Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 65
Filter
1.
BMJ Open ; 9(5): e025253, 2019 05 05.
Article in English | MEDLINE | ID: mdl-31061024

ABSTRACT

OBJECTIVES: In takotsubo syndrome, QTc prolongation is a measure of risk of potentially fatal arrhythmia. It is not known how this risk, or derangement of other markers, differs across the echo variants of takotsubo syndrome. Therefore, we sought to explore whether apical takotsubo syndrome differs from the variants of the syndrome in more ways than just regional wall motion pattern. As the region of affected myocardium is usually larger, we hypothesised that patients with the classic apical ballooning form of takotsubo syndrome would have more severe derangement of their markers. DESIGN: Observational study of patients gathered from a prospective database (2010-2018) and by retrospective review (2006-2009). SETTING: The sole tertiary hospital from a New Zealand region in which case clusters of takotsubo syndrome were precipitated by large earthquakes in 2010, 2011 and 2016. PARTICIPANTS: A total of 222 patients who met a modified version of the Mayo criteria for takotsubo syndrome were included. All patients had digitally archived echocardiograms that were over-read by a second echocardiologist blinded to the clinical report. PRIMARY OUTCOME MEASURES: Ejection fraction, peak troponin and QTc interval. RESULTS: Patients with the apical form were older (p=0.011), had a lower initial left ventricular ejection fraction (35% vs 44%, p<0.0001) and a higher peak high-sensitivity troponin I (hsTnI) (p=0.01) than those with variant forms. There was no difference in the electrical abnormalities between the variants (QTc interval, heart rate, PR interval, QRS duration or T-wave axis). There was also no correlation between any of peak hsTnI, peak QTc and ejection fraction. QTc interval increased on day 2 and peaked on day 3 before falling steeply (p<0.0001). CONCLUSIONS: The variants of takotsubo syndrome differ in more ways than just their echo pattern but do not differ in their electrical abnormalities. There is a dissociation between the structural and electrical abnormalities. QTc peaks on day 3 and then falls steeply.


Subject(s)
Earthquakes/statistics & numerical data , Echocardiography , Takotsubo Cardiomyopathy/physiopathology , Troponin I/blood , Aged , Analysis of Variance , Female , Humans , Male , Middle Aged , New Zealand/epidemiology , Retrospective Studies , Takotsubo Cardiomyopathy/blood , Takotsubo Cardiomyopathy/epidemiology , Tertiary Care Centers
3.
Echocardiography ; 34(1): 122-123, 2017 Jan.
Article in English | MEDLINE | ID: mdl-27804168

ABSTRACT

We document the fifth pattern of takotsubo cardiomyopathy, in which the mid-LV is hyperdynamic but the apex and base are akinetic or hypokinetic. This is a reverse mid-ventricular takotsubo. The patient is a 79-year-old woman admitted with chest pain and initially a normal EKG. Her troponin I rose to 5.4 µg/L (0.02-0.03 µg/L) and she developed QT prolongation and widespread T-wave inversion. Coronary angiography showed only very mild atheroma. Follow-up echocardiogram six weeks later showed normal left ventricular function.


Subject(s)
Echocardiography/methods , Heart Ventricles/physiopathology , Recovery of Function , Takotsubo Cardiomyopathy/diagnosis , Ventricular Dysfunction, Left/diagnosis , Ventricular Function, Left/physiology , Aged , Electrocardiography , Female , Follow-Up Studies , Heart Ventricles/diagnostic imaging , Humans , Takotsubo Cardiomyopathy/complications , Takotsubo Cardiomyopathy/physiopathology , Ventricular Dysfunction, Left/etiology , Ventricular Dysfunction, Left/physiopathology
4.
J Complement Integr Med ; 13(2): 181-7, 2016 Jun 01.
Article in English | MEDLINE | ID: mdl-27003242

