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- Atterfors, Johan, 1998, et al.
(författare)
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Machine Learning of Pacing Patterns for Half Marathon
- 2022
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Every year over 40 000 runners participate in Gothenburg Half Marathon, one of the world’s largest half-marathons. Based on publicly available results data (423 496 entries) for ten years (2010 – 2019), we investigate machine learning models for two tasks: prediction of finishing times and identification of runners risking hitting the wall. Our models improve results over the current baseline on finish time prediction and manage to correctly identify many of the runners who later hit the wall, although it also misclassifies many who do not.
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| 2. |
- Johansson, Moa, 1981, et al.
(författare)
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Pacing Patterns of Half-Marathon Runners: An analysis of ten years of results from Gothenburg Half Marathon
- 2023
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Ingår i: International Journal of Computer Science in Sport. - 1684-4769. ; 22:1, s. 124-138
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Tidskriftsartikel (refereegranskat)abstract
- The Gothenburg half Marathon is one of the word's largest half maratho races with over 40 000 participants each year. In order to reduce the number of runners risking over-straining, injury, or collapse, we would like to provide runners with advice to appropriately plan their pacing. Many participants are older or without extensive training experience and may particularly benefit from such pacing assistance. Our aim is to provide this with the help of machine learning. We first analyze a large publicly available dataset of results from the years 2010-2019 (n = 423 496) to identify pacing patterns related to age, sex, ability, and temperature of the race day. These features are then used to train machine learning models for predicting runner's finish time and to identify which runners are at risk of making severe pacing errors and which ones seem set to pace well. We finf that predictiong of finish time improves over the current baseline, while identification of pacing patterns correctly identifies over 70% of runners at risk of severe slowdowns, albeit with many false positives.
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| 3. |
- Ahmad Kiadaliri, Aliasghar, et al.
(författare)
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Association of knee pain and different definitions of knee osteoarthritis with health-related quality of life : A population-based cohort study in southern Sweden
- 2016
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Ingår i: Health and Quality of Life Outcomes. - : Springer Science and Business Media LLC. - 1477-7525. ; 14:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: While the impact of knee pain and knee osteoarthritis (OA) on health-related quality of life (HRQoL) has been investigated in the literature, there is a lack of knowledge on the impact of different definitions of OA on HRQoL. The main aim of this study was to measure and compare the impact of knee OA and its different definitions on HRQoL in the general population. Methods: A random sample of 1300 participants from Malmö, Sweden with pain in one or both knees in the past 12 months with duration ≥4 weeks and 650 participants without were invited to clinical and radiographic knee examination. A total of 1527 individuals with a mean (SD) age 69.4 (7.2) participated and responded to both generic (EQ-5D-3L) and disease-specific (the Knee injury and Osteoarthritis Outcome Score) questionnaires. Knee pain was defined as pain during the last month during most of the days. Knee OA was defined radiographically (equivalent to Kellgren and Lawrence grade ≥2) and clinically according to the American College of Rheumatology (ACR) criteria. Results: Of participants with either knee pain or knee OA or both, 7 % reported no problem for the EQ-5D-3L attributes. The corresponding proportion among references (neither knee pain nor OA) was 42 %. The participants with knee pain and OA had all HRQoL measures lower compared to those with knee pain but no OA. The ACR clinical definition of knee OA was associated with lower HRQoL than the definition based on radiographic knee OA (adjusted difference -0.08 in UK EQ-5D-3L index score). Conclusions: Applying different definitions of knee OA result in different levels of HRQoL and this is mainly explained by the knee pain experience. These differences may lead to discrepant conclusions from cost-utility analyses.
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| 4. |
- Albertsson, Per, 1956, et al.
(författare)
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Morbidity and use of medical resources in patients with chest pain and normal or near-normal coronary arteries.
- 1997
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Ingår i: The American journal of cardiology. - : Excerpta Medica, Inc.. - 0002-9149 .- 1879-1913. ; 79:3, s. 299-304
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Tidskriftsartikel (refereegranskat)abstract
- To evaluate morbidity and use of medical resources in patients with chest pain and normal or near-normal coronary angiograms: 2,639 consecutive patients who underwent coronary angiograms due to chest pain were registered. Two years thereafter all patients who showed normal or near-normal coronary angiograms were approached with a questionnaire regarding hospitalization during the last 4 years (2 years before and 2 years after angiography). All medical files were also examined. Of the patients who underwent angiography, 163 (6%) had no significant stenoses, and of these, 113 showed complete normal angiograms and 50 showed mild (i.e. <50%) stenoses. During the 2 years before diagnostic angiogram, 66% of the patients were hospitalized compared with only 35% during 2 years after angiography (p <0.001). The reduction in hospitalization was due to curtailed utilization of medical resources for cardiac reasons; mean days in hospital was 6.6 days before angiography versus 2.8 days after (p <0.001). There were no significant differences in hospitalization when comparing patients with mild stenoses and completely normal angiograms. There were, furthermore, no differences between patients with positive or negative exercise tests. Thus, the need for hospitalization is significantly reduced after a diagnostic angiogram reveals normal or near-normal coronary arteries.
