96 research outputs found
Prediction of flatwater kayaking performance
No full textPurpose: To determine the relative importance of anthropometric and physiological attributes for performance in the 1000-m, 500-m, and 200-m flatwater kayaking events. Methods: Eighteen competitive male kayakers completed performance trials over the 3 distances and a battery of anthropometric and physiological tests. Results: Performance times (mean ± SD) for 1000 m, 500 m, and 200 m were 262.56 ± 36.44 s, 122.10 ± 5.74 s, and 41.59 ± 2.12 s, respectively. Performance in all 3 events was correlated with a number of physiological parameters; in addition, 500-m and 200-m performance was correlated with upper body dimensions. 1000-m time was predicted by power output at lactate turnpoint expressed as a percentage of maximal aerobic power, work done in a 30-s ergometry test and work done in a 2-min ergometry test (adjusted R2 = 0.71, SEE = 5.72 s); 500-m time was predicted by work done and the fatigue index in a 30-s ergometry test, work done in a 2-min ergometry test, peak isometric and isokinetic function (adjusted R2 = 0.79, SEE = 2.49 s); 200-m time was predicted by chest circumference, humeral breadth, peak power, work done, and the fatigue index in a 30-s ergometry test (adjusted R2 = 0.71, SEE = 0.71 s). Conclusions: A number of physiological variables are correlated with performance in all events. 1000-m, 500-m, and 200-m times were predicted with a standard error of only 2.2%, 2.0%, and 1.7%, respectively
Naauwkeurige beschryvinge van Malabar en Choromandel, der zelver aangrenzende ryken, en het machtige eyland Ceylon : nevens een omstandige en grondigh doorzochte ontdekking en wederlegginge van de afgoderye der Oost-Indische heydenen ... /
No full textPrinter's device (bush) appears on t.p.'s preceding the 1st and 2nd pts. of c. 1 and 3rd pt. of c. 2. Device of farm workers and ants appears on t.p.'s before 3rd pt. of c. 1 and 1st and 2nd pts. of c. 2.Signatures: *⁶ A-2B⁴ [chi] ²A-2B⁴ ²2C² ²2D-E⁴ ²2F⁶ [chi] (A)-(Y)⁴ (Z)-(2A)⁶.Port. of Baldaeus signed in the plate: vr. Sÿdervelt I.v.D., A[braham] Blooteling sculp. Port. of Gerard Hulft by Blooteling after Govaert Flinck.Colophon on p. [11], last sequence: t' Amsterdam, by Daniel Bakkamude ...Added engraved t.p.Naauw-keurige beschrijvinge der Indische kusten Malabar ende Choromandel -- Beschryvinge van het machtige eyland Ceylon -- Nauwkeurige en waarachtige ontdekking en wederlegginge van de afgoderye der Oost-Indische heydenen.Mode of access: Internet.Copy 1 has printed bookseller's label of R.W. de Vries, Amsterdam.Binding, c. 1: parchment, boards tooled in blind with central stamps in double frames. Author & title in gilt on spine label. Edges sprinkled red. Copy 2: early mottled calf over pasteboard. Double gold fillet along edges of boards. Spine tooled in gilt, author on brown leather label.Leaf ¹2A4 cancelled in c. 1, blank in c. 2. Additional unpaginated gathering (²*⁴) interpolated between ²G4 and ²H1 in c. 2
Prediction of 200-m sprint kayaking performance
No full textThe aim of this study was to determine the anthropometric and physiological profile of 200-m sprint kayakers and to examine relationships with 200-m race performance. Twenty-six male kayakers who were categorised in two ability groups, international (Int) and national (Nat) level, underwent a battery of anthropometric and physiological tests and a 200-m race. Race time was significantly lower in Int than Nat (39.9 +/- 0.8 s and 42.6 +/- 0.9 s, respectively). Int demonstrated significantly greater measures of mesomorphy, biepycondylar humeral breadth, circumferences of the upper arm, forearm and chest, peak power and total work in a modified Wingate test, total work in a 2-min ergometry test, peak isokinetic power, and peak isometric force. Significant relationships were found between 200-m time and a number of anthropometric variables and anaerobic and dynamometric parameters. Stepwise multiple regression revealed that total work in the modified Wingate alone predicted 200-m race time (R2 = 0.53, SEE = 1.11 s) for all 26 subjects, while biepycondylar humeral breadth alone predicted race time (R2 = 0.54, SEE = 0.52 s) in Int. These results demonstrate that superior upper body dimensions and anaerobic capacities distinguish international-level kayakers from national-level athletes and may be used to predict 200-m performance
The Prevention and Treatment of Exercise-Induced Muscle Damage
