Myoeletric Activity of the Quadriceps During Leg Press Exercise Performed With Differing Techniques

Machado, Wallace; Paz, Gabriel Andrade; Mendes, Leonardo de Souza; Maia, Marianna de Freitas; Winchester, Jason B.; Lima, Vicente Pinheiro; Willardson, Jeffrey M.; Miranda, Humberto

doi:10.1519/jsc.0000000000001494

Cited by 7 publications

(31 citation statements)

References 27 publications

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“…Assuming that a set of stationary horizontal signals was 10 and the standard deviation was 2, the range within 3 times of the standard deviation was equal to 10 ± 6 or 4-16, and the value of +16 was set to CT, as shown in Equation (6).…”

Section: Signal Processingmentioning

confidence: 99%

“…CT = Q + 3σ (6) This study used CT to capture the start and end positions of the threshold beyond and expressed it as a segment from a point to b point. The starting position higher than the threshold value was set to point a, and the ending position lower than the threshold value was set to point b.…”

Section: Signal Processingmentioning

confidence: 99%

“…In [6], the aim was to analyze surface electromyographic (SEMG) responses for biceps femoris (BF), rectus femoris (RF), VMO, and VL, as well as the VMO:VL ratio during an open-kinetic chain 45 • angled leg press (LP45). The traditional LP45 technique was compared with 2 alternative LP45 exercise techniques that used a physioball and elastic band, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The corresponding rehabilitation and conditioning programs are often applied. As same as [6], it also investigated LP45 by physioball and elastic band with submaximal loads on EMG amplitude and fatigue indices. Higher levels of CRMS (Coefficient of Root Mean Square) and Cf5 were noted for RF muscles, VL, and VM, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In [6,7], it sought to investigate the effect of performing leg press (LP) 45 degrees using a physioball and elastic band to reduce excessive varus and valgus forces, to increase quadriceps activation and improve knee joint stabilization. The use of surface electromyography is a widely accepted technique for measuring the electrical signals produced by muscle contractions and estimating the strength of muscle.…”

Section: Introductionmentioning

confidence: 99%

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Evaluate the Medial Muscle Strength by Kick Training between the Standing and Sitting Postures

Tuan

et al. 2019

Applied Sciences

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In order to ameliorate the anterior knee pain or peripheral pain around the tibia caused by patellar lateral subluxation, we evaluated the kick training effects of standing or sitting postures in strengthening the vastus medialis obliquus (VMO) on the quadriceps femoris muscle. A total of 83 subjects (45 male; 38 female) in both sitting and standing positions performed 10° to 90° leg lift and kick training. Among the male group, the effect of the sitting posture was better than that of the standing posture, 74.31% of the former achieved the training goal. In the female group, the effect of a standing posture was better than that of a sitting posture, for which only 37.71% of the latter achieved the training purpose. However, a ratio of 84.34% in the female group showed that the strength of VMO on the quadriceps femoris muscle generated by leg kicking was greater than the strength generated by walking. While it was impossible to immediately achieve a greater effect of VMO on the quadriceps femoris muscle than vastus lateralis on the quadriceps femoris muscle, leg kicking did achieve the objective of enhancing the strength of VMO on the quadriceps femoris muscle.

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Section: Signal Processingmentioning

confidence: 99%

Section: Signal Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluate the Medial Muscle Strength by Kick Training between the Standing and Sitting Postures

Tuan

et al. 2019

Applied Sciences

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Influence of Feet Position and Execution Velocity on Muscle Activation and Kinematic Parameters During the Inclined Leg Press Exercise

