Exercise as medicine in Parkinson's disease.

Parkinson's disease (PD) is an incurable and progressive neurological disorder leading to deleterious motor and non-motor consequences. Presently, no pharmacological agents can prevent PD evolution or progression, while pharmacological symptomatic treatments have limited effects in certain domains and cause side effects. Identification of interventions that prevent, slow, halt or mitigate the disease is therefore pivotal. Exercise is safe and represents a cornerstone in PD rehabilitation, but exercise may have even more fundamental benefits that could change clinical practice. In PD, the existing knowledge base supports exercise as (1) a protective lifestyle factor preventing the disease (ie, primary prevention), (2) a potential disease-modifying therapy (ie, secondary prevention) and (3) an effective symptomatic treatment (ie, tertiary prevention). Based on current evidence, a paradigm shift is proposed, stating that exercise should be individually prescribed as medicine to persons with PD at an early disease stage, alongside conventional medical treatment.

Feasibility of a novel eHealth intervention for Parkinson's disease targeting motor-cognitive function in the home.

BACKGROUND: Parkinson's disease (PD) drastically affects motor and cognitive function, but evidence shows that motor-cognitive training improves disease symptoms. Motor-cognitive training in the home is scarcely investigated and eHealth methods can provide continual support for PD self-management. Feasibility testing is however required. OBJECTIVE: To assess the feasibility (i) Recruitment capability (ii) Acceptability and Suitability (iii) Demand and Safety of a home-based motor-cognitive eHealth exercise intervention in PD. METHODS: The 10-week intervention was delivered using the ExorLive® application and exercises were individually adapted and systematically progressed and targeted functional strength, cardiovascular fitness, flexibility, and motor-cognitive function. People with mild-to moderate PD were assessed before and after the intervention regarding; gait performance in single and dual-task conditions; functional mobility; dual-task performance; balance performance; physical activity level; health related quality of life and perceived balance confidence and walking ability; global cognition and executive function. Feasibility outcomes were continuously measured using a home-exercise diary and contact with a physiotherapist. Changes from pre- and post-intervention are reported descriptively. RESULTS: Fifteen participants (mean age 68.5 years) commenced and 14 completed the 10-week intervention. In relation to intervention Acceptability, 64% of the motor sessions and 52% of motor-cognitive sessions were rated as "enjoyable". Concerning Suitability, the average level of exertion (Borg RPE scale) was light (11-12). Adherence was high, with 86% of all (420) sessions reported as completed. No falls or other adverse events occurred in conjunction with the intervention. CONCLUSIONS: This motor-cognitive eHealth home exercise intervention for PD was safe and feasible in terms of Recruitment capability, Acceptability, Safety and Demand. The intensity of physical challenge needs to be increased before testing in an efficacy trial. TRIAL REGISTRATION: This trial is registered at Clinicaltrials.gov (NCT05027620).

Predictors of Sustained Physical Activity During the COVID-19 Pandemic in People With Parkinson Disease in Sweden.

BACKGROUND AND PURPOSE: During the first wave of the COVID-19 pandemic, people with Parkinson disease (PwPD) reported deterioration in health and physical activity. The aim of this study was to describe 1-year changes in physical activity and perceived health in PwPD during the COVID-19 pandemic and to identify predictors of sustained physical activity. METHODS: This study compared perceived health and sensor-derived physical activity (Actigraph GT3x) in PwPD between the first (June to July 2020) and third waves (June to July 2021) of the pandemic. Multiple logistic regression analyses were used to predict sustained physical activity across the study period using personal factors, disease severity, and functioning as independent variables. RESULTS: Sixty-three PwPD (mean age 71.0 years, 41% females) completed both baseline and 1-year follow-up (26 lost to follow-up). PwPD showed a decrease in average number of steps per day (Δ415 steps, P = 0.048), moderate-to-vigorous-physical activity (Δ7 minutes, P = 0.007) and increase in sedentary time (Δ36 minutes, P <.001) between baseline and 1-year follow-up. While self-perceived walking impairments and depressive symptoms increased significantly, balance confidence decreased between baseline and 1-year follow-up, no significant changes occurred for self-rated health, quality of life, or anxiety. Significant predictors of sustained physical activity levels were 15 years or more of education (odds ratio [OR] = 7.38, P = 0.013) and higher perceived walking ability (OR = 0.18, P = 0.041). DISCUSSION AND CONCLUSION: Among PwPD with mild to moderate disease severity living in Sweden, factors associated with reduced physical activity levels during the COVID-19 pandemic included older age, lower education levels, and greater perceived walking difficulties.

