The influence of knee extensor fatigue on lower extremity muscle activity during chair rise in young and older adults

Bryanton, Megan A.; Beznoska, Martin

doi:10.1007/s00421-018-3999-4

Cited by 11 publications

(11 citation statements)

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“…For example, an increased contribution of synergist muscles (e.g. ankle plantar flexor and hip extensor musculature) and a reduced knee moment arm during the push off phase have been found under fatigue conditions in young and older adults [42,43]. It should be noted that larger effect sizes on neuromuscular fatigue were found for HL whereas, conversely, larger effect size on functional performance decline were found after LL, although differences between loading conditions were not statistically significant.…”

Section: Discussionmentioning

confidence: 93%

Acute Physiological Response to Light- and Heavy-load Power-oriented Exercise in Older Adults

et al. 2021

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This study investigated the acute responses to volume-load-matched heavy-load (80% 1RM) versus light-load (40% 1RM) power-oriented resistance training sessions in well-functioning older adults. Using a randomized cross-over design, 15 volunteers completed each condition on a leg press. Neuromuscular (maximal isometric force and rate of force development) and functional performance (power during sit-to-stand test), lactate, and muscle damage biochemistry (creatine kinase, lactate dehydrogenase and C-reactive protein serum concentration) were assessed pre- and post-exercise. Performance declines were found after heavy-load (Cohen’s d effect size (d); maximal isometric force=0.95 d; rate of force development=1.17 d; sit-to-stand power =0.38 d, all p<0.05) and light-load (maximal isometric force=0.45 d; rate of force development=0.9 d; sit-to-stand power=1.17 d, all p<0.05), while lactate concentration increased only after light-load (1.7 d, p=0.001). However, no differences were found between conditions (all p>0.05). Both conditions increased creatine kinase the day after exercise (marginal effect=0.75 d, p<0.001), but no other blood markers increased (all, p>0.05). Irrespective of the load used, power training induced non-clinically significant decreases in sit-to-stand performance, moderate declines in maximal isometric force, but pronounced decreases in the rate of force development. Furthermore, the metabolic stress and muscle damage were minor; both sessions were generally well tolerated by well-functioning older adults without previous experience in resistance training.

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Section: Discussionmentioning

confidence: 93%

Acute Physiological Response to Light- and Heavy-load Power-oriented Exercise in Older Adults

et al. 2021

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“…Muscle performance fatigability can modify muscle activation in single joint tasks and also during gait. For example, decreases in level of force delayed muscle activation onset in older adults while rising from a chair [31]. After ankle muscle fatigability, coactivation of agonist and antagonist ankle muscles increased by ~12% during gait and there was 41% delay in a functional reflex when older adults were prompted to respond to gait perturbations [27].…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, it is likely that older adults would in compensation for the force loss increase stride width and muscle activity to increase gait stability [25]. Subtler mechanisms could involve increases in the activity of antagonist muscles and distribute effort by recruiting less affected muscles at adjacent joints [28,30,31]. Concerning mental fatigability, we expect that interference with attention, arousal, executive function, mood, and motivation would primarily affect gait variability [32,33].…”

Section: Introductionmentioning

confidence: 99%

Effects of experimentally induced fatigue on healthy older adults’ gait: A systematic review

et al. 2019

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IntroductionWhile fatigue is ubiquitous in old age and visibly interferes with mobility, studies have not yet examined the effects of self-reported fatigue on healthy older adults’ gait. As a model that simulates this daily phenomenon, we systematically reviewed eleven studies that compared the effects of experimentally induced muscle and mental performance fatigability on gait kinematics, variability, kinetics, and muscle activity in healthy older adults.MethodsWe searched for studies in databases (PubMed and Web of Science) using Fatigue, Gait, and Clinical conditions as the main terms and extracted the data only from studies that experimentally induced fatigue by sustained muscle or mental activities in healthy older adults.ResultsEleven studies were included. After muscle performance fatigability, six of nine studies observed increases in stride length, width, gait velocity (Effect Size [ES] range: 0.30 to 1.22), inter-stride trunk acceleration variability (ES: 2.06), and ankle muscle coactivation during gait (ES: 0.59, n = 1 study). After sustained mental activity, the coefficient of variation of stride outcomes increased (ES: 0.59 to 0.67, n = 1 study) during dual-task but not single-task walking.ConclusionMuscle performance fatigability affects spatial and temporal features of gait and, mainly, inter-stride trunk acceleration variability. In contrast, sustained mental activity tends only to affect step variability during dual tasking. A critical and immediate step for future studies is to determine the effects of self-reported fatigue on gait biomechanics and variability in healthy older adults to verify the viability of experimentally induced fatigue as a model for the study of gait adaptability in old age.

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“…Secondly, this study aimed to determine the effects of age and fatigue induced by rSTS on muscle activation during the initial and late-stages of STS. Given existing literature (Bryanton and Bilodeau, 2019), we expected an increase in muscle amplitude in the primary agonist knee extensors and in muscles that show low activation at the start of the STS series. Because of the age-typical neuromuscular decline (Gross et al, 1998;Hortobágyi et al, 2003;Hurley et al, 2016;Bryanton and Bilodeau, 2017), we expected a compensatory agespecific increases in muscle activation amplitude and duration after the execution of rests.…”

Section: Introductionmentioning

confidence: 99%

“…During the STS task, older adults, in particular, tend to strongly activate the knee (e.g., rectus femoris - RF, vastus lateralis - VL, biceps femoris - BF), ankle (e.g. tibialis anterior – TA, gastrocnemius - GAS), and hip muscles (e.g., gluteus medius - Glu) (Hortobágyi et al, 2003 ; Jang and Yoo, 2015 ; Bryanton and Bilodeau, 2017 , 2019 ; van der Kruk et al, 2021 ) to compensate the deficits in muscles strength (van der Kruk et al, 2021 ). The high mechanical load at the knee and the strong activation of the knee extensors may require some older adults to use up to 95% of the maximal capacity compared to 30–50% in younger adults (Hortobágyi et al, 2003 ; Bryanton and Bilodeau, 2017 , 2019 ).…”

Section: Introductionmentioning

confidence: 99%

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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The influence of knee extensor fatigue on lower extremity muscle activity during chair rise in young and older adults

Cited by 11 publications

References 53 publications

Acute Physiological Response to Light- and Heavy-load Power-oriented Exercise in Older Adults

Acute Physiological Response to Light- and Heavy-load Power-oriented Exercise in Older Adults

Effects of experimentally induced fatigue on healthy older adults’ gait: A systematic review

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

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