@inproceedings{WippertDeWittHubertsHonoldetal.2014,
  author    = {Wippert, Pia-Maria and De Witt Huberts, Jessie and Honold, Jasmin and Holzmann, Caroline and Rector, Michael V. and Mayer, Frank},
  title     = {Chronic stress measurement methods and their comparability},
  series = {Psychosomatic medicine},
  volume    = {76},
  booktitle = {Psychosomatic medicine},
  number    = {3},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0033-3174},
  pages     = {A129 -- A129},
  year      = {2014},
  language  = {en}
}
@article{MuellerMuellerStolletal.2014,
  author    = {M{\"u}ller, Juliane and M{\"u}ller, Steffen and Stoll, Josefine and Baur, Heiner and Mayer, Frank},
  title     = {Trunk extensor and flexor strength capacity in healthy young elite athletes aged 11-15 Years},
  series = {Journal of strength and conditioning research : the research journal of the NSCA},
  volume    = {28},
  journal   = {Journal of strength and conditioning research : the research journal of the NSCA},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {1064-8011},
  doi       = {10.1519/JSC.0000000000000280},
  pages     = {1328 -- 1334},
  year      = {2014},
  abstract  = {Mueller, J, Mueller, S, Stoll, J, Baur, H, and Mayer, F. Trunk extensor and flexor strength capacity in healthy young elite athletes aged 11-15 years. J Strength Cond Res 28(5): 1328-1334, 2014-Differences in trunk strength capacity because of gender and sports are well documented in adults. In contrast, data concerning young athletes are sparse. The purpose of this study was to assess the maximum trunk strength of adolescent athletes and to investigate differences between genders and age groups. A total of 520 young athletes were recruited. Finally, 377 (n = 233/144 M/F; 13 +/- 1 years; 1.62 +/- 0.11 m height; 51 +/- 12 kg mass; training: 4.5 +/- 2.6 years; training sessions/week: 4.3 +/- 3.0; various sports) young athletes were included in the final data analysis. Furthermore, 5 age groups were differentiated (age groups: 11, 12, 13, 14, and 15 years; n = 90, 150, 42, 43, and 52, respectively). Maximum strength of trunk flexors (Flex) and extensors (Ext) was assessed in all subjects during isokinetic concentric measurements (60 degrees center dot s(-1); 5 repetitions; range of motion: 55 degrees). Maximum strength was characterized by absolute peak torque (Flex(abs), Ext(abs); N center dot m), peak torque normalized to body weight (Flex(norm), Ext(norm); N center dot m center dot kg(-1) BW), and Flex(abs)/Ext(abs) ratio (RKquot). Descriptive data analysis (mean +/- SD) was completed, followed by analysis of variance (alpha = 0.05; post hoc test [Tukey-Kramer]). Mean maximum strength for all athletes was 97 +/- 34 N center dot m in Flex(abs) and 140 +/- 50 N center dot m in Ext(abs) (Flex(norm) = 1.9 +/- 0.3 N center dot m center dot kg(-1) BW, Ext(norm) = 2.8 +/- 0.6 N center dot m center dot kg(-1) BW). Males showed statistically significant higher absolute and normalized values compared with females (p < 0.001). Flex(abs) and Ext(abs) rose with increasing age almost 2-fold for males and females (Flex(abs), Ext(abs): p < 0.001). Flex(norm) and Ext(norm) increased with age for males (p < 0.001), however, not for females (Flex(norm): p = 0.26; Ext(norm): p = 0.20). RKquot (mean +/- SD: 0.71 +/- 0.16) did not reveal any differences regarding age (p = 0.87) or gender (p = 0.43). In adolescent athletes, maximum trunk strength must be discussed in a gender- and age-specific context. The Flex(abs)/Ext(abs) ratio revealed extensor dominance, which seems to be independent of age and gender. The values assessed may serve as a basis to evaluate and discuss trunk strength in athletes.},
  language  = {en}
}
@article{KoenigCasselIntziegiannietal.2014,
  author    = {K{\"o}nig, Niklas and Cassel, Michael and Intziegianni, Konstantina and Mayer, Frank},
  title     = {Inter-rater reliability and measurement error of sonographic muscle architecture assessments},
  series = {Journal of ultrasound in medicine},
  volume    = {33},
  journal   = {Journal of ultrasound in medicine},
  number    = {5},
  publisher = {American Institute of Ultrasound in Medicine},
  address   = {Laurel},
  issn      = {0278-4297},
  doi       = {10.7863/ultra.33.5.769},
  pages     = {769 -- 777},
