60 and 70 kg) for both bench press and back squat, respectively (mean difference of 0.32 and 0.62 s). In summary, diurnal variation in back squat and bench press was shown; and the tPV in complex multi-joint movements occurs earlier during the concentric phase of exercise when back squat or bench press is performed in the evening compared to the morning. This difference can be detected using a low cost, portable and widely available commercial instrument and enables translation of past laboratory/tightly controlled experimental research in to main-stream coaching practice.
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Affiliation(s)
- Colin M Robertson
- a School for Sport and Biological Sciences , University of Bolton , Bolton , UK
| | - Samuel A Pullinger
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK.,c Sports Science Department , Aspire Academy , Doha , Qatar
| | - William R Robinson
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK
| | - Mathew E Smith
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK
| | - Jatin G Burniston
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK
| | - James M Waterhouse
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK
| | - Ben J Edwards
- b Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK
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Martin T, Gauthier A, Ying Z, Benguigui N, Moussay S, Bulla J, Davenne D, Bessot N. Effect of sleep deprivation on diurnal variation of vertical perception and postural control. J Appl Physiol (1985) 2018. [PMID: 29543136 DOI: 10.1152/japplphysiol.00595.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of the study was to test the effect of total sleep deprivation on performance and time-of-day pattern of subjective visual vertical (SVV) and postural control. Nineteen healthy, young participants (4 women and 15 men 21.9 ± 1.2 yr) were engaged in two counterbalanced experimental sessions with or without total sleep deprivation. Oral temperature, Karolinska Sleepiness Scale, and visual analogic scale for fatigue, postural control, and SVV were randomly measured every 4 h, from 0600 to 2200. A linear mixed model was used to capture the effect of time of day and sleep condition as factors. A classical adjusted COSINOR function was then used to modelize this daily variation. After the control night of sleep, SVV as well as oral temperature, sleepiness, and fatigue showed significant time-of-day variation, contrasting with measures of postural control which remained stable across the day. After sleep deprivation, SVV showed no diurnal variation, but its mean deviation value increased by 29%. Postural control capability also decreased after sleep deprivation, with a higher center of pressure surface (+70.4%) and total length (+7.37%) but remained stable throughout the day. These results further confirm the negative effect of sleep loss on postural control capability. Even if a direct relationship cannot be confirmed, the disruption of SVV capacity after sleep deprivation could strongly play a role in postural control capacity changes. Sleep deprivation should be considered as a potent factor involved in balance loss and subsequent fall. NEW & NOTEWORTHY The topic of sleep deprivation and postural control is not understood, with discrepancy among results. This study described that postural control displays a stable level throughout the day and that sleep deprivation, even if it increases postural sway, does not affect this stable diurnal pattern. The modification of the perception of the vertical level after sleep deprivation could strongly play a role in the observed changes in postural control capacity.
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Affiliation(s)
- T Martin
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
| | - A Gauthier
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
| | - Z Ying
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
| | - N Benguigui
- Université de Caen Basse-Normandie, EA4260 CESAMS, Caen, France
| | - S Moussay
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
| | - J Bulla
- Department of Mathematics, University of Bergen , Bergen , Norway
| | - D Davenne
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
| | - N Bessot
- Normandie University, UNICAEN, INSERM, COMETE, Caen , France
