Knee Extensor Fatigue Threshold Is Related to Whole-Body V˙O2max

Ruiter, C.J. de; Maas, Ellen; Wesseling, Mariska; Haan, A. de

doi:10.1249/mss.0b013e318249d701

Cited by 6 publications

(6 citation statements)

References 33 publications

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“…Additionally, it has been shown in the knee extensors that myoelectric manifestations of fatigue are only seen when the exertion exceeds 40% of the MVC (de Ruiter et al. ). Two exercises in a study by Plamondon et al.…”

Section: Discussionmentioning

confidence: 99%

“…This could be explained partly by recent studies which have demonstrated that frequency variables, including MNF, do not accurately predict motor unit recruitment during contractions (Merletti & Farina, 2016;Vecchio et al 2017). Additionally, it has been shown in the knee extensors that myoelectric manifestations of fatigue are only seen when the exertion exceeds 40% of the MVC (de Ruiter et al 2012). Two exercises in a study by Plamondon et al (2002) were similar in position and function to the Ito test; in that study, these exercises were found to be between 26 and 32% of a participant's MVC.…”

Section: Endurance and Fatiguementioning

confidence: 97%

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Variation in the spatial distribution of erector spinae activity during a lumbar endurance task in people with low back pain

et al. 2019

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This study aimed to investigate the spatial distribution and redistribution of lumbar erector spinae (ES) activity during a lumbar extension endurance task in pain‐free participants and how this is modified in people with low back pain (LBP). High density surface electromyography (HDEMG) was recorded using 13 × 5 electrode grids placed over the lumbar ES in 13 LBP and 13 control participants while completing an Ito test to task failure. The root mean square of the HDEMG signals was computed, a topographical map of the EMG amplitude generated and the centre of the activity (centroid) determined throughout the task. The centroid of the EMG amplitude map was systematically more cranial (F = 6.09, P = 0.022) for the LBP participants compared with the control subjects. Regression analysis showed that the extent of redistribution of ES activity was associated with longer endurance. These results show that LBP participants utilised a different motor strategy to perform the endurance task, characterised by greater activation of more cranial regions of the ES and less redistribution of ES activity throughout the task. This study provides new insight into the functional activation of the lumbar ES and how it is modified when people have pain.

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Section: Discussionmentioning

confidence: 99%

Section: Endurance and Fatiguementioning

confidence: 97%

Variation in the spatial distribution of erector spinae activity during a lumbar endurance task in people with low back pain

et al. 2019

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“…One may reduce effects of ATT on the amplitude of [HHbMb] and [O 2 HbMb] signals by normalizing oxygenation changes to the oxygenation at peak exercise [ 10 , 27 ], maximal voluntary contraction [ 26 , 28 ] or cuff occlusion [ 21 , 26 ]. Still, this correction does not account for the evident asymmetry in Δ[O 2 HbMb] and Δ[HHbMb] amplitude.…”

Section: Discussionmentioning

confidence: 99%

“…Also, it is well-known that scattering and absorbance due to adipose tissue affect NIRS signals, reducing absorbance by underlying muscle tissue [ 24 – 26 ]. One may reduce these effects of ATT by normalizing oxygenation changes to the oxygenation at peak exercise [ 10 , 27 ], maximal voluntary contraction [ 26 , 28 ] or cuff occlusion [ 21 , 26 ], where the effect of ATT on the amplitude of separate [O 2 HbMb] and [HHbMb] signals can be assessed in the absence of blood volume changes.…”

Section: Introductionmentioning

confidence: 99%

Oxygenation Threshold Derived from Near-Infrared Spectroscopy: Reliability and Its Relationship with the First Ventilatory Threshold

et al. 2016

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BackgroundNear-infrared spectroscopy (NIRS) measurements of oxygenation reflect O2 delivery and utilization in exercising muscle and may improve detection of a critical exercise threshold.PurposeFirst, to detect an oxygenation breakpoint (Δ[O2HbMb-HHbMb]-BP) and compare this breakpoint to ventilatory thresholds during a maximal incremental test across sexes and training status. Second, to assess reproducibility of NIRS signals and exercise thresholds and investigate confounding effects of adipose tissue thickness on NIRS measurements.MethodsForty subjects (10 trained male cyclists, 10 trained female cyclists, 11 endurance trained males and 9 recreationally trained males) performed maximal incremental cycling exercise to determine Δ[O2HbMb-HHbMb]-BP and ventilatory thresholds (VT1 and VT2). Muscle haemoglobin and myoglobin O2 oxygenation ([HHbMb], [O2HbMb], SmO2) was determined in m. vastus lateralis. Δ[O2HbMb-HHbMb]-BP was determined by double linear regression. Trained cyclists performed the maximal incremental test twice to assess reproducibility. Adipose tissue thickness (ATT) was determined by skinfold measurements.ResultsΔ[O2HbMb-HHbMb]-BP was not different from VT1, but only moderately related (r = 0.58–0.63, p<0.001). VT1 was different across sexes and training status, whereas Δ[O2HbMb-HHbMb]-BP differed only across sexes. Reproducibility was high for SmO2 (ICC = 0.69–0.97), Δ[O2HbMb-HHbMb]-BP (ICC = 0.80–0.88) and ventilatory thresholds (ICC = 0.96–0.99). SmO2 at peak exercise and at occlusion were strongly related to adipose tissue thickness (r2 = 0.81, p<0.001; r2 = 0.79, p<0.001). Moreover, ATT was related to asymmetric changes in Δ[HHbMb] and Δ[O2HbMb] during incremental exercise (r = -0.64, p<0.001) and during occlusion (r = -0.50, p<0.05).ConclusionAlthough the oxygenation threshold is reproducible and potentially a suitable exercise threshold, VT1 discriminates better across sexes and training status during maximal stepwise incremental exercise. Continuous-wave NIRS measurements are reproducible, but strongly affected by adipose tissue thickness.

