title: Sleep monitoring of a six-day microcycle in strength and high-intensity training.
abstract: This study examined the effect of microcycles in eccentric strength and high-intensity interval training (HIT) on sleep parameters and subjective ratings. Forty-two well-trained athletes (mean age 23.2 ± 2.4 years) were either assigned to the strength (n = 21; mean age 23.6 ± 2.1 years) or HIT (n = 21; mean age 22.8 ± 2.6 years) protocol. Sleep monitoring was conducted with multi-sensor actigraphy (SenseWear Armband™, Bodymedia, Pittsburg, PA, USA) and sleep log for 14 days. After a five-day baseline phase, participants completed either eccentric accented strength or high-intensity interval training for six days, with two training sessions per day. This training phase was divided into two halves (part 1 and 2) for statistical analyses. A three-day post phase concluded the monitoring. The Recovery-Stress Questionnaire for Athletes was applied at baseline, end of part 2, and at the last post-day. Mood ratings were decreased during training, but returned to baseline values afterwards in both groups. Sleep parameters in the strength group remained constant over the entire process. The HIT group showed trends of unfavourable sleep during the training phase (e.g., objective sleep efficiency at part 2: mean = 83.6 ± 7.8%, F3,60 = 2.57, P = 0.06, [Formula: see text] = 0.114) and subjective improvements during the post phase for awakenings (F3,60 = 2.96, P = 0.04, [Formula: see text] = 0.129) and restfulness of sleep (F3,60 = 9.21, P < 0.001, [Formula: see text] = 0.315). Thus, the HIT protocol seems to increase higher recovery demands than strength training, and sufficient sleep time should be emphasised and monitored.
authors.affiliation: a Faculty of Sport Science , Ruhr-University Bochum , Bochum , Germany.
authors.forename: Sarah
authors.initials: S
authors.lastname: Kölling
authors.affiliation: a Faculty of Sport Science , Ruhr-University Bochum , Bochum , Germany.
authors.forename: Thimo
authors.initials: T
authors.lastname: Wiewelhove
authors.affiliation: a Faculty of Sport Science , Ruhr-University Bochum , Bochum , Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Raeder
authors.affiliation: b Institute of Sport Science, Johannes Gutenberg University of Mainz , Mainz , Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Endler
authors.affiliation: a Faculty of Sport Science , Ruhr-University Bochum , Bochum , Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Ferrauti
authors.affiliation: c Institute of Sports and Preventive Medicine, University of Saarland , Saarbrücken , Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Meyer
authors.affiliation: a Faculty of Sport Science , Ruhr-University Bochum , Bochum , Germany.|d Schools of Human Movement Studies and Psychology, The University of Queensland , Brisbane , Australia.
authors.forename: Michael
authors.initials: M
authors.lastname: Kellmann
mesh_terms: D000328:Adult; D056352:Athletes / Q000706:statistics & numerical data*; D054874:Athletic Performance / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D017286:Polysomnography; D020127:Recovery of Function; D055070:Resistance Training / Q000379:methods*; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Recovery; endurance; fatigue; strength; training