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Martin T, Moussay S, Bulla I, Bulla J, Toupet M, Etard O, Denise P, Davenne D, Coquerel A, Quarck G. Exploration of Circadian Rhythms in Patients with Bilateral Vestibular Loss. PLoS One 2016; 11:e0155067. [PMID: 27341473 PMCID: PMC4920359 DOI: 10.1371/journal.pone.0155067] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 04/24/2016] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND New insights have expanded the influence of the vestibular system to the regulation of circadian rhythmicity. Indeed, hypergravity or bilateral vestibular loss (BVL) in rodents causes a disruption in their daily rhythmicity for several days. The vestibular system thus influences hypothalamic regulation of circadian rhythms on Earth, which raises the question of whether daily rhythms might be altered due to vestibular pathology in humans. The aim of this study was to evaluate human circadian rhythmicity in people presenting a total bilateral vestibular loss (BVL) in comparison with control participants. METHODOLOGY AND PRINCIPAL FINDINGS Nine patients presenting a total idiopathic BVL and 8 healthy participants were compared. Their rest-activity cycle was recorded by actigraphy at home over 2 weeks. The daily rhythm of temperature was continuously recorded using a telemetric device and salivary cortisol was recorded every 3 hours from 6:00AM to 9:00PM over 24 hours. BVL patients displayed a similar rest activity cycle during the day to control participants but had higher nocturnal actigraphy, mainly during weekdays. Sleep efficiency was reduced in patients compared to control participants. Patients had a marked temperature rhythm but with a significant phase advance (73 min) and a higher variability of the acrophase (from 2:24 PM to 9:25 PM) with no correlation to rest-activity cycle, contrary to healthy participants. Salivary cortisol levels were higher in patients compared to healthy people at any time of day. CONCLUSION We observed a marked circadian rhythmicity of temperature in patients with BVL, probably due to the influence of the light dark cycle. However, the lack of synchronization between the temperature and rest-activity cycle supports the hypothesis that the vestibular inputs are salient input to the circadian clock that enhance the stabilization and precision of both external and internal entrainment.
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Affiliation(s)
- Tristan Martin
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
| | - Sébastien Moussay
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
| | - Ingo Bulla
- Theoretical Biology and Biophysics, Group T-6, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Institut für Mathematik und Informatik, Universität Greifswald, Walther-Rathenau-Straße 47, 17487 Greifswald, Germany
| | - Jan Bulla
- Department of Mathematics, University of Bergen, P.O. Box 7800, 5020 Bergen, Norway
| | - Michel Toupet
- Centre d’explorations fonctionnelles oto-neurologiques, 10 rue Falguière, 75 015 Paris, France
| | - Olivier Etard
- Normandie Universite, Caen, France
- CHU de Caen, Service des Explorations Fonctionnelles, 14000 Caen, France
| | - Pierre Denise
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
- CHU de Caen, Service des Explorations Fonctionnelles, 14000 Caen, France
| | - Damien Davenne
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
| | - Antoine Coquerel
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
- CHU de Caen, Laboratoire de pharmacologie-toxicologie, 14000 Caen, France
| | - Gaëlle Quarck
- UNICAEN, COMETE, 14032 Caen, France
- INSERM, U1075, 14032 Caen, France
- Normandie Universite, Caen, France
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Jarraya S, Jarraya M, Souissi N. Diurnal variation and weekly pattern on physical performance in Tunisian children. Sci Sports 2015. [DOI: 10.1016/j.scispo.2014.05.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Facer-Childs E, Brandstaetter R. The impact of circadian phenotype and time since awakening on diurnal performance in athletes. Curr Biol 2015; 25:518-22. [PMID: 25639241 DOI: 10.1016/j.cub.2014.12.036] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 09/25/2014] [Accepted: 12/11/2014] [Indexed: 01/09/2023]
Abstract
Circadian rhythms, among other factors, have been shown to regulate key physiological processes involved in athletic performance. Personal best performance of athletes in the evening was confirmed across different sports. Contrary to this view, we identified peak performance times in athletes to be different between human "larks" and "owls" (also called "morningness/eveningness types" or "chronotypes" and referred to as circadian phenotypes in this paper), i.e., individuals with well-documented genetic and physiological differences that result in disparities between their biological clocks and how they entrain to exogenous cues, such as the environmental light/dark cycle and social factors. We found time since entrained awakening to be the major predictor of peak performance times, rather than time of day, as well as significant individual performance variations as large as 26% in the course of a day. Our novel approach combining the use of an athlete-specific chronometric test, longitudinal circadian analysis, and physical performance tests to characterize relevant sleep/wake and performance parameters in athletes allows a comprehensive analysis of the link between the circadian system and diurnal performance variation. We establish that the evaluation of an athlete's personal best performance requires consideration of circadian phenotype, performance evaluation at different times of day, and analysis of performance as a function of time since entrained awakening.