ABSTRACT

BACKGROUND: This single-blinded, randomized controlled study investigated the effects of practicing Tai Chi on the postural control and cognitive performance of older women while dual tasking. METHODS: Community-dwelling older women (n=31) were recruited from community centers. They were randomized to Tai Chi group (n=15, 12-form Yang style Tai Chi training) or a control group (n=16, general interest classes) for 16 weeks. Balance was tested in single leg stance after stepping down from a step, with and without a concurrent auditory response task (auditory Stroop test). Balance was measured by total sway path and sway area of subject's center of pressure (COP). The reaction time and the correctness of the auditory Stroop test were also measured. RESULTS: Tai Chi subjects made fewer errors in auditory Stroop test under dual-task condition after Tai Chi training (p=0.01). They also showed significant decreases in the COP path (p<0.05) and the COP area (p<0.05) in their postural control after training in both single- and dual-task conditions. The subjects in the control group did not show any significant improvement in dual-task condition after the intervention. CONCLUSIONS: Tai Chi training improves the cognitive and postural control performance of older women when dual tasking.


Subject(s)
Cognition/physiology , Postural Balance/physiology , Tai Ji/methods , Task Performance and Analysis , Aged , Aged, 80 and over , Female , Humans , Single-Blind Method
5.
J Phys Ther Sci ; 28(12): 3444-3450, 2016 Dec.
Article in English | MEDLINE | ID: mdl-28174470

ABSTRACT

[Purpose] The evaluation of sitting balance is important for the prevention of falls in older adults, especially those who have a disability involving the lower extremities. However, no studies have been designed to assess a patient's dynamic sitting balance using a sequential protocol. The objective of this study was to investigate the psychometric properties of the sequential weight-shifting (SWS) test. [Subjects and Methods] Twenty-three older adults who were physically dependent with regard to ambulation were recruited by convenience sampling. In study 1, 10 participants performed the SWS test and repeated the procedure 1 week later. In study 2, 23 participants were assessed using the SWS test, forward and lateral reach tests in a sitting position, tests of shoulder flexor and hand grip strength, an eye-hand coordination test, mobility tests, and pulmonary function tests. The test-retest reliability of the SWS test and its correlations with the different physical dimensions were examined. [Results] The intraclass correlation coefficient (3,1) of the SWS test was 0.67. The results of the SWS test correlated significantly with forward reach in the sitting position, arm muscle strength, eye-hand coordination, mobility, and pulmonary function (all p<0.05). [Conclusion] The SWS test demonstrated satisfactory psychometric properties and can be considered a useful functional approach for the measurement of sitting balance.

6.
J Geriatr Phys Ther ; 39(4): 190-9, 2016.
Article in English | MEDLINE | ID: mdl-26288232

ABSTRACT

BACKGROUND AND PURPOSE: Recent dual-task studies suggest that Tai Chi practitioners displayed better control of standing posture and maintained a quicker response time of postural muscle activation during a stepping down activity. Whether this effect extends to voluntary balance control, specifically the limits of excursion of the center of pressure, remains to be examined. The purpose of this study was to evaluate the cognitive-motor interference pattern by examining the effects of a concurrently performed cognitive task on attention of voluntary balance control in older adults who are long-term practitioners of Tai Chi. METHODS: Ten older Tai Chi practitioners and 10 age-matched nonpractitioners performed a voluntary balance task that required them to shift their weight to reach a preset target in the forward and backward directions, with (single task, ST) and without (dual task, DT) a secondary cognitive task, which was the counting backward task. The counting backward task required the individual to compute and verbalize a series of arithmetic differences between a given pair of randomly generated numbers. The cognitive task was also performed independently (cognitive-ST). All trials were performed in a random order. Balance outcomes included reaction time, movement velocity, and maximal excursion of the center of pressure provided by the NeuroCom system. Cognitive outcome was the number of correct responses generated within the 8-second trial during the ST and DT conditions. Outcome variables were analyzed using a 2-factor, group by task, analysis of variance. DT costs for the variables were calculated as the relative difference between ST and DT conditions and were compared between the 2 groups using independent t tests. RESULTS: Tai Chi practitioners displayed shorter reaction times (P < .001) and faster movement velocities (P < .05) of their center of pressure than older nonpractitioners for both directions; however, no difference was found between the maximal excursions of the 2 groups. Cost analyses revealed that reaction time and cognitive costs were significantly lower in the Tai Chi practitioners for both forward and backward directions (P < .05); however, similar findings for movement velocity costs were significant only in the backward direction (P < .05). DISCUSSION AND CONCLUSIONS: Our results suggest that Tai Chi practitioners expended fewer motor and cognitive resources than older nonpractitioners during a fairly complex (dynamic) postural equilibrium task while performing a verbal working memory task. They exhibited lesser cognitive-motor interference and thus better allocation of attentional resources toward the voluntary balance control task. Given that dynamic balance is a crucial prerequisite for walking and dual-tasking ability is considered to be a significant predictor of falls in older adults, our results might point at the possible long-term benefits of Tai Chi practice to counteract age-related decline in dual-tasking ability. Findings present preliminary data for further investigation, especially related to potential benefits in fall prevention.


