Muscle oxygen consumption, determined by NIRS, in relation to external force and EMG

Praagman, M.; Veeger, H.E.J.; Chadwick, Edward K.; Colier, Willy N.J.M.; Helm, F.C.T. van der

doi:10.1016/s0021-9290(03)00081-2

Cited by 77 publications

(66 citation statements)

References 15 publications

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“…Clearly this increase is far too great to be accounted for by any error in the calculation of MTC and the subsequent setting of the relative torque level. Finally, as found by others (15,32,39), mV O 2 increased with torque level in each of the muscles, which strongly suggests that mV O 2 is a good indicator of the number of force-generating cross bridges. Therefore, we think it is valid to conclude that energy consumption during constant torque production was lower at 30°than at the other angles.…”

Section: Discussionsupporting

confidence: 82%

Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy

Ruiter¹,

Boer²,

Spanjaard³

et al. 2005

Journal of Applied Physiology

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Ruiter, C. J. de, M. D. de Boer, M. Spanjaard, and A. de Haan. Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy. J Appl Physiol 99: 579 -586, 2005. First published March 17, 2005; doi:10.1152/japplphysiol.01420.2004.-Fatigue resistance of knee extensor muscles is higher during voluntary isometric contractions at short compared with longer muscle lengths. In the present study we hypothesized that this would be due to lower energy consumption at short muscle lengths. Ten healthy male subjects performed isometric contractions with the knee extensor muscles at a 30, 60, and 90°knee angle (full extension ϭ 0°). At each angle, muscle oxygen consumption (mV O2) of the rectus femoris, vastus lateralis, and vastus medialis muscle was obtained with near-infrared spectroscopy. mV O2 was measured during maximal isometric contractions and during contractions at 10, 30, and 50% of maximal torque capacity. During all contractions, blood flow to the muscle was occluded with a pressure cuff (450 mmHg). mV O2 significantly (P Ͻ 0.05) increased with torque and at all torque levels, and for each of the three muscles mV O2 was significantly lower at 30°compared with 60°a nd 90°and mV O2 was similar (P Ͼ 0.05) at 60°and 90°. Across all torque levels, average (Ϯ SD) mV O2 at the 30°angle for vastus medialis, rectus femoris, and vastus lateralis, respectively, was 70.0 Ϯ 10.4, 72.2 Ϯ 12.7, and 75.9 Ϯ 8.0% of the average mV O2 obtained for each torque at 60 and 90°. In conclusion, oxygen consumption of the knee extensors was significantly lower during isometric contractions at the 30°than at the 60°and 90°knee angle, which probably contributes to the previously reported longer duration of sustained isometric contractions at relatively short muscle lengths. energy utilization; submaximal isometric contractions; voluntary activation; fatigue TIME TO FORCE FAILURE DURING a single voluntary submaximal isometric muscle contraction is inversely related to knee extensor muscle length (16,21,26,31). Apparently, submaximal isometric contractions are less fatiguing at short muscle lengths compared with isometric contractions made at the same relative torque level but at longer muscle lengths. For tibialis anterior muscle it has been suggested (13) that the cause for the lower fatigability at short muscle lengths would be the lower energetic cost due to fewer cross-bridge interactions at short length compared with lengths that are closer to optimal overlap between actin and myosin filaments. However, two studies that explicitly investigated the idea of a length-dependent energy utilization in tibialis anterior muscle using 31 P-magnetic resonance spectroscopy ( 31 P-MRS) failed to show length-dependent energy consumption (2, 34).Recently, Place et al. (31) related the lower fatigability at short muscle lengths to a greater twitch potentiation at short compared with a longer length after a voluntary sustained contraction of the knee extensors at 20% maximal volun...

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Section: Discussionsupporting

confidence: 82%

Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy

Ruiter¹,

Boer²,

Spanjaard³

et al. 2005

Journal of Applied Physiology

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“…1 This correlation between increasing load, EMG and VO 2 has also been found in other studies, [40][41][42][43][44] which indicates that muscle force increases as a function of load. 42 Changes in EMG amplitude are mainly caused by a change in the number of active MUs and their mean ring rate. 40 Our results show that as the EMG amplitude increases, there is a simultaneous increase in deoxy concentration (Hb þ Mb), see Figs.…”

Section: Emg (Dynamic)supporting

confidence: 83%

Combined surface electromyography, near-infrared spectroscopy and acceleration recordings of muscle contraction: The effect of motion

