Vieira, Elaine, Del Rosso, Sebastian, Almeida, Ilanna Maria Holanda, Varela-Sanz, Adrián, and Boullosa, Daniel (2025) The effect of time-of-day on post-submaximal running jump enhancement in morning type, novice and experienced endurance runners. Biological Rhythm Research, 56 (8). pp. 572-587.

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Abstract

The aim of this study was to determine the influence of time of day (ToD) on jump enhancement in endurance runners with different training backgrounds and chronotypes. Twenty-one male runners were divided in novice (NOV, n = 9), and experienced (EXP, n = 12). Chronotypes, sleep quality and countermovement jump (CMJ) performances were assessed. CMJ height was measured before and after a 30-min submaximal (~70% HRR) running bout on a treadmill in the morning vs. evening. Post-running CMJ performance was recorded at 0, 3, 6 and 9 min of recovery. Most athletes (77.3%) were categorized as morning types. There was a significant interaction (p = 0.003) between ToD and CMJ performance timepoint for the whole sample. Moreover, CMJ height post warm-up was significantly higher in the evening vs. morning (33.47 ± 7.31 vs. 32.07 ± 6.87 cm, p = 0.037). However, post-running CMJ performance only improved at 0 and 3 min of recovery during morning bouts in EXP (p = 0.005), while NOV did not exhibit jump enhancement. We conclude that post warm-up jump performance is greater in the evening vs. morning. However, endurance runners with more training experience showed greater jump enhancement in the morning after a 30-min submaximal running bout.

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