| 1. |
- Koelling, Sarah, et al.
(författare)
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Validation of the Acute Recovery and Stress Scale (ARSS) and the Short Recovery and Stress Scale (SRSS) in three English-speaking regions
- 2020
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Ingår i: Journal of Sports Sciences. - : TAYLOR & FRANCIS LTD. - 0264-0414 .- 1466-447X. ; 38:2, s. 130-139
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Tidskriftsartikel (refereegranskat)abstract
- The Acute Recovery and Stress Scale (ARSS) and the Short Recovery and Stress Scale (SRSS) are well-established monitoring tools in German-speaking countries. This study aimed at validating them for English-speaking populations. Overall, 996 athletes (536 males, 24.9 +/- 9.1 years) of Australia/New Zealand (n = 380), the United Kingdom (n = 316), and North America (n = 300) participated. The 32-item ARSS consists of eight scales. These scales constitute the eight items of the SRSS with the corresponding ARSS items as descriptors. Confirmatory factor analysis (CFA), internal consistency (alpha), and discriminatory power of the items (r(it)) were calculated for the total and subsamples separately. Satisfactory discriminatory power (r(it) amp;gt; .30) for all ARSS and SRSS items and acceptable internal consistency (alpha amp;gt; .70) was achieved. CFA indicated good fit indices for the total sample and subsamples, and strong measurement invariance was found across subsamples and gender. Correlations between corresponding scales and items (r(s) = .68 - .78) support theoretical congruency as well as independent usage of both questionnaires. Construct validity of both tools is shown through hypothesis-conforming correlations with the Recovery-Stress Questionnaire for Athletes. Future studies may apply the ARSS and SRSS as monitoring tools in English-speaking regions worldwide.
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| 2. |
- Gerber, Markus, et al.
(författare)
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Usefulness of the Athlete Burnout Questionnaire (ABQ) as a screening tool for the detection of clinically relevant burnout symptoms among young elite athletes
- 2018
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Ingår i: Psychology of Sport And Exercise. - : Elsevier. - 1469-0292 .- 1878-5476. ; 39, s. 104-113
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: Having psychometrically sound instruments is essential to the understanding of the determinants and consequences of athlete burnout. Therefore, this study examines the psychometric properties of a German version of the Athlete Burnout Questionnaire (ABQ) and its usefulness as a screening tool for the detection of clinically relevant burnout symptoms. Design: Prospective study. Method: 257 young elite athletes were recruited from Swiss Olympic Sport Classes (37% females; M = 16.8 years, SD = 1.4). 197 students were assessed a second time after six months. All students filled in a standardized questionnaire about domain-specific and domain-unspecific burnout symptoms, depressive symptoms, stress, and life satisfaction. Results: Confirmatory factor analysis supported the three-factor structure of the ABQ. Moreover, all subscales had acceptable internal consistency. Support was also found for the convergent validity of the ABQ; all subscales were positively correlated with perceived stress, burnout and depression, whereas negative correlations existed with life satisfaction. By contrast, some ABQ subscales shared only limited variance, the three ABQ subscales did not predict each other across time, and none of the ABQ subscales was suitable for the screening of clinically relevant burnout symptoms. Conclusions: While the factor structure and internal consistency of the ABQ was supported, our study corroborates previous concerns about the psychometric properties and validity of the ABQ. While the ABQ has advanced research on athlete burnout, we hold that further debates about the most suitable way to assess burnout among elite athletes are urgently needed.
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| 3. |
- Lossow, Stefan, et al.