Design of the STEPS trial: a phase II randomized controlled trial evaluating eHealth-supported motor-cognitive home training for Parkinson's disease.

BACKGROUND: Electronic health (eHealth) technology offers the potential to support and motivate physical activity for symptom management in Parkinson's disease (PD). It is also recommended that motor exercise in PD be complemented with cognitive training aimed at attentional or executive functions. This paper describes the protocol for a double-blind randomized controlled trial to evaluate the effects of motor-cognitive training in the home environment, supported by eHealth. METHODS/DESIGN: The Support for home Training using Ehealth in Parkinsons diseaSe (STEPS) is a double-blind single center randomized controlled trial. Two parallel groups will include in total 120 participants with mild to moderate PD who will receive either (i) the intervention (a progressive 10-week individualized motor-cognitive eHealth training with cognitive behavioral elements to increase physical activity levels) or (ii) an active control group (an individualized 10-week paper-based home exercise program). The active control group will not receive motor-cognitive exercises or cognitive behavioral approaches to increase physical activity level. The primary outcome is walking capacity assessed by the six-minute walk test (6MWT). Secondary outcomes will include gait performance during single and dual task conditions, gait speed, functional mobility and lower limb strength, balance, physical activity behavior and a range of patient reported outcome measures relevant in PD. DISCUSSION: The STEPS trial will answer the question whether 10 weeks of eHealth supported motor-cognitive exercise in the home environment can improve walking capacity in PD when compared to a standard paper exercise program. Findings from this study will also strengthen the evidence concerning the efficacy of PD-specific eHealth interventions with a view meeting future health care demands by addressing issues of inaccessibility to specialized neurological rehabilitation in PD. TRIAL REGISTRATION: ClinicalTrials.gov August 2022, NCT05510739.

Mobile health technology, exercise adherence and optimal nutrition post rehabilitation among people with Parkinson's Disease (mHEXANUT) - a randomized controlled trial protocol.

BACKGROUND: Although it is well known that regular physical activity and exercise, as well as maintaining adequate nutritional status is important to delaying symptom development and maintaining physical capacity and function in people with Parkinson's Disease (PD), many are unable to follow self-management recommendations. Active interventions have shown short-term effects, but there is a need for interventions that facilitate self-management over the course of the disease. Until now, no studies have combined exercise and nutritional interventions with an individual self-management approach in PD. Thus, we aim to examine the effect of a six-month mobile health technology(m-health)-based follow-up programme, focusing on self-management in exercise and nutrition, after an in-service interdisciplinary rehabilitation programme. METHODS: A single-blinded, two-group randomised controlled trial. Participants are Adults aged 40 or older, with idiopathic PD, Hoehn and Yahr 1-3, living at home. The intervention group receives a monthly, individualized, digital conversation with a PT, combined with use of an activity tracker. People at nutritional risk get additional digital-follow-up from a nutritional specialist. The control group receives usual care. The primary outcome is physical capacity, measured by 6-min walk test (6MWT). Secondary outcomes are nutritional status, Health related quality of life (HRQOL), physical function and exercise adherence. All measurements are performed at baseline, after 3 months and after 6 months. Sample size, based on primary outcome, is set at 100 participants randomized into the two arms, including an estimated 20% drop out. DISCUSSION: The increasing prevalence of PD globally makes it even more important to develop evidence-based interventions that can increase motivation to stay active, promote adequate nutritional status and improve self-management in people with PD. The individually tailored digital follow-up programme, based on evidence-based practice, has the potential to promote evidence-based decision-making and to empower people with PD to implement exercise and optimal nutrition in their daily lives and, hopefully, increase adherence to exercise and nutritional recommendations. TRIAL REGISTRATION: ClinicalTrials.gov (NCT04945876). First registration 01.03.2021.