Subject(s)
Cognition/physiology , Movement/physiology , Postural Balance/physiology , Reaction Time/physiology , Tai Ji/methods , Aged , Cross-Sectional Studies , Female , Humans , Male , Middle Aged
7.
J Aging Phys Act ; 23(3): 361-8, 2015 Jul.
Article in English | MEDLINE | ID: mdl-25007862

ABSTRACT

This study quantified the effect of aging and the long-term practice of Tai Chi on upper limb movement control, indicated by performance outcome (temporal) and performance production (amplitude) measures, on a multiplanar stand-reaching (i.e., functional) task. Twelve Tai Chi practitioners (TCPs), 11 age-matched older nonpractitioners (ONPs), and 12 young subjects performed cued, flexion-reaching, and abduction-reaching tasks using a custom set-up. Surface EMG and acceleration data sampled from wireless sensors rendered performance outcome (reaction time, burst duration, time to peak, and movement time) and performance production (normalized EMG amplitude and peak acceleration) measures. Young subjects and TCPs demonstrated better performance outcome and performance production than ONPs. Relative-effect computations (i.e., the effect of Tai Chi expressed as a percentage of the effect of aging) showed that TCPs exhibited approximately 20-60% (flexion) and 20-100% (abduction) improvement in reaching task performance compared with ONPs. Tai Chi practitioners displayed better arm movement control than ONPs on a relatively challenging and functional stand-reaching task.


Subject(s)
Arm/physiology , Tai Ji , Adult , Age Factors , Aged , Cross-Sectional Studies , Electromyography , Female , Humans , Male , Reaction Time/physiology
8.
Disabil Rehabil ; 37(9): 790-4, 2015.
Article in English | MEDLINE | ID: mdl-25060039

ABSTRACT

PURPOSE: The purpose of this study was to examine the effects of 3 months of sitting Tai Chi training on the sitting balance control and eye-hand coordination of older adults subjects. METHODS: We randomly assigned 59 older adults from four residential care facilities to either sitting Tai Chi group or mobilizing exercises group as control. The sitting Tai Chi group underwent 3 months of training with a total of 36 sessions (1 hour/session, 3 sessions/week). The outcome measures included sitting balance tests (testing sequential weight shifting and forward reaching in a sitting position) and eye-hand coordination tests (reaction time, movement time and accuracy in finger pointing task). RESULTS: The Tai Chi practitioners showed significant improvement in their sequential weight shifting while sitting (improved by 29.0%, p ≤ 0.05) and in their maximum reaching distance from a sitting position (improved by 21.2%, p ≤ 0.05). No such improvements were found in the control group. In the eye-hand coordination test, the sitting Tai Chi practitioners had significant improvements in accuracy (improved by 17.3%, p ≤ 0.05). Also, no improvement was found in the control group. CONCLUSIONS: The results demonstrate 3-months of sitting Tai Chi training can improve sitting balance and accuracy in finger pointing task in the older adults. IMPLICATIONS FOR REHABILITATION: Traditional Tai Chi poses difficulties for older adults with poor standing balance. This pilot study showed that a 3 months sitting Tai Chi training can improve sitting balance and accuracy in the finger pointing task in the older adults. Sitting Tai Chi can be a therapy option for older adults with poor standing balance.


