Stroke is a prevalent condition that affects 12.2 million people annually worldwide (Feigin et al., 2022). Over 80% of these individuals often experience deficits in walking ability, which impedes quality of life (Duncan et al., 2005; Tsao et al., 2022). Many gait rehabilitation approaches focus on improving gait velocity and spatiotemporal gait parameters, such as increasing step length or swing time, because changes in these metrics could lead to significant improvements in community walking ability and lower limb motor control (Bijleveld-Uitman et al., 2013). However, simply increasing walking speed or changing spatiotemporal parameters of both legs does not necessarily result in a more symmetric walking pattern. The person may walk faster but with an asymmetric walking pattern (Hsu et al., 2003; Wang et al., 2020). Gait asymmetry can be attributed to motor impairments such as impaired proprioception, decreased muscle strength, spasticity, and impaired balance control (Balasubramanian et al., 2007; Patterson et al., 2008; Titianova et al., 2008). The high prevalence of gait asymmetry after stroke has been linked to a higher risk of multiple negative consequences including impaired balance (Hendrickson et al., 2014), inefficient and increased metabolic costs (Ellis et al., 2013), and long-term musculoskeletal dysfunction (Jørgensen et al., 2000). Therefore, achieving spatiotemporal symmetry in gait is also crucial, as it facilitates inter-limb coordination, improves efficiency, and reduces the risk of falls (Wonsetler and Bowden, 2017).
To target gait symmetry in rehabilitation, the most common interventions are split-belt treadmill training and single-belt treadmill training, combined with visual and/or audio cueing. Split-belt treadmill training involves walking on a treadmill with belts moving at different speeds, which increases the stance time on the slow belt and swing time on the fast belt. This creates a motor error that reorganizes gait patterns, which are then applied when returning to tied-belt or overground walking (Hinton et al., 2020). Multiple studies have demonstrated that a single session of split-belt treadmill training instantly improves step length symmetry (Reisman et al., 2009; Lauzière et al., 2014; Malone and Bastian, 2014; Hirata et al., 2019). Similarly, studies have shown that combining single-belt treadmill training with visual or auditory cueing can improve gait symmetry in individuals post-stroke (Roerdink et al., 2007; Mainka et al., 2018; Shin and Chung, 2022). The visual or auditory cueing provides closed-loop sensory feedback, enabling real-time adjustments and improving the effectiveness of the training (Baram, 2013). While both interventions effectively improve gait symmetry, they also pose unique concerns. Reisman et al. (2013) observed that 12 training sessions of split-belt treadmill training improved only step length symmetry, but not temporal symmetries or gait velocity. Absence of control groups in prior split-belt studies further limits the evidence for the effectiveness of this training method. Although single-belt training is much more accessible and can successfully increase gait velocity, it does not enhance symmetry, unless combined with therapist cueing. Moreover, the evidence for using a single-belt combined with cueing to improve symmetry is far less established than split-belt treadmill training (Roerdink et al., 2007; Mainka et al., 2018; Shin and Chung, 2022). However, to date, there is no comparative analysis between split-belt and single-belt training combined with cueing interventions to establish which intervention is more effective for improving gait velocity, spatiotemporal parameters, and symmetry.
Therefore, this study aimed to 1) compare the acute effects of both interventions on spatiotemporal parameters and symmetry immediately after a single session of training and 2) determine whether the changes persisted after a 5-min period of seated rest, and 3) assess the amounts of symmetry improvement relative to the baseline symmetry for each treadmill training type. We hypothesized that both interventions would impact spatiotemporal parameters, but that split-belt training would improve step length symmetry more. Additionally, we predicted the 5-min rest period would reduce training effects since the newly-adopted movement pattern might diminish without reinforcement.
2 Materials and methods2.1 SubjectsTen participants with chronic stroke were recruited (Table 1). Inclusion criteria for the participants were: 1) history of a single, unilateral, supratentorial, stroke at least 1 year prior to participation 2) comfortable gait speed less than 1.0 m/s, and 3) medically stable with medical clearance to participate (absence of concurrent illness, including unhealed bone fractures or pressure sores, active injuries or infections, cardiopulmonary disease, osteoporosis, peripheral nerve damage in the lower limbs, and a history of any neurologic conditions). Exclusion criteria were as follows: 1) history of multiple strokes or bilateral strokes, 2) pregnant or nursing, 3) Modified Ashworth Score of three or greater in the lower extremity muscle groups, 4) Botox injections in the lower extremity within the last 4 months, or 5) presence of severe contractures in the lower extremities. All participants gave informed consent before participation. All participants gave informed consent before participation. All study-related procedures were approved by the Northwestern University Institutional Review Board (STU00215009), Northwestern University, Chicago, IL, United States. The study protocol was registered at clinicaltrials.gov (NCT05167786).