Muscle Strength and Power in People With Parkinson Disease: A Systematic Review and Meta-analysis.

BACKGROUND AND PURPOSE: No studies have synthesized the literature regarding mechanical muscle function (ie, strength, power, rate of force development [RFD]) in people with Parkinson disease (PD). Here, we aimed to expand our understanding of mechanical muscle function in people with PD (PwPD) by systematically reviewing (1) the psychometric properties of isokinetic/isometric dynamometry in PD, (2) the literature comparing mechanical muscle function in PwPD with healthy controls (HC), and (3) reported associations between muscle mechanical muscle function and functional capacity and/or disease severity. METHODS: Systematic literature search in 6 databases. Included studies had to (1) enroll and report data on PwPD, (2) include assessment(s) of psychometric properties (ie, validity, reliability, responsiveness) of isokinetic/isometric dynamometry in PD, and/or (3) assess mechanical muscle function in both PwPD and HC using isokinetic/isometric dynamometry. RESULTS: A total of 40 studies were included. Aim 1 studies (n = 2) showed high reliability for isometric dynamometry (hip-abductor/dorsiflexor/trunk flexor-extensor/handgrip: intraclass correlations coefficients range = 0.92-0.98). Aim 2 studies (n = 40) showed impaired mechanical muscle function (ie, strength, power, RFD) in PwPD compared with HC (effect sizes range = 0.52-1.89). Aim 3 studies (n = 11) showed weak-to-strong associations between overall and lower extremities muscle strength and functional capacity and/or disease severity outcomes (ie, Unified Parkinson Disease Rating Scale). DISCUSSION AND CONCLUSIONS: Sparse methodological evidence suggests high reliability when using dynamometry in PwPD. Muscle strength, power, and RFD are impaired in PwPD compared with HC. Muscle strength is associated with functional capacity and disease severity.Video Abstract available for more insights from the authors (see the Video, Supplemental Digital Content 1, available at: http://links.lww.com/JNPT/A403 ).

Adults with spina bifida: ambulatory performance and cognitive capacity in relation to muscle function.

STUDY DESIGN: Cross-sectional study. OBJECTIVE: Describe and compare ambulatory performance and cognitive capacity in relation to muscle function in an adult cohort with spina bifida. Also, explore factors associated with ambulation in participants with muscle function level 3. SETTING: Specialist clinic for adults with spinal cord disorders in Stockholm, Sweden. METHODS: A total regional cohort of adults (n = 219) with spina bifida was invited, 196 (104 women, mean age 35 years, SD 13 years) participated. Mode of mobility, cognitive capacity and muscle function were investigated. For participants with muscle function level 3, factors associated with ambulation were investigated using multivariate logistic regression analysis. RESULTS: In all, 84 participants (42%) were community ambulators, 22 (12%) household ambulators and 90 (46%) wheelchair users. There was a linear association between the lower degree of muscle function and scoliosis (P < 0.001). Mode of mobility varied despite similar muscle prerequisites in participants with muscle function level 3 (n = 58). Factors associated with ambulation in participants with muscle function level 3 were the absence of scoliosis, lower BMI and higher cognitive capacity. CONCLUSIONS: Cognitive capacity and mode of mobility varied widely across the cohort. However, in participants with muscle function level 3, despite similar muscular prerequisites, a large variation in the mode of mobility was found, suggesting that other factors were involved. It is important to prevent scoliosis, support a healthy lifestyle, as well as offer cognitive screening and support to promote ambulatory function and optimise independence in the everyday lives of adults with spina bifida.

Physical activity profiles in Parkinson's disease.

