There has been a boom of diagnostic devices allowing objectification of walking quality recently. This study is focused on the development of vertical reaction forces during the four months following total hip arthroplasty (THA - "total hip arthroplasty"). The main objective of this work is to describe what walking dynamics of patients looks like after THA. Whether four months after surgery, when patients completed the rehabilitation and spa treatment and put support away, the vertical reaction forces of both the affected and unaffected limb reached the values common among the "healthy" population. Another objective is to determine whether there have any walking dynamics changes occurred in four months after operation from the status before surgery and 2 months after the surgery. Information about the development of vertical reaction forces after THA can be used for correct timing of the rehabilitation process and can help the patient to return faster to normal life as well as extend the life of the implant.
- Keywords
- vertikální reakční síla, dynamická analýza pohybu, totální náhrada kyčelního kloubu, fáze chůze, krokový cyklus,
- MeSH
- Walking physiology MeSH
- Financing, Organized MeSH
- Humans MeSH
- Arthroplasty, Replacement, Hip methods utilization MeSH
- Orthopedic Procedures methods utilization MeSH
- Movement physiology MeSH
- Postoperative Period MeSH
- Rehabilitation MeSH
- Statistics as Topic MeSH
- Muscle Strength Dynamometer utilization MeSH
- Outcome and Process Assessment, Health Care MeSH
- Check Tag
- Humans MeSH
The aim of this study was to determine how an additional load influences the force-vs-time relationship of the countermovement vertical jump (CMVJ). The participants that took part in the experiment were 18 male university students who played sport recreationally, including regular games of volleyball. They were asked to perform a CMVJ without involving the arms under four conditions: without and with additional loads of 10%, 20%, and 30% of their body weight (BW). The vertical component of the ground reaction force (GRF) was measured by a force plate. The GRF was used to calculate the durations of the preparatory, braking, and acceleration phases, the total duration of the jump, force impulses during the braking and acceleration phases, average forces during the braking and acceleration phases, and the maximum force of impact at landing. Results were evaluated using repeated-measures ANOVA. Increasing the additional load prolonged both the braking and acceleration phases of the jump, with statistically significant changes in the duration of the acceleration phase found for an additional load of 20% BW. The magnitude of the force systematically and significantly increased with the additional load. The force impulse during the acceleration phase did not differ significantly between jumps performed with loads of 20% and 30% BW. The results suggest that the optimal additional load for developing explosive strength in vertical jumping ranges from 20% to 30% of BW, with this value varying between individual subjects.
- Publication type
- Journal Article 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.
- MeSH
- Humans MeSH
- Bite Force MeSH
- Denture, Partial, Fixed MeSH
- Dental Occlusion MeSH
- Check Tag
- Humans MeSH
- Publication type
- Case Reports MeSH
The aim of the study was to assess the effects of climbing ability and slope inclination on vertical loading both in terms the forces involved and physiological responses. Five novice and six intermediate female climbers completed a climbing route at three slope inclinations (85°, 90°, and 98°). The vertical loading during the climb was assessed by force-time integral using a Novel Pedar-X insole and physiological responses via oxygen uptake and heart rate. The novice climbers had a significantly lower (p < 0.05) vertical loading on foot holds and higher oxygen uptake and heart rate compared to intermediate climbers. A significant negative correlation was identified between the force-time integral and oxygen uptake (R = -0.72), and with heart rate (R = -0.64), respectively. The time-force integral decreased across the ascents with increasing slope inclination (p < 0.001). The results indicate that more advanced ability climbers make greater use of foot holds, with associated lowering in physiological response (oxygen uptake and heart rate) across all slope inclinations.
- Publication type
- Journal Article MeSH
Acta oto-laryngologica, ISSN 0365-5237 suppl. 230, 1968
20 s. : grafy ; 26 cm
- MeSH
- Orientation MeSH
- Ear, Inner MeSH
- Conspectus
- Patologie. Klinická medicína
- NML Fields
- otorinolaryngologie
V príspevku sa zaoberáme hľadaním možných ukazovateľov správnej techniky odrazu pri salte vpred skrčmo na základe vzťahov medzi časovými charakteristikami okamžitých síl vo vertikálnych a horizontálnych rovinách v realizačnej fáze odrazu. Výskumný súbor tvorilo 13 študentov fakulty športu. Ako metódu pre hľadanie vhodných ukazovateľov správnej techniky odrazu sme použili štatistickú významnosť p ? 0,05 Spearmanovho korelačného koefi cientu medzi jednotlivými sledovanými pomermi a počtom bodov za prevedenie salta vpred. Predpokladali sme, že niektoré zo sledovaných časových charakteristík budú predstavovať možný ukazovateľ správnej techniky odrazu. Hypotéza sa nám potvrdila. Možnými ukazovateľmi kvality odrazu, zoradené od najvýznamnejšieho, sú: premenná 4 (pomer času od dosiahnutia maximálnej sily vo vertikálnej rovine po ukončenie odrazu k celkovému času odrazu), premenná 6 (pomer času od dosiahnutia maximálnej sily vo vertikálnej rovine po ukončenie odrazu k času od dosiahnutia maximálnej sily v horizontálnej rovine po ukončenie odrazu), premenná 2 (čas od dosiahnutia maximálnej sily vo vertikálnej rovine po ukončenie odrazu).