Table 1. Demographic and clinical characteristics of participants.
2.2 ProtocolParticipants completed two interventions on separate days in a random order: one single-belt treadmill (Woodway® United States, Waukesha, WI) session and one split-belt treadmill (Woodway® United States, Waukesha, WI) session. Interventions started with a baseline gait assessment followed by 30-min of treadmill training. Participants were reassessed immediately after training and again after 5 min of seated recovery (Figure 1). Assessments included three 10-m walk tests at self-selected (SSV) and three 10-m walk test at fast velocity (FV) over a GAITRite® walkway (CIR Systems Inc., NJ, United States). For FV, participants were instructed to walk as fast and safely as possible. Baseline trials were processed to 1) calculate average gait velocities and 2) determine which leg had a shorter step length.
Figure 1. Schematic protocol of the study. During the split-belt walking, “TIED” or “SPLIT” indicate when two belts moved at the same speed or different speeds, respectively. The leg with the shorter step length was on the fast belt at FV, the leg with the longer step length was on the slow belt at ½FV.
The split-belt treadmill (Woodway® United States, Waukesha, WI) training started with 2 min of tied-belt walking (both belts at ½ FV), 25 min of split-belt walking (fast belt at FV, slow belt at ½FV), and finally 5 min of tied-belt walking (goal: both belts at ½ FV). The leg with shorter step length was placed on the fast belt. Single-belt treadmill training (Woodway® United States, Waukesha, WI) consisted of 2 min warm up (½ fast over-ground speed), 25 min of training (fast over-ground speed), and 5 min of cool down (½ fast over-ground speed). During single-belt training, a physical therapist cued for spatiotemporal symmetry and a mirror was placed in front of the treadmill for visual feedback. Before the first split-belt training session, each participant underwent a familiarization period on the treadmill to get used to walking on the device. The participants were encouraged not to hold on to the handrails during both sessions. A ceiling-mounted safety harness was utilized without providing body weight support. Sitting breaks were provided upon participant’s request. Blood pressure (BP) was assessed pre and post ambulation. Heart rate (HR) and Rated Perceived Exertion (RPE) were monitored throughout the training. Participants were transported via wheelchair to complete post-training assessments to avoid walking between training and assessment.
2.3 Data collection and analysisDuring each assessment, step length, stride length, swing time, and stance time of over-ground gait were collected by the GAITRite walkway. Spatiotemporal symmetry indices were calculated (Eq. 1) for each participant from the obtained metrics.
Symmetry Index=Xshorter − Xlonger0.5Xshorter+Xlonger(1)Xshorter and Xlonger are the value of each spatiotemporal parameter on the shorter and longer side, respectively. The spatiotemporal parameters and symmetry values were calculated for SSV at baseline, post-training (immediate change), and post 5 min of rest (delayed change). A smaller symmetry index value indicates a more symmetric gait. Spatiotemporal symmetries were used to obtain the percent changes from baseline as shown in Eqs 2, 3. A positive percent change indicates a greater post value compared to baseline or increased asymmetry.
Immediate change=VPost−training−VBaselineVBaseline×100%(2)Delayed change=VPost−rest−VBaselineVBaseline×100%(3)2.4 Statistical analysisThe Kolmogorov–Smirnov test was used to assess the normality of the data. The data of all the outcomes was normally distributed. Generalized estimating equations (GEEs; Link Function = Identity; Structure of Covariance Matrix = Exchangeable) were conducted to test the effects of treadmill intervention (single vs. split belt) and time (baseline vs. post-training vs. post-rest) on all gait spatiotemporal and symmetry parameters. An alpha level was set at 0.05 a priori. Interaction effects were examined by post hoc pairwise comparisons with sequential Bonferroni adjustments. GEE was selected because it obtains higher power with a small sample size compared to repeated measured analysis of variance (Ma et al., 2012; Naseri et al., 2016). Spearman correlations were calculated to test the relationship between the symmetry changes (Immediate/Delayed change) and baseline gait parameters. Statistics were performed in SPSS (SPSS Statistics v27, IBM Corp., US).
