@article{BehrendtBielitzkiBehrensetal.2022,
  author    = {Behrendt, Tom and Bielitzki, Robert and Behrens, Martin and Herold, Fabian and Schega, Lutz},
  title     = {Effects of intermittent hypoxia-hyperoxia on performance- and health-related outcomes in humans},
  series = {Sports medicine - open},
  volume    = {8},
  journal   = {Sports medicine - open},
  number    = {1},
  publisher = {Springer},
  address   = {Berlin [u.a.]},
  issn      = {2199-1170},
  doi       = {10.1186/s40798-022-00450-x},
  pages     = {28},
  year      = {2022},
  abstract  = {Background: Intermittent hypoxia applied at rest or in combination with exercise promotes multiple beneficial adaptations with regard to performance and health in humans. It was hypothesized that replacing normoxia by moderate hyperoxia can increase the adaptive response to the intermittent hypoxic stimulus. Objective: Our objective was to systematically review the current state of the literature on the effects of chronic intermittent hypoxia-hyperoxia (IHH) on performance- and health-related outcomes in humans. Methods: PubMed, Web of Science (TM), Scopus, and Cochrane Library databases were searched in accordance with PRISMA guidelines (January 2000 to September 2021) using the following inclusion criteria: (1) original research articles involving humans, (2) investigation of the chronic effect of IHH, (3) inclusion of a control group being not exposed to IHH, and (4) articles published in peer-reviewed journals written in English. Results: Of 1085 articles initially found, eight studies were included. IHH was solely performed at rest in different populations including geriatric patients (n = 1), older patients with cardiovascular (n = 3) and metabolic disease (n = 2) or cognitive impairment (n = 1), and young athletes with overtraining syndrome (n = 1). The included studies confirmed the beneficial effects of chronic exposure to IHH, showing improvements in exercise tolerance, peak oxygen uptake, and global cognitive functions, as well as lowered blood glucose levels. A trend was discernible that chronic exposure to IHH can trigger a reduction in systolic and diastolic blood pressure. The evidence of whether IHH exerts beneficial effects on blood lipid levels and haematological parameters is currently inconclusive. A meta-analysis was not possible because the reviewed studies had a considerable heterogeneity concerning the investigated populations and outcome parameters. Conclusion: Based on the published literature, it can be suggested that chronic exposure to IHH might be a promising non-pharmacological intervention strategy for improving peak oxygen consumption, exercise tolerance, and cognitive performance as well as reducing blood glucose levels, and systolic and diastolic blood pressure in older patients with cardiovascular and metabolic diseases or cognitive impairment. However, further randomized controlled trials with adequate sample sizes are needed to confirm and extend the evidence. This systematic review was registered on the international prospective register of systematic reviews (PROSPERO-ID: CRD42021281248) (https://www.crd.york.ac.uk/prospero/).},
  language  = {en}
}
@article{SalzwedelHeidlerHauboldetal.2017,
  author    = {Salzwedel, Annett and Heidler, Maria-Dorothea and Haubold, Kathrin and Schikora, Martin and Reibis, Rona Katharina and Wegscheider, Karl and J{\"o}bgens, Michael and V{\"o}ller, Heinz},
  title     = {Prevalence of mild cognitive impairment in employable patients after acute coronary event in cardiac rehabilitation},
  series = {Vascular Health and Risk Management},
  volume    = {13},
  journal   = {Vascular Health and Risk Management},
  publisher = {Dove Medical Press Ltd},
  address   = {Albany, Auckland},
  issn      = {1176-6344},
  doi       = {10.2147/VHRM.S121086},
  pages     = {55 -- 60},
  year      = {2017},