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Bessot N, Lericollais R, Gauthier A, Sesboüé B, Bulla J, Moussay S. Diurnal variation in gait characteristics and transition speed. Chronobiol Int 2014; 32:136-42. [DOI: 10.3109/07420528.2014.959128] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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20
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Morning/Evening differences in somatosensory inputs for postural control. BIOMED RESEARCH INTERNATIONAL 2014; 2014:287436. [PMID: 25210709 PMCID: PMC4151602 DOI: 10.1155/2014/287436] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2014] [Revised: 07/24/2014] [Accepted: 07/24/2014] [Indexed: 12/26/2022]
Abstract
The underlying processes responsible for the differences between morning and afternoon measurements of postural control have not yet been clearly identified. This study was conducted to specify the role played by vestibular, visual, and somatosensory inputs in postural balance and their link with the diurnal fluctuations of body temperature and vigilance level. Nineteen healthy male subjects (mean age: 20.5 ± 1.3 years) participated in test sessions at 6:00 a.m. and 6:00 p.m. after a normal night's sleep. Temperature was measured before the subjects completed a sign cancellation test and a postural control evaluation with eyes both open and closed. Our results confirmed that postural control improved throughout the day according to the circadian rhythm of body temperature and sleepiness/vigilance. The path length as a function of surface ratio increased between 6:00 a.m. and 6:00 p.m. This is due to a decrease in the centre-of-pressure surface area, which is associated with an increase in path length. Romberg's index did not change throughout the day; however, the spectral analysis (fast Fourier transform) of the centre-of-pressure excursions (in anteroposterior and mediolateral directions) indicated that diurnal fluctuations in postural control may occur via changes in the different processes responsible for readjustment via muscle contractions.
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Chtourou H, Aloui A, Hammouda O, Souissi N, Chaouachi A. Diurnal variation in long- and short-duration exercise performance and mood states in boys. SPORT SCIENCES FOR HEALTH 2014. [DOI: 10.1007/s11332-014-0190-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Lyerly JE, Huber LR, Warren-Findlow J, Racine EF, Dmochowski J. Is breakfast skipping associated with physical activity among U.S. adolescents? A cross-sectional study of adolescents aged 12-19 years, National Health and Nutrition Examination Survey (NHANES). Public Health Nutr 2014; 17:896-905. [PMID: 23534672 PMCID: PMC10282471 DOI: 10.1017/s1368980013000700] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 01/30/2013] [Accepted: 02/12/2013] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To examine the association between breakfast skipping and physical activity among US adolescents aged 12-19 years. DESIGN A cross-sectional study of nationally representative 2007-2008 National Health and Nutrition Examination Survey (NHANES) data. SETTING Breakfast skipping was assessed by two 24 h dietary recalls. Physical activity was self-reported by participants and classified based on meeting national recommendations for physical activity for the appropriate age group. Multiple logistic regression analysis was used to model the association between breakfast skipping and physical activity while controlling for confounders. SUBJECTS A total of 936 adolescents aged 12-19 years in the USA. RESULTS After adjusting for family income, there was no association between breakfast skipping and meeting physical activity guidelines for age among adolescents aged 12-19 years (OR = 0.95, 95% CI 0.56, 1.32). CONCLUSIONS Findings from the study differ from previous research findings on breakfast skipping and physical activity. Therefore, further research that uses large, nationally representative US samples and national recommended guidelines for physical activity is needed.