Subject(s)
Exercise Therapy/methods , Fingers/physiology , Motor Skills , Postural Balance/physiology , Tai Ji/methods , Aged , Aged, 80 and over , Aging , Female , Humans , Male , Movement/physiology , Pilot Projects , Reaction Time/physiology , Treatment Outcome
9.
J Electromyogr Kinesiol ; 24(5): 593-600, 2014 Oct.
Article in English | MEDLINE | ID: mdl-25026882

ABSTRACT

The purpose of this study was to establish the internal consistency and test-retest reliability of the electromyographic and accelerometric data sampled from the prime movers of the dominant arm during an antigravity, within-arm's length stand-reaching task without trunk restraint. Ten healthy young adults participated in two experimental sessions, approximately 7-10days apart. During each session, subjects performed 15 trials of both a flexion- and an abduction-reaching task. Surface EMG and acceleration using wireless sensors were sampled from the anterior and middle deltoid. Reliability was established using Cronbach's alpha, intraclass correlation coefficients (ICC 2, k) and standard error of measurements (SEM) for electromyographic reaction time, burst duration and normalized amplitude along with peak acceleration. Results indicated high degrees of inter-trial and test-retest reliability for flexion (Cronbach's α range=0.92-0.99; ICC range=0.82-0.92) as well as abduction (Cronbach's α range=0.94-0.99; ICC range=0.81-0.94) reaching. The SEM associated with response variables for flexion and abduction ranged from 1.55-3.26% and 3.33-3.95% of means, respectively. Findings from this study revealed that electromyographic and accelerometric data collected from prime movers of the arm during the relatively functional stand-reaching task were highly reproducible. Given its high reliability and portability, the proposed test could have applications in clinical and laboratory settings to quantify upper limb function.


Subject(s)
Arm/physiology , Electromyography/methods , Muscle, Skeletal/physiology , Range of Motion, Articular/physiology , Acceleration , Adult , Arm/physiopathology , Female , Humans , Male , Movement , Muscle Contraction , Reaction Time , Reproducibility of Results , Young Adult
10.
Clin Rehabil ; 28(2): 149-58, 2014 Feb.
Article in English | MEDLINE | ID: mdl-23904206

ABSTRACT

OBJECTIVES: To determine whether adding electrical stimulation of upper limb acupoints to conventional rehabilitation during acute stroke could produce greater and longer lasting motor improvements of the arm. DESIGN: Double-blind, randomized, placebo-controlled trial. SETTING: Acute stroke wards, followed by rehabilitation hospitals and subjects' residences. PARTICIPANTS: Seventy-three patients ≤ 46 hours post stroke onset with moderate to severe weakness in the arm contralateral to the side of stroke. INTERVENTION: All subjects received conventional rehabilitation. Twenty-nine received additional electrical stimulation, 21 received additional placebo-electrical stimulation and 23 received conventional rehabilitation only, as control. Electrical stimulation or placebo-electrical stimulation was applied to acupoints GB20, LI15, LI11, LI10 and LI4, 60 minutes a day, five days a week, for four weeks. MEASUREMENTS: Primary outcome measures were hand grip and pinch strength, with Action Research Arm Test (ARAT) as secondary outcome measure. These were assessed on the affected arm at recruitment, then 4 (W4), 12 (W12) and 24 weeks (W24) afterwards. RESULTS: Post-hoc analysis showed that the electrical stimulation group had greater improvements than the control group in hand grip (P = 0.015) and pinch strength (P = 0.007) at W4, with the gains maintained at W12 and W24. In contrast, the placebo-electrical stimulation group did not differ from either the control or the electrical stimulation group. Between-group improvements in ARAT scores from baseline to W24 (by 16.8 in control, 27.6 in placebo-electrical stimulation group and 26.3 in electrical stimulation group) were not significant. CONCLUSIONS: Adding four weeks of electrical stimulation during acute stroke appears to produce greater and longer lasting hand grip and pinch strength improvements than administering conventional rehabilitation alone.


