Effects of Time-of-Day Training Preference on Resistance-Exercise Performance. Issue 3 (3rd July 2021)

• Record Type: Journal Article
• Authors: Blazer, Hannah J.; Jordan, Cassidy L.; Pederson, Joseph A.; Rogers, Rebecca R.; Williams, Tyler D.; Marshall, Mallory R.; Ballmann, Christopher G.
• Is Part Of: Research quarterly for exercise and sport. Volume 92:Issue 3(2021)
• Page Start: 492
• Page End: 499
• Publication Date: 2021-07-03
• Subjects: Bench press -- morning -- evening -- velocity; Physical education and training -- Periodicals; Health education -- Periodicals; Recreation -- Periodicals; Physical Education and Training -- Periodicals; Sports -- Periodicals; Exercise -- Periodicals; Education -- Periodicals; Lichamelijke opvoeding; Sport; Exercice -- Périodiques; Sports -- Périodiques; 613.7105
• DOI: 10.1080/02701367.2020.1751032
• Languages: English
• ISSNs: 0270-1367

Abstract

ABSTRACT: Purpose: The purpose of this study was to investigate how time-of-day training preference influences resistance-exercise performance. Methods: Resistance trained males ( n = 12) were recruited for this study. In a crossover, counterbalanced design, participants completed two separate bench-press exercise trials at different times of day: (a) morning (AM; 8:00 hr) and (b) evening (PM; 16:00 hr). Participants answered a questionnaire on time-of-day training preference and completed a preferred (PREF) and nonpreferred (NON-PREF) time-of-day trial. For each trial, motivation was measured using a visual analog scale prior to exercise. Participants completed 2 sets × 2 repetitions at 75% 1-RM with maximum explosiveness separated by 5 min of rest. Mean barbell velocity was measured using a linear position transducer. Participants then completed 1 set × repetitions to failure (RTF) at 75% 1-RM. Rate of perceived exertion (RPE) was measured immediately following exercise. Results: Regardless of preference, velocity ( p = .025; effect size (ES) = 0.43) was higher during the PM versus AM trial. However, there were no significant differences in velocity ( p = .368; ES = 0.37) between PREF and NON-PREF time of day. There were no significant differences for repetitions between PREF and NON-PREF times ( p = .902; ES = 0.03). Motivation was higher in the PREF time versus NON-PREF ( p = .015; ES = 0.68). Furthermore, RPE was significantly lower during the PREF time of day ( p = .048; 0.55). Conclusions: Despite higher barbell velocity collectively at PM times, time-of-training preference did not largely influence resistance-exercise performance, while motivation is higher and RPE is lower during preferred times.