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Affiliation(s)
- Jordan E Lyerly
- Department of Public Health Sciences, The University of North Carolina at Charlotte, College of Health and Human Services, 9201 University City Blvd, Charlotte, NC 28223-0001, USA
| | - Larissa R Huber
- Department of Public Health Sciences, The University of North Carolina at Charlotte, College of Health and Human Services, 9201 University City Blvd, Charlotte, NC 28223-0001, USA
| | - Jan Warren-Findlow
- Department of Public Health Sciences, The University of North Carolina at Charlotte, College of Health and Human Services, 9201 University City Blvd, Charlotte, NC 28223-0001, USA
| | - Elizabeth F Racine
- Department of Public Health Sciences, The University of North Carolina at Charlotte, College of Health and Human Services, 9201 University City Blvd, Charlotte, NC 28223-0001, USA
| | - Jacek Dmochowski
- Department of Mathematics and Statistics, The University of North Carolina at Charlotte, Charlotte, NC, USA
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Chan-Thim E, Dumont M, Moullec G, Rizk AK, Wardini R, Trutschnigg B, Paquet J, de Lorimier M, Parenteau S, Pepin V. Clinical Impact of Time of Day on Acute Exercise Response in COPD. COPD 2013; 11:204-11. [DOI: 10.3109/15412555.2013.836167] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Effect of static and dynamic stretching on the diurnal variations of jump performance in soccer players. PLoS One 2013. [PMID: 23940589 DOI: 10.1371/journal.pone.0070534.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
PURPOSE The present study addressed the lack of data on the effect of different types of stretching on diurnal variations in vertical jump height - i.e., squat-jump (SJ) and countermovement-jump (CMJ). We hypothesized that dynamic stretching could affect the diurnal variations of jump height by producing a greater increase in short-term maximal performance in the morning than the evening through increasing core temperature at this time-of-day. METHODS Twenty male soccer players (age, 18.6±1.3 yrs; height, 174.6±3.8 cm; body-mass, 71.1±8.6 kg; mean ± SD) completed the SJ and CMJ tests either after static stretching, dynamic stretching or no-stretching protocols at two times of day, 07:00 h and 17:00 h, with a minimum of 48 hours between testing sessions. One minute after warming-up for 5 minutes by light jogging and performing one of the three stretching protocols (i.e., static stretching, dynamic stretching or no-stretching) for 8 minutes, each subject completed the SJ and CMJ tests. Jumping heights were recorded and analyzed using a two-way analysis of variance with repeated measures (3 [stretching]×2 [time-of-day]). RESULTS The SJ and CMJ heights were significantly higher at 17:00 than 07:00 h (p<0.01) after the no-stretching protocol. These daily variations disappeared (i.e., the diurnal gain decreased from 4.2±2.81% (p<0.01) to 1.81±4.39% (not-significant) for SJ and from 3.99±3.43% (p<0.01) to 1.51±3.83% (not-significant) for CMJ) after dynamic stretching due to greater increases in SJ and CMJ heights in the morning than the evening (8.4±6.36% vs. 4.4±2.64%, p<0.05 for SJ and 10.61±5.49% vs. 6.03±3.14%, p<0.05 for CMJ). However, no significant effect of static stretching on the diurnal variations of SJ and CMJ heights was observed. CONCLUSION Dynamic stretching affects the typical diurnal variations of SJ and CMJ and helps to counteract the lower morning values in vertical jump height.
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Chtourou H, Aloui A, Hammouda O, Chaouachi A, Chamari K, Souissi N. Effect of static and dynamic stretching on the diurnal variations of jump performance in soccer players. PLoS One 2013; 8:e70534. [PMID: 23940589 PMCID: PMC3734300 DOI: 10.1371/journal.pone.0070534] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 06/24/2013] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The present study addressed the lack of data on the effect of different types of stretching on diurnal variations in vertical jump height - i.e., squat-jump (SJ) and countermovement-jump (CMJ). We hypothesized that dynamic stretching could affect the diurnal variations of jump height by producing a greater increase in short-term maximal performance in the morning than the evening through increasing core temperature at this time-of-day. METHODS Twenty male soccer players (age, 18.6±1.3 yrs; height, 174.6±3.8 cm; body-mass, 71.1±8.6 kg; mean ± SD) completed the SJ and CMJ tests either after static stretching, dynamic stretching or no-stretching protocols at two times of day, 07:00 h and 17:00 h, with a minimum of 48 hours between testing sessions. One minute after warming-up for 5 minutes by light jogging and performing one of the three stretching protocols (i.e., static stretching, dynamic stretching or no-stretching) for 8 minutes, each subject completed the SJ and CMJ tests. Jumping heights were recorded and analyzed using a two-way analysis of variance with repeated measures (3 [stretching]×2 [time-of-day]). RESULTS The SJ and CMJ heights were significantly higher at 17:00 than 07:00 h (p<0.01) after the no-stretching protocol. These daily variations disappeared (i.e., the diurnal gain decreased from 4.2±2.81% (p<0.01) to 1.81±4.39% (not-significant) for SJ and from 3.99±3.43% (p<0.01) to 1.51±3.83% (not-significant) for CMJ) after dynamic stretching due to greater increases in SJ and CMJ heights in the morning than the evening (8.4±6.36% vs. 4.4±2.64%, p<0.05 for SJ and 10.61±5.49% vs. 6.03±3.14%, p<0.05 for CMJ). However, no significant effect of static stretching on the diurnal variations of SJ and CMJ heights was observed. CONCLUSION Dynamic stretching affects the typical diurnal variations of SJ and CMJ and helps to counteract the lower morning values in vertical jump height.
