Adjustments after an ankle dorsiflexion perturbation during human running

Scohier, Mikaël; Jaeger, Dominique De; Schepens, Bénédicte

doi:10.1016/j.gaitpost.2011.07.019

Cited by 6 publications

(3 citation statements)

References 28 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…EMG amplitudes were higher in response to the perturbations in the leading leg, when compared to the trailing leg (see Figures 3 , 4 ). This supports previous studies which have investigated muscle activity and changes in kinematics during perturbed running ( 19 , 28 , 36 ). The trailing leg is known to play a role in the maintenance of balance during perturbed walking ( 51 , 58 ), and the results of the current study suggest that it is also active during running perturbations; whilst to a lesser extent than the leading leg.…”

Section: Discussionsupporting

confidence: 92%

“…Consequently, an investigation into the electromyographic (EMG) profiles of the lower-limb musculature in response to perturbed running could reveal useful information on the motor control strategies of humans. EMG is capable of characterising human performance via the capture of muscle activity during different movement tasks ( 35 ), and enables unique understanding of motor control during human gait, for example in the study of inter-limb and inter-muscle coordination ( 11 , 23 , 36 ), muscle synergies ( 30 ), and neuromuscular reflex responses ( 23 , 30 , 37 , 38 ). Investigation of reflex responses may be particularly relevant in the comprehension of fall risk and associated injury ( 2 , 4 ), and increased understanding could help in the mitigation of this risk by informing training and rehabilitation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unexpected running perturbations: Reliability and validity of a treadmill running protocol with analysis of provoked reflex activity in the lower extremities

Quarmby

Khajooei

Kurtz

et al. 2023

Front. Sports Act. Living

View full text Add to dashboard Cite

IntroductionBalance is vital for human health and experiments have been conducted to measure the mechanisms of postural control, for example studying reflex responses to simulated perturbations. Such studies are frequent in walking but less common in running, and an understanding of reflex responses to trip-like disturbances could enhance our understanding of human gait and improve approaches to training and rehabilitation. Therefore, the primary aim of this study was to investigate the technical validity and reliability of a treadmill running protocol with perturbations. A further exploratory aim was to evaluate the associated neuromuscular reflex responses to the perturbations, in the lower limbs.MethodsTwelve healthy participants completed a running protocol (9 km/h) test-retest (2 weeks apart), whereby 30 unilateral perturbations were executed via the treadmill belts (presets:2.0 m/s amplitude;150 ms delay (post-heel contact);100ms duration). Validity of the perturbations was assessed via mean ± SD comparison, percentage error calculation between the preset and recorded perturbation characteristics (PE%), and coefficient of variation (CV%). Test-retest reliability (TRV%) and Bland-Altman analysis (BLA; bias ± 1.96 * SD) was calculated for reliability. To measure reflex activity, electromyography (EMG) was applied in both legs. EMG amplitudes (root mean square normalized to unperturbed strides) and latencies [ms] were analysed descriptively.ResultsLeft-side perturbation amplitude was 1.9 ± 0.1 m/s, delay 105 ± 2 ms, and duration 78 ± 1 ms. Right-side perturbation amplitude was 1.9 ± 0.1 m/s, delay 118 ± 2 ms, duration 78 ± 1 ms. PE% ranged from 5–30% for the recorded perturbations. CV% of the perturbations ranged from 19.5–76.8%. TRV% for the perturbations was 6.4–16.6%. BLA for the left was amplitude: 0.0 ± 0.3m/s, delay: 0 ± 17 ms, duration: 2 ± 13 ms, and for the right was amplitude: 0.1 ± 0.7, delay: 4 ± 40 ms, duration: 1 ± 35 ms. EMG amplitudes ranged from 175 ± 141%–454 ± 359% in both limbs. Latencies were 109 ± 12–116 ± 23 ms in the tibialis anterior, and 128 ± 49-157 ± 20 ms in the biceps femoris.DiscussionGenerally, this study indicated sufficient validity and reliability of the current setup considering the technical challenges and limitations, although the reliability of the right-sided perturbations could be questioned. The protocol provoked reflex responses in the lower extremities, especially in the leading leg. Acute neuromusculoskeletal adjustments to the perturbations could be studied and compared in clinical and healthy running populations, and the protocol could be utilised to monitor chronic adaptations to interventions over time.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Unexpected running perturbations: Reliability and validity of a treadmill running protocol with analysis of provoked reflex activity in the lower extremities

Quarmby

Khajooei

Kurtz

et al. 2023

Front. Sports Act. Living

View full text Add to dashboard Cite

show abstract

“…In this study, the right hip average flexion max increased and the knee average flexion min decreased after nine minutes of running, which may help the runners maintain the same leg stiffness during fifteen minutes of running to adapt to the constant running speed of the treadmill. In addition, a previous study found that runners who increased the dorsiflexion angle of their right ankle by approximately 5° at any time with mechanical perturbation could still adjust their running patterns and maintain stability with a time-dependent adaptive strategy [ 20 ]. In this study, the right/left ankle average dorsiflexion max increased after nine minutes of running time, which may be the safety strategy adopted by the runners to maintain the constant speed given by the treadmill.…”

Section: Discussionmentioning

confidence: 99%

Effect of wearing medical protective masks on treadmill running performance in the postpandemic era: a randomised trial

Wang

Sui²,

Yao³

et al. 2023

BMC Sports Sci Med Rehabil

View full text Add to dashboard Cite

Background In the postpandemic era, wearing protective masks in public places will still be an important means of blocking popular viruses in the future. The purpose of this study was to explore whether sports performance was affected by mask wearing and exercise duration during 15-min treadmill running at a speed of 75% maximal aerobic speed. Methods Thirty-six males were randomly divided into mask and nonmask groups. The kinematic and kinetic data were obtained at four time points (RN0–1 min, RN5–6 min, RN9–10 min, and RN14–15 min) during running. Two-way mixed ANOVA was applied to examine the effects between groups and times with Bonferroni post hoc comparison and independent samples t-test. Results The results showed that there was no difference between mask and nonmask group during running (p > 0.05). As running time increased, hip joint ROM, hip joint flexion/extension max, and ankle joint plantarflexion max angles increased; knee joint flexion min and ankle joint dorsiflexion max angles decreased; average peak vertical ground reaction forces (PVGRF) increased after 9 min-running (p < 0.05). Conclusions Wearing a medical protective mask does not affect the joint angle and touchdown PVGRF of lower extremities during treadmill running while affected by running time and changed after 9 min-treadmill running. Future studies will examine the effects of wearing masks during the pandemic on muscle activation and blood biochemical values during exercise. Trial registration No. ChiCTR2000040535 (date of registration on December 1, 2020). Prospectively registered in the Chinese Clinical Trial Registry.

show abstract

Review of balance recovery in response to external perturbations during daily activities

Tokur

Grimmer

Seyfarth

2020

Human Movement Science

View full text Add to dashboard Cite

Adjustments after an ankle dorsiflexion perturbation during human running

Cited by 6 publications

References 28 publications

Unexpected running perturbations: Reliability and validity of a treadmill running protocol with analysis of provoked reflex activity in the lower extremities

Unexpected running perturbations: Reliability and validity of a treadmill running protocol with analysis of provoked reflex activity in the lower extremities

Effect of wearing medical protective masks on treadmill running performance in the postpandemic era: a randomised trial

Review of balance recovery in response to external perturbations during daily activities

Contact Info

Product

Resources

About