Subject(s)
Acupuncture Points , Arm/physiopathology , Electric Stimulation Therapy/methods , Hand Strength/physiology , Paresis/rehabilitation , Stroke Rehabilitation , Aged , Double-Blind Method , Female , Hong Kong , Humans , Male , Outcome and Process Assessment, Health Care/methods , Paresis/etiology , Pinch Strength/physiology , Stroke/complications
11.
Eur J Appl Physiol ; 113(8): 1939-45, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23494549

ABSTRACT

To compare the performance of older experienced Tai Chi practitioners and healthy controls in dual-task versus single-task paradigms, namely stepping down with and without performing an auditory response task, a cross-sectional study was conducted in the Center for East-meets-West in Rehabilitation Sciences at The Hong Kong Polytechnic University, Hong Kong. Twenty-eight Tai Chi practitioners (73.6 ± 4.2 years) and 30 healthy control subjects (72.4 ± 6.1 years) were recruited. Participants were asked to step down from a 19-cm-high platform and maintain a single-leg stance for 10 s with and without a concurrent cognitive task. The cognitive task was an auditory Stroop test in which the participants were required to respond to different tones of voices regardless of their word meanings. Postural stability after stepping down under single- and dual-task paradigms, in terms of excursion of the subject's center of pressure (COP) and cognitive performance, was measured for comparison between the two groups. Our findings demonstrated significant between-group differences in more outcome measures during dual-task than single-task performance. Thus, the auditory Stroop test showed that Tai Chi practitioners achieved not only significantly less error rate in single-task, but also significantly faster reaction time in dual-task, when compared with healthy controls similar in age and other relevant demographics. Similarly, the stepping-down task showed that Tai Chi practitioners not only displayed significantly less COP sway area in single-task, but also significantly less COP sway path than healthy controls in dual-task. These results showed that Tai Chi practitioners achieved better postural stability after stepping down as well as better performance in auditory response task than healthy controls. The improved performance that was magnified by dual motor-cognitive task performance may point to the benefits of Tai Chi being a mind-and-body exercise.


Subject(s)
Attention , Postural Balance , Psychomotor Performance , Tai Ji , Acoustic Stimulation , Aged , Auditory Perception , Cross-Sectional Studies , Exercise Test , Female , Humans , Male , Stroop Test
12.
Article in English | MEDLINE | ID: mdl-23476699

ABSTRACT

Background. This cross-sectional study examined the effect of aging on performing finger-pointing tasks involving choices and whether experienced older Tai Chi practitioners perform better than healthy older controls in such tasks. Methods. Thirty students and 30 healthy older controls were compared with 31 Tai Chi practitioners. All the subjects performed a rapid index finger-pointing task. The visual signal appeared randomly under 3 conditions: (1) to touch a black ball as quickly and as accurately as possible, (2) not to touch a white ball, (3) to touch only the white ball when a black and a white ball appeared simultaneously. Reaction time (RT) of anterior deltoid electromyogram, movement time (MT) from electromyogram onset to touching of the target, end-point accuracy from the center of the target, and the number of wrong movements were recorded. Results. Young students displayed significantly faster RT and MT, achieving significantly greater end-point accuracy and fewer wrong movements than older controls. Older Tai Chi practitioners had significantly faster MT than older controls. Conclusion. Finger-pointing tasks with a choice paradigm became slower and less accurate with age. Positive findings suggest that Tai Chi may slow down the aging effect on eye-hand coordination tasks involving choices that require more cognitive progressing.

13.
Eur J Prev Cardiol ; 20(2): 238-45, 2013 Apr.
Article in English | MEDLINE | ID: mdl-22345677

ABSTRACT

BACKGROUND: Exercise which can improve muscle strength while not compromising arterial compliance is especially needed for older adults. Tai Chi practitioners are known to have better than average arterial compliance and muscle strength. This study was designed to establish a cause and effect relationship between Tai Chi training and both increased arterial compliance and increased muscle strength. DESIGN: In a single blind randomized clinical trial, 31 elderly women were randomly assigned to receive either Tai Chi training or an education programme, three sessions per week for 16 weeks. RESULTS: After training, the subjects in the Tai Chi group showed significant improvements in arterial compliance and eccentric knee extensor strength. The subjects in the control group showed no significant improvement. CONCLUSION: Practising Tai Chi can improve the eccentric knee extensor strength and arterial compliance of elderly women. Tai Chi maybe a good exercise choice to improve the cardiovascular health and muscle strength of the elderly.