  abstract  = {Introduction: Adequate cognitive function in patients is a prerequisite for successful implementation of patient education and lifestyle coping in comprehensive cardiac rehabilitation (CR) programs. Although the association between cardiovascular diseases and cognitive impairments (CIs) is well known, the prevalence particularly of mild CI in CR and the characteristics of affected patients have been insufficiently investigated so far. Methods: In this prospective observational study, 496 patients (54.5 ± 6.2 years, 79.8\% men) with coronary artery disease following an acute coronary event (ACE) were analyzed. Patients were enrolled within 14 days of discharge from the hospital in a 3-week inpatient CR program. Patients were tested for CI using the Montreal Cognitive Assessment (MoCA) upon admission to and discharge from CR. Additionally, sociodemographic, clinical, and physiological variables were documented. The data were analyzed descriptively and in a multivariate stepwise backward elimination regression model with respect to CI. Results: At admission to CR, the CI (MoCA score < 26) was determined in 182 patients (36.7\%). Significant differences between CI and no CI groups were identified, and CI group was associated with high prevalence of smoking (65.9 vs 56.7\%, P = 0.046), heavy (physically demanding) workloads (26.4 vs 17.8\%, P < 0.001), sick leave longer than 1 month prior to CR (28.6 vs 18.5\%, P = 0.026), reduced exercise capacity (102.5 vs 118.8 W, P = 0.006), and a shorter 6-min walking distance (401.7 vs 421.3 m, P = 0.021) compared to no CI group. The age- and education-adjusted model showed positive associations with CI only for sick leave more than 1 month prior to ACE (odds ratio [OR] 1.673, 95\% confidence interval 1.07-2.79; P = 0.03) and heavy workloads (OR 2.18, 95\% confidence interval 1.42-3.36; P < 0.01). Conclusion: The prevalence of CI in CR was considerably high, affecting more than one-third of cardiac patients. Besides age and education level, CI was associated with heavy workloads and a longer sick leave before ACE.},
  language  = {en}
}
@misc{SalzwedelHeidlerHauboldetal.2016,
  author    = {Salzwedel, Annett and Heidler, Maria-Dorothea and Haubold, Kathrin and Schikora, Martin and Reibis, Rona Katharina and Wegscheider, Karl and J{\"o}bgens, Michael and V{\"o}ller, Heinz},
  title     = {Prevalence of mild cognitive impairment in employable patients after acute coronary event in cardiac rehabilitation},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-104113},
  pages     = {55 -- 60},
  year      = {2016},
  abstract  = {Introduction: Adequate cognitive function in patients is a prerequisite for successful implementation of patient education and lifestyle coping in comprehensive cardiac rehabilitation (CR) programs. Although the association between cardiovascular diseases and cognitive impairments (CIs) is well known, the prevalence particularly of mild CI in CR and the characteristics of affected patients have been insufficiently investigated so far. Methods: In this prospective observational study, 496 patients (54.5 ± 6.2 years, 79.8\% men) with coronary artery disease following an acute coronary event (ACE) were analyzed. Patients were enrolled within 14 days of discharge from the hospital in a 3-week inpatient CR program. Patients were tested for CI using the Montreal Cognitive Assessment (MoCA) upon admission to and discharge from CR. Additionally, sociodemographic, clinical, and physiological variables were documented. The data were analyzed descriptively and in a multivariate stepwise backward elimination regression model with respect to CI. Results: At admission to CR, the CI (MoCA score < 26) was determined in 182 patients (36.7\%). Significant differences between CI and no CI groups were identified, and CI group was associated with high prevalence of smoking (65.9 vs 56.7\%, P = 0.046), heavy (physically demanding) workloads (26.4 vs 17.8\%, P < 0.001), sick leave longer than 1 month prior to CR (28.6 vs 18.5\%, P = 0.026), reduced exercise capacity (102.5 vs 118.8 W, P = 0.006), and a shorter 6-min walking distance (401.7 vs 421.3 m, P = 0.021) compared to no CI group. The age- and education-adjusted model showed positive associations with CI only for sick leave more than 1 month prior to ACE (odds ratio [OR] 1.673, 95\% confidence interval 1.07-2.79; P = 0.03) and heavy workloads (OR 2.18, 95\% confidence interval 1.42-3.36; P < 0.01). Conclusion: The prevalence of CI in CR was considerably high, affecting more than one-third of cardiac patients. Besides age and education level, CI was associated with heavy workloads and a longer sick leave before ACE.},
  language  = {en}
}