The Effect of an Interphase Interval on Electrically Induced Dorsiflexion Force and Fatigue in Subjects With an Upper Motor Neuron Lesion

Becher, Meni; Springer, Shmuel; Braun-Benyamin, Orit; Laufer, Yocheved

doi:10.1111/aor.12698

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…Additionally, it neither did affect the levels of discomfort and current intensity, nor did it reduce sensory and motor thresholds. These findings contradict previous findings that demonstrated that IPI positively affected the strength of the EICs without concomitant effects on the degree of discomfort 14‐16,21,22 . We suggest that this difference is primarily attributed to the unique methodology used in this study, in which the current intensity applied with the various parameter settings was not predetermined at a fixed level.…”

Section: Discussioncontrasting

confidence: 99%

Effects of interphase interval during neuromuscular electrical stimulation of the wrist extensors with maximally tolerated current intensity

Elboim-Gabyzon

Awad

2020

Artificial Organs

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Short interphase intervals (IPIs) within biphasic symmetrical pulses enhance maximal electrically induced isometric contractions (EIC). However, IPI effects have not been previously studied in muscles stimulated at the highest tolerated current intensity. Our aim was to examine IPI effects on the strength of EIC, degree of discomfort, and sensory and motor thresholds on the wrist extensor muscles. Eighteen subjects (mean age 25.5, SD ± 3.97 years) participated in a repeated‐measures trial. Five parameter settings were used to stimulate the wrist extensors: monophasic pulses with phase durations (PD) 200 µs, and biphasic pulses with PDs either 200 or 500 µs, applied with/without an IPI of 200 µs duration. Order of settings was randomized, and current was set at the maximum intensity tolerated by each subject. IPIs applied at the maximally tolerated current intensity did not increase the strength of the EICs and did not reduce the degree of discomfort or the sensory and motor thresholds. These findings were not dependent on the PDs. Insertion of an IPI within the biphasic current during stimulation of the wrist muscle yielded no advantage in term of contraction strength or degree of discomfort. These results contradict previous studies indicating stronger contractions when an IPI is inserted during stimulation at a predetermined submaximal current intensity. As some of the clinical applications of neuromuscular electrical stimulation utilize the highest intensity tolerated by the individual, these findings are clinically relevant. Additional studies involving other muscle groups, electrode size and locations, and phase parameters are warranted.

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Section: Discussioncontrasting

confidence: 99%

Effects of interphase interval during neuromuscular electrical stimulation of the wrist extensors with maximally tolerated current intensity

Elboim-Gabyzon

Awad

2020

Artificial Organs

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“…The greater the pulse duration and frequency, the greater the contraction. Increasing these parameters will increase discomfort and fatigue [33]. In the classical literature, mid-frequency neuromuscular electrical stimulation includes Russian currents and interference currents [31].…”

Section: Electrotherapy Methodsmentioning

confidence: 99%

Using Burst Modality Medium Frequency Alternating (Russian and Aussie) Currents with Isokinetic Training

Çankaya,

Çıtak Karakaya

2024

New Horizons of Exercise Medicine

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Isokinetic exercises are a type of exercise that can be performed both concentrically and eccentrically at various angular velocities while applying resistance to the muscles at each point of the range of motion. These exercises are known to have many benefits compared to other exercises. Electrotherapy modalities are a popular treatment used by physiotherapists for a variety of purposes, such as muscle strengthening, endurance, spasticity management, pain control, circulation enhancement, and edema control. Kilohertz-frequency alternating currents were introduced in the pioneering work of Kots as a new form of neuromuscular electrical stimulation that was believed to solve some of the limitations of conventional electrical stimulation. Russian current is a medium-frequency alternating current that is delivered in bursts, with the carrier frequency ranging from 1000 to 10,000 Hz and any burst frequency being acceptable. Aussie currents are utilized in clinics at 1000 Hz, modulated in 50 Hz intervals with a pulse duration of 2 msec. Medium-frequency currents, particularly Russian and Aussie currents in isokinetic training, provide muscle strength contraction and endurance, increased blood circulation, and specific physiological effects. Considering the person’s health status, existing injuries, or other health problems, Russian and Aussie currents can be used effectively in isokinetic training at appropriate levels under the guidance of a physician and physiotherapist.

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“…current intensity delivered ≤15% MVC) has been recently combined with BFR with promising clinical results on strength and hypertrophy (Natsume et al, 2015; Slysz et al, 2020). Low‐frequency (LF) NMES might represent a more tolerable stimulus than high‐frequency (HF) NMES, as the latter triggers a stronger muscle contraction but may also increase discomfort (Becher et al, 2016; Gregory et al, 2007) and muscle fatigue (Bickel et al, 2012; Gregory et al, 2007; Russ et al, 2002). However, when NMES and BFR are combined and high external pressures are applied – up to 80% of arterial occlusion pressure (AOP) to occlusion – fatigue can occur not only at HF (Head et al, 2020) but also at LF (Cole & Brown, 2000; Murthy et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Acute effects of electrostimulation and blood flow restriction on muscle thickness and fatigue in the lower body

Santiago-Pescador

Fajardo-Blanco

López-Ortiz

et al. 2022

European Journal of Sport Science

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Neuromuscular electrical stimulation (NMES) in combination with blood flow restriction (BFR) enhances muscle hypertrophy and force-generating capacity. The present study aimed to investigate the acute effects of BFR and NMES, both in isolation and in combination, on muscle thickness (MT) and fatigue in the lower body of 20 young healthy subjects. Different stimuli were applied for 25 min, defined by the combination of BFR with high-and low-frequency NMES, and also isolated BFR or NMES. Changes in MT were then evaluated by ultrasound of the rectus femoris (RF) and vastus lateralis (VL) muscles at the end of the session (POST) and 15 min later (POST 15'). Lower limb fatigue was evaluated indirectly by strength performance. Results showed that RF MT was higher under the combined protocol (BFR + NMES) or isolated BFR than under NMESregardless of the frequencyboth at POST (p ≤ 0.018) and POST 15' (p ≤ 0.016). No significant changes in MT were observed under isolated NMES or BFR at POST 15' when compared with basal values (p ≥ 0.067). No significant differences were observed for VL MT between conditions (p = 0.322) or for fatigue between conditions (p ≥ 0.258). Our results indicate that a combination of BFR and NMES acutely increases MT in sedentary subjects. Also, although not significantly, BFR conditions had a greater tendency to induce fatigue than isolated NMES. Highlights. The combination of blood flow restriction (BFR) and neuromuscular electrical stimulation (NMES) produces higher acute cell swelling than the isolated application of either NMES or BFR. . BFR in isolation appears to produce greater cell swelling than NMES, regardless of the frequency used. . BFR conditions had a greater tendency to induce fatigue than isolated NMES.

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The Effect of an Interphase Interval on Electrically Induced Dorsiflexion Force and Fatigue in Subjects With an Upper Motor Neuron Lesion

Cited by 8 publications

References 33 publications

Effects of interphase interval during neuromuscular electrical stimulation of the wrist extensors with maximally tolerated current intensity

Effects of interphase interval during neuromuscular electrical stimulation of the wrist extensors with maximally tolerated current intensity

Using Burst Modality Medium Frequency Alternating (Russian and Aussie) Currents with Isokinetic Training

Acute effects of electrostimulation and blood flow restriction on muscle thickness and fatigue in the lower body

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