Carrying asymmetric loads during stair negotiation: Loaded limb stance vs. unloaded limb stance

Wang, Junsig; Gillette, Jason C.

doi:10.1016/j.gaitpost.2018.06.113

Cited by 7 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our hypothesis that hip abduction moments would incrementally increase with load in both stance phases of a step-up task was not supported. Contrary to our results, significant increases in hip abduction moments between no-load and +20% of BW have been quantified during the initial step up in adults (Wang and Gillette, 2018). Hip abductor muscle activations have also been shown to significantly increase between -30% of body weight and no-load during regular gait (Mun et al, 2017).…”

Section: Discussioncontrasting

confidence: 99%

“…The evidence is less robust for the effect of body weight modulation on the initiation of stair ascent. Researchers have postulated the importance of analyzing this specific movement because the first step up requires larger lower limb joint moments compared to subsequent steps (Wang and Gillette, 2018). This analysis may be especially important for pediatric clinical populations, for which a single step up can be a sensitive measure of movement quality (Stania et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The handful of studies that have investigated lower limb moments of a step-up task have all been in adults, and even fewer studies have explored the effect of load modulation (Goyal et al, 2022; Wang and Gillette, 2018). It has been confirmed that substantial hip abduction moments are necessary to maintain mediolateral stability and considerable sagittal plane extensor moments are required to keep the body upright in adults (Goyal et al, 2022; Novak and Brouwer, 2011; Wang and Gillette, 2018). There is a need for a robust biomechanical model defining how these joint moments change across multiple load conditions in a typical pediatric population, especially during single limb stance where upright stability is most critical.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Load modulation affects pediatric lower limb joint moments during a step-up task

Goyal,

Gordon,

Sukal-Moulton

2023

Preprint

View full text Add to dashboard Cite

Performance in a single step has been suggested to be sensitive measure of movement quality in pediatric clinical populations. Although there is less information available in children with typical development, researchers have postulated the importance of analyzing the effect of body weight modulation on the initiation of stair ascent, especially during single limb stance where upright stability is most critical. The purpose of this study was to investigate the effect of load modulation from -20% to +15% of body weight on typical pediatric lower limb joint moments during a step-up task. Fourteen participants between 5-21 years with no known history of neurological or musculoskeletal concerns were recruited to perform multiple step-up trials. Peak extensor support and hip abduction moments were identified during the push-off and pull-up stance phases. Linear regressions were used to determine the relationship between peak moments and load. Mixed effects models were used to estimate the effect of load on hip, knee, and ankle percent contributions to peak support moments. There was a positive linear relationship between peak support moments and load in both stance phases, where these moments scaled with load. There was no relationship between peak hip abduction moments and load. While the ankle and knee were the primary contributors to the support moments, the hip contributed more than expected in the pull-up phase. Clinicians can use these results to contextualize movement differences in pediatric clinical populations including cerebral palsy and highlight potential target areas for rehabilitation for populations such as adolescent athletes.

show abstract

Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Load modulation affects pediatric lower limb joint moments during a step-up task

Goyal,

Gordon,

Sukal-Moulton

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Previous studies have indicated that asymmetric load carriage resulted in significant differences in lower extremity joint moments between loaded and unloaded limbs during walking (DeVita et al, 1991;Matsuo et al, 2008) and stair negotiation (Wang and Gillette, 2018a). These differences are likely due to a larger moment arm from the load to the stance leg on the opposite side of the body.…”

Section: Introductionmentioning

confidence: 99%

Mediolateral postural stability when carrying asymmetric loads during stair negotiation

Wang

Gillette

2020

Applied Ergonomics

Self Cite

View full text Add to dashboard Cite

The purpose of this study was to assess postural stability in the medial-lateral (ML) direction when carrying unilateral and bilateral loads during stair negotiation. Twenty-four healthy young adults were instructed to ascend and descend a three step staircase under three load conditions: no load, 20% body mass (BM) bilateral load, and 20% BM unilateral load. A modified time-to-contact (TTC) method was proposed to evaluate postural stability during stair negotiation. Carrying unilateral loads required more rapid postural adjustments as evidenced by lower minimum ML TTC and ML TTC percentage as compared bilateral loads and no load during stair descent. In addition, lower ML TTC and TTC percentage were found for loaded limb stance for stair descent. Taken together, unilateral loads and the loaded leg during stair descent are of concern when considering postural stability during load carriage. These results illustrate differing postural control challenges for stair ascent and descent during load carriage.

show abstract

“…Nevertheless, this analysis did not consider the substantial hip and knee flexion angles required to swing the limb onto the step or the extensor/adductor torque coupling that could explain decreases in hip abduction torque generation. Additionally, the authors focused on biomechanics of the second step, whereas the higher hip abduction moments required to transition from standing or level walking to stair ascent [17] make the first step likely more difficult post-stroke. These considerations may reveal the limits of lower extremity neuromuscular control.…”

Section: Introductionmentioning

confidence: 99%

Altered biomechanical strategies of the paretic hip and knee joints during a step-up task: a pilot study

Goyal¹,

Dragunas²,

Askew

et al. 2020

Preprint

View full text Add to dashboard Cite

BackgroundStroke often leads to chronic, neural-derived motor impairments in the paretic lower limb, such as weakness, abnormal extensor torque coupling, and reduced ranges of motion. These impairments can constrain lower extremity movement and negatively impact the ability to navigate uneven terrain. Quantification of biomechanical strategies used by individuals with chronic stroke to step up would offer insight into the neural consequences of a stroke.Research QuestionWhat are the altered kinetic and kinematic strategies of the leading paretic hip and knee joints while swinging and pulling-up onto a step?MethodsA total of 10 participants were included in this mixed design study: 5 adults with hemiparetic stroke and 5 age-matched adults without stroke. Participants were instructed to step up onto a 4-inch platform, where joint kinetic and kinematics of the hip in the frontal plane and the hip and knee in the sagittal plane were quantified. A mixed effects linear regression model with two fixed effects of group (stroke and control) and lower limb (LL: dominant/non-paretic and non-dominant/paretic) was used to compare peak joint torques and angles. Another mixed effects model with two fixed effects of peak hip and knee extension torque was used to investigate whether these main effects could predict peak hip abduction torque.ResultsAltered biomechanical strategies of the paretic limb for step ascent included reduced sagittal plane flexion angles during swing, reduced hip abduction and knee extension torque combined with increased hip extension torque during pull-up stance, and abnormal torque coupling between the hip adductors and sagittal plane extensors.SignificanceThese differences can be linked to the neural consequences of a hemiparetic stroke, including corticospinal damage and upregulation of bulbospinal pathways as compensation. Overall, our findings can inform interventions for individuals with chronic stroke in navigating uneven terrain to maximize daily community activity.

show abstract

Carrying asymmetric loads during stair negotiation: Loaded limb stance vs. unloaded limb stance

Abstract: General load carriage recommendations include carrying less than 20% BW loads and splitting loads bilaterally when feasible. Assessment recommendations include analyzing the first stair step and analyzing both the loaded and unloaded limbs.

Cited by 7 publications

References 28 publications

Load modulation affects pediatric lower limb joint moments during a step-up task

Load modulation affects pediatric lower limb joint moments during a step-up task

Mediolateral postural stability when carrying asymmetric loads during stair negotiation

Altered biomechanical strategies of the paretic hip and knee joints during a step-up task: a pilot study

Contact Info

Product

Resources

About