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Affiliation(s)
- Hamdi Chtourou
- Research Laboratory Sport Performance Optimization National Center of Medicine and Sciences in Sport (CNMSS), Tunis, Tunisia.
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Hammouda O, Chtourou H, Chaouachi A, Chahed H, Bellimem H, Chamari K, Souissi N. Time-of-day effects on biochemical responses to soccer-specific endurance in elite Tunisian football players. J Sports Sci 2013; 31:963-71. [DOI: 10.1080/02640414.2012.757345] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lericollais R, Gauthier A, Bessot N, Zouabi A, Davenne D. Morning anaerobic performance is not altered by vigilance impairment. PLoS One 2013; 8:e58638. [PMID: 23516522 PMCID: PMC3596288 DOI: 10.1371/journal.pone.0058638] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Accepted: 02/05/2013] [Indexed: 11/19/2022] Open
Abstract
The aim of this study was to determine the role played by vigilance on the anaerobic performance recorded during a Wingate test performed at the bathyphase (nadir) of the circadian rhythmicity. Twenty active male participants performed a 60-s Wingate test at 6 a.m. during 3 test sessions in counter-balanced order the day after either (i) a normal reference night, (ii) a total sleep deprivation night, or (iii) a total sleep deprivation night associated with an extended simulated driving task from 9 p.m. to 5 a.m. During this task, the number of inappropriate line crossings (ILCs) was used to control and quantify the effective decrease in the level of vigilance. The main findings show that (i) vigilance of each participant was significantly altered (i.e., a drastic and progressive increase in ILCs is shown during the 7.5 hours of driving) by the sleep deprivation night associated with an extended driving task; (ii) the subjective evaluation of vigilance performed by self-rated scale revealed an increased impairment of the vigilance level between the normal reference night, the total sleep deprivation night and the total sleep deprivation night associated with an extended driving task; and (iii) the morning following this last condition, during the Wingate test, the recorded cycling biomechanical parameters (peak power, mean power and fatigue index values, power decrease, and cycling kinetic and kinematic patterns) were not significantly different from the two other conditions. Consequently, these results show that anaerobic performances recorded during a Wingate test performed at the bathyphase of the circadian rhythmicity are not altered by a drastic impairment in vigilance. These findings seem to indicate that vigilance is probably not a factor that contributes to circadian variations in anaerobic performance.