BACKGROUND: Identifying physical activity (PA) profiles of people with Parkinson's Disease (PD) could provide clinically meaningful knowledge concerning how to tailor PA interventions. Our objectives were therefore to i) identify distinct PA profiles in people with PD based on accelerometer data, ii) explore differences between the profiles regarding personal characteristics and physical function. METHODS: Accelerometer data from 301 participants (43% women, mean age: 71 years) was analysed using latent profile analyses of 15 derived PA variables. Physical function measurements included balance performance, comfortable gait speed and single and dual-task functional mobility. RESULTS: Three distinct profiles were identified; "Sedentary" (N = 68), "Light Movers" (N = 115), "Steady Movers" (N = 118). "Sedentary" included people with PD with high absolute and relative time spent in Sedentary behaviour (SB), little time light intensity physical activity (LIPA) and negligible moderate-to-vigorous physical activity (MVPA). "Light Movers" were people with PD with values close to the mean for all activity variables. "Steady Movers" spent less time in SB during midday, and more time in LIPA and MVPA throughout the day, compared to the other profiles. "Sedentary" people had poorer balance (P = 0.006), poorer functional mobility (P = 0.027) and were more likely to have fallen previously (P = 0.027), compared to "Light Movers. The Timed Up and Go test, an easily performed clinical test of functional mobility, was the only test that could distinguish between all three profiles. CONCLUSION: Distinct PA profiles, with clear differences in how the time awake is spent exist among people with mild-moderate PD.

Physical Activity and Perceived Health in People With Parkinson Disease During the First Wave of Covid-19 Pandemic: A Cross-sectional Study From Sweden.

BACKGROUND: People with Parkinson disease (PD) are known to be at risk of physical inactivity and may therefore be especially vulnerable to negative health outcomes during the COVID-19 pandemic due to social distancing recommendations. PURPOSE: To investigate sensor-derived physical activity and perceived health of people with PD during the first wave of the COVID-19 pandemic, as well as the factors associated with these outcomes. METHODS: Physical activity was measured over 7 days using the Actigraph GT3x accelerometer. Data were collected regarding perceived health status and physical activity habits, as well as rehabilitation attendance during the pandemic. Multiple linear and logistic regression analyses were used to identify factors associated with physical activity and perceived changes in health. RESULTS: Of 89 participants, a majority (67%) reported a pandemic-related reduction in exercise habits. Women more commonly reported a reduction in scheduled exercise and cancelled rehabilitation than men. Study participants took on average 5876 ± 3180 steps per day. In the multivariate analysis, female gender, being 70 years of age and older, and greater reported mobility problems were associated with being less physically active. A pandemic-induced deterioration in health was reported by 42% and women were 5 times more likely than men to do so (odds ratio: 5.12, 95% confidence interval, 1.87-15.03; P = 0.002). DISCUSSION AND CONCLUSIONS: Despite a pandemic-related reduction in reported exercise habits and rehabilitation, the participants in this Swedish sample were relatively physically active. However, women were less active at moderate-vigorous levels and were at greater risk of deterioration in perceived health during this time.Video Abstract available for more insight from the authors (see the Video, Supplemental Digital Content 1, available at: http://links.lww.com/JNPT/A359).

Implementation of highly challenging balance training for Parkinson's disease in clinical practice: a process evaluation.

BACKGROUND: Process evaluations provide contextual insight into the way in which interventions are delivered. This information is essential when designing strategies to implement programs into wider clinical practice. We performed a process evaluation of the HiBalance effectiveness trial investigating the effects of a 10-week of highly challenging and progressive balance training for mild-moderate Parkinson's disease (PD). Study aims were to investigate i) the quality and quantity of intervention delivery and ii) barriers and facilitators for implementation. METHODS: Process outcomes included; Fidelity; Dose (delivered and received) Recruitment and Reach. Investigation of barriers and facilitators was guided by the Consolidated Framework for Implementation Research. Program delivery was assessed across four neurological rehabilitation sites during a two-year period. Data collection was mixed-methods in nature and quantitative and qualitative data were merged during the analysis phase. RESULTS: Thirteen program trainers delivered the intervention to 12 separate groups during 119 training sessions. Trainer fidelity to program core components was very high in 104 (87%) of the sessions. Participant responsiveness to the core components was generally high, although adherence to the home exercise program was low (50%). No significant context-specific differences were observed across sites in terms of fidelity, dose delivered/ received or participant characteristics, despite varying recruitment methods. Facilitators to program delivery were; PD-specificity, high training frequency and professional autonomy. Perceived barriers included; cognitive impairment, absent reactional balance among participants, as well a heterogeneous group in relation to balance capacity. CONCLUSION: These findings provide corroborating evidence for outcome evaluation results and valuable information for the further adaptation and implementation of this program. Important lessons can also be learned for researchers and clinicians planning to implement challenging exercise training programs for people with mild-moderate PD. TRIAL REGISTRATION: ClinicalTrials.gov, NCT02727478 , registered 30 march, 2016 - Retrospectively registered.