Kauppi

Korhonen

Ferdinando

et al. 2017

J. Innov. Opt. Health Sci.

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Noninvasive techniques, surface electromyography (sEMG) in particular, are being increasingly employed for assessing muscle activity. In these studies, local oxygen consumption and muscle metabolism are of great interest. Measurements can be performed noninvasively using optics-based methods such as near-infrared spectroscopy (NIRS). By combining energy consumption data provided by NIRS with muscle level activation data from sEMG, we may gain an insight into the metabolic and functional characteristics of muscle tissue. However, muscle motion may induce artifacts into EMG and NIRS. Thus, the inclusion of simultaneous motion measurements using accelerometers (ACMs) enhances possibilities to perceive the e®ects of motion on NIRS and EMG signals.This paper reviews the current state of noninvasive EMG and NIRS-based methods used to study muscle function. In addition, we built a combined sEMG/NIRS/ACM sensor to perform simultaneous measurements for static and dynamic exercises of a biceps brachii muscle. Further, we discuss the e®ect of muscle motion in response of NIRS and EMG when measured noninvasively. Based on our preliminary studies, both NIRS and EMG supply speci¯c information on muscle activation, but their signal responses also showed similarities with acceleration signals which, in this case, were supposed to be solely sensitive to motions.

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“…There is not a direct linear relationship between the level of muscle activity and muscle force, work, or metabolism (28)(29)(30). Nevertheless, at the level of individual muscles, greater force and work are produced by increased activity of motor units, and increased force and work production are associated with elevated muscle metabolism (26,31). Thus, we believe we are justified in assuming that under the conditions of this study, changes in muscle activity during walking and running broadly reflect changes in the metabolism of the muscles studied.…”

Section: Discussionmentioning

confidence: 99%

“…An indirect approach that could falsify the hypotheses is electromyography (EMG). Although EMG cannot provide direct measures of muscle force, work, or metabolism, increases in amplitude and/or duration of EMG indicate increases in activity of muscle fibers and, therefore, provide a correlative indication of muscle metabolism within the recording field of the electrode (26).…”

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confidence: 99%

The musculoskeletal system of humans is not tuned to maximize the economy of locomotion

Carrier

Anders

Schilling

2011

Proc. Natl. Acad. Sci. U.S.A.

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Humans are known to have energetically optimal walking and running speeds at which the cost to travel a given distance is minimized. We hypothesized that "optimal" walking and running speeds would also exist at the level of individual locomotor muscles. Additionally, because humans are 60-70% more economical when they walk than when they run, we predicted that the different muscles would exhibit a greater degree of tuning to the energetically optimal speed during walking than during running. To test these hypotheses, we used electromyography to measure the activity of 13 muscles of the back and legs over a range of walking and running speeds in human subjects and calculated the cumulative activity required from each muscle to traverse a kilometer. We found that activity of each of these muscles was minimized at specific walking and running speeds but the different muscles were not tuned to a particular speed in either gait. Although humans are clearly highly specialized for terrestrial locomotion compared with other great apes, the results of this study indicate that our locomotor muscles are not tuned to specific walking or running speeds and, therefore, do not maximize the economy of locomotion. This pattern may have evolved in response to selection to broaden the range of sustainable running speeds, to improve performance in motor behaviors not related to endurance locomotion, or in response to selection for both.cost of transport | human evolution | persistence hunting | locomotor energetics | electromyography T he energetic cost to travel a given distance, the cost of transport (COT), has long been known to strongly depend on walking speed in humans (1, 2). The cost is minimized at intermediate walking speeds of 4.5-5.4 km·h −1 (1.25-1.5 m·s −1 ) and rises rapidly as speed increases above or decreases below this optimum. In contrast, the metabolic cost to run a given distance is generally recognized to be independent of speed in humans (2-6). Recently, however, a reevaluation of the COT in running humans has shown that humans also have energetically optimal speeds when running (7). This study relied on repeated measures from individual subjects, an approach that had the potential to identify the subtle relationship observed. There are at least three reasons to expect the COT to depend on locomotor speed. First, the force that a muscle generates decreases as its shortening velocity increases in a hyperbolic relationship. As a consequence of this relationship, a muscle's capacity to perform work and its energetic efficiency are highest at intermediate shortening velocities (8). Thus, if there is a relationship between locomotor speed and muscle shortening velocity, the force-velocity relationship may account for the COT being lowest at intermediate walking or running speeds. Note that this relationship is unlikely to explain energetically optimal speeds in both walking and running gaits because the shortening velocity of muscles in these two gaits will most often be very different. Second, the external mechan...

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Muscle oxygen consumption, determined by NIRS, in relation to external force and EMG

Cited by 77 publications

References 15 publications

Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy

Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy

Combined surface electromyography, near-infrared spectroscopy and acceleration recordings of muscle contraction: The effect of motion

The musculoskeletal system of humans is not tuned to maximize the economy of locomotion

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