Circadian Effects on Performance and Effort in Collegiate Swimmers

Journal of Circadian Rhythms
Austin AndersonKrista K Ingram

Abstract

Although individual athletic performance generally tends to peak in the evening, individuals who exhibit a strong diurnal preference perform better closer to their circadian peak. Time-of-day performance effects are influenced by circadian phenotype (diurnal preference and chronotype-sleep-wake patterns), homeostatic energy reserves and, potentially, genotype, yet little is known about how these factors influence physiological effort. Here, we investigate the effects of time of day, diurnal preference, chronotype, and PER3 (a circadian clock gene) genotype on both effort and performance in a population of Division I collegiate swimmers (n = 27). Participants competed in 200m time trials at 7:00 and 19:00 and were sampled pre- and post-trial for salivary α-amylase levels (as a measure of physiological effort), allowing for per-individual measures of performance and physiological effort. Hair samples were collected for genotype analysis (a variable-number tandem-repeat (VNTR) and a single nucleotide polymorphism (SNP) in PER3). Our results indicate significant and parallel time-of-day by circadian phenotype effects on swim performance and effort; evening-type swimmers swam on average 6% slower with 50% greater α-amylase levels in...Continue Reading

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Citations

Jul 19, 2020·Journal of Pineal Research·Michelle MageeUNKNOWN Delayed Sleep on Melatonin (DelSoM) Study Group
Jan 9, 2021·BMC Sports Science, Medicine and Rehabilitation·Seung-Taek LimEunjae Lee
May 6, 2019·Trends in Endocrinology and Metabolism : TEM·Drew Duglan, Katja A Lamia
Jun 2, 2021·Chronobiology International·Victoria AyalaMiguel Mariscal-Arcas

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Methods Mentioned

BETA
Genotyping
PCR
electrophoresis

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