Effect of prolonged vibration to synergistic and antagonistic muscles on the rectus femoris activation during multi-joint exercises

Ema, Ryoichi; Takayama, Hirokazu; Miyamoto, Naokazu; Akagi, Ryota

doi:10.1007/s00421-017-3702-1

Cited by 5 publications

(4 citation statements)

References 35 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the KF, significant hypertrophy was not found in any muscle, which is consistent with a recent study (Kubo et al, 2019). Previous studies showed that the activation levels of the hamstrings were lower than those of some of the KE during squat exercises as per EMG (Ema et al, 2017) or T-2 weighted MRI findings (Sugisaki et al, 2014). Sugisaki et al (2014) suggested that a lack of change in the lengths of the hamstring muscles during squat exercises partially explains the weak activation of the hamstrings.…”

Section: Discussionsupporting

confidence: 89%

Eight-Week Low-Intensity Squat Training at Slow Speed Simultaneously Improves Knee and Hip Flexion and Extension Strength

et al. 2020

Self Cite

View full text Add to dashboard Cite

Considering that the squat exercise requires flexion and extension of the knee and hip joints, a resistance training program based on squat exercises should efficiently increase the flexion and extension strength of both the knee and hip. To our knowledge, however, no study has simultaneously investigated the effects of squat training on both flexion and extension strength in both the knee and hip. Low-intensity squat exercises at slow speeds can be expected to effectively and safely improve knee and hip flexion and extension strength in a wide range of individuals. This study aimed to clarify whether knee and hip flexion and extension strength improved after an 8-week low-intensity squat training program at slow speed. Twenty-four untrained young men were randomly assigned to a training or control group. Participants in the training group performed 40% one-repetition maximum parallel squats at slow speed (4 s for concentric/eccentric actions), 3 days per week for 8 weeks. Before and after the intervention, isometric peak torque of the knee and hip flexors and extensors during maximal voluntary contraction (MVC) was determined. For the knee flexors and extensors, muscle volume was also measured. There were significant training-induced increases in peak torque (P < 0.05). The training effects on knee and hip extension torque (effect size = 0.36-0.38) were higher than those on knee and hip flexion torque (effect size = 0.09-0.13). The squat training used here increased both knee and hip flexion and extension strength, but the training effects on the flexion strength were less than those on the extension strength. Regarding the knee extensors, a significant training-related increase in muscle volume was found (P < 0.05) without neuromuscular adaptations. In addition, there were significant correlations between the training-induced increases in muscle volume and peak torque of KE. These results suggest that muscle hypertrophy may be responsible for increased muscle strength of the knee extensors after an 8-week low-intensity squat training program at slow speed.

show abstract

Section: Discussionsupporting

confidence: 89%

Eight-Week Low-Intensity Squat Training at Slow Speed Simultaneously Improves Knee and Hip Flexion and Extension Strength

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The vibration force was determined using a load cell (LUR-A50NSA1, Kyowa, Japan) attached to the vibration generator. The force during vibration and peak-to-peak amplitude of the vibration were controlled at 10-15 N and 1.6 mm, respectively (Ema et al, 2017b). The current setup was in accordance with that of a previous study that reported significant decreases in the Ia afferent activity of the plantar flexors, maximal plantar flexion strength, and agonist muscle activity after intervention (Ushiyama et al, 2005).…”

Section: Vibrationsupporting

confidence: 79%

Age-Related Differences in the Effect of Prolonged Vibration on Maximal and Rapid Force Production and Balance Ability

