Weight distribution influences the time required to lift the leg even under normal standing condition

Shinya, Masahiro; Yamada, Yōko; Oda, Shingo

doi:10.1016/j.gaitpost.2009.01.005

Cited by 4 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect was associated with pre-step lowerlimb unloading along with the knee extension movement at step initiation that resulted in shorter step-limb unloading time than the NP condition. Since the time to unload and lift the limb is shortened when the load is increased on the support leg (Patchay and Gahery, 2003;Aruin, 2006;Azuma et al, 2007;Shinya et al, 2009), preparatory bilateral knee extension movement appeared to assist unloading of the stepping limb by reducing the time to lift-off. Forward or backward stepping are preceded by anticipatory postural adjustments (APAs) for lateral weight transfer involving step-limb loading and stance-limb unloading prior to step lift-off (Lepers and Breniere, 1995;Tateuchi et al, 2011;Sparto et al, 2014).…”

Section: Figure | Representative Time-history Plots Of Mediolateral and Vertical Grfs In (A) Np Condition And (B) P Condition (Ee Conditimentioning

confidence: 99%

“…The ability to perform alterations in body weight support between the lower limbs is a fundamental component of wholebody human movement (Patla et al, 1993;Patchay and Gahery, 2003;Shinya et al, 2009;Mille et al, 2014;Sparto et al, 2014). For example, postural transitions from bipedal to single limb stance involve lower-limb loading and unloading during lateral weight transfer that accompany a variety of goal-directed actions, including the initiation of stepping, ongoing walking, athletic agility maneuvers, and hitting and throwing sports activities (e.g., basketball, tennis, baseball, and field events) (Uzu et al, 2009;Fujii et al, 2013;Mille et al, 2014;Müller et al, 2014;Ibrahim et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…To rapidly lift and advance the stepping limb from a stationary standing position, body weight support must be stably redistributed between the lower limbs to allow limb withdrawal (Patla et al, 1993;Patchay and Gahery, 2003;Shinya et al, 2009;Sparto et al, 2014). Hence, interlimb neuromotor coordination of postural (single limb extension support) and intended movement (flexion-abduction limb withdrawal) actions reflected in the kinetic patterns of limb loading forces is a fundamental requirement of rapid sidestepping performance (Patla et al, 1993;Sparto et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Because step initiation and execution require unloading of the stepping limb and increased loading of the single stance limb, the initial conditions of limb loading preceding a step can either facilitate or impede stepping. Hence, pre-step conditions of limb loading that reduce or increase step-limb loading, respectively shorten and delay movement initiation (Patchay and Gahery, 2003;Aruin, 2006;Azuma et al, 2007;Shinya et al, 2009;Mille et al, 2014) and can affect the spatiotemporal characteristics of first step execution (Mille et al, 2014). For instance, changing the level of pre-step limb loading through continuous alteration of bilateral knee flexion-extension movements can shorten rapid step initiation onset timing during limb unloading below 80% of body weight and delay sidestepping initiation time above 120% of body weight (Fujii et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Preparatory Knee Flexion-Extension Movements Enhance Rapid Sidestepping Performance in Collegiate Basketball Players

Fujimoto

Uchida

Nagano

et al. 2021

Front. Sports Act. Living

View full text Add to dashboard Cite

Lower-limb weight-bearing load distribution in stationary standing influences the timing of rapid first step initiation of importance for functional movement activities and agility performance in sports. This study investigated the effect of pre-step lower-limb loading and unloading with preparatory knee flexion-extension movements on sidestepping performance in fifteen male collegiate basketball players. Participants performed two-choice (step limb) reaction time sidestepping under two conditions: without preparatory movements before the go cue (no-prep–NP) and with continuous alternating knee extension and flexion movements (prep–P). The reaction signal was provided at the beginning of knee extension and flexion and during these movements which corresponded with the largest and smallest loading instants and the transition states between those instants. Sidestepping performance was assessed with three-dimensional kinematic data and ground reaction forces. Step initiation onset time was significantly faster by 13–15% than the NP condition when initiated in the knee flexion phase (p ≤ 0.028, r ≥ 0.70), whereas step-limb unloading interval from step initiation to step lift-off was significantly faster by 12–15% in the knee extension phase (p ≤ 0.01, r ≥ 0.74). The preparatory movements significantly shortened step lift-off by 10–12% (p ≤ 0.013, r ≥ 0.73) and step duration by 17–21% (p < 0.001, r ≥ 0.85) with 19–22% faster step velocity (p < 0.001, r ≥ 0.84), which resulted in 14–15% shorter overall time to step landing (p < 0.001, r ≥ 0.84), irrespective of the loading phases. These results indicated that lower-limb loading with pre-step knee flexion facilitated faster step initiation, while lower-limb unloading with knee extension facilitated faster step-limb unloading, both resulting in faster step lift-off. Bilateral knee flexion-extension movements as a preparatory action could be utilized by invasion sports players to facilitate reactive stepping performance for more effective movement initiation.

show abstract

Section: Figure | Representative Time-history Plots Of Mediolateral and Vertical Grfs In (A) Np Condition And (B) P Condition (Ee Conditimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparatory Knee Flexion-Extension Movements Enhance Rapid Sidestepping Performance in Collegiate Basketball Players

Fujimoto

Uchida

Nagano

et al. 2021

Front. Sports Act. Living

View full text Add to dashboard Cite

show abstract

Performance monitoring and response conflict resolution associated with choice stepping reaction tasks

et al. 2016

View full text Add to dashboard Cite

Choice reaction requires response conflict resolution, and the resolution processes that occur during a choice stepping reaction task undertaken in a standing position, which requires maintenance of balance, may be different to those processes occurring during a choice reaction task performed in a seated position. The study purpose was to investigate the resolution processes during a choice stepping reaction task at the cortical level using electroencephalography and compare the results with a control task involving ankle dorsiflexion responses. Twelve young adults either stepped forward or dorsiflexed the ankle in response to a visual imperative stimulus presented on a computer screen. We used the Simon task and examined the error-related negativity (ERN) that follows an incorrect response and the correct-response negativity (CRN) that follows a correct response. Error was defined as an incorrect initial weight transfer for the stepping task and as an incorrect initial tibialis anterior activation for the control task. Results revealed that ERN and CRN amplitudes were similar in size for the stepping task, whereas the amplitude of ERN was larger than that of CRN for the control task. The ERN amplitude was also larger in the stepping task than the control task. These observations suggest that a choice stepping reaction task involves a strategy emphasizing post-response conflict and general performance monitoring of actual and required responses and also requires greater cognitive load than a choice dorsiflexion reaction. The response conflict resolution processes appear to be different for stepping tasks and reaction tasks performed in a seated position.

show abstract

Effects of visual interference on initial motor program errors and execution times in the choice step reaction

Uemura¹,

Oya²,

Uchiyama³

2013

Gait & Posture

View full text Add to dashboard Cite

Weight distribution influences the time required to lift the leg even under normal standing condition

Cited by 4 publications

References 17 publications

Preparatory Knee Flexion-Extension Movements Enhance Rapid Sidestepping Performance in Collegiate Basketball Players

Preparatory Knee Flexion-Extension Movements Enhance Rapid Sidestepping Performance in Collegiate Basketball Players

Performance monitoring and response conflict resolution associated with choice stepping reaction tasks

Effects of visual interference on initial motor program errors and execution times in the choice step reaction

Contact Info

Product

Resources

About