initial force
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Autoři ve svém sdělení podávají zprávu o prvních zkušenostech s použitím sondy Freka Trelumina. Jde o transnazální, triluminální speciální sondu určenou pro duodenální nebo jejunální výživu a současnou dekompresi žaludku pri poruše jeho motility nebo nemožnosti perorálního prijmú. Seznamují především s užitím při konzervativním léčení akutních pankreatitíd a informují o dobrých zkušenostech se zaváděním sondy pod RTG kontrolou.
The authors present a report on their initial experience with the use of a Freka Trelumina probe. It is a nasal triluminal special probe for duodenal or jejunal nutrition and concurrent decompression of the stomach in case of its impaired motility and impossible oral nutrition. They draw attention in particular to the use in conservative treatment of acute pancreatitis and inform on favourable experience with the use of the probe under X-ray control.
- MeSH
- enterální výživa metody přístrojové vybavení MeSH
- lidé MeSH
- pankreatitida diagnóza terapie MeSH
- parenterální výživa metody přístrojové vybavení MeSH
- zdravotnické prostředky MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
BACKGROUND: Pulmonary vein isolation is the most prevalent approach for catheter ablation of paroxysmal atrial fibrillation. Long-term success of the procedure is diminished by arrhythmia recurrences occurring predominantly because of reconnections in previously isolated pulmonary veins. The aim of the EFFICAS I multicenter study was to demonstrate the correlation between contact force (CF) parameters during initial procedure and the incidence of isolation gaps (gap) at 3-month follow-up. METHOD AND RESULTS: A radiofrequency ablation catheter with integrated CF sensor (TactiCath, Endosense, Geneva, Switzerland) was used to perform pulmonary vein isolation in 46 patients with paroxysmal atrial fibrillation. During the ablation procedure, the operator was blinded to CF information. At follow-up, an interventional diagnostic procedure was performed to assess gap location as correlated to index procedure ablation parameters. At follow-up, 65% (26/40) of patients showed ≥1 gaps. Ablations with minimum Force-Time Integral (FTI) <400 gs showed increased likelihood for reconnection (P<0.001). Reconnection correlated strongly with minimum CF (P<0.0001) and minimum FTI (P=0.0007) at the site of gap. Gap occurrence showed a strong trend with lower average CF and average FTI. CF and FTI are generally higher on the right side, although the left anterior segment presents a unique challenge to achieve stable position with good CF. CONCLUSIONS: Minimum CF and minimum FTI values are strong predictors of gap formation. Optimal CF parameter recommendations are a target CF of 20 g and a minimum FTI of 400 gs for each new lesion.
- MeSH
- časové faktory MeSH
- dospělí MeSH
- elektrokardiografie * MeSH
- fibrilace síní patofyziologie chirurgie MeSH
- katetrizační ablace metody MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- mladý dospělý MeSH
- následné studie MeSH
- paroxysmální tachykardie patofyziologie chirurgie MeSH
- převodní systém srdeční patofyziologie chirurgie MeSH
- recidiva MeSH
- senioři MeSH
- venae pulmonales patofyziologie chirurgie MeSH
- výsledek terapie MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
- práce podpořená grantem MeSH
- randomizované kontrolované studie MeSH
- srovnávací studie MeSH
Performer autonomy (or self-control) has consistently been shown to enhance motor learning, and it can also provide immediate benefits for motor performance. Autonomy is also a key variable in the OPTIMAL theory of motor learning (Wulf & Lewthwaite, 2016). It is assumed to contribute to enhanced expectancies and goal-action coupling, affecting performance effectiveness and efficiency. The purpose of the present study was to examine whether providing autonomy support by giving performers choices would enhance their ability to maintain maximum force levels. Participants were asked to repeatedly produce maximum forces using a hand dynamometer. After 2 initial trials with the dominant and non-dominant hand, stratified randomization was used to assign participants with the same average maximum force to one of two groups, choice or yoked control groups. Choice group participants were able to choose the order of hands (dominant, non-dominant) on the remaining trials (3 per hand). For control group participants, hand order was determined by choice-group counterparts. Maximum forces decreased significantly across trials in the control group, whereas choice group participants were able to maintain the maximum forces produced on the first trial. We interpret these findings as evidence that performer autonomy promotes movement efficiency. The results are in line with the view that autonomy facilitates the coupling of goals and actions (Wulf & Lewthwaite, 2016).
- MeSH
- dospělí MeSH
- kosterní svaly fyziologie MeSH
- lidé MeSH
- motorické dovednosti fyziologie MeSH
- pohyb fyziologie MeSH
- sebekontrola * MeSH
- síla ruky fyziologie MeSH
- svalová síla fyziologie MeSH
- učení MeSH
- výběrové chování MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- randomizované kontrolované studie MeSH
Autoři prezentují první zkušenosti s perkutánní endoskopickou gastrostomií a upozorňují na její výhody i rizika. Vychází z vlastního souboru pacientů většinou ve velmi těžkém celkovém stavu, u kterých se podařilo pomoci této metody zajistit dlouhodobou enterální výživu.
The authors present their initial experience with percutaneous endoscopic gastrostomy and draw attention to its advantages and risks. As a basis they use their own group of patients, most of them in a very poor condition where it proved possible to ensure by this method enteral nutrition on a long-term basis.
