@phdthesis{Zetzl2021,
  author    = {Zetzl, Teresa Margarete},
  title     = {Cancer-related fatigue intervention},
  doi       = {10.25972/OPUS-25166},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-251662},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2021},
  abstract  = {The incidence of cancer cases is rising steadily, while improved early detection and new cancer-specific therapies are reducing the mortality rate. In addition to curing cancer or prolonging life, increasing the quality of life is thus an important goal of oncology, which is why the burdens of cancer and treatment are becoming more important. A common side effect of cancer and its therapy is cancer-related fatigue, a tiredness that manifests itself on physical, emotional and cognitive levels and is not in proportion to previous physical efforts. Since the etiology of fatigue has not yet been fully clarified, symptom-oriented therapy is preferable to cause-specific therapy. In addition to activity management, sleep hygiene, and cognitive behavioral therapy, mind-body interventions such as yoga are recommended for reducing fatigue. Previous studies with small sample sizes were able to examine the efficacy of yoga regarding fatigue predominantly in patients with breast cancer. Long-term effects of yoga have rarely been studied and there have been no attempts to increase long-term effects through interventions such as reminder e-mails. This dissertation takes a closer look at these mentioned aspects of the study sample and long-term effects. An 8-week randomized controlled yoga intervention was conducted, including patients with different cancer types reporting mild to severe fatigue. Following the 8-week yoga therapy, a randomized group of participants received weekly reminder e-mails for 6 months for regular yoga practice, whereas the control group did not receive reminder e-mails. The first paper is a protocol article, which addresses the design and planned implementation of the research project this dissertation is based upon. This serves to ensure better replicability and comparability with other yoga studies. Due to a very low consent rate of patients in the pilot phase, it was necessary to deviate from the protocol article in the actual implementation and the planned inclusion criterion of fatigue >5 was reduced to fatigue >1. The second paper examines the efficacy of the eight-week yoga intervention. Patients in the intervention group who participated in the yoga classes seven times or more showed a significantly greater reduction in general and physical fatigue than those who participated less often. The efficacy of yoga was related to the number of attended yoga sessions. Women with breast cancer who participated in yoga reported greater reductions in fatigue than women with other cancer types. There was also an improvement for depression and quality of life after eight weeks of yoga therapy compared to no yoga therapy. These results imply that yoga is helpful in reducing depression and cancer-related fatigue, especially in terms of physical aspects and improving quality of life. The third paper focuses on the efficacy of reminder e-mails in terms of fatigue and practice frequency. Patients who received reminder e-mails reported greater reductions in general and emotional fatigue, as well as significant increases in practice frequency, compared to patients who did not receive reminder e-mails. Compared to fatigue scores before yoga, significantly lower fatigue and depression scores and higher quality of life were reported after yoga therapy and at follow-up six months later. Weekly e-mail reminders after yoga therapy may have positive effects on general and emotional fatigue and help cancer patients with fatigue establish a regular yoga practice at home. However, higher practice frequency did not lead to higher improvement in physical fatigue as found in Paper 2. This may indicate other factors that influence the efficacy of yoga practice on physical fatigue, such as mindfulness or side effects of therapy. This research project provides insight into the efficacy of yoga therapy for oncology patients with fatigue. It is important that such interventions be offered early, while fatigue symptoms are not too severe. Regular guided yoga practice can reduce physical fatigue, but subsequent yoga practice at home does not further reduce physical fatigue. Reminder emails after completed yoga therapy could only reduce patients' emotional fatigue. It may be that physical fatigue was reduced as much as possible by the previous yoga therapy and that there was a floor effect, or it may be that reminder emails are not suitable as an intervention to reduce physical fatigue at all. Further research is needed to examine the mechanisms of the different interventions in more detail and to find appropriate interventions that reduce all levels of fatigue equally.},
  subject      = {Erm{\"u}dungssyndrom},
  language  = {en}
}
@phdthesis{Wiest2022,
  author    = {Wiest, Wolfram},
  title     = {Entwicklung einer Apparatur zur In-situ-Erm{\"u}dungspr{\"u}fung von Zahnimplantaten mittels Synchrotron Micro-CT},
  doi       = {10.25972/OPUS-25770},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-257702},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2022},
  abstract  = {Die vorliegende Arbeit besch{\"a}ftigt sich mit der volumenbildgebenden Untersuchung von mechanischen Erm{\"u}dungsprozessen in Titan-Zahnimplantaten. Im Vordergrund steht die Entwicklung einer neuen Messmethode der In-situ-Mikrotomografie am Synchrotron. Zahnimplantate werden beim Gebrauch mechanisch wiederholt belastet (Wechsellast). Nach vielen zyklischen Belastungen k{\"o}nnen aufgrund von mikroplastische Verformungen Erm{\"u}dungssch{\"a}den auftreten. Diese k{\"o}nnen im Extremfall zum Versagen und Verlust eines Implantats f{\"u}hren. Die Computertomographie ist eine sehr geeignete zerst{\"o}rungsfrei Pr{\"u}fmethode, um Zahnimplantate zu untersuchen. Diese Arbeit erweitert die bisherige CT-Methode insofern, dass In-situ-Beobachtungen bei mechanischer Belastung m{\"o}glich sind. Die in dieser Arbeit untersuchten Zahnimplantate weisen an der Implantat-Abutment-Grenzfl{\"a}che bei eintretender Erm{\"u}dung einen Mikrospalt auf. Dieser wird als Indikator f{\"u}r einsetzende Fatigue- Prozesse benutzt. Der in der Synchrotron CT verf{\"u}gbare Inlinephasenkontrast erm{\"o}glicht eine verbesserte Bestimmung der Mikrospaltgr{\"o}ße. Da die schnellen Bewegungen der Erm{\"u}dungspr{\"u}fung mittels Standard-CT-Verfahren schwer zu erfassen sind, war die stroboskopische Aufnahmemethode das zielf{\"u}hrende Messverfahren, um in-situ-Pr{\"u}fung zu erm{\"o}glichen. Die 4 kommerziellen Zahnimplantattypen werden neben der In-situ-Fatigue Pr{\"u}fung auch mittels klassischer Erm{\"u}dungspr{\"u}fung untersucht und mit der Neuen Messmethode verglichen. Die hier entwickelte In-situ-Fatigue-Pr{\"u}fstation kann Proben bis zu 345 N tomographisch untersuchen. Neben den experimentellen Untersuchungen wird eine statische FEM-Betrachtung durchgef{\"u}hrt und mit experimentellen Messdaten verglichen. Zuletzt wird mit der entwickelten Messtation Knochenrisse in der Implantat Umgebung untersucht.},
  subject      = {Mikrocomputertomographie},
  language  = {de}
}