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“…Before beginning the exercise, the subjects performed a few repetitions of light intensity to warm-up. The exercise protocol consisted of 4 sets of seated knee extensions (30,15,15, and 15 reps), separated by 1-minute periods, with BFR applied throughout the sets and rests. It was based on the recommendations of previous studies examining the implementation into clinical practice of LL-BFR resistance training, its considerations of methodology, safety, and physiological responses (20,36,45), albeit we opted for 60 seconds rests instead of 30 seconds to minimize fatigue, discomfort, and to avoid possible adverse effects, as concerns have been raised regarding the potential risk for muscle damage and rhabdomyolysis with very strenuous and unaccustomed BFR exercise under some circumstances (45).…”

Section: Methodsmentioning

confidence: 99%

Neuromuscular Responses and Perceptions of Health Status and Pain-Related Constructs in End-Stage Knee Osteoarthritis During Resistance Training With Blood Flow Restriction

Ogrezeanu,

López-Bueno,

Sanchís-Sánchez

et al. 2023

Journal of Strength and Conditioning Research

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Ogrezeanu, DC, López-Bueno, L, Sanchís-Sánchez, E, Carrasco, JJ, Cuenca-Martínez, F, Suso-Martí, L, López-Bueno, R, Cruz-Montecinos, C, Martinez-Valdes, E, Casaña, J, and Calatayud, J. Neuromuscular responses and perceptions of health status and pain-related constructs in end-stage knee osteoarthritis during resistance training with blood flow restriction. J Strength Cond Res XX(X): 000–000, 2023—We aimed to evaluate the neuromuscular responses and their relationship with health status, kinesiophobia, pain catastrophizing, and chronic pain self-efficacy in patients with end-stage knee osteoarthritis during acute resistance training with different levels of blood flow restriction (BFR). Seventeen patients with end-stage knee osteoarthritis participated in 3 experimental sessions separated by 3 days, performing 4 sets of knee extensions with low load and 3 levels of concurrent BFR performed in a random order: control (no BFR), BFR at 40% arterial occlusion pressure (AOP), and BFR at 80% AOP. Normalized root-mean-square (nRMS), nRMS spatial distribution (centroid displacement, modified entropy, and coefficient of variation), and normalized median frequency (nFmed) were calculated from the vastus medialis (VM) and lateralis (VL) using high-density surface electromyography. Subjects were asked to report adverse effects after the sessions. In the VM, nRMS was higher with 80% AOP than with 40% AOP (p = 0.008) and control (p < 0.001), whereas there were no differences between conditions in the VL. Normalized root-mean-square also showed an association with pain catastrophizing, chronic pain self-efficacy, and health status (VM: −0.50, 0.49, −0.42; VL: −0.39, 0.27, −0.33). Spatial distribution varied between conditions but mostly in the VL. Overall, nFmed did not vary, with only a slight increase in the VL with 40% AOP, between set 3 and 4. BFR during knee extensions at 80% AOP increases VM activity and VL amplitude distribution more than 40% AOP and control. Importantly, muscle activity increases are modulated by pain catastrophizing, chronic pain self-efficacy, and health status in these patients, and kinesiophobia seems to especially modulate entropy.

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Knee Extensor Fatigue Threshold Is Related to Whole-Body V˙O2max

Cited by 6 publications

References 33 publications

Variation in the spatial distribution of erector spinae activity during a lumbar endurance task in people with low back pain

Variation in the spatial distribution of erector spinae activity during a lumbar endurance task in people with low back pain

Oxygenation Threshold Derived from Near-Infrared Spectroscopy: Reliability and Its Relationship with the First Ventilatory Threshold

Neuromuscular Responses and Perceptions of Health Status and Pain-Related Constructs in End-Stage Knee Osteoarthritis During Resistance Training With Blood Flow Restriction

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