Subject(s)
Muscle Strength , Muscle, Skeletal/physiology , Radial Artery/physiology , Tai Ji , Vascular Stiffness , Age Factors , Aged , Aged, 80 and over , Chi-Square Distribution , Compliance , Female , Hong Kong , Humans , Middle Aged , Muscle Strength Dynamometer , Predictive Value of Tests , Pulse Wave Analysis , Sex Factors , Single-Blind Method , Time Factors , Treatment Outcome
14.
Eur J Prev Cardiol ; 20(4): 613-9, 2013 Aug.
Article in English | MEDLINE | ID: mdl-22492864

ABSTRACT

BACKGROUND: Aerobic exercise can alleviate the declines in arterial compliance common in older adults. However, when combined with strength training, aerobic exercise may not reduce arterial compliance. Tai Chi practice has been found to improve muscle strength and cardiopulmonary function in older subjects, but whether or not it improves arterial compliance is not known. The primary aim of this study was to investigate whether Tai Chi practitioners have better arterial compliance and muscle strength. DESIGN: Twenty-nine older Tai Chi practitioners (73.7 ± 4.5 years) and 36 healthy control subjects (71.4 ± 6.6 years) participated in this cross-sectional study. METHODS: The participants were independent in their daily living activities. They were screened for apparent cardiovascular disease and underwent arterial compliance testing and isokinetic knee muscle strength testing at 30°/s. RESULTS: Tai Chi practitioners showed significantly better haemodynamic parameters than the controls as indexed by larger and small artery compliance. They also demonstrated greater eccentric muscle strength in both knee extensors and flexors. CONCLUSION: The findings of better muscle strength without jeopardizing arterial compliance suggests that Tai Chi could be a suitable exercise for older persons to improve both cardiovascular function and muscle strength.


Subject(s)
Arteries/physiology , Knee Joint/physiology , Muscle Strength , Tai Ji , Vascular Stiffness , Age Factors , Aged , Case-Control Studies , Chi-Square Distribution , Compliance , Cross-Sectional Studies , Female , Hemodynamics , Humans , Male , Multivariate Analysis , Muscle Strength Dynamometer , Pulse Wave Analysis
15.
J Altern Complement Med ; 19(2): 178-81, 2013 Feb.
Article in English | MEDLINE | ID: mdl-22775329

ABSTRACT

OBJECTIVES: Application of transcutaneous electrical nerve stimulation over acupuncture points (Acu-TENS) is a noninvasive intervention that has recently been shown to alleviate dyspnea in patients with stable chronic obstructive pulmonary disease (COPD). This case report aims to explore the role of Acu-TENS in patients diagnosed with COPD during the acute exacerbation. STUDY DESIGN: The study design was a case report. SETTING: The study was conducted in an inpatient setting. SUBJECT: The subject was a 74-year-old man admitted to the hospital due to acute exacerbation of COPD (AECOPD). INTERVENTION: Treatment consisted of application of TENS on EX-B1 (Dingchuan) for 45 minutes. OUTCOME MEASURES: Oxygen saturation, heart rate, and dyspnea score were measured before, immediately after, and 45 minutes after Acu-TENS intervention. Other than the physiologic measures, 10 mL of venous blood was taken from the cubital vein for assessment of ß-endorphin level, white blood cell count, tumor necrosis factor-α (TNF-α), and C-reactive protein (CRP) level before and immediately postintervention. RESULTS: Postintervention, improved oxygen saturation, and reduction in heart rate and dyspneic sensation were observed accompanied by a raised blood ß-endorphin level but the level of white blood cell count, TNF-α, and CRP remain unchanged. CONCLUSIONS: Application of 45 minutes Acu-TENS appeared to alleviate symptoms in a patient with AECOPD. The role of adjunctive Acu-TENS therapy during acute exacerbation warrants further investigation.