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Affiliation(s)
- Romain Lericollais
- Normandie Université, Caen, France
- UniCaen, unité de recherche COMETE, Caen, France
- Institut national de la santé et de la recherche médicale, unité de recherche U1075 COMETE, Caen, France
- Centre Hospitalier Universitaire de Caen, Department of Clinical Physiology, Caen, France
| | - Antoine Gauthier
- Normandie Université, Caen, France
- UniCaen, unité de recherche COMETE, Caen, France
- Institut national de la santé et de la recherche médicale, unité de recherche U1075 COMETE, Caen, France
| | - Nicolas Bessot
- Normandie Université, Caen, France
- UniCaen, unité de recherche COMETE, Caen, France
- Institut national de la santé et de la recherche médicale, unité de recherche U1075 COMETE, Caen, France
| | - Amira Zouabi
- Normandie Université, Caen, France
- UniCaen, unité de recherche COMETE, Caen, France
- Institut national de la santé et de la recherche médicale, unité de recherche U1075 COMETE, Caen, France
| | - Damien Davenne
- Normandie Université, Caen, France
- UniCaen, unité de recherche COMETE, Caen, France
- Institut national de la santé et de la recherche médicale, unité de recherche U1075 COMETE, Caen, France
- * E-mail:
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Portaluppi F, Smolensky MH, Haus E, Fabbian F. Relevance of Chronobiology to the Research and Clinical Practice of Neurorehabilitation. Sleep Med Clin 2012. [DOI: 10.1016/j.jsmc.2012.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Bougard C, Espié S, Larnaudie B, Moussay S, Davenne D. Effects of time of day and sleep deprivation on motorcycle-driving performance. PLoS One 2012; 7:e39735. [PMID: 22761881 PMCID: PMC3386261 DOI: 10.1371/journal.pone.0039735] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Accepted: 05/30/2012] [Indexed: 01/17/2023] Open
Abstract
The aim of this study was to investigate whether motorcycle handling capabilities--measured by means of the efficiency of emergency manoeuvres--were dependent on prior sleep deprivation and time of day. Twelve male participants voluntarily took part in four test sessions, starting at 6 a.m., 10 a.m., 2 p.m., and 6 p.m., following a night either with or without sleep. Each test session comprised temperature and sleepiness measurements, before three different types of motorcycling tests were initiated: (1) stability in straight ahead riding at low speed (in "slow motion" mode and in "brakes and clutch" mode), (2) emergency braking and (3) crash avoidance tasks performed at 20 kph and 40 kph. The results indicate that motorcycle control at low speed depends on time of day, with an improvement in performance throughout the day. Emergency braking performance is affected at both speeds by time of day, with poorer performance (longer total stopping distance, reaction time and braking distance) in the morning, and also by sleep deprivation, from measurements obtained at 40 kph (incorrect initial speed). Except for a tendency observed after the sleepless night to deviate from the initial speed, it seems that crash avoidance capabilities are quite unaffected by the two disturbance factors. Consequently, some motorcycle handling capabilities (stability at low speed and emergency braking) change in the same way as the diurnal fluctuation observed in body temperature and sleepiness, whereas for others (crash avoidance) the participants were able to maintain their initial performance level despite the high levels of sleepiness recorded after a sleepless night. Motorcycle riders have to be aware that their handling capabilities are limited in the early morning and/or after sleep deprivation. Both these situations can increase the risk of falls and of being involved in a road accident.
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30
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Doheny EP, Greene BR, Foran T, Cunningham C, Fan CW, Kenny RA. Diurnal variations in the outcomes of instrumented gait and quiet standing balance assessments and their association with falls history. Physiol Meas 2012; 33:361-73. [PMID: 22369925 DOI: 10.1088/0967-3334/33/3/361] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
One in three adults aged over 65 falls every year, resulting in enormous costs to society. Incidents of falling vary with time of day, peaking in the early morning. The aim of this study was to determine if the ability of instrumented gait and balance assessments to discriminate between participants based on their falls history varies diurnally. Body-worn sensors were used during a 3 m gait assessment and a series of quiet standing balance tests. Each assessment was performed four times during a single day under supervised conditions in the participant's homes. 40 adults aged over 60 years (19 fallers) participated in this study. A range of parameters were derived for each assessment, and the ability of each parameter to discriminate between fallers and non-fallers at each recording time was examined. The effect of falls history on single support time varied significantly with recording time, with a significantly reduced single support time observed at the first and last recording session of the day. Differences were observed between fallers and non-fallers for a range of other gait parameters; however, these effects did not vary with assessment time. The quiet standing assessments examined in this study revealed significant variations with falls history; however, the sensitivity of the examined quiet standing assessments to falls risk does not appear to be time dependent. These results indicate that, with the exception of single support time, the association of gait and quiet standing balance parameters with falls risk does not vary diurnally.