Highly challenging balance and gait training for individuals with Parkinson's disease improves pace, rhythm and variability domains of gait - A secondary analysis from a randomized controlled trial.

OBJECTIVE: Evaluate immediate and long-term effects of highly challenging balance and gait training on pace-, rhythm-, variability-, asymmetry-, and postural control domains of gait for individuals with Parkinson's disease (PD). DESIGN: Randomized controlled trial - a secondary analysis. SETTING: University hospital setting. PARTICIPANTS: One-hundred older adults with mild to moderate PD (Hoehn & Yahr 2 and 3). INTERVENTION: Training group (n = 51): 10 weeks (3 times/week) of intensive balance and gait training, incorporating dual tasks. Control group (n = 49): care as usual. MAIN OUTCOME MEASURES: Spatiotemporal gait variables collected during normal and fast walking on a pressure-sensitive mat. A linear mixed model was used to evaluate training effects post intervention and at the 6 and 12 month follow-up. RESULTS: Immediate training effects in the pace domain of gait were increased step velocity (normal speed: 8.2 cm/s, P = 0.04; fast: 10.8 cm/s, P < 0.01), increased step length (normal speed: 3 cm, P = 0.05; fast: 2.3 cm, P = 0.05) and reduced swing time variability (fast speed: -2.5 ms, P = 0.02). In the rhythm domain reduced step time (fast speed: -19.3 ms, P = 0.02), stance time (normal: -24.3 ms, P = 0.01; fast: -29.6 ms, P = 0.02) and swing time (fast speed: -8.7 ms, P = 0.04) was seen. Relative to the variability domain, the training decreased step time variability (fast: -2.8 ms, P = 0.02) and stance time variability (fast: -3.9 ms, P = 0.02). No training effects were retained at 6 months. CONCLUSIONS: Highly challenging balance and gait training improved pace, rhythm and variability aspects of PD gait in the short-term, but effects are not retained long-term. TRIAL REGISTRATION NUMBER: NCT01417598.

Choreographing life-experiences of balance control in people with Parkinson's disease.

BACKGROUND: Parkinson's disease (PD) is a devastating neurodegenerative disorder. Reduced balance is one of the cardinal symptoms of PD, predisposing people living with PD to experience difficulties with the execution of tasks and activities, as well as hindering their involvement in meaningful life areas. The overarching aim of this study was to explore how deficits in balance control manifest in everyday life and how it is managed by people with PD (PwPD). METHODS: Qualitative description was used as methodology, and in-depth interviews were conducted with 18 participants, between the ages of 46 to 83 years, with mild to severe PD. Interview transcripts were analyzed using qualitative content analysis, following an inductive approach. RESULTS: One theme emerged from the analysis: Increased planning-choreographing life. Within this overarching theme, two categories were identified, namely Limitations in mobility and New restricted functioning in everyday life, each with 3-4 sub-categories. The categories described how PwPD handled decreased balance control in their everyday life by using motor and cognitive strategies as a consequence of not trusting their body's capacity to control balance. Activities in everyday life, as well as the ability to partake in leisure and social activities were profoundly affected. CONCLUSION: People with mild to severe PD used strategies to handle decreased balance and they choreographed their lives around their individual current state of mobility and balance. The knowledge gained from this study can be used to develop targeted interventions addressing the nuances of balance deficits in everyday life.

