186,155 research outputs found
Acute effects of static and dynamic stretching on jump performance after 15 min of reconditioning shooting phase in basketball players
No full text2016-09-15. Effects of long term stimulation of textured insoles on postural control in health elderly. In JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS - ISSN:0022-4707
Annino, G; Palazzo, F; Alwardat, M; Manzi, V; Lebone, P; Tancredi, V; Sinibaldi Salimei, P; Caronti...
Resp. del dato :
GIUSEPPE ANNINO
Identificativo :
hdl:2108/164271
01 - Articolo su rivista validato errore 10/11/2016 12:37 Sito docente: Success
Effects of stimulating surface during static upright posture in the elderly
No full textThis study aimed to investigate the influence of three stimulating surfaces based on center of pressure (CoP), anteroposterior sway velocity (VA/P), and medio-lateral sway velocity (VM/L) of 40 elderly subjects. CoP and VM/L showed a significant decrease in all visual conditions only in the stimulating surface whereas VA/P showed a significant decrease only on the same surface with eyes open. Results confirm the importance of multisensory stimulation in postural control in the elderly
Slopes And Speed Related Effects On Kinematic And Emg Patterns In Elite Race Walking.
No full textIntroduction. In human locomotion every external condition generates a strategy. The aim of this study is to analyze the kinematics parameters and to indentify the changes in movement pattern and muscle activity of race-walkers (RW). Methods. Twelve elite RW have race walking on a treadmill for 5 minutes each slope (0, 2 and 7%) in iso-efficiency speed (IES1) with heart rate and sEMG on leg muscles constantly monitored. Digital cameras (210 Hz) were used to record; Dartfish 5.5Pro was used to perform a 2D video analysis, while for statistical analysis was used Anova. (1) The IES (km/h) for each subject at 0% grade was the average speed during the best performance in the 10000 m race, minus 1 km/h, which corresponds to the ~50% Vo2MAX and requires an energy cost (Cw0) of 5.0 J/m/kg according to previous studies (Di Prampero 1986). Moreover, according to previous data (Minetti et al. 2002) the increase of Cw as a function of ground slope is: 0.15 * slope (%) + Cw0. We calculated for each ground slope the IES at which the Vo2 was equal to the oxygen consumption during level race walking using the following equation: Vo2= (Cw0/21(J/m) * (IES0/0.06 (m/min)) IES= (Vo2 * 21 * 0.06)/(0.15(Cw) * slope (%) + (Cw0)) Results IES, step length (SL) and frequency (SF) decrease as a function of the increasing slope: IES0 12.5 – IES2 11.8 – IES7 10.3; SL= (0-2%= -3.71%, n.s.; 0-7%= -12.23%, p<0.001); SF= (0-2%= -2.38%, n.s.; 0-7%= -6.07%, p<0.01). The contact time (CT) and heart rate (HR) increase at the increasing slope: CT= (0-2%= 2.46%, n.s.; 0-7%= 6.56%, p<0.01); HR= (0-2%= 0.62%, n.s.; 0-7%= 3.25%, p<0.05). The sEMG activity was reduced at the increasing slope in: tibialis anterior (0-2%= 22.49%, p<0.0001; 0-7%= 41.18%, p<0.0001); rectus femoris (0-2%= 15.35%, p<0.0001; 0-7%= 29.13%, p<0.0001). While the sEMG activity was increased in this muscles: vastus lateralis (0-2%= 22.95%, p<0.0001; 0-7%= 31.15%, p<0.0001); gastrocnemius medialis (0-2%= 21.40%, p<0.001; 0-7%= 48.37%, p<0.0001); biceps femoris (0-2%= 190.78%, p<0.0001; 0-7%= 201.37%, p<0.0001). Discussion. These results provide the resultant of the real mechanical work in different slopes without increasing energetic cost, validating the equation to calculate the speed in RW only at IES between zero and 2% gradient. While for higher gradient levels the procedure used in this study seems to overestimate the speed, probably due to the different biomechanics between walking (Minetti et al., 2002) and race walking. References Di Prampero PE. The energy cost of human locomotion on land and in water. (1986). Int J Sports Med, 7 (2), 55-72. Minetti AE, Moia C, Roi GS, Susta D, Ferretti G. Energy cost of walking and running at extreme uphill and downhill slopes. (2002). J Appl Physiol, 93(3),1039-1046
The efficacy of plantar stimulation on human balance control
No full textAim: The aim of this study was to evaluate the body sway using firm, foam, and firm textured
surfaces on 17 young adults. Method: Displacement of center of pressure (CoP), anteroposterior
velocity (VA/P), and mediolateral velocity (VM/L) were measured. Data: The data showed a
significant decrease of CoP, VA/P, and VM/L between support surfaces and vision. Results:
The results showed that, differently from the firm and foam, the textured surface is able to
increase the plantar feedback to maintaining postural control
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Effects of long term stimulation of textured insoles on postural control in health elderly
No full textBackground: The aim of this study was to confirm the effects of long term (chronic) stimulating surface (textured insole) on body balance of elderly people.
Methods: Twenty-four healthy elderly individuals were randomly distributed in two groups: control and experimental (67.75 ± 6.04 yrs, 74.55±12.14 kg, 163.7 ± 8.55 cm, 27.75 ± 3.04 kg/m2). Over one month, Control Group (CG) used smooth insoles and the Experimental Group (ExG) used textured insoles every day.
Velocity net (Vnet), anteroposterior (VA/P), mediolateral (VM/L) and sway path of CoP were assessed in different eye conditions before and after the experimental procedure.
Results: A mixed between-within subject ANOVA was conducted to assess the impact of soft and textured insoles and two visual conditions (vision vs no vision) across two time periods (α ≤ 0.05). The results showed any statistical difference between groups in each parameter assessed in this study. CoP, Vnet and VM/L in the experimental group showed a statistically significant effect of textured insoles only without vision (CoP: P= 0.002; η2=0.35), Vnet P=0.02; η2=0.24, VM/L P=0.04; η2=0.177) whereas VA/P showed no statistically significant effect in the same group and condition. There was no significant effect in Vnet, VA/P, VM/L and COP in control group that used smooth insole for both eye conditions.
Conclusions: The results confirm that postural stability improved in healthy elderly individuals, increasing somatosensory information's from feet plantar mechanoreceptors. Long term stimulation with textured insoles decreased CoP, Vnet and VM/L with eyes closed
- …