No full textExercise-induced muscle damage (EIMD) can be caused by novel or unaccustomed exercise and results in a temporary decrease in muscle force production, a rise in passive tension, increased muscle soreness and swelling, and an increase in intramuscular proteins in blood. Consequently, EIMD can have a profound effect on the ability to perform subsequent bouts of exercise and therefore adhere to an exercise training programme. A variety of interventions have been used prophylactically and/or therapeutically in an attempt to reduce the negative effects associated with EIMD. This article focuses on some of the most commonly used strategies, including nutritional and pharmacological strategies, electrical and manual therapies and exercise. Long-term supplementation with antioxidants or β-hydroxy-β-methylbutyrate appears to provide a prophylactic effect in reducing EIMD, as does the ingestion of protein before and following exercise. Although the administration of high-dose NSAIDs may reduce EIMD and muscle soreness, it also attenuates the adaptive processes and should therefore not be prescribed for long-term treatment of EIMD. Whilst there is some evidence that stretching and massage may reduce muscle soreness, there is little evidence indicating any performance benefits. Electrical therapies and cryotherapy offer limited effect in the treatment of EIMD; however, inconsistencies in the dose and frequency of these and other interventions may account for the lack of consensus regarding their efficacy. Both as a cause and a consequence of this, there are very few evidence-based guidelines for the application of many of these interventions. Conversely, there is unequivocal evidence that prior bouts of eccentric exercise provide a protective effect against subsequent bouts of potentially damaging exercise. Further research is warranted to elucidate the most appropriate dose and frequency of interventions to attenuate EIMD and if these interventions attenuate the adaptation process. This will both clarify the efficacy of such strategies and provide guidelines for evidence-based practice
UvA-DARE (Digital Academic Repository) An AdaBoost Algorithm for Multiclass Semi-Supervised Learning
No full textAn AdaBoost algorithm for multiclass semi-supervised learning Tanha, J.; van Someren, M.W.; Afsarmanesh, H. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract-We present an algorithm for multiclass SemiSupervised learning which is learning from a limited amount of labeled data and plenty of unlabeled data. Existing semisupervised algorithms use approaches such as one-versus-all to convert the multiclass problem to several binary classification problems which is not optimal. We propose a multiclass semisupervised boosting algorithm that solves multiclass classification problems directly. The algorithm is based on a novel multiclass loss function consisting of the margin cost on labeled data and two regularization terms on labeled and unlabeled data. Experimental results on a number of UCI datasets show that the proposed algorithm performs better than the stateof-the-art boosting algorithms for multiclass semi-supervised learning
Het gezandtschap der Neêrlandtsche Oost-Indische Compagnie, aan den grooten Tartarischen Cham, den tegenwoordigen keizer van China : waar in de gedenkwaerdigste geschiedenissen, die onder het reizen door de Sineesche landtschappen, Quantung, Kiangsi, Nanking, Xantung en Peking, en aan het keizerlyke hof te Peking, zedert den jaare 1655 tot 1657 zyn voorgevallen, op het bondigste verhandelt worden : beneffens een naauwkeurige beschryvinge der Sineesche steden, dorpen, regeering, weetenschappen, handwerken, zeden, godsdiensten, gebouwen, drachten, scheepen, bergen, gewaffen, dieren, &c. en oorlogen tegen de Tarters : verçiert met over de 150 afbeeldtsels, na 't leven in Sina /
No full textIncludes index.Signatures: *⁴ A-2C⁴ a-2i⁴ 2k⁶.Pagination: [8], 208 p., [62] leaves of plates (some folded); 258, [10] p. (the last blank), [6] double-leaf plates.Added engraved title. Stipple-engraved port. of Joan Nieuhof. Folded double-page map of China and thirty-four double-page plates, tipped onto stubs at centerfold, as well as in-text ill. Plate of Paolinxi mentioned in index not present, and may be included only in Latin edition (KVK 4/14/06).Dedication signed by Hendrik Nieuhof, the editor.3rd Dutch edition. First published Amsterdam (Jacob van Meurs), 1665.Mode of access: Internet.Binding: vellum. Blind tooled in panel design with central medallions. Author & title in gilt on spine label. Bookseller's label of R.W.P. de Vries, Amsterdam
The efficacy of ergometry determined heart rates for flatwater kayak training
No full textThe aim of this study was to investigate the use of incremental ergometry determined heart rate training intensities for the control of kayak ergometer and open water kayak training. Eight well-trained male kayakers completed a maximal incremental exercise test on an air-braked kayak ergometer for the determination of LT(1) (the power output at which blood lactate concentration increased by > or = 1 mmol x L(-1)), the associated heart rate (HR-LT(1)), VO(2)peak, maximal heart rate and maximal aerobic power. Subjects then performed 20 min trials of kayak ergometry (E), open water kayaking in a single kayak (K1) and open water kayaking in a four-seat kayak (K4) at HR-LT(1). During the three trials, heart rate was continuously measured, and blood lactate concentration, rating of perceived exertion (RPE) and stroke rate were determined every 5 min. In all trials, exercise at HR-LT(1) resulted in stable blood lactate concentrations and a stable RPE. Comparison of the three trials demonstrated that the only difference was for RPE, which was lower in (K4) than in (E), (p < 0.05). The results demonstrate that the prescription of HR-LT(1) elicits similar blood lactate concentrations during kayak ergometer and open water kayak training in both single and team boats