The paper deals with looking for potential indicators of correct technique of bounce concerning a tucked forward somersault on the base of relations between time characteristics of instantaneous forces in a vertical and horizontal plane in a realization phase of the bounce. Our test-group was created by 13 students of Faculty of Sport. We used statistical signifi cance of Spearman correlation coeffi cients p ? 0,05 as a method for judging whether or not a particular ratio of the impulses of forces in the vertical and horizontal plane represents a suitable indicator of correct technique of bounce. We assumed that some of the observed ratios will represent the potential indicator of correct technique of bounce. Th e hypothesis was confi rmed. Th e potential indicators of bounce are the following: variable 4 (time frame since vertical force reached its maximum value to the end of jump to total time of bounce), variable 6 (time frame since vertical force reached its maximum value to the end of bounce to the time frame from when horizontal force reached its maximum value to the end of bounce), variable 2 (time frame since vertical force reached its maximum value to the end of bounce).
- MeSH
- Orthodontic Appliances, Fixed MeSH
- Orthodontic Appliances, Functional MeSH
- Overbite * diagnosis therapy MeSH
- Cephalometry methods MeSH
- Humans MeSH
- Orthodontic Extrusion methods MeSH
- Tooth Movement Techniques methods MeSH
- Age Factors MeSH
- Check Tag
- Humans MeSH
- Publication type
- Clinical Study MeSH
PURPOSE Many types of vertical jumps (VJ) are commonly used to assess the development of the level of explosive strength of lower limbs achieved after a training period. This study is focused on comparing various parameters of different types of VJ with 1 RM in Olympic-style weightlifting, squat and deadlift with an Olympic bar. he snatch r=0.8 r2= 0.64, clean and jerk r=0.81 r2= 0.65, back squat r=0.82 r2= 0.67 and deadlift r=0.78 r2= 0.60; for the SJ with hands on the hips and the snatch r= 0.76 r2= 0.57, clean and jerk r= 0.75 r2= 0.56, back squat r= 0.77 r2= 0.59 and deadlift r= 0.71 r2= 0.50. Significant correlation coefficients were not found for 1 RM in the snatch, clean and jerk, back squat and deadlift and the CMJ or SJ with and without arm swing in any of the following parameters: jump height (m), relative force (% of body weight), relative power output (W/kg of body weight). CONCLUSION The main finding is that the jump height (m) of the CMJ or SJ with or without arm swing did not correlate significantly with 1 RM in the snatch, clean and jerk, back squat and deadlift. Therefore, jump height measurement can be used as a motivation tool but not to predict maximum strength in Olympic bar exercises, or vice versa. We recommend using the average power output (W) parameter in the CMJ with using arms as a predictor of current performance level in exercises with an Olympic bar for men and women.
- MeSH
- Humans MeSH
- Motor Activity MeSH
- Athletes MeSH
- Athletic Performance MeSH
- Physical Exertion MeSH
- Weight Lifting * MeSH
- Check Tag
- Humans MeSH
- Publication type
- Review MeSH
Vertical niche partitioning might be one of the main driving forces explaining the high diversity of forest ecosystems. However, the forest's vertical dimension has received limited investigation, especially in temperate forests. Thus, our knowledge about how communities are vertically structured remains limited for temperate forest ecosystems. In this study, we investigated the vertical structuring of an arboreal caterpillar community in a temperate deciduous forest of eastern North America. Within a 0.2-ha forest stand, all deciduous trees ≥ 5 cm diameter at breast height (DBH) were felled and systematically searched for caterpillars. Sampled caterpillars were assigned to a specific stratum (i.e. understory, midstory, or canopy) depending on their vertical position and classified into feeding guild as either exposed feeders or shelter builders (i.e. leaf rollers, leaf tiers, webbers). In total, 3892 caterpillars representing 215 species of butterflies and moths were collected and identified. While stratum had no effect on caterpillar density, feeding guild composition changed significantly with shelter-building caterpillars becoming the dominant guild in the canopy. Species richness and diversity were found to be highest in the understory and midstory and declined strongly in the canopy. Family and species composition changed significantly among the strata; understory and canopy showed the lowest similarity. Food web analyses further revealed an increasing network specialization towards the canopy, caused by an increase in specialization of the caterpillar community. In summary, our study revealed a pronounced stratification of a temperate forest caterpillar community, unveiling a distinctly different assemblage of caterpillars dwelling in the canopy stratum.
- MeSH
- Biodiversity * MeSH
- Ecosystem * MeSH
- Forests MeSH
- Trees MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- North America MeSH