Subject(s)
Acupuncture Points , Dyspnea/prevention & control , Heart Rate , Oxygen/metabolism , Pulmonary Disease, Chronic Obstructive/therapy , Transcutaneous Electric Nerve Stimulation , beta-Endorphin/blood , Acute Disease , Aged , C-Reactive Protein/metabolism , Humans , Leukocyte Count , Male , Outcome Assessment, Health Care , Pulmonary Disease, Chronic Obstructive/blood , Pulmonary Disease, Chronic Obstructive/physiopathology , Tumor Necrosis Factor-alpha/blood
16.
Phys Ther ; 93(4): 492-503, 2013 Apr.
Article in English | MEDLINE | ID: mdl-23139427

ABSTRACT

BACKGROUND: Previous studies have shown that people with Parkinson disease (PD) have difficulty performing the sit-to-stand task because of mobility and stability-related impairments. Despite its importance, literature on the quantification of dynamic stability control in people with PD during this task is limited. OBJECTIVE: The study objective was to examine differences in dynamic stability control between people with PD and people who were healthy and the extent to which externally cued training could improve such control during the sit-to-stand task in people with PD. DESIGN: This was a quasi-experimental controlled trial. METHODS: The performance of 21 people with PD was compared with that of 12 older adults who dwelled in the community. People with PD were randomly assigned to 2 groups: a group that did not receive training and a group that received audiovisually cued training (3 times per week for 4 weeks) for speeding up performance on the sit-to-stand task. Outcome measures recorded at baseline and after 4 weeks included center-of-mass position, center-of-mass velocity, and stability against either backward or forward balance loss (backward or forward stability) at seat-off and movement termination. RESULTS: Compared with people who were healthy, people with PD had greater backward stability resulting from a more anterior center-of-mass position at seat-off. This feature, combined with decreased forward stability at movement termination, increased their risk of forward balance loss at movement termination. After training, people with PD achieved greater backward stability through increased forward center-of-mass velocity at seat-off and reduced the likelihood of forward balance loss at movement termination through a posterior shift in the center-of-mass position. LIMITATIONS: The study applied stability limits derived from adults who were healthy to people with PD, and the suggested impact on the risk of balance loss and falling is based on these theoretical stability limits. CONCLUSIONS: For people with PD, postural stability against backward balance loss at task initiation was increased at the expense of possible forward balance loss at task termination. Task-specific training with preparatory audiovisual cues resulted in improved overall dynamic stability against both forward and backward balance loss.


Subject(s)
Exercise Therapy/methods , Parkinson Disease/rehabilitation , Postural Balance/physiology , Postural Balance/radiation effects , Posture/physiology , Aged , Aged, 80 and over , Audiovisual Aids , Biomechanical Phenomena , Cues , Female , Humans , Male , Middle Aged , Parkinson Disease/physiopathology
17.
Arch Phys Med Rehabil ; 93(6): 1046-51, 2012 Jun.
Article in English | MEDLINE | ID: mdl-22440486

ABSTRACT

OBJECTIVES: (1) To determine the relationships of ankle dorsiflexor strength, ankle plantarflexor strength, and spasticity of the ankle plantarflexors with walking endurance; (2) to determine whether affected ankle dorsiflexor strength makes an independent contribution to walking endurance; and (3) to quantify its relative contribution to the walking endurance of people with spastic hemiplegia after stroke. DESIGN: A cross-sectional study. SETTING: University-based rehabilitation center. PARTICIPANTS: Subjects (N=62) with spastic hemiplegia. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Walking endurance was measured by the distance covered in the six-minute walk test (6MWT). Ankle dorsiflexor and plantarflexor strength were measured using a load-cell mounted on a custom-built foot support. Plantarflexor spasticity was measured using the Composite Spasticity Scale. RESULTS: The six-minute walk distances showed stronger positive correlation with affected dorsiflexor strength (r=.793, P≤.000) when compared with affected plantarflexor strength (r=.349, P=.005). Results of the regression model showed that after adjusting for basic demographic and stroke-related impairments, affected ankle dorsiflexor strength remained independently associated with six-minute walk distance, accounting for 48.8% of the variance. CONCLUSIONS: This is the first study, to our knowledge, to document the importance of ankle dorsiflexor strength as an independent determinant of walking endurance in stroke survivors with spastic plantarflexors. Our findings suggest that stroke rehabilitation programs aiming to improve walking endurance should include strengthening exercises for the ankle dorsiflexors.


