Mechanomyography and electromyography force relationships during concentric, isometric and eccentric contractions

Madeleine, Pascal; Bajaj, Prem; Søgaard, Karen; Arendt‐Nielsen, Lars

doi:10.1016/s1050-6411(00)00044-4

Cited by 149 publications

(121 citation statements)

References 27 publications

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“…It is known that the blood pressure response during exercise has relationships with exercise intensity, duration and active muscle mass. 32,33 It is also known that although ECC includes less active muscle mass than CON [34][35][36][37] its exerted muscle strength is higher than CON. 16,31 Therefore, it might be thought that the active muscle mass in CON increases more than in ECC and that the accompanying significant vasopressor response increases the load on blood vessels.…”

Section: Discussionmentioning

confidence: 99%

Effects of eccentric and concentric resistance training on arterial stiffness

2006

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It has been suggested that resistance training (RT) increases arterial stiffness. The purpose of the present study was to clarify the effect of eccentric RT (ERT) and concentric RT (CRT) on arterial stiffness in female adults by an interventional study. In total, 29 healthy female subjects were randomly assigned to either the ERT group (n ¼ 10), CRT group (n ¼ 10) or sedentary (SED) group (n ¼ 9). The ERT and CRT groups performed resistance training three times a week for 8 weeks. We determined brachial blood pressure, brachial-ankle pulse wave velocity (baPWV), carotid artery intimamedial thickness (IMT) and carotid arterial lumen diameter before and after training and after detraining.The before-training baPWV did not differ significantly among the three groups. After 8 weeks of RT, arterial stiffness in the CRT group was increased compared with the ERT and SED group (Po0.05). However, brachial blood pressure, baPWV, carotid IMT and carotid lumen diameter in the ERT and CRT groups were unchanged by RT for 8 weeks. Consequently, it was clarified that arterial stiffness was not changed by ERT for 8 weeks. This suggests that ERT may be effective as an exercise prescription for middle-aged and elderly adults.

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Section: Discussionmentioning

confidence: 99%

Effects of eccentric and concentric resistance training on arterial stiffness

2006

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“…Some authors have concluded , for various muscles, that the magnitude of the EMG signal is directly proportional to muscle strength for isometric and/or isotonic contractions with constant speed, but others claim that this relationship is not linear (Bilodeau et al, 2003;Gerdle et al, 1991;Gregor et al, 2002;Herzog et al, 1998;Karlsson & Gerdle, 2001;Moritani & Muro, 1987;Onishi et al, 2000). In most cases, the EMG increases non-linearly with increasing force of muscle contraction (Guimaraes et al, 1994;Madeleine et al, 2000;Lawrence & De Luca, 1983;Solomonow et al, 1990). Theoretical analyses suggest that the amplitude of the signal in isometric contraction should increase with the square root of the force generated if the motor units are activated independently (Basmajian & De Luca, 1985;Lawrence & De Luca, 1983).…”

Section: Relationship Between Emg and Forcementioning

confidence: 99%

“…For example, one can find examples in the literature, in which strength has been related to the intensity, or to the median or mean frequency of the EMG signal. Among the most used EMG parameters for such analysis, is the time series analysis, in which the the effective value of the signal, is derived from the root mean square -RMS (Basmajian & De Luca, 1985;Bigland-Ritchie, 1981;Bilodeau et al 2003;Gerdle et al 1991; www.intechopen.com Gregor et al 2002;Guimaraes et al 1994;Herzog et al 1998;Lawrence & De Luca, 1983;Madeleine et al, 2000;Onishi et al, 2000;Solomonow et al, 1990). This is a method to quantify the signal amplitude, recommended to assess the level of muscle activity, since the parameter is not affected by the superposition of APMU (Acierno et al, 1995;Basmajian & De Luca, 1985;De Luca, 1997).…”

Section: Wwwintechopencommentioning

confidence: 99%

The Relationship Between Electromyography and Muscle Force

Kuriki¹,

Azevedo²,

Takahashi³

et al. 2012

EMG Methods for Evaluating Muscle and Nerve Function

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“…The previous studies [38][39][40][41][42] found that maximal unloaded shortening velocity in fast-twitch fibers was faster in comparison to slow-twitch fibers and suggested that fast-twitch fibers produced higher force in comparison to slow-twitch fibers in a given time [38][39][40][41]. Also, many studies demonstrated a direct relationship between muscle force and EMG activity [36,[43][44][45][46]. As a result, higher hamstring activation rate found in younger adults in the present study could play a role in producing higher force in hamstring muscles (Fig.…”

Section: Hamstring Activation Rate In Older Adults Was Lower Than Thementioning

confidence: 99%

Relationship between hamstring activation rate and heel contact velocity: Factors influencing age-related slip-induced falls

Lockhart¹,

Kim²

2006

Gait & Posture

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The purpose of this research was to determine whether a decreased hamstring activation rate among the elderly is responsible for a higher horizontal heel contact velocity and increased likelihood of slip-induced falls compared to their younger counterparts. Twenty-eight subjects from two age groups (14 young and 14 old) walked across a linear walking track with embedded force platforms while wearing a fall arresting harness attached to an overhead arresting rig for safety. In order to obtain realistic unexpected slip-induced fall data, a soapy vinyl floor surface was hidden from the subjects and unexpectedly introduced. Synchronized kinematics, kinetic and electromyography (EMG) analyses during the heel contact phase of the gait cycle while walking over slippery and nonslippery floor surfaces were examined in the study. Normalized EMG data were examined in terms of hamstring activation rate and evaluated with heel contact velocity and friction demand characteristic (as measured by peak required coefficient of friction (RCOF)) on the dry vinyl floor surface. Furthermore, slip parameters (i.e. slip distances and slipping velocity) were assessed on the soapy vinyl floor surface. The results indicated that younger adults' hamstring activation rate was higher than older adults, whereas younger adults' heel contact velocity was not different from older adults. These results suggested that heel contact velocity in younger adults was sufficiently reduced before the heel contact phase of the gait cycle. This could be due to the outcome of higher hamstring activation rate in younger adults in comparison to older adults. However, lower friction demand (peak RCOF), shorter slip distances, slower peak sliding heel velocity and more falls among older adults suggested that the slip initiation characteristics were not the only factors contributing to slip-induced falls among the elderly.

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Mechanomyography and electromyography force relationships during concentric, isometric and eccentric contractions

Cited by 149 publications

References 27 publications

Effects of eccentric and concentric resistance training on arterial stiffness

Effects of eccentric and concentric resistance training on arterial stiffness

The Relationship Between Electromyography and Muscle Force

Relationship between hamstring activation rate and heel contact velocity: Factors influencing age-related slip-induced falls

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