3 Results3.1 Spatiotemporal gait parametersStatistical results are in Table 2. We found significant changes with time for gait velocity (X2 = 21.45, p < 0.001), shorter (X2 = 4.55, p = 0.033) and longer (X2 = 13.27, p = 0.001) step lengths, shorter (X2 = 12.76, p = 0.002) and longer (X2 = 12.87, p = 0.002) stride lengths, and shorter stance time (X2 = 9.03, p = 0.011). Pairwise comparisons showed gait velocity improved (10.13% increase, p < 0.001) after rest compared to baseline for both training types. In both training types, shorter step length increased immediately after training (6.41% increase, p = 0.004). Longer step length (5.32% increase, p = 0.004), shorter stride length (6.96% increase, p = 0.001) and longer stride length (7.14% increase, p = 0.001) all increased after rest compared to baseline. Shorter stance time (3.61% decrease, p = 0.044) became even shorter after rest.
Table 2. Gait parameters in self-selected velocity. Values are shown as mean ± standard error in the table. * indicates significant difference.
3.2 SymmetryOnly step length symmetry showed a significant treadmill*time interaction (X2 = 10.51, p = 0.005) and a significant treadmill effect (X2 = 11.40, p < 0.001), all other symmetry parameters did not change with time or treadmill. Figure 2 shows step length symmetry immediately improved only after split-belt (27.27% decrease, p = 0.040), but not single-belt treadmill training (p = 0.509). However, after rest, there was no significant difference between the two treadmill training types.
Figure 2. (A) Step length symmetry, (B) stride length symmetry, (C) swing time symmetry, and (D) stance time symmetry under self-selected velocity in two treadmill training. Tr: main effect of treadmill, Tr*T: interaction effect of treadmill and time.
3.3 CorrelationsThe immediate change of symmetry was not statistically correlated with any baseline gait parameters for either treadmill training type. However, the delayed change of SSV stride length symmetry (R = −0.661, p = 0.038; Figure 3B) and swing time symmetry (R = −0.661, p = 0.038; Figure 3C) were significantly correlated with baseline symmetry in single-belt treadmill training. Greater spatiotemporal symmetry improvements were associated with worse spatiotemporal symmetry at baseline for the single-belt treadmill only.
Figure 3. Correlations between baseline and delayed change. (A) Step length symmetry, (B) Stride length symmetry, (C) Swing time symmetry, (D) Stance time symmetry. Stride length symmetry and swing time symmetry showed significant correlations between baseline and delayed change only in single-belt treadmill training.
4 DiscussionThis is the first comparison of single-session effects of single-belt and split-belt treadmill training on spatiotemporal measures in stroke survivors. Our results demonstrated that: 1) Both treadmill training types immediately increased shorter step length. Step length symmetry immediately improved significantly only after split-belt treadmill training, without compromising temporal symmetry or gait velocity. 2) Post-training rest of 5 min improved gait velocity and spatial gait performance. However, unlike the gait velocity and spatial gait performance, step length symmetry was insignificantly different from baseline after the rest. 3) Swing time and stride length symmetry improvements were associated with poor baseline levels in single-belt but not associated with baseline levels in split-belt training. These findings suggest that split-belt treadmill training might be superior to single-belt treadmill training when specifically targeting step length symmetry. However, both types of training were found to improve gait velocity and shorter step length. More research is needed to compare the long-term effects since the step length symmetry effects diminish after 5 min of rest.
4.1 Immediate training effectsShorter step length was the only spatiotemporal parameter to show immediate training effects. The shorter step length immediately increased after both treadmill training, as observed in previous studies (Gama et al., 2017; Betschart et al., 2018). This could be attributed to the increased range of motion of the limb at faster velocities. Our split-belt training protocol placed the shorter step length side on the fast belt, which increased the step length on that side while maintaining the longer step length on the slow belt, leading to immediate improvement in symmetry. In contrast, with single-belt training, step length increased on both sides, thus not altering step length symmetry.
