Abstract:
:In this paper we propose a simple model to predict the effect of linear time normalization to reduce variability in human movement analysis. This model is based on analysis of the correlation between timing variables and total movement duration. We obtain a simple expression to predict the variation coefficient (CV) of the normalized variable as a function of the CV of the original one, the CV of the total movement duration and the correlation between both variables. Depending on the correlation coefficient, R, very different results can be obtained after normalization. If R is positive and high, the linear normalization process effectively decreases variability. However, an increase of variability of the normalized variable can be expected if R decreases. This model explains why linear normalization does not always reduce variability. The model is applied to an example of sit-to-stand movement in order to show its effectiveness and to illustrate the close relationship between the correlation coefficient and the suitability of linear time-scale normalization.
journal_name
Gait Posturejournal_title
Gait & postureauthors
Page A,Epifanio Idoi
10.1016/j.gaitpost.2006.01.006subject
Has Abstractpub_date
2007-01-01 00:00:00pages
153-6issue
1eissn
0966-6362issn
1879-2219pii
S0966-6362(06)00031-2journal_volume
25pub_type
杂志文章相关文献
GAIT & POSTURE文献大全abstract::This study has analysed the recovery from an induced stumble whilst walking on a treadmill. Four stumbling conditions were tested; at early swing with short and long durations and at mid and late swing with short duration. The experiment set-up, including the possibility of being stumbled, did not alter the normal gai...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/s0966-6362(02)00160-1
更新日期:2003-08-01 00:00:00
abstract::Most falls in older people are due to loss of balance during everyday locomotion, e.g., when initiating walking from sitting; sit-to-walk (STW). It has been considered that the broader stride width in walking that is seen in many people with fear of falling (FoF) does not increase stability, but could be predictive of...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2010.01.018
更新日期:2010-04-01 00:00:00
abstract::In many cases knee osteoarthritis leads to total knee replacement surgery (TKR) even if the lateral compartment is not involved. More recently, a bicompartmental knee replacement system (BKR) (Journey Deuce, Smith & Nephew Inc., Memphis, TN, USA) has been developed that only replaces the medial tibiofemoral and the pa...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2012.04.008
更新日期:2012-07-01 00:00:00
abstract:BACKGROUND:Postural instability is a prevalent and deleterious consequence of aging. It is unclear how the occurrence of chronic pain augments balance issues as age progresses. RESEARCH QUESTION:We investigated how postural stability is influenced by aging and chronic pain. METHODS:Fifty-five participants with and wi...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2019.04.019
更新日期:2019-06-01 00:00:00
abstract::With increasing numbers of adults owning a cell phone, walking while texting has become common in daily life. Previous research has shown that walking is not entirely automated and when challenged with a secondary task, normal walking patterns are disrupted. This study investigated the effects of texting on the walkin...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2017.10.011
更新日期:2018-01-01 00:00:00
abstract::The calf muscle-tendon lengths in children exhibiting equinus gait in two clinical populations, cerebral palsy (CP) and idiopathic toe walking (ITW), were examined to compare the effects of diagnosis and two different surgical procedures, Tendo-Achilles lengthening (TAL) versus Vulpius procedure (VP) gastrocnemius rec...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2009.01.001
更新日期:2009-06-01 00:00:00
abstract::This study investigates whether aging has an influence on the dynamics of the fluctuations of the displacement of the center of pressure (COP), during quiet standing. Two groups of healthy subjects were compared (11 young and 12 elderly) for two visual feedback conditions (eyes open and eyes closed). The data were ana...
journal_title:Gait & posture
pub_type: 临床试验,杂志文章
doi:10.1016/j.gaitpost.2009.05.005
更新日期:2009-08-01 00:00:00
abstract::Distal hamstring lengthening (DHL) is a commonly performed procedure in flexed knee gait. However, the necessity of this procedure has been challenged due to the concerns on adverse effects in long-term follow-up. This retrospective study was undertaken to investigate the long-term outcome of single event multilevel s...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2012.09.011
更新日期:2013-04-01 00:00:00
abstract::The objective was to analyze the compensatory effect of the pelvis and lower extremities on sagittal spinal malalignment in patients with pelvic incidence (PI) and lumbar lordosis (LL) mismatch. A series of parameters including PI, LL, PI-LL, thoracic kyphosis (TK), pelvic tilt (PT), sacral slope (SS), knee flexion an...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2017.04.041
更新日期:2017-07-01 00:00:00
abstract:INTRODUCTION:The gait pattern in Parkinson´s disease (PD) subjects is characterized by a specific deficit of the internal regulation of the stride length (SL), while the control of the cadence (Cad) remains intact. The purpose of the present study was to evaluate the reliability of the stride length-cadence relationshi...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2019.05.009
更新日期:2019-06-01 00:00:00
abstract::This study had two aims. Firstly, to characterise the temporal-spatial and ground reaction impulse adjustments, compared to straight gait, required to complete step turns to the left and to the right and secondly, to assess if the turns were asymmetrical. Seven participants were instructed to perform 90 degrees step t...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2008.12.015
更新日期:2009-06-01 00:00:00
abstract:BACKGROUND:Running with body weight support (BWS) has been used for physical fitness enhancement. Nevertheless, gait mechanics of running with BWS is not fully understood. RESEARCH QUESTION:We investigated influence of stride frequency manipulation on muscle activity during running at various BWS conditions. METHODS:...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2018.02.010
更新日期:2018-03-01 00:00:00
abstract::Falls during stair descent are a serious problem and can lead to accidental death. Inappropriate foot placement on, and clearance over, steps have been identified as causes for falls on stairs. This study investigated a new method for measuring placement and clearance during stair descent in 10 healthy young subjects....