Martín-Fuentes

Oliva-Lozano

Muyor

2021

Sports Health: A Multidisciplinary Approach

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Background: The leg press is one of the most typical exercises for strengthening the lower limbs. The objectives of this study were to compare 5 inclined leg press exercise conditions, varying the feet width stance (100% or 150% hip width), the feet rotation (0° or 45° external rotation) on the footplate and using 2 different movement velocities (MVs; maximum intended, and 2:2 seconds steady-paced velocities) to determine their effect on muscle activation as well as on the kinematic parameters between trained men and trained women. Hypotheses: There will be no significant differences in muscle activation with regard to the feet position. The higher the MV, the greater the muscle activation. Study Design: A cross-sectional cohort study. Level of Evidence: Level 3. Methods: A repeated-measures between-group design was performed to examine muscle activation and kinematic parameters for the different conditions between gender groups. The level of significance was set at alpha = 0.05 for all statistical analyses. Results: Muscle activation presented no differences between conditions regarding feet width stance or feet rotation. Furthermore, muscle activation was greater during positive phases than negative phases of the exercise for all conditions and was also greater under maximum intended velocity conditions compared with steady-paced conditions. Otherwise, the muscle activation pattern presented slight differences by gender. In men, the greatest muscle activation was for the vastus medialis, followed by the vastus lateralis (VL), rectus femoris (RF), and gluteus medialis (GMED), while in women, the greatest muscle activation was for the vastus medialis, followed by the RF, VL, and GMED. Finally, greater mean propulsive velocity, maximum velocity, maximum power, and footplate displacement values were reported for men than for women under all the conditions. Conclusion: The inclined leg press exercise produces the highest muscle activation in the vastus medialis, regardless of the velocity, feet stance, or gender. Clinical Relevance: Given that there are no differences in muscle activation regarding the feet stance, a participant’s preferred feet stance should be encouraged during the inclined leg press exercise. Furthermore, the MV would preferably depend on the session objective (a training or a rehabilitation program), being aware that there is greater muscle activation at higher speeds. The inclined leg press exercise could be performed as a closed kinetic chain exercise when the main objective is to activate the vastus medialis.

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Electromyography Activity of Vastus Medialis Obliquus and Vastus Lateralis Muscles During Lower Limb Proprioceptive Neuromuscular Facilitation Patterns in Individuals with and without Patellofemoral Pain Syndrome

2021

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Exercise therapy to strengthen quadriceps muscle is recommended in rehabilitation program for people with patellofemoral pain syndrome (PFPS). This study aimed to investigate the electromyography (EMG) activity of vastus medialis obliquus (VMO), vastus lateralis (VL) and VMO/VL ratio during PNF in individuals with and without PFPS. Methods: 26 persons with PFPS and 26 healthy subjects participated to study. All subjects performed PNF patterns (Flexion-Adduction-External Rotation (D1FL), Extension-Adduction-External Rotation (D2EX), D1FL+ load, D2EX+ load) and straight leg raise (SLR). The normalized EMG activity of VMO, VL and VMO/VL ratio were measured and analyzed using repeated measure ANOVA. Results: There were significant main effects of group and exercises for the both VMO and VL (p<0.05). It was found that except SLR and D2EX, in the other motions PFPS group had lower VMO activity compared to healthy group (p<0.05). For VL except SLR, in the other motions PFPS group had lower VL activity too (p<0.05). The PNF patterns activated VMO more than SLR, however it was not significant (p >0.05). Also; there weren't any significant difference between the two groups in VMO/VL activation ratios. Also, performing the PNF patterns with load increased VMO and VL muscles activity significantly (p<0.05). It also found that in PFPS group the VMO/VL ratio values in PNF patterns were significantly more than SLR and the highest VMO/VL ratio value (0.96) was found during D2EX. Conclusion: The PNF patterns due to provide optimal VMO/VL ratio value than SLR and proper balance between these two muscles can be recommended in rehabilitation of individuals with PFPS.

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Myoeletric Activity of the Quadriceps During Leg Press Exercise Performed With Differing Techniques

Cited by 7 publications

References 27 publications

Evaluate the Medial Muscle Strength by Kick Training between the Standing and Sitting Postures

Evaluate the Medial Muscle Strength by Kick Training between the Standing and Sitting Postures

Influence of Feet Position and Execution Velocity on Muscle Activation and Kinematic Parameters During the Inclined Leg Press Exercise

Electromyography Activity of Vastus Medialis Obliquus and Vastus Lateralis Muscles During Lower Limb Proprioceptive Neuromuscular Facilitation Patterns in Individuals with and without Patellofemoral Pain Syndrome

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