Outcome Evaluation of Highly Challenging Balance Training for People With Parkinson Disease: A Multicenter Effectiveness-Implementation Study.

BACKGROUND AND PURPOSE: In order for people with Parkinson disease (PwPD) to benefit from neurorehabilitation research, interventions tested in research settings require assessment in real-world clinical practice. There is little evidence for whether efficacious exercise interventions for PwPD remain effective when transferred to standard clinical settings. The aim of this study was to assess the clinical effectiveness of the adapted HiBalance program on balance control and gait among PwPD. METHODS: Participants (n = 117) with mild-moderate Parkinson disease were consecutively included into either the 10-week HiBalance group training (n = 61) or the control (n = 56) group. The main outcome was balance performance (Mini-BESTest). Secondary outcomes were comfortable gait speed (10-m Walk Test); functional mobility (Timed Up and Go [TUG] test) and dual-task interference (cognitive TUG test); physical activity level (steps per day); perceived balance confidence (Activities-specific Balance Confidence scale) and perceived walking difficulty (Walk-12G) and self-rated health (EQ-5D visual analog scale). RESULTS: In total, 98 people completed the trial. Compared with controls, the training group showed significant improvement in balance performance (P < 0.001), gait speed (P = 0.001), and dual-task interference (P = 0.04) following the intervention. No group differences were observed for physical activity level or any patient-reported measures. DISCUSSION AND CONCLUSIONS: Highly challenging balance training is effective at improving balance, gait, and dual-task performance when delivered at a clinically feasible dose, in a range of rehabilitation settings, without direct involvement of the research group.Video Abstract available for more insights from the authors (see the Video, Supplementary Digital Content 1, available at: http://links.lww.com/JNPT/A299).

A health concept with a social potential: an interview study with nursing home residents.

BACKGROUND: A qualitative, interview-based study was embedded in a randomized intervention trial, the Older People Exercise and Nutrition (OPEN) study. Participants in the OPEN study were encouraged to conduct sessions of sit-to-stand (STS) exercises combined with Oral Nutritional Supplements (ONS) intake. The aim was to describe the older persons' perceptions and experiences of being given the daily opportunity to perform the STS exercise and drink ONS. METHODS: In-depth interviews were conducted in six nursing homes with the participants using a semi-structured interview guide. One or two individual interviews were performed with each included participant. Twenty-three NH residents (16 women and 7 men) participated in the qualitative study. Their ages ranged between 76 and 96 years, and their Mini Mental State Examination (MMSE) scored between 8 and 29. The transcribed interviews and field notes written during the visits were analyzed inductively following a constant comparative method described in Grounded Theory. RESULTS: The exercise and nutritional intervention was described as highly practical by the NH residents, who claimed it also had a social aspect as they felt acknowledged and empowered to engage others in the combined intervention. Experiences of the intervention ranged from neutral to mainly positive and could be sorted into 5 categories: 1. Perceived hopes and expectations, 2. Health-related driving forces, 3. Appreciated daily activities, 4. A concept easy to perform and integrate into daily life, 5. A beneficial health concept for all. The intervention created perceived benefits on various health aspects due to participants feeling energized and stronger. An overall theme was identified as A health concept with a social potential, as participants feel acknowledged and strong enough to help others. CONCLUSIONS: The intervention was described by participants as a health concept that could potentially be beneficial for a broader spectrum of NH residents. The findings indicate that health concepts, such as STS/ONS, might contribute to a more meaningful day for older people, even vulnerable NH residents approaching the end of life. TRIAL REGISTRATION: ClinicalTrials.govIdentifier: NCT02702037 . Date of trial registration February 26, 2016.

Predictors of improved balance performance in persons with Parkinson's disease following a training intervention: analysis of data from an effectiveness-implementation trial.