et al. 2020

Self Cite

View full text Add to dashboard Cite

We tested the hypothesis that older adults would not likely experience deficits in maximal and explosive plantar flexion strength and standing balance performance induced by prolonged Achilles tendon vibration compared with young adults. Fifteen older men (OM, 73 ± 5 years) and 15 young men (YM, 24 ± 4 years) participated in two interventions on different days: lying in a quiet supine position for 30 min with or without prolonged vibration to the Achilles tendon. Before and after the interventions, maximal voluntary contraction (MVC) torque during plantar flexion, rate of torque development (RTD), and center of pressure (COP) speed during single-leg standing were measured. The root mean square of the electromyogram (RMS-EMG) during performance and V-wave and voluntary activation during MVC were assessed. The MVC torque (7 ± 7%) and RTD (16 ± 15%) of YM but not OM significantly decreased after vibration. In addition, the relative changes observed in YM positively correlated with changes in RMS-EMG of the medial gastrocnemius (MG) (MVC torque and RTD) and in MG V-wave and voluntary activation (MVC torque). COP speed significantly increased (16 ± 20%) in YM only after vibration and was accompanied by increased activation of the lateral gastrocnemius. This is the first study to show that the effects of prolonged Achilles tendon vibration on strength and balance performances were apparent in young adults only. The differences between the age groups may be related to the attenuated gastrocnemius neuromuscular function in older adults.

show abstract

“…In Experiment 3, the BF spinal reflex during vibration on the RF muscle was also prominently inhibited. A behavioral study showed that prolonged vibration on knee extensor neither changed the maximum voluntary isometric knee flexion torque nor activation the knee flexors during squat exercise (Ema et al., 2017 ). Thus, it remains unclear whether vibration stimuli can induce reciprocal inhibition in the thigh muscles, but the present study clearly suggested vibration‐induced reciprocal inhibition between the thigh muscles.…”

Section: Discussionmentioning

confidence: 99%

“…Muscle vibration is supposed to stimulate both Ia and Ib sensory fibers (Ema et al., 2017 ). As Ib inhibition has been suggested to work not only on the agonist and synergistic muscles but also on the antagonist muscle (Cardinale & Bosco, 2003 ; Yanagawa et al., 1991 ), the effect of Ib inhibition would contribute to the inhibition of the BF spinal reflex induced by the RF vibration in addition to Ia reciprocal inhibition in the present study.…”

Section: Discussionmentioning

confidence: 99%

Reciprocal inhibition of the thigh muscles in humans: A study using transcutaneous spinal cord stimulation

Nakagawa,

Kakehata,

Kaneko

et al. 2024

Physiological Reports

View full text Add to dashboard Cite

Evaluating reciprocal inhibition of the thigh muscles is important to investigate the neural circuits of locomotor behaviors. However, measurements of reciprocal inhibition of thigh muscles using spinal reflex, such as H‐reflex, have never been systematically established owing to methodological limitations. The present study aimed to clarify the existence of reciprocal inhibition in the thigh muscles using transcutaneous spinal cord stimulation (tSCS). Twenty able‐bodied male individuals were enrolled. We evoked spinal reflex from the biceps femoris muscle (BF) by tSCS on the lumber posterior root. We examined whether the tSCS‐evoked BF reflex was reciprocally inhibited by the following conditionings: (1) single‐pulse electrical stimulation on the femoral nerve innervating the rectus femoris muscle (RF) at various inter‐stimulus intervals in the resting condition; (2) voluntary contraction of the RF; and (3) vibration stimulus on the RF. The BF reflex was significantly inhibited when the conditioning electrical stimulation was delivered at 10 and 20 ms prior to tSCS, during voluntary contraction of the RF, and during vibration on the RF. These data suggested a piece of evidence of the existence of reciprocal inhibition from the RF to the BF muscle in humans and highlighted the utility of methods for evaluating reciprocal inhibition of the thigh muscles using tSCS.

show abstract

Effect of prolonged vibration to synergistic and antagonistic muscles on the rectus femoris activation during multi-joint exercises

Cited by 5 publications

References 35 publications

Eight-Week Low-Intensity Squat Training at Slow Speed Simultaneously Improves Knee and Hip Flexion and Extension Strength

Eight-Week Low-Intensity Squat Training at Slow Speed Simultaneously Improves Knee and Hip Flexion and Extension Strength

Age-Related Differences in the Effect of Prolonged Vibration on Maximal and Rapid Force Production and Balance Ability

Reciprocal inhibition of the thigh muscles in humans: A study using transcutaneous spinal cord stimulation

Contact Info

Product

Resources

About