Investigation of the Changes in Performance Measurements Based on Circadian Rhythm

Ünver, Şaban; Atan, Tülin

doi:10.1080/09720073.2015.11891676

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…Diurnal variations in jump height. Studies investigating jump height had the highest proportion of studies with low risk of bias, and five (60,70,77,81,82) out of six studies reported a significant diurnal variation. The time window for peak performance was between 1300 and 2000 h in all five studies with significant results.…”

Section: Resultsmentioning

confidence: 99%

“…An overview of the study selection and the final 63 studies (23–85) included in this review is presented in Figure 1. In total, 841 participants (78% male, 19% female, 3% sex not reported) were included.…”

Section: Resultsmentioning

confidence: 99%

“…The risk of bias within studies is presented in Table 1 (23–85). The overall risk of bias was moderate to high.…”

Section: Resultsmentioning

confidence: 99%

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Diurnal Variation in Maximum Endurance and Maximum Strength Performance: A Systematic Review and Meta-analysis

Knaier

Qian

Roth

et al. 2021

Medicine &Amp; Science in Sports &Amp; Exercise

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Introduction: Diurnal variations in physical performance can affect athletes' success in competitive sports depending on whether the time of peak performance concurs with the time of competition. The purpose of this systematic review was to investigate the diurnal variation in maximum endurance and strength performance. Methods: The databases PubMed, EMBASE, and Web of Science were searched from inception to November 2020. The search string was externally reviewed according to PRESS guidelines, and the review was conducted in accordance to PRISMA guidelines and registered beforehand on PROSPERO. Eligibility criteria were that 1) the studies included humans and 2) any kind of maximum endurance or maximum strength test was performed at 3) a minimum of three different times of the day. There were no restrictions regarding study design, participants' sex, age, or fitness levels. Results: From 10,460 screened articles, 63 articles met all three inclusion criteria. Meta-analysis on the harmonizable 29 studies provided evidence for diurnal variations in physical performance. In detail, the overall effect sizes (95% confidence intervals) were 0.23 (0.05-0.40), 0.73 (0.37-1.09), 0.39 (0.18-0.60), and 0.79 (0.28-1.30) for endurance exercise tests, maximum power output in the Wingate test, handgrip strength, and jump height, respectively, all in favor of higher performance in the evening. The overall risk of bias in individual studies was moderately high. Conclusions: There is strong evidence that anaerobic power and jump height are maximal between 1300 and 2000 h. There is some evidence that handgrip strength peaks between 1400 and 2100 h, but only little evidence that there is a time of peak performance in maximum endurance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Diurnal Variation in Maximum Endurance and Maximum Strength Performance: A Systematic Review and Meta-analysis

Knaier

Qian

Roth

et al. 2021

Medicine &Amp; Science in Sports &Amp; Exercise

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show abstract

“…In this regard, [50] showed that the best time of day for any physical activity is between 04:30 PM and 06:30 PM. However, several studies [51][52][53] have not found diurnal and/or circadian fluctuations in physical performance. In fact, this daily fluctuation in performance results from the synchronization of physiological, psychological, and metabolic rhythms.…”

Section: Discussionmentioning

confidence: 99%

Pre-Exercise Caffeine Intake Attenuates the Negative Effects of Ramadan Fasting on Several Aspects of High-Intensity Short-Term Maximal Performances in Adolescent Female Handball Players

et al. 2023

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The aim of this investigation was to determine whether, after Ramadan, pre-exercise caffeine intake can reduce any possible negative effects of this month on short-term maximal performances in young female handball players. A randomized study involved thirteen young female handball players. Participants performed a squat jump (SJ), Illinois agility test (AG), and 5 m run shuttles test (total (TD) and peak (PD) distances) at 08:00 AM and 06:00 PM on three different occasions: one week before Ramadan (Pre-R), the last week of Ramadan (R), and the week after Ramadan (Post-R). A placebo (Pla) or caffeine (Caff) (6 mg·kg−1) was administered 60 min before exercise test sessions at two distinct times of day (08:00 AM and 06:00 PM) during the two periods: Pre and Post-R. The PSQI and dietary intake were assessed during all testing periods. The results revealed that Pre-R, (SJ, AG, TD, and PD) test performances were greater in the evening (PM) than in the morning (AM) (all p < 0.001). However, compared with Pre-R, PM performances declined significantly during R (all p < 0.001) and Post-R (p < 0.05, p < 0.01, p < 0.01 and p < 0.001, respectively). In addition, Pre-R, AM Caff produced moderate significant improvements compared with AM Pla, with small-to-no beneficial effects observed with PM Caff in SJ (4.8% vs. 1%), AG (1.8% vs. 0.8%), TD (2.8% vs. 0.3%), and PD (6% vs. 0.9%). Nevertheless, Caff produced moderate ergogenic effects during both AM and PM sessions during Post-R in SJ (4.4% vs. 2.4%), AG (1.7% vs. 1.5%), TD (2.9% vs. 1.3%), and PD (5.8% vs. 3%) with values approaching those of Pre-R Pla within the same time of day (p > 0.05, p > 0.05, p < 0.05, and p < 0.05, respectively). In summary, pre-exercise Caff intake with a dose equivalent to 6 mg·kg−1 reduced the negative effects of Ramadan fasting in several aspects of short-term maximal performances in young female handball players at both times of the day.

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Daily variation in performance measures related to anaerobic power and capacity: A systematic review

Ravindrakumar

Bommasamudram

Tod

et al. 2022

Chronobiology International

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Investigation of the Changes in Performance Measurements Based on Circadian Rhythm

Cited by 5 publications

References 1 publication

Diurnal Variation in Maximum Endurance and Maximum Strength Performance: A Systematic Review and Meta-analysis

Diurnal Variation in Maximum Endurance and Maximum Strength Performance: A Systematic Review and Meta-analysis

Pre-Exercise Caffeine Intake Attenuates the Negative Effects of Ramadan Fasting on Several Aspects of High-Intensity Short-Term Maximal Performances in Adolescent Female Handball Players

Daily variation in performance measures related to anaerobic power and capacity: A systematic review

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