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Affiliation(s)
- Emer P Doheny
- Technology Research for Independent Living Centre, St. James's Hospital, Dublin, Ireland.
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31
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Portaluppi F. The Medical Subject Headings® thesaurus remains inaccurate and incomplete for electronic indexing and retrieval of chronobiologic references. BIOL RHYTHM RES 2011. [DOI: 10.1080/09291016.2011.613619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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32
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Portaluppi F, Fabbian F, Manfredini F, Manfredini R. Lack of Time-of-Day Differences Is Not Necessarily Indicative of Lack of Circadian Influences. Chronobiol Int 2011; 28:731-3; author reply 733. [DOI: 10.3109/07420528.2011.609628] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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33
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Chtourou H, Zarrouk N, Chaouachi A, Dogui M, Behm DG, Chamari K, Hug F, Souissi N. Diurnal variation in Wingate-test performance and associated electromyographic parameters. Chronobiol Int 2011; 28:706-13. [PMID: 21793694 DOI: 10.3109/07420528.2011.596295] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The present study was designed to evaluate time-of-day effects on electromyographic (EMG) activity changes during a short-term intense cycling exercise. In a randomized order, 22 male subjects were asked to perform a 30-s Wingate test against a constant braking load of 0.087 kg·kg(-1) body mass during two experimental sessions, which were set up either at 07:00 or 17:00 h. During the test, peak power (P(peak)), mean power (P(mean)), fatigue index (FI; % of decrease in power output throughout the 30 s), and evolution of power output (5-s span) throughout the exercise were analyzed. Surface EMG activity was recorded in both the vastus lateralis and vastus medialis muscles throughout the test and analyzed over a 5-s span. The root mean square (RMS) and mean power frequency (MPF) of EMG were calculated. Neuromuscular efficiency (NME) was estimated from the ratio of power to RMS. Resting core temperature, P(peak), P(mean), and FI were significantly higher (p < .05) in the evening than morning test (e.g., P(peak): 11.6 ± 0.8 vs. 11.9 ± 1 W·kg(-1)). The results showed that power output decreased following two phases. During the first phase (first 20s), power output decreased rapidly and values were higher (p < .05) in the evening than in the morning. During the second phase (last 10s), power decreased slightly and appeared independent of the time of day of testing. This power output decrease was paralleled by evolution of the MPF and NME. During the first phase, NME and MPF were higher (p < .05) in the evening. During the second phase, NME and MPF were independent of time of day. In addition, no significant differences were noticed between 7:00 and 17:00 h for EMG RMS during the whole 30 s. Taken together, these results suggest that peripheral mechanisms (i.e., muscle power and fatigue) are more likely the cause of the diurnal variation of the Wingate-test performance rather than central mechanisms.
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Affiliation(s)
- Hamdi Chtourou
- Research Laboratory Sports Performance Optimisation, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
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Effects of sleep deprivation and time-of-day on selected physical abilities in off-road motorcycle riders. Eur J Appl Physiol 2011; 112:59-67. [DOI: 10.1007/s00421-011-1948-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Accepted: 03/25/2011] [Indexed: 12/14/2022]
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35
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Bougard C, Lepelley MC, Davenne D. The influences of time-of-day and sleep deprivation on postural control. Exp Brain Res 2010; 209:109-15. [PMID: 21188358 DOI: 10.1007/s00221-010-2524-8] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2010] [Accepted: 12/09/2010] [Indexed: 11/30/2022]
Abstract
The aim of this study was to check the combined and/or dissociated influences of time-of-day and sleep deprivation on postural control. Twenty subjects participated in test sessions which took place at 6:00 am, 10:00 am, 2:00 pm and 6:00 pm either after a normal night's sleep or after a night of total sleep deprivation. Postural control was evaluated by COP surface area, LFS ratio and Romberg's index. The results showed that postural control fluctuates diurnally according to three different periods, pronounced by sleep deprivation: (1) at 6:00 am, there was no modification by sleep deprivation; (2) at 10:00 am and 2:00 pm, an interaction effect was observed for COP surface area and LFS ratio after sleep deprivation. Values of COP surface area were significantly higher (P < 0.01) following the night of sleep deprivation than after the normal night's sleep (139.36 ± 63.82 mm² vs. 221.72 ± 137.13 mm² and 143.78 ± 75.31 mm² vs. 228.65 ± 125.09 mm², respectively); (3) at 6:00 pm, the LFS ratio was higher than during the two other periods (P < 0.001) whereas COP surface area decreased to the level observed at 6:00 am. At this time-of-day, only the LFS ratio was significantly increased (P < 0.05) by the night of sleep deprivation (0.89 ± 0.14 vs. 1.03 ± 0.30). This temporal evolution in postural control does not seem to be related to any deterioration in visual input as Romberg's index (150.09 ± 97.91) was not modified, regardless of the test session.
