{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T07:10:45Z","timestamp":1787728245997,"version":"build-2784847793"},"reference-count":104,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2024,10,4]],"date-time":"2024-10-04T00:00:00Z","timestamp":1728000000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"\nBackground<\/jats:title>\nHypoxia and hyperoxia can affect the acute psycho-physiological response to exercise. Recording various perceptual responses to exercise is of particular importance for investigating behavioral changes to physical activity, given that the perception of exercise-induced pain, discomfort or unpleasure, and a low level of exercise enjoyment are commonly associated with a low adherence to physical activity. Therefore, this study aimed to compare the acute perceptual and physiological responses to aerobic exercise under intermittent hypoxia-hyperoxia (IHHT), hypoxia-normoxia (IHT), and sustained normoxia (NOR) in young, recreational active, healthy males.<\/jats:p>\n<\/jats:sec>\n\nMethods<\/jats:title>\nUsing a randomized, single-blinded, crossover design, 15 males (age: 24.5 \u00b1 4.2 yrs) performed 40 min of submaximal constant-load cycling (at 60% peak oxygen uptake, 80 rpm) under IHHT (5 \u00d7 4 min hypoxia and hyperoxia), IHT (5 \u00d7 4 min hypoxia and normoxia), and NOR. Inspiratory fraction of oxygen during hypoxia and hyperoxia was set to 14% and 30%, respectively. Heart rate (HR), total hemoglobin (tHb) and muscle oxygen saturation (Sm<\/jats:sub>O2<\/jats:sub>) of the right vastus lateralis muscle were continuously recorded during cycling. Participants\u2019 peripheral oxygen saturation (Sp<\/jats:sub>O2<\/jats:sub>) and perceptual responses (i.e<\/jats:italic>., perceived motor fatigue, effort perception, perceived physical strain, affective valence, arousal, motivation to exercise, and conflict to continue exercise) were surveyed prior, during (every 4 min), and after cycling. Prior to and after exercise, peripheral blood lactate concentration (BLC) was determined. Exercise enjoyment was ascertained after cycling. For statistical analysis, repeated measures analyses of variance were conducted.<\/jats:p>\n<\/jats:sec>\n\nResults<\/jats:title>\nNo differences in the acute perceptual responses were found between conditions (p<\/jats:italic> \u2265 0.059, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> \u2264 0.18), while the physiological responses differed. Accordingly, Sp<\/jats:sub>O2<\/jats:sub> was higher during the hyperoxic periods during the IHHT compared to the normoxic periods during the IHT (p<\/jats:italic> < 0.001, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> = 0.91). Moreover, HR (p<\/jats:italic> = 0.005, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> = 0.33) and BLC (p<\/jats:italic> = 0.033, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> = 0.28) were higher during IHT compared to NOR. No differences between conditions were found for changes in tHb (p<\/jats:italic> = 0.684, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> = 0.03) and Sm<\/jats:sub>O2<\/jats:sub> (p<\/jats:italic> = 0.093, \u03b7p<\/jats:sub>2<\/jats:sup><\/jats:italic> = 0.16).<\/jats:p>\n<\/jats:sec>\n\nConclusion<\/jats:title>\nIHT was associated with a higher physiological response and metabolic stress, while IHHT did not lead to an increase in HR and BLC compared to NOR. In addition, compared to IHT, IHHT seems to improve reoxygenation indicated by a higher Sp<\/jats:sub>O2<\/jats:sub> during the hyperoxic periods. However, there were no differences in perceptual responses and ratings of exercise enjoyment between conditions. These results suggest that replacing normoxic by hyperoxic reoxygenation-periods during submaximal constant-load cycling under intermittent hypoxia reduced the exercise-related physiological stress but had no effect on perceptual responses and perceived exercise enjoyment in young recreational active healthy males.<\/jats:p>\n<\/jats:sec>","DOI":"10.7717\/peerj.18027","type":"journal-article","created":{"date-parts":[[2024,10,4]],"date-time":"2024-10-04T07:43:15Z","timestamp":1728027795000},"page":"e18027","source":"Crossref","is-referenced-by-count":2,"title":["Acute psycho-physiological responses to submaximal constant-load cycling under intermittent hypoxia-hyperoxia vs<\/i>. hypoxia-normoxia in young males"],"prefix":"10.7717","volume":"12","author":[{"given":"Tom","family":"Behrendt","sequence":"first","affiliation":[{"name":"Department of Sport Science, Chair for Health and Physical Activity, Otto-von-Guericke University Magdeburg, Magdeburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Bielitzki","sequence":"additional","affiliation":[{"name":"Department of Sport Science, Chair for Health and Physical Activity, Otto-von-Guericke University Magdeburg, Magdeburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Behrens","sequence":"additional","affiliation":[{"name":"University of Applied Sciences for Sport and Management Potsdam, Potsdam, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lina-Marie","family":"Jahns","sequence":"additional","affiliation":[{"name":"Department of Sport Science, Chair for Health and Physical Activity, Otto-von-Guericke University Magdeburg, Magdeburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malte","family":"Boersma","sequence":"additional","affiliation":[{"name":"Department of Sport Science, Chair for Health and Physical Activity, Otto-von-Guericke University Magdeburg, Magdeburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lutz","family":"Schega","sequence":"additional","affiliation":[{"name":"Department of Sport Science, Chair for Health and Physical Activity, Otto-von-Guericke University Magdeburg, Magdeburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"4443","published-online":{"date-parts":[[2024,10,4]]},"reference":[{"issue":"2","key":"10.7717\/peerj.18027\/ref-1","doi-asserted-by":"publisher","first-page":"523","DOI":"10.1152\/jappl.1986.61.2.523","article-title":"Effect of hyperoxia on substrate utilization during intense submaximal exercise","volume":"61","author":"Adams","year":"1986","journal-title":"Journal of Applied Physiology"},{"issue":"1","key":"10.7717\/peerj.18027\/ref-2","doi-asserted-by":"publisher","first-page":"287","DOI":"10.1152\/physrev.00015.2007","article-title":"Skeletal muscle fatigue: cellular 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