OBJECTIVE: (1) To determine associated factors of improved balance performance after a 10-week HiBalance intervention period, and (2) to determine effects of the programme on modifiable factors found above, considering both groups. DESIGN: Pre-posttest substudy founded on the outcomes evaluation of an effectiveness-implementation trial. PARTICIPANTS: Sixty-one participants were allocated the HiBalance training, while 56 were controls. INTERVENTION: Participants received a 10-week, two times weekly, progressive balance training, that is, HiBalance intervention, led by physical therapists. The intervention was group based and gradually incorporated dual-tasking over the training period. Participants also performed, unsupervised, a 1×/week home exercise programme. MAIN OUTCOME: The Mini-Balance Evaluation Systems Test (Mini-BESTest) assessed balance performance, and those having improved by ⩾2 points were classified as positive responders. Balance confidence was the secondary outcome. RESULTS: Fifty-three (87%) participants completed the intervention and 32 (60%) improved their balance scores by ⩾2 points in the intervention group, with 11 (24%) in the control group. The multivariable logistic regression analysis revealed two independently associated factors of improved balance, which included balance confidence (odds ratio (OR) = 0.95; 95% confidence interval (CI) = 0.90-0.99) and attendance of ⩾80% of training sessions (OR = 10.10; 95% CI = 1.71-59.60). The final model demonstrated good fit and acceptable discrimination (area under the curve = 0.84). Secondary analysis revealed a fair relationship (Rho = 0.30; P = 0.044) between improvements in balance confidence and balance performance in the intervention but not control group. CONCLUSION: Two personal factors were significantly associated with a higher likelihood of improvement in clinically measured balance performance. The HiBalance intervention appears to benefit those with lower balance confidence.

Defining accelerometer cut-points for different intensity levels in motor-complete spinal cord injury.

STUDY DESIGN: Descriptive. OBJECTIVE: The present aim was to define accelerometer cut-point values for wrist-worn accelerometers to identify absolute- and relative-intensity physical activity (PA) levels in people with motor-complete paraplegics (PP) and tetraplegics (TP). SETTINGS: Rehabilitation facility in Sweden. METHODS: The participants were 26 (19 men, 7 women) with C5-C8, AIS A and B (TP) and 37 (27 men, 10 women) with T7-T12 (PP), AIS A and B. Wrist-worn accelerometer recordings (Actigraph GT3X+) were taken during seven standardized activities. Oxygen consumption was measured, as well as at-rest and peak effort, with indirect calorimetry. Accelerometer cut-points for absolute and relative intensities were defined using ROC-curve analyses. RESULTS: The ROC-curve analyses for accelerometer cut-points revealed good-to-excellent accuracy (AUC >0.8), defining cut-points for absolute intensity (2, 3, 4, 5, 6, 7 METs for PP and 2 to 6 METs for TP) and relative intensity (30, 40, 50, 60, 70, and 80% for PP and 40-80% for TP). The cut-points for moderate-to-vigorous physical activity was defined as ≥9515 vector magnitude counts per minute (VMC) for PP and ≥4887 VMC/min for TP. CONCLUSION: This study presents cut-points for wrist-worn accelerometers in both PP and TP, which could be used in clinical practice to describe physical activity patterns and time spent at different intensity levels.

Correction: Defining accelerometer cut-points for different intensity levels in motor-complete spinal cord injury.

A correction to this paper has been published and can be accessed via a link at the top of the paper.

Exercise-Induced Neuroplasticity in Parkinson's Disease: A Metasynthesis of the Literature.

Parkinson's disease (PD) is a neurodegenerative disorder for which there is currently only symptomatic treatment. During the last decade, there has been an increased interest in investigating physical exercise as a neuroprotective mechanism in PD. Animal studies have suggested that exercise may in fact induce neuroplastic changes, but evidence in humans is still scarce. A handful of reviews have previously reported on exercise-induced neuroplasticity in humans with PD, but few have been systematic, or have mixed studies on both animals and humans, or focused on one neuroplastic outcome only. Here, we provide a systematic review and metasynthesis of the published studies on humans in this research field where we have also included different methods of evaluating neuroplasticity. Our results indicate that various forms of physical exercise may lead to changes in various markers of neuroplasticity. A narrative synthesis suggests that brain function and structure can be altered in a positive direction after an exercise period, whereas a meta-analysis on neurochemical adaptations after exercise points in disparate directions. Finally, a GRADE analysis showed that the current overall level of evidence for exercise-induced neuroplasticity in people with PD is very low. Our results demonstrate that even though the results in this area point in a positive direction, researchers need to provide studies of higher quality using more rigorous methodology.

