Please use this identifier to cite or link to this item: doi:10.22028/D291-41414
Title: Effects on cardiorespiratory fitness of moderate-intensity training vs. energy-matched training with increasing intensity
Author(s): Reuter, Marcel
Rosenberger, Friederike
Barz, Andreas
Venhorst, Andreas
Blanz, Laura
Roecker, Kai
Meyer, Tim
Language: English
Title: Frontiers in Sports and Active Living
Volume: 5
Publisher/Platform: Frontiers
Year of Publication: 2024
Free key words: aerobic fitness
energy expenditure
endurance training
running economy
DDC notations: 610 Medicine and health
Publikation type: Journal Article
Abstract: Introduction: The present study investigated the role of training intensity in the dose–response relationship between endurance training and cardiorespiratory fitness (CRF). The hypothesis was that beginners would benefit from an increase in training intensity after an initial training phase, even if the energy expenditure was not altered. For this purpose, 26 weeks of continuous moderate training (control group, CON) was compared to training with gradually increasing intensity (intervention group, INC) but constant energy expenditure. Methods: Thirty-one healthy, untrained subjects (13 men, 18 women; 46 ± 8 years; body mass index 25.4 ± 3.3 kg m−2 ; maximum oxygen uptake, VO2max 34 ± 4 ml min−1 kg−1 ) trained for 10 weeks with moderate intensity [3 days/ week for 50 min/session at 55% heart rate reserve (HRreserve)] before allocation to one of two groups. A minimization technique was used to ensure homogeneous groups. While group CON continued with moderate intensity for 16 weeks, the INC group trained at 70% HRreserve for 8 weeks and thereafter participated in a 4 × 4 training program (high-intensity interval training, HIIT) for 8 weeks. Constant energy expenditure was ensured by indirect calorimetry and corresponding adjustment of the training volume. Treadmill tests were performed at baseline and after 10, 18, and 26 weeks. Results: The INC group showed improved VO2max (3.4 ± 2.7 ml kg−1 min−1 ) to a significantly greater degree than the CON group (0.4 ± 2.9 ml kg−1 min−1 ) (P = 0.020). In addition, the INC group exhibited improved Vmax (1.7 ± 0.7 km h−1 ) to a significantly greater degree than the CON group (1.0 ± 0.5 km h−1 ) (P = 0.001). The reduction of resting HR was significantly larger in the INC group (7 ± 4 bpm) than in the CON group (2 ± 6 bpm) (P = 0.001). The mean heart rate in the submaximal exercise test was reduced significantly in the CON group (5 ± 6 bpm; P = 0.007) and in the INC group (8 ± 7 bpm; P = 0.001), without a significant interaction between group and time point.
DOI of the first publication: 10.3389/fspor.2023.1298877
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-414141
ISSN: 2624-9367
Date of registration: 12-Jan-2024
Faculty: M - Medizinische Fakultät
Department: M - Sport- und Präventivmedizin
Professorship: M - Prof. Dr. Tim Meyer
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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