- MeSH
- enterální výživa MeSH
- gastrointestinální endoskopie metody MeSH
- gastrostomie metody MeSH
- lidé MeSH
- Check Tag
- lidé MeSH
Biodegradable stents are promising treatments for many diseases, e.g., coronary artery disease, urethral diseases, tracheal diseases, and esophageal strictures. The mechanical properties of biodegradable stent materials play a key role in the safety and efficacy of treatment. In particular, insufficient creep resistance of the stent material could result in premature stent collapse or narrowing. Commercially available biodegradable self-expandable SX-ELLA stents made of polydioxanone monofilament were tested. A new, simple, and affordable method to measure the shear modulus of tiny viscoelastic wires is presented. The important mechanical parameters of the polydioxanone filament were obtained: the median Young's modulus was [Formula: see text] = 958 (922, 974) MPa and the shear modulus was [Formula: see text] = 357 (185, 387) MPa, resulting in a Poisson's ratio of ν = 0.34. The SX-ELLA stents exhibited significant force relaxation due to the stress relaxation of the polydioxanone monofilament, approximately 19% and 36% 10 min and 48 h after stent application, respectively. However, these results were expected, and the manufacturer and implanting clinician should be aware of the known behavior of these biodegradable materials. If possible, a biodegradable stent should be designed considering therapeutic force rather than initial force. Additionally, new and more advanced biodegradable shape-memory polymers should be considered for future study and use.
The presence of an abnormal P terminal force of the P wave in lead V1 (PTFV1) was demonstrated on the initial electrocardiograms in 69 of the 200 patients with transmural acute myocardial infarction. 61.5% of the total cases with a lethal outcome during hospitalization belonged to this group. The mortality of the patients who presented this ECG sign of left atrial hypertension at the onset was 53.7%, thus differing significantly from that in patients without the sign (22.1%). The PTFV1 anomaly has a prognostic value in patients without complications as well as in those with heart failure at the onset of the disease. The appearance during hospitalization of major arrhythmias and disturbances of conduction and of sudden death is significantly correlated to the presence of abnormal PTFV1 on the admission electrocardiograms.
- MeSH
- časové faktory MeSH
- elektrokardiografie * MeSH
- infarkt myokardu komplikace mortalita MeSH
- kardiogenní šok komplikace MeSH
- lidé středního věku MeSH
- lidé MeSH
- příjem pacientů MeSH
- prognóza MeSH
- senioři MeSH
- srdeční arytmie komplikace MeSH
- srdeční selhání komplikace MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
PURPOSE: The critical force (CF) concept, differentiating steady and non-steady state conditions, extends the critical power paradigm for sport climbing. This study aimed to validate CF for finger flexors derived from the 4 min all-out test as a boundary for the highest sustainable work intensity in sport climbers. METHODS: Twelve participants underwent multiple laboratory visits. Initially, they performed the 4 min intermittent contraction all-out test for CF determination. Subsequent verification visits involved finger-flexor contractions at various intensities, including CF, CF -2 kg, CF -4 kg, and CF -6 kg, lasting for 720 s or until failure, while monitoring muscle-oxygen dynamics of forearm muscles. RESULTS: CF, determined from the mean force of last three contractions, was measured at 20.1 ± 5.7 kg, while the end-force at 16.8 ± 5.2 kg. In the verification trials, the mean time to failure at CF was 440 ± 140 s, with only one participant completing the 720 s task. When the load was continuously lowered (-2 kg, -4 kg, and -6 kg), a greater number of participants (38%, 69%, and 92%, respectively) successfully completed the 720 s task. Changes of muscle-oxygen dynamics showed a high variability and could not clearly distinguish between exhaustive and non-exhaustive trials. CONCLUSIONS: CF, based on the mean force of the last three contractions, failed to reliably predict the highest sustainable work rate. In contrast, determining CF as the end-force of the last three contractions exhibited a stronger link to sustainable work. Caution is advised in interpreting forearm muscle-oxygen dynamics, lacking sensitivity for nuanced metabolic responses during climbing-related tasks.
- MeSH
- dospělí MeSH
- horolezectví * fyziologie MeSH
- kosterní svaly * fyziologie MeSH
- lidé MeSH
- mladý dospělý MeSH
- prsty ruky * fyziologie MeSH
- spotřeba kyslíku fyziologie MeSH
- svalová kontrakce fyziologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- validační studie MeSH
Vertical drop jump consists two landings of which the first one is the most frequently analysed one. Aim of this paper was to compare kinetic patterns between first and second landings and dominant and non-dominant leg between landings by analysing force-time curves and their variability across landings. 44 top level female handball players (N = 25) and volleyball players (N = 19) of average age 24 ± 4 y, height 181.1 ± 7.8 cm and weight 72.4 ± 8.0 kg agreed to participate in this study. Each subject completed 4 successful drop jumps from an initial height of 30 cm on two parallel ground reaction force platforms. Force-time curve analysis revealed significant differences (p < .05) in certain parts of the cycle between the two landings for each leg. Moreover, significant differences (p < .05) were found between dominant and non-dominant leg solely in the second landing. Second landings were shown to be significantly more variable (p < .001) than the first ones. Results of the current study confirm previous findings of different neuromuscular pathways used in two landings thus indicating a possible increased risk of ACL injury which highlights the importance of second landing analysis in drop vertical jump.