Effect of a concentric warm-up exercise on eccentrically induced soreness and loss of function of the elbow flexor muscles
No full textThe aim of this study was to examine the effect of concentric warm-up exercise on eccentrically induced changes in muscle strength, range of motion, and soreness of the elbow flexors. Ten resistance-exercise naïve participants performed intermittent incremental eccentric actions (42 in total) of the elbow flexor muscles of each arm to induce muscle damage. The arms of each participant were randomly assigned either to a pre-eccentric exercise warm-up involving intermittent concentric exercise (warm-up) or no prior exercise (control). Strength, range of motion, and ratings of soreness were recorded before and 1, 2, 3, 4, and 7 days after exercise. Strength, range of motion, and soreness during muscular movements changed over time (P at most 0.01; Cohen's d at least 0.51, medium). There was an interaction (P < 0.001) for strength, showing a smaller reduction after exercise for warm-up than control (P < 0.001, d = 2.44, large effect). The decreased range of motion was less for warm-up than control for the arm while extended (P < 0.001), flexed (P = 0.002), and relaxed (P = 0.004). Muscle soreness was reduced for the warm-up group, while the muscle was flexed, extended, and relaxed compared with control (P < 0.001). The results demonstrate that a concentric warm-up exercise attenuates the reduction in loss of strength, range of motion, and muscle soreness after eccentric-exercise-induced muscle damage and might allow higher intensities of training to be performed
Hugo de Groots Nederlandtsche jaerboeken en historien : sedert het jaer MDLV tot het jaer MDCIX : met De belegering der stadt Grol en den aenkleven des jaers MDCXXVII, als ook Het tractaet van de Batavische nu Hollandtsche Republyk, en De vrye zeevaert : met aenteeckeningen, voorts met het leven des schrijvers, twee volkomen registers, en veele koopere platen verciert /
No full textincludes index to Jaer-boeken.Signatures: pi⁴ *² 2*-5*⁴ A-4O⁴ 4P² ²A⁴ B⁶ ³A-K⁴.Woodcut device on t.p. with initials of all four printers. Woodcut initials, some historiated with scenes from the Gospels, including brief citations. Tail-pieces.Added engraved t.p. by Abraham Blooteling after Zacharias Webber. The 73 leaves of plates comprise 21 engraved ports., and 26 double-page ill. and maps, mostly etched. Port. of Grotius by Abraham van der Wenne after Michiel van Mieresveld. Several ports. signed by Andries Vaillant as engraver. Many of the double-page etched ill. are by Jan Luiken; that following M1 is after Romeyne de Hooghe. Several bird's-eye views by Cornelis Decker. Gilliam van der Gouwen's engraving of a beached whale, following 2S3. Plates also appear in Pieter Christiaanszoon Bor's Oorsprongk, begin, en vervolgh der Nederlandsche oorlogen, issued 1679-84 by the same printers.Original Latin version first published Amsterdam, 1657.Mode of access: Internet.Pencilled initials of Lisa & Leonard Baskin on back pastedown together with a price code, Baskin's initial B written in pencil after signature letter L, and his printed labels for Fort Hill and Lurley Manor on front pastedown.Binding: vellum. Tooled in blind with center stamps and fillets. Author & title written on spine. Edges sprinkled blue
Compression garments and recovery from exercise-induced muscle damage: a meta-analysis
No full textThe purpose of study was to determine the effects of compression garments on recovery following damaging exercise. A systematic review and meta-analysis was conducted using studies that evaluated the efficacy of compression garments on measures of delayed onset muscle soreness (DOMS), muscular strength, muscular power and creatine kinase (CK). Studies were extracted from a literature search of online databases. Data were extracted from 12 studies, where variables were measured at baseline and at 24 or 48 or 72 h post exercise. Analysis of pooled data indicated that the use of compression garments had a moderate effect in reducing the severity of DOMS (Hedges’ g = 0.403, 95% confidence intervals (CI) 0.236 to 0.569, p<0.001), muscle strength (Hedges’ g = 0.462, 95% CI 0.221 to 0.703, p<0.001), muscle power (Hedges’ g = 0.487, 95% CI 0.267 to 0.707, p< 0.001) and CK (Hedges’ g = 0.439, 95% CI 0.171 to 0.706, p<0.001). These results indicate that compression garments are effective in enhancing recovery from muscle damage
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