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36
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Portaluppi F, Smolensky MH. PERSPECTIVES ON THE CHRONOTHERAPY OF HYPERTENSION BASED ON THE RESULTS OF THE MAPEC STUDY. Chronobiol Int 2010; 27:1652-67. [DOI: 10.3109/07420528.2010.510788] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Francesco Portaluppi
- Hypertension Center, Department of Medicine, University Hospital “S. Anna” of Ferrara, Ferrara, Italy
| | - Michael H. Smolensky
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
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37
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Lericollais R, Gauthier A, Bessot N, Davenne D. Diurnal evolution of cycling biomechanical parameters during a 60-s Wingate test. Scand J Med Sci Sports 2010; 21:e106-14. [DOI: 10.1111/j.1600-0838.2010.01172.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Sargent C, Ferguson SA, Darwent D, Kennaway DJ, Roach GD. THE INFLUENCE OF CIRCADIAN PHASE AND PRIOR WAKE ON NEUROMUSCULAR FUNCTION. Chronobiol Int 2010; 27:911-21. [DOI: 10.3109/07420528.2010.488901] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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39
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Hayes LD, Bickerstaff GF, Baker JS. INTERACTIONS OF CORTISOL, TESTOSTERONE, AND RESISTANCE TRAINING: INFLUENCE OF CIRCADIAN RHYTHMS. Chronobiol Int 2010; 27:675-705. [DOI: 10.3109/07420521003778773] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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40
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Lericollais R, Gauthier A, Bessot N, Sesboüé B, Davenne D. TIME-OF-DAY EFFECTS ON FATIGUE DURING A SUSTAINED ANAEROBIC TEST IN WELL-TRAINED CYCLISTS. Chronobiol Int 2009; 26:1622-35. [DOI: 10.3109/07420520903534492] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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41
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Bougard C, Moussay S, Gauthier A, Espié S, Davenne D. Effects of waking time and breakfast intake prior to evaluation of psychomotor performance in the early morning. Chronobiol Int 2009; 26:324-36. [PMID: 19212844 DOI: 10.1080/07420520902774540] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Many studies conducted in the field of chronobiology report diurnal fluctuation in cognitive and physical performance that occurs in phase with the body temperature circadian rhythm. Waking time and whether or not breakfast is consumed are currently considered to influence the diurnal fluctuation in data collected in the morning at 06:00 h and evening at 18:00 h. Nineteen male subjects participated in four test sessions to examine if wake-up time (04:00 h or 05:00 h) and eating or not eating breakfast influence psychomotor performance capacity at 06:00 h. All four sessions were separated by >/=36 h and were completed in a counterbalanced order. Each test session comprised sign cancellation, Epworth Sleepiness Scale, simple reaction time, and manual dexterity tests. Most of the results indicate that psychomotor performance when evaluated at 06:00 h under each of the four different study situations (two waking times and two breakfast conditions) is not statistically significantly different. Consequently, previous results that documented diurnal fluctuations in morning and evening performance capacities, with test sessions at 06:00 h, are confirmed. Being less efficient in the early morning than in the afternoon potentially exposes people to elevated risk of accident and injury at this time of the day. Prior waking time and/or consumption of a light meal, plus other countermeasures mentioned in the literature, are insufficient to prevent this risk.
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