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2010.12.004
更新日期:2011-03-01 00:00:00
abstract:BACKGROUND:Evidence of neuroplasticity after joint injury has suggested that individuals with chronic ankle instability (CAI) may have degraded movement when facing cognitive demand. To date, research into these effects have been limited to static balance models, and typically only incorporate a single type of cognitiv...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2020.03.019
更新日期:2020-06-01 00:00:00
abstract:BACKGROUND:The altered coordination variability was related to anterior cruciate ligament (ACL) re-injury after ACL reconstruction (ACL-R). As motor performance is affected by the cognitive loading, understanding the interaction of cognition and coordination variability is crucial for addressing secondary injury preven...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2020.10.028
更新日期:2020-11-28 00:00:00
abstract::Many Parkinson's disease (PD) patients show asymmetries in balance control during quiet stance and in response to perturbations (i.e., reactive balance control) in the sagittal plane. In addition, PD patients show a reduced ability to anticipate to self-induced disturbances, but it is not clear whether these anticipat...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2015.08.014
更新日期:2016-01-01 00:00:00
abstract::This study examined the adaptation of postural responses in transtibial amputees during both perturbed and volitional dynamic balance tasks during a five-month period following discharge from inpatient rehabilitation. Seven unilateral transtibial amputees performed the sensory organisation test (SOT) and the limits of...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2012.07.023
更新日期:2013-03-01 00:00:00
abstract::Over 230,000 new cases of breast cancer are expected to be diagnosed in the United States in 2015. Taxane-based chemotherapy is often an effective treatment, but can also cause adverse symptoms in patients due to neurotoxicity. These side effects can impair postural control in patients; however, this instability has s...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2016.06.011
更新日期:2016-07-01 00:00:00
abstract::Persistent post-concussive symptoms are reported by 10-15% of individuals who suffer mild traumatic brain injury (mTBI), but their basis is often uncertain. One such symptom is disequilibrium, a sensation of impaired balance during standing and walking. The hypothesis for this study was that this subjective symptom is...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2015.08.012
更新日期:2015-10-01 00:00:00
abstract::Diabetic peripheral neuropathy (DPN) is a common complication leading to foot ulceration and amputation. Several kinematic, kinetic and plantar pressure measures have been proposed for DPN detection, however findings have been inconsistent. In this work, we present new shape features that capture variations in the pla...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2016.11.006
更新日期:2017-01-01 00:00:00
abstract::Old adults execute single-joint voluntary movements with heightened antagonist muscle coactivation and altered timing between agonist and antagonist muscles. It is less clear if old adults adopt similar strategies during the most common form of activity of daily living, gait, and if age and gait velocity interact. We ...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2008.12.007
更新日期:2009-06-01 00:00:00
abstract::Electromyography (EMG) is an important parameter in Clinical Gait Analysis (CGA), and is generally interpreted with timing of activation. EMG amplitude comparisons between individuals, muscles or days need normalization. There is no consensus on existing methods. The gold standard, maximum voluntary isometric contract...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2017.10.026
更新日期:2018-02-01 00:00:00
abstract::Postural adjustments following mechanical perturbations have been studied in healthy seated humans. However, little is known on the minimal intensity that should be used to provoke a reaction. This knowledge could be essential to assess seated postural deficits in some pathological populations. The goal of the present...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2009.06.007
更新日期:2009-11-01 00:00:00
abstract:INTRODUCTION:Spinal stenosis is defined as neurogenic claudication due to narrowing of the spinal canal lumen diameter. As the disease progresses, ambulation and gait may be impaired. Self-report measures are routinely used in the clinical setting to capture data related to lumbar pain symptoms, function and perceived ...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2013.05.010
更新日期:2013-09-01 00:00:00
abstract::We investigated the effect of stride frequency (SF) on metabolic costs and rating of perceived exertion (RPE) during walking in water and on dry land. Eleven male subjects walked on a treadmill on dry land and on an underwater treadmill at their preferred SF (PSF) and walked at an SF which was lower and higher than th...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2012.12.010
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND:Existing analytical approaches used to measure free-living stepping cadence (steps per minute; spm) characterize stepping two-ways: 1) 60 s epochs without considering time spent stepping during the epoch (step accumulation; SA), or 2) a bout-based analysis that considers both number of steps and time spent s...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2020.04.014
更新日期:2020-06-01 00:00:00
abstract:BACKGROUND:Dizziness and imbalance are very common complaints in clinical practice. One of the challenges is to evaluate the 'real' risk of falls. Two tools are available: the patient's self-report and the measure of the patient's balance. We evaluated the relationship between these methods using the Dizziness Handicap...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2017.10.019
更新日期:2018-01-01 00:00:00
abstract::Thirty self-ambulatory children with mid-lumbar to low-sacral myelomeningocele who walked without aids and 21 control children were evaluated by three-dimensional gait analysis. Characteristic kinematic patterns and parameters in the trunk, pelvis, hip, knee and ankle were analyzed with respect to groups with successi...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/s0966-6362(03)00011-0
更新日期:2003-12-01 00:00:00
abstract:INTRODUCTION:Adolescent idiopathic scoliosis (AIS) is the most common type of three-dimensional spinal deformity. Identifying the postural adjustments or changes for different phases and events is needed for developing programs to improve the AIS gait, but such information has been limited. The current study aimed to f...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2018.12.024
更新日期:2019-02-01 00:00:00
abstract::Post-stroke hemiparetic subjects walk with asymmetrical step lengths that are highly variable between subjects and may be indicative of the underlying impairments and compensatory mechanisms used. The goal of this study was to determine if post-stroke hemiparetic subjects grouped by step length asymmetry have similar ...
journal_title:Gait & posture
pub_type: 杂志文章
doi:10.1016/j.gaitpost.2011.01.004
更新日期:2011-04-01 00:00:00