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| 5. |
- Antoniadou-Plytaria, Kyriaki, 1989, et al.
(författare)
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Effect of Short-term and High-resolution Load Forecasting Errors on Microgrid Operation Costs
- 2022
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Ingår i: IEEE PES Innovative Smart Grid Technologies Conference Europe. - 9781665480321 ; 2022-October
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Konferensbidrag (refereegranskat)abstract
- The aim of this paper is to evaluate the effect of the load forecasting errors to the operation costs of a grid-connected microgrid. To this end, a microgrid energy scheduling optimization model was tested with deterministic and stochastic formulations under two solution approaches i.e., day-ahead and rolling horizon optimization. In total, twelve simulation test cases were designed receiving as input the forecasts provided by one of the three implemented machine learning models: linear regression, artificial neural network with backpropagation, and long short-term memory. Simulation results of the weekly operation of a real residential building (HSB Living Lab) showed no significant differences among the costs of the test cases for a daily mean absolute percentage forecast error of about 12%. These results suggest that operators of similar microgrid systems could use simplifying approaches, such as day-ahead deterministic optimization, and forecasts of similar, non-negligible accuracy without substantially affecting the microgrid's total cost as compared to the ideal case of perfect forecast. Improving the accuracy would mainly reduce the microgrid's peak power cost as shown by its 20.2% increase in comparison to the ideal case.
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| 8. |
- Levin, Lars-Åke, et al.
(författare)
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Health-Related Quality of Life of Ticagrelor versus Clopidogrel in Patients with Acute Coronary Syndromes-Results from the PLATO Trial
- 2013
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Ingår i: Value in Health. - : Wiley-Blackwell: No OnlineOpen / Elsevier. - 1098-3015 .- 1524-4733. ; 16:4, s. 574-580
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: The purpose of this study was to compare the effects of ticagrelor versus clopidogrel on health-related quality of life in the PLATelet inhibition and patient Outcomes (PLATO) trial. Background: The PLATO trial showed that ticagrelor was superior to clopidogrel for the prevention of cardiovascular death, myocardial infarction, or stroke in a broad population of patients with acute coronary syndromes. Methods: HRQOL in the PLATO study was measured at hospital discharge, 6-month visit, and end of treatment (anticipated at 12 months) by using the EuroQol five-dimensional (EQ-5D) questionnaire. All patients who had an EQ-5D questionnaire assessment at discharge from the index hospitalization (n = 15,212) were included in the study. Patients who died prior to the end-of-treatment visit were assigned an EQ-5D questionnaire value of 0. Results: The EQ-5D questionnaire value at discharge among 7631 patients assigned to ticagrelor was 0.847 and among 7581 patients assigned to clopidogrel was 0.846 (P = 0.71). At 12 months, the mean EQ-5D questionnaire value was 0.840 for ticagrelor and 0.832 for clopidogrel (P = 0.046). Excluding patients who died resulted in mean EQ-5D questionnaire values of 0.864 among ticagrelor patients and 0.863 among clopidogrel patients (P = 0.69). Conclusions: In patients hospitalized with acute coronary syndromes with or without ST-segment elevation, treatment with ticagrelor was associated with a lower mortality but otherwise no difference in quality of life relative to treatment with clopidogrel. The improved survival and reduction in cardiovascular events with ticagrelor are therefore obtained with no loss in quality of life.
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| 9. |
- O'Byrne, Paul M, et al.
(författare)
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Severe exacerbations and decline in lung function in asthma.
- 2009
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Ingår i: American journal of respiratory and critical care medicine. - 1535-4970. ; 179:1, s. 19-24
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Tidskriftsartikel (refereegranskat)abstract
- To evaluate the association between asthma exacerbations and the decline in lung function, as well as the potential effects of an inhaled corticosteroid, budesonide, on exacerbation-related decline in patients with asthma.
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| 10. |
- Sjöland, H, et al.
(författare)
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Prediction of left ventricular dysfunction in coronary artery disease from clinical and exercise test findings
- 1997
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Ingår i: Cardiology. - : S. Karger AG. - 0008-6312 .- 1421-9751. ; 88:3, s. 246-253
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Tidskriftsartikel (refereegranskat)abstract
- We studied the ability to predict depressed left ventricular ejection fraction (LVEF) from clinical and exercise test findings prior to surgery in consecutive patients who underwent coronary artery bypass grafting (CABG) from 1988 to 1991 (n = 663). Multivariate analysis showed a history of myocardial infarction, pathological Q-wave in resting ECG, systolic blood pressure at maximal exercise and the degree of mitral regurgitation as significant independent predictors of impaired LVEF. The relative risk (RR) of depressed LVEF was markedly increased for a previous history of myocardial infarction (RR 3.3, p < 0.0001) and a pathological Q-wave in resting ECG (RR 2.4, p < 0.0001). All associations found between depressed LVEF and exercise test results were poor, and of little value for discriminating patients with depressed LVEF. Thus, clinical data appear to be better markers of low LVEF than the information obtained from the exercise test.
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