  year      = {2014},
  abstract  = {Objectives-Sonography of muscle architecture provides physicians and researchers with information about muscle function and muscle-related disorders. Inter-rater reliability is a crucial parameter in daily clinical routines. The aim of this study was to assess the inter-rater reliability of sonographic muscle architecture assessments and quantification of errors that arise from inconsistent probe positioning and image interpretation. Results-Inter-rater reliability was good overall (ICC, 0.77-0.90; IRV, 9.0\%-13.4\%; bias LoA, 0.2 +/- 0.2-1.7 +/- 3.0). Superior and inferior pennation angles showed high systematic bias and LoA in all setups, ranging from 2.0 degrees +/- 2.2 degrees to 3.4 degrees +/- 4.1 degrees. The highest IRV was found for muscle thickness (13.4\%). "When the probe position was standardized, the SEM for muscle thickness decreased from 0.1 to 0.05 cm. Conclusions-Sonographic examination of muscle architecture of the medial gastrocnemius has good to high reliability. In contrast to pennation angle measurements, length measurements can be improved by standardization of the probe position.},
  language  = {en}
}
@inproceedings{ReschkeCasselIntziegiannietal.2014,
  author    = {Reschke, Antje and Cassel, Michael and Intziegianni, Konstantina and Mayer, Frank},
  title     = {Intra- and inter-rater reliability of sonographic cross-sectional area measurements in asymptomatic patella tendons},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {927 -- 928},
  year      = {2014},
  language  = {en}
}
@inproceedings{AppiahDwomohTorlakEngeletal.2014,
  author    = {Appiah-Dwomoh, Edem Korkor and Torlak, Firdevs and Engel, Tilman and Stoll, Josefine and M{\"u}ller, Juliane and Mayer, Frank},
  title     = {Does perturbed treadmill walking lead to emg-changes of the lower extremity?},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {827 -- 827},
  year      = {2014},
  language  = {en}
}
@inproceedings{TorlakTorlakAppiahDwomohetal.2014,
  author    = {Torlak, Firdevs and Torlak, Firdevs and Appiah-Dwomoh, Edem Korkor and Engel, Tilman and Stoll, Josefine and M{\"u}ller, Juliane and Mayer, Frank},
  title     = {Gender differences in lower leg muscular activity during provoked stumbling - a pilot study},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {728 -- 728},
  year      = {2014},
  language  = {en}
}
@inproceedings{MuellerCasselMuelleretal.2014,
  author    = {M{\"u}ller, Steffen and Cassel, Michael and M{\"u}ller, Juliane and Stoll, Josefine and Baur, Heiner and Mayer, Frank},
  title     = {Trunk strength in adolescent athletes with Spondylolisthesis with/without back pain during training: Pilot study},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {642 -- 642},
  year      = {2014},
  language  = {en}
}
@inproceedings{SilveiraCarlsohnLangenetal.2014,
  author    = {Silveira, Raul De Souza and Carlsohn, Anja and Langen, Georg and Otto, Christoph and Hain, Gerrit and Mayer, Frank},
  title     = {Reliability and day-to-day variability of peak fat oxidation during treadmill ergometry},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {631 -- 632},
  year      = {2014},
  language  = {en}
}
@inproceedings{KopinskiEngelCasseletal.2014,
  author    = {Kopinski, Stephan and Engel, Tilman and Cassel, Michael and Carlsohn, Anja and Mayer, Frank},
  title     = {Reliability of ultrasound measurements for subcutaneous adipose tissue in elite canoe athletes},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {539 -- 539},
  year      = {2014},
  language  = {en}
}
@inproceedings{EngelKopinskiCarlsohnetal.2014,
  author    = {Engel, Tilman and Kopinski, Stephan and Carlsohn, Anja and Cassel, Michael and Mayer, Frank},
  title     = {Correlation of sonographic subcutaneous adipose tissue measurements with air displacement plethysmography and calipermetry},
  series = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  volume    = {46},
  booktitle = {Medicine and science in sports and exercise : official journal of the American College of Sports Medicine},
  number    = {5},
  publisher = {Lippincott Williams \& Wilkins},
  address   = {Philadelphia},
  issn      = {0195-9131},
  pages     = {539 -- 539},
  year      = {2014},
  language  = {en}
}