(författare)
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A reassessment of the discrepancies in the annual variation of delta D-H2O in the tropical lower stratosphere between the MIPAS and ACE-FTS satellite data sets
- 2020
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Ingår i: Atmospheric Measurement Techniques. - : Copernicus GmbH. - 1867-1381 .- 1867-8548. ; 13:1, s. 287-308
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Tidskriftsartikel (refereegranskat)abstract
- The annual variation of delta D in the tropical lower stratosphere is a critical indicator for the relative importance of different processes contributing to the transport of water vapour through the cold tropical tropopause region into the stratosphere. Distinct observational discrepancies of the delta D annual variation were visible in the works of Steinwagner et al. (2010) and Randel et al. (2012). Steinwagner et al. (2010) analysed MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) observations retrieved with the IMK/IAA (Institut fur Meteorologie und Klimaforschung in Karlsruhe, Germany, in collaboration with the Instituto de Astrofisica de Andalucia in Granada, Spain) processor, while Randel et al. (2012) focused on ACE-FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) observations. Here we reassess the discrepancies based on newer MIPAS (IMK/IAA) and ACE-FTS data sets, also showing for completeness results from SMR (Sub-Millimetre Radiometer) observations and a ECHAM/MESSy (European Centre for Medium-Range Weather Forecasts Hamburg and Modular Earth Sub-model System) Atmospheric Chemistry (EMAC) simulation (Eichinger et al., 2015b). Similar to the old analyses, the MIPAS data set yields a pronounced annual variation (maximum about 75 parts per thousand), while that derived from the ACE-FTS data set is rather weak (maximum about 25 parts per thousand). While all data sets exhibit the phase progression typical for the tape recorder, the annual maximum in the ACE-FTS data set precedes that in the MIPAS data set by 2 to 3 months. We critically consider several possible reasons for the observed discrepancies, focusing primarily on the MIPAS data set. We show that the delta D annual variation in the MIPAS data up to an altitude of 40 hPa is substantially impacted by a start altitude effect, i.e. dependency between the lowermost altitude where MIPAS retrievals are possible and retrieved data at higher altitudes. In itself this effect does not explain the differences with the ACE-FTS data. In addition, there is a mismatch in the vertical resolution of the MIPAS HDO and H2O data (being consistently better for HDO), which actually results in an artificial tape-recorder-like signal in delta D. Considering these MIPAS characteristics largely removes any discrepancies between the MIPAS and ACE-FTS data sets and shows that the MIPAS data are consistent with a delta D tape recorder signal with an amplitude of about 25 parts per thousand in the lowermost stratosphere.
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| 4. |
- Roys, Eirik Åsen, et al.
(författare)
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Sex Hormones and Adrenal Steroids : Biological Variation Estimated Using Direct and Indirect Methods
- 2023
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Ingår i: Clinical Chemistry. - : Oxford University Press. - 0009-9147 .- 1530-8561. ; 69:1, s. 100-109
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Tidskriftsartikel (refereegranskat)abstract
- Background Biological variation (BV) data may be used to develop analytical performance specifications (APS), reference change values (RCV), and support the applicability of population reference intervals. This study estimates within-subject BV (CVI) for several endocrine biomarkers using 3 different methodological approaches. Methods For the direct method, 30 healthy volunteers were sampled weekly for 10 consecutive weeks. Samples were analyzed in duplicate for 17-hydroxyprogesterone (17-OHP), androstenedione, cortisol, cortisone, estradiol, follicle-stimulating hormone (FSH), luteinizing hormone (LH), sex hormone-binding globulin (SHBG), and testosterone. A CV-ANOVA with outlier removal and a Bayesian model were applied to derive the CVI. For estradiol, FSH and LH, only the male subgroup was included. In the indirect method, using the same analytes and groups, pairs of sequential results were extracted from the laboratory information system. The total result variation for individual pairs was determined by identifying a central gaussian distribution in the ratios of the result pairs. The CVI was then estimated by removing the effect of analytical variation. Results The estimated CVI from the Bayesian model (mu CVP(i)) in the total cohort was: 17-OHP, 23%; androstenedione, 20%; cortisol, 18%; cortisone, 11%; SHBG, 7.4%; testosterone, 16%; and for the sex hormones in men: estradiol, 14%; FSH, 8%; and LH, 26%. CVI-heterogeneity was present for most endocrine markers. Similar CVI data were estimated using the CV-ANOVA and the indirect method. Conclusions Similar CVI data were obtained using 2 different direct and one indirect method. The indirect approach is a low-cost alternative ensuring implementation of CVI data applicable for local conditions.
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| 5. |
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| 6. |
- Wang, D.Y., et al.
(författare)
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Comparisons of MIPAS/ENVISAT ozone profiles with SMR/ODIN and HALOE/UARS observations
- 2005
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Ingår i: Advances in Space Research. - : Elsevier BV. - 1879-1948 .- 0273-1177. ; 36:5, s. 927-931
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Tidskriftsartikel (refereegranskat)abstract
- Ozone volume mixing ratio (VMR) profiles are measured by the Michelson Interferometer for passive atmospheric sounding (MIPAS) on ENVISAT. The data sets produced by the science data processor at Institut fur Meteorologic und Klimaforschung (IMK), Germany are compared with those obtained by halogen occultation experiment (HALOE) on UARS and by sub-millimetre radiometer (SMR) on ODIN. For the stratospheric measurements taken during September/October 2002, the three instruments show reasonable agreement, with global mean differences within 0.1-0.3 ppmv. The typical zonal mean differences are of 0.4 ppmv for HALOE and 0.6 ppmv for SMR (4-6%) in the ozone VMR peak region at 25-30 km near the equator, though larger differences of 0.8-1 ppmv (8-10%) are also observed in a small latitude-altitude region in the tropic. A positive bias of about 0.2-0.4 ppmv in the MIPAS data in the 35-40 km region has also been found. Further studies are under way to explain these differences.
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