Ground reaction force data in functional ankle instability during two cutting movements

Harokopion University of Athens, Athínai, Attica, Greece
Clinical Biomechanics (Impact Factor: 1.97). 06/2006; 21(4):405-11. DOI: 10.1016/j.clinbiomech.2005.11.010
Source: PubMed


Functional instability of the ankle joint may interfere with proper execution of quick cutting movements in sports. Previous studies have provided information regarding the ground reaction force characteristics in such movements in healthy players but no research was found in players with ankle instability. The purpose of this study was to evaluate and compare ground reaction forces in functionally unstable ankles with healthy ones during two cutting movements, the v-cut and the defensive shuffle.
Fifteen male basketball players with self reported unilateral functional instability and 17 matched controls, performed three v-cuts and three defensive shuffles on two synchronised force platforms. Both joints were tested and ground reaction forces analysed by an one-way ANOVA for independent groups to test differences between groups, and paired t-test to examine differences within affected players.
Unstable ankles, demonstrated significantly greater first vertical force peak, than contralateral unaffected joints (P < or = 0.05) and lower relative time to peak than controls (P< or = 0.05), during v-cut movement. No significant differences were seen in variables between groups during lateral shuffling.
Unstable ankles demonstrated altered patterns of ground reaction forces, with a rapid onset of high vertical force during the first millisecond post-impact, while the medial component was unchanged. Although the increased vertical forces are considered predisposing factors to repeated injury, this finding is likely a neuromuscular response making the ankle joint more stable avoiding excessive inversion forces.

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    • "). Inclusion criteria were: a past history of at least one unilateral ankle sprain which needed weight-bearing rest (Caulfried & Garrett, 2004; Dayakidis & Boudolos, 2006; Delahunt, Monaghan, & Caulfried, 2006, 2007); current episodes of ankle instability in the form of giving way, pain and/or subjective decrease of function; less than 24 points in the Spanish version of the Cumberland Ankle Instability Tool (CAIT-Sv) (Rodríguez-Fernández, 2013) to ensure the existence of CAI (De Noronha, Refshauge, Kilbreath, & Crosbie, 2007; Delahunt, O'Driscoll, & Moran, 2008). The CAIT-Sv is the Spanish cross-cultural adaptation of the Cumberland Ankle Instability Tool (CAIT). "
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    ABSTRACT: Free download until 18 fer, 2015 in,XMZM2EIs Objective To compare the effect of two manual therapy techniques, mobilization with movement (WB-MWM) and talocrural manipulation (HVLA), for the improvement of ankle dorsiflexion in people with chronic ankle instability (CAI) over 48 hours. Design randomized controlled clinical trial. Setting University research laboratory. Participants Fifty-two participants (mean±SD age, 20.7±3.4 years) with CAI were randomized to WB-MWM (n=18), HVLA (n=19) or placebo group (n=15). Main Outcome Measures weight-bearing ankle dorsiflexion measured with the weight-bearing lunge. Measurements were obtained prior to intervention, immediately after intervention, and ten minutes, 24 hours and 48 hours postintervention. Results There was a significant effect x time (F4,192=20.65; P<.001) and a significant time x group interactions (F8,192=6.34; P<.001). Post hoc analysis showed a significant increase of ankle dorsiflexion in both WB-MWM and HVLA groups with respect to the placebo group with no differences between both active treatment groups. Conclusion A single application of WB-MWM or HLVA manual technique improves ankle dorsiflexion in people with CAI, and the effects persist for at least two days. Both techniques have similar effectiveness for improving ankle dorsiflexion although WB-MWM demonstrated greater effect sizes.
    No preview · Article · Feb 2015 · Physical Therapy in Sport
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    • "However, the unique structure and function of the ankle region has been the subject of some studies of ankle neuromuscular control (Konradsen et al., 1997) because ankle sprain is one of the most common sports injuries (Dubin et al., 2011). In sports competitions and exercises, lateral and cutting movements are repeated frequently (Stacoff et al., 1996; Dayakidis & Boudolos, 2006). In addition, the prolongation of exercise and competition time may be a factor in the occurrence of this injury, as shown in some studies that have reported that ankle sprains occur more frequently in the final minutes of competitions (Gutierrez et al., 2007; Kofotolis et al., 2007). "

    Full-text · Article · Nov 2014 · Scandinavian Journal of Medicine and Science in Sports
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    • "soccer, rugby, and Australian football), impact forces can be caused by the collision of the foot with the ground (Nigg & Liu, 1999). The measurement and analysis of foot-strike impact forces has traditionally been performed in laboratory-based settings, using immobile and expensive devices, such as force plates (Besier et al., 2001; Cowley et al., 2006; Dayakidis & Boudolos, 2006). This situation may be of limited value as it is difficult to replicate in-field environmental conditions in a laboratory setting (Wixted & Billing, 2010; Zheng et al., 2008), which may result in an inadequate understanding of the field-based demands imposed on athletes. "
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    ABSTRACT: This study assessed the validity of a tri-axial accelerometer worn on the upper body to estimate peak forces during running and change-of-direction tasks. Seventeen participants completed four different running and change-of-direction tasks (0 degrees, 45 degrees, 90 degrees, and 180 degrees; five trials per condition). Peak crania-caudal and resultant acceleration was converted to force and compared against peak force plate ground reaction force (GRF) in two formats (raw and smoothed). The resultant smoothed (10 Hz) and crania-caudal raw (except 180 degrees) accelerometer values were not significantly different to resultant and vertical GRF for all running and change-of-direction tasks, respectively. Resultant accelerometer measures showed no to strong significant correlations (r = 0.00-0.76) and moderate to large measurement errors (coefficient of variation [CV] = 11.7-23.9%). Crania-caudal accelerometer measures showed small to moderate correlations (r = -0.26 to 0.39) and moderate to large measurement errors (CV = 15.0-20.6%). Accelerometers, within integrated micro-technology tracking devices and worn on the upper body, can provide a relative measure of peak impact force experienced during running and two change-of-direction tasks (45 degrees and 90 degrees) provided that resultant smoothed values are used.
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