Muscle activity and balance control during sit-to-stand across symmetric and asymmetric initial foot positions in healthy adults

Jeon, Woohyoung; Jensen, Jody L.; Griffin, Lisa

doi:10.1016/j.gaitpost.2019.04.030

Cited by 40 publications

(29 citation statements)

References 34 publications

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“…We determined the effects of age on STS muscle activation during the initial-stage of the rSTS series. In agreement with previous data, the activation of knee extensors and dorsiflexors was 70–80% higher than other muscle groups ( Figure 3 ), suggesting strong muscle activation during STS (Jeon et al, 2019 ). As expected, older vs. younger adults rose from the chair with a higher, earlier, and longer muscle activation pattern.…”

Section: Discussionsupporting

confidence: 93%

“…As expected, older vs. younger adults rose from the chair with a higher, earlier, and longer muscle activation pattern. The age-specific 65–90% greater knee extensor activation preferentially helps older adults to accelerate the center of mass (CoM) upward (Bryanton and Bilodeau, 2017 , 2019 ; Jeon et al, 2019 ). Such strong activation of the knee extensors may be needed because MVIF was 35% lower in older than younger adults ( Figure 2 ) and the activation demand can be as high as 90% of the maximum during ascent (Hortobágyi et al, 2003 ).…”

Section: Discussionmentioning

confidence: 99%

“…A new observation was that dorsiflexor activation amplitude was over two times higher in older vs. younger adults to rise from a chair, which may indicate a strategy to increase stability. The dorsiflexors control the center of pressure (CoP) under the limits of stability by keeping its position close to the CoM and stabilize the ankle joint (Jeon et al, 2019 ). Age-specific strategy is also reflected by the 80% earlier onset of the hip stabilizers compared to plantar and knee flexors in older adults only ( Figure 4A ).…”

Section: Discussionmentioning

confidence: 99%

“…Rising from and sitting down in a chair is a demanding task, as it requires high levels of knee joint torques, substantial joint excursions, inter-joint coordination, and balance (Hortobágyi et al, 2003 ; Netz et al, 2004 ; Alcazar et al, 2018 ; Jeon et al, 2019 ). Decreases in muscle strength and posture control make it especially challenging for older adults to execute the sit-to-stand task (STS) (Hurley et al, 2016 ; Bryanton and Bilodeau, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Older Compared With Younger Adults Performed 467 Fewer Sit-to-Stand Trials, Accompanied by Small Changes in Muscle Activation and Voluntary Force

Santos

Lamoth

Gobbi

et al. 2021

Front. Aging Neurosci.

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Background: Repetitive sit-to-stand (rSTS) is a fatigue perturbation model to examine the age-effects on adaptability in posture and gait, yet the age-effects on muscle activation during rSTS per se are unclear. We examined the effects of age and exhaustive rSTS on muscle activation magnitude, onset, and duration during ascent and descent phases of the STS task.Methods: Healthy older (n = 12) and younger (n = 11) adults performed rSTS, at a controlled frequency dictated by a metronome (2 s for cycle), to failure or for 30 min. We assessed muscle activation magnitude, onset, and duration of plantar flexors, dorsiflexors, knee flexors, knee extensors, and hip stabilizers during the initial and late stages of rSTS. Before and after rSTS, we measured maximal voluntary isometric knee extension force, and rate of perceived exertion, which was also recorded during rSTS task.Results: Older vs. younger adults generated 35% lower maximum voluntary isometric knee extension force. During the initial stage of rSTS, older vs. younger adults activated the dorsiflexor 60% higher, all 5 muscle groups 37% longer, and the hip stabilizers 80% earlier. Older vs. younger adults completed 467 fewer STS trials and, at failure, their rate of perceived exertion was ~17 of 20 on the Borg scale. At the end of the rSTS, maximum voluntary isometric knee extension force decreased 16% similarly in older and younger, as well as the similar age groups decline in activation of the dorsiflexor and knee extensor muscles (all p < 0.05).Conclusion: By performing 467 fewer STS trials, older adults minimized the potential effects of fatigability on muscle activation, voluntary force, and motor function. Such a sparing effect may explain the minimal changes in gait after rSTS reported in previous studies, suggesting a limited scope of this perturbation model to probe age-effects on muscle adaptation in functional tasks.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Older Compared With Younger Adults Performed 467 Fewer Sit-to-Stand Trials, Accompanied by Small Changes in Muscle Activation and Voluntary Force

Santos

Lamoth

Gobbi

et al. 2021

Front. Aging Neurosci.

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“…In the present study, the head velocity and For-Back and Med-Lat weight translation rates were reduced in the asymmetrical foot position. This is similar to the increased body stability after STS in an asymmetrical foot position [32]. This indicates that an asymmetrical posture with the dominant foot behind increases the activity of the muscles of the lower extremity, generating sufficient force and increasing the stability.…”

Section: Discussionsupporting

confidence: 69%

Standing Up from a Chair with an Asymmetrical Initial Foot Position Decreases Trunk and Masticatory Muscle Activities in Healthy Young Men

Bae

2020

Healthcare

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This study aimed to identify the activation of lower extremity, trunk, and masticatory muscle and trunk kinematics of the initial foot position during the sit-to-stand (STS) movement. Sixteen young men participated in this cross-sectional pilot study and performed STS using both symmetrical and asymmetrical foot positions. Activation of the tibialis anterior (TA), gastrocnemius lateral head (GA), rectus femoris (RF), biceps femoris (BF), rectus abdominis, erector spinae (ES), sternocleidomastoid (SCM), upper trapezius (UT), temporalis (TE), and masseter muscles in the dominant side was determined. For trunk kinematics, head and trunk velocities, front-back (For-Back) and mediolateral (Med-Lat) weight translation rates, and trunk inclination were measured. GA, TA, BF, and RF activation significantly increased, whereas ES, SCM, UT, and TE activation significantly decreased when using the asymmetrical foot position. Head velocity, For-Back, Med-Lat, and trunk inclination were also significantly decreased. In conclusion, the asymmetrical foot position increases muscle activation in the lower extremities and decreases trunk inclination. In addition, ES, UT, and TE muscle activity decreases at the initial asymmetrical foot position.

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The Child with Bilateral Spastic Cerebral Palsy

Giannoni

Zerbino

2022

Cerebral Palsy

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Muscle activity and balance control during sit-to-stand across symmetric and asymmetric initial foot positions in healthy adults

Cited by 40 publications

References 34 publications

Older Compared With Younger Adults Performed 467 Fewer Sit-to-Stand Trials, Accompanied by Small Changes in Muscle Activation and Voluntary Force

Older Compared With Younger Adults Performed 467 Fewer Sit-to-Stand Trials, Accompanied by Small Changes in Muscle Activation and Voluntary Force

Standing Up from a Chair with an Asymmetrical Initial Foot Position Decreases Trunk and Masticatory Muscle Activities in Healthy Young Men

The Child with Bilateral Spastic Cerebral Palsy

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