EMG amplitude of the biceps femoris during jumping compared to landing movements

Padulo, Johnny; Tiloca, A; Powell, Douglas W.; Granatelli, G; Bianco, Antonino; Paoli, Antonio

doi:10.1186/2193-1801-2-520

Cited by 75 publications

(63 citation statements)

References 31 publications

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“…1B) as previously described [19][20][21][22] . The linear encoder had a spatial resolution of 0.1 mm (range 3.5 m, max speed 24 m/s) and a sampling frequency of 100 Hz.…”

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confidence: 99%

Electromyographic analysis of riding posture during the bicycling start moment

Padulo

Ardigò

Milić

et al. 2016

Motriz: rev. educ. fis.

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-Professional cyclists often adopt a competition-start standing posture, which has been shown to improve performance. The biomechanical basis of this is unclear, and might be due to a greater mechanical advantage or increased key muscle activity. Previous observations in steady state cycling showed greater activation of the tibialis anterior, erector spinae, and biceps brachii when adopting a standing vs. seated-riding posture. Little is known regarding the effect of riding posture on activation during a standing start. Eleven cyclists performed standing starts in seated and standing-postures using stationary-cycle and on the track. Electromyography of the gastrocnemius medialis, tibialis anterior, erector spinae, and biceps brachii was recorded during first and subsequent pedal strokes. Results showed that the gastrocnemius medialis did not modify activity. The tibialis anterior, erector spinae, and biceps brachii activity was increased during the standing posture compared to seated, only during the first pedal stroke. These increased activation intensities were accompanied by a corresponding 10% increase in bike speed during the first 5 meters following a standing start in the standing posture compared to the seated one. Adopting a standing posture during a standing start improves performance through greater initial acceleration.

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“…1B) as previously described [19][20][21][22] . The linear encoder had a spatial resolution of 0.1 mm (range 3.5 m, max speed 24 m/s) and a sampling frequency of 100