4.2 Rest effectsWe hypothesized that the training effects on spatiotemporal gait parameters would diminish after 5 min of rest, but our results showed the opposite. The rest reduced fatigue, which possibly amplified the training effect. Reisman et al. (2013) reported no gait velocity improvement after 12 split-belt training sessions. This might also be attributed to fatigue that was induced by their longer training duration at each session. Stroke survivors adapt to split-belt training slower than neurologically intact controls do (Savin et al., 2013; Tyrell et al., 2014). To develop an effective split-belt training paradigm, future studies could test various training and rest durations.
4.3 Differences between treadmillsIn this study, only split-belt treadmill training immediately improved step length symmetry without compromising gait velocity or other symmetry parameters. Additionally, single-belt treadmill baseline values were negatively correlated with the spatiotemporal symmetry improvement. Therefore, single-belt treadmill training requires worse baseline symmetry in stride length and swing time to generate spatiotemporal symmetry improvements, while this was not necessary for split-belt treadmill training. This supports choosing split-belt treadmill training to target symmetry in stroke rehabilitation. Using the error augmentation strategy (Reisman et al., 2013), we placed the leg with shorter step length on the fast belt, the fast belt further shortened the step length of the leg, exaggerating the “error” of step length asymmetry. Afterwards, when assessing the effects on gait, the aftereffects led to participants correcting “the error”, resulting in the observed increased step length in the short side and maintenance of step length in longer side which in turn improved step length symmetry (Helm and Reisman, 2015). Split-belt training induces proprioceptive feedback through walking in an abnormal pattern, which informs the central pattern generators and supraspinal centers to modify the motor output to adapt and achieve a new gait pattern (Hinton et al., 2020). In contrast, single-belt treadmill walking maintains a pattern similar to over ground walking, and the participants correct the walking pattern according to the visual or auditory feedback (Pereira et al., 2016), where we observe an increase on step length symmetry by increasing both the short and long step lengths, although the improvements on symmetry are not significant.
4.4 Clinical implications and future research directionsOur study suggests that both single-belt and split-belt treadmill training effectively improve gait speed and step length on the shorter side in individuals with asymmetrical gait patterns. More interestingly, temporal symmetry remained unchanged after split-belt treadmill training. Our results indicate that split-belt treadmill training improves step length symmetry without compromising temporal symmetry, aligning with findings from a previous study by Lewek et al. (2018). Clinicians should incorporate split-belt treadmill training to target step length symmetry and consider additional strategies to maintain these improvements. This study is limited by its small sample size and its use of single training session results. To provide better suggestions for clinicians, future studies could consider increasing the sample size and conducting multiple sessions of training. Long-term effects of both training types should be investigated to understand the sustainability of improvements.
5 ConclusionOur results demonstrate that both single-belt and split-belt treadmill training equally improve gait speed and step length on the shorter side. Split-belt training resulted in a significant improvement in step length symmetry immediately after training without impairing other temporal symmetries. However, this effect diminished after a 5-min rest. Interestingly, the short period of post-training rest reinforced spatial gait improvements from both types of treadmill training, which might be a result of reduced fatigue. However, further studies are needed to explore the long-term training effects between different types of treadmill, as the step length symmetry tends to converge between two treadmill training after a 5-min rest period. These findings highlight the potential of split-belt treadmill training to enhance gait symmetry in stroke rehabilitation. By refining and extending these training protocols, we have the opportunity to significantly improve patient outcomes, leading to more efficient and safer ambulation for individuals post-stroke.
Data availability statementThe raw data supporting the conclusion of this article will be made available by the authors, without undue reservation.
Ethics statementThe studies involving humans were approved by Northwestern University Institutional Review Board (STU00215009). The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.
Author contributionsCY: Writing–review and editing, Writing–original draft, Visualization, Project administration, Methodology, Investigation, Formal Analysis, Conceptualization. NV: Writing–review and editing, Validation, Methodology, Investigation, Conceptualization. KM: Writing–review and editing, Validation, Methodology, Data curation. SA: Writing–review and editing, Validation, Methodology, Data curation. KE: Writing–review and editing, Validation, Supervision, Project administration. AK: Writing–review and editing, Validation. ER: Writing–review and editing, Supervision. AJ: Writing–review and editing, Supervision, Resources, Project administration, Funding acquisition.
FundingThe author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This work was supported by the NIH under Grant R01HD106015.
AcknowledgmentsWe acknowledge Clara Prasse, Jonathan Mendley, and Kayla Alamdari for their help with data collection.
Conflict of interestThe authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s noteAll claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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