Intersegmental coordination patterns are differently affected in Parkinson's disease and cerebellar ataxia.

The law of intersegmental coordination (Borghese et al. 1996) may be altered in pathological conditions. Here we investigated the contribution of the basal ganglia (BG) and the cerebellum to lower limb intersegmental coordination by inspecting the plane's orientation and other parameters pertinent to this law in patients with idiopathic Parkinson's disease (PD) or cerebellar ataxia (CA). We also applied a mathematical model that successfully accounts for the intersegmental law of coordination observed in control subjects (Barliya et al. 2009). In the present study, we compared the planarity index (PI), covariation plane (CVP) orientation, and CVP orientation predicted by the model in 11 PD patients, 8 CA patients, and two groups of healthy subjects matched for age, height, weight, and gender to each patient group (Ctrl_PD and Ctrl_CA). Controls were instructed to alter their gait speed to match those of their respective patient group. PD patients were examined after overnight withdrawal of anti-parkinsonian medications (PD-off-med) and then on medication (PD-on-med). PI was above 96% in all gait conditions in all groups suggesting that the law of intersegmental coordination is preserved in both BG and cerebellar pathology. However, the measured and predicted CVP orientations rotated in PD-on-med and PD-off-med compared with Ctrl_PD and in CA vs. Ctrl_CA. These rotations caused by PD and CA were in opposite directions suggesting differences in the roles of the BG and cerebellum in intersegmental coordination during human locomotion. NEW & NOTEWORTHY Kinematic and muscular synergies may have a role in overcoming motor redundancies, which may be reflected in intersegmental covariation. Basal ganglia and cerebellar networks were suggested to be involved in crafting and modulating synergies. We thus compared intersegmental coordination in Parkinson's disease and cerebellar disease patients and found opposite effects in some aspects. Further research integrating muscle activities as well as biomechanical and neural control modeling are needed to account for these findings.

The EXPANd trial: effects of exercise and exploring neuroplastic changes in people with Parkinson's disease: a study protocol for a double-blinded randomized controlled trial.

BACKGROUND: Parkinson's disease (PD) affects many physiological systems essential for balance control. Recent studies suggest that intensive and cognitively demanding physical exercise programs are capable of inducing plastic brain changes in PD. We have developed a highly challenging balance training (the HiBalance) program that emphasizes critical aspects of balance control through progressively introducing more challenging exercises which incorporates dual-tasking. Earlier studies have shown it to be effective in improving balance, gait and dual-tasking. The study design has thereafter been adjusted to link intervention-induced behavioral changes to brain morphology and function. Specifically, in this randomized controlled trial, we will determine the effects of the HiBalance program on balance, gait and cognition and relate this to task-evoked functional MRI (fMRI), as well as brain-derived neurotrophic factor (BDNF) in participants with mild-moderate PD. METHODS: One hundred participants with idiopathic PD, Hoehn & Yahr stage 2 or 3, ≥ 60 years of age, ≥ 21 on Montreal Cognitive Assessment will be recruited in successive waves and randomized into either the HiBalance program or to an active control group (the HiCommunication program, targeting speech and communication). Both interventions will be performed in small groups, twice a week with 1 h sessions for 10 weeks. In addition, a 1 h, once a week, home exercise program will also be performed. A double-blinded design will be used. At the pre- and post-assessments, participants will be assessed on balance (main outcome), gait, cognitive functions, physical activity, voice/speech function, BDNF in serum and fMRI (3 T Philips) during performance of motor-cognitive tasks. DISCUSSION: Since there is currently no cure for PD, findings of neuroplastic brain changes in response to exercise would revolutionize the way we treat PD, and, in turn, provide new hope to patients for a life with better health, greater independence and improved quality of life. TRIAL REGISTRATION: ClincalTrials.gov: NCT03213873, first posted July 11, 2017.