Subject(s)
Ankle Joint/physiopathology , Exercise Test/methods , Hemiplegia/rehabilitation , Physical Endurance/physiology , Range of Motion, Articular/physiology , Stroke Rehabilitation , Aged , Cross-Sectional Studies , Female , Follow-Up Studies , Gait Disorders, Neurologic/physiopathology , Gait Disorders, Neurologic/rehabilitation , Hemiplegia/etiology , Hemiplegia/physiopathology , Humans , Linear Models , Male , Middle Aged , Multivariate Analysis , Muscle Strength/physiology , Recovery of Function/physiology , Rehabilitation Centers , Stroke/complications , Stroke/diagnosis , Time Factors , Walking/physiology
18.
Eur J Appl Physiol ; 112(7): 2663-9, 2012 Jul.
Article in English | MEDLINE | ID: mdl-22105705

ABSTRACT

To investigate whether elderly Tai Chi practitioners are better able to descend a step while performing a concurrent mental task than non-practitioners. The design includes cross-sectional study. The setting includes university-based rehabilitation center. The subjects were 16 young women, 29 elderly women, and 31 elderly women who had been practicing Tai Chi regularly for at least half a year. Pre-landing muscle response latencies in their tibialis anterior (TA) and medial gastrocnemius (MG) muscles were measured during stepping down (single task) and stepping down while performing a concurrent mental activity (dual tasking). The non-practitioners had earlier onset of muscle activity in the TA in preparation for landing than the other subjects. The response latency of the Tai Chi practitioners was not significantly different from that of the young controls. When the cognitive task was added, the pre-landing response in the TA was significantly altered in both elderly groups. Response was significantly delayed among the non-practitioners, but significantly earlier among the Tai Chi subjects. The average change in response latency was significantly greater in the non-Tai Chi group compared with the young subjects and the Tai Chi practitioners (p = 0.006). Such findings suggest that practicing Tai Chi helps the elderly maintain the same strategy as much as younger subjects during stepping down. Tai Chi practitioners seem to have a greater capacity to shift attention between mental and physical tasks than other elderly women.


Subject(s)
Attention/physiology , Cognition/physiology , Movement/physiology , Muscle Contraction/physiology , Muscle, Skeletal/physiology , Psychomotor Performance/physiology , Tai Ji , Aged , Female , Humans , Leg/physiology , Male , Reaction Time/physiology
19.
Echocardiography ; 29(2): E26-7, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22067059

ABSTRACT

We present the case of a Caucasian woman who survived two major earthquakes, presenting on each occasion with stress cardiomyopathy, but with a different pattern of regional wall motion abnormality on the second occasion. The first Christchurch earthquake struck on September 4, 2010. At 7.1 on the Richter scale, it was larger than the major Haiti quake, but miraculously there were no direct fatalities. In the week following, eight women meeting modified Mayo criteria for stress cardiomyopathy presented to Christchurch Hospital. The second Christchurch earthquake was on February 22, 2011. It measured 6.4 on the Richter scale and caused 180 direct fatalities. In the week following this earthquake, 24 women were admitted with stress cardiomyopathy. One patient presented after both earthquakes. This 76-year-old woman first presented on September 4 with 10 hours of chest pain. Electrocardiogram showed inferolateral deep T-wave inversion and QT prolongation. TnI peaked at 0.81 µg/L. Coronary angiography demonstrated diffuse atheroma with a moderate mid LAD lesion that was stented at the time. Echocardiography showed a classic takotsubo pattern. Her follow-up echocardiogram on September 28 was normal and she was completely well at that point. However, during the second earthquake of February 22, she again developed chest pain and shortness of breath. TnI peaked at 1.3 µg/L. Echocardiogram showed a midwall variant takotsubo with apical sparing. She was discharged from hospital on the 25th, planning to leave Christchurch for a new home in another city, but returned for follow-up echocardiogram on July 27. This was normal.


Subject(s)
Earthquakes , Takotsubo Cardiomyopathy/diagnostic imaging , Aged , Coronary Angiography/methods , Electrocardiography , Female , Follow-Up Studies , Humans , Plaque, Atherosclerotic/diagnostic imaging , Recurrence
SELECTION OF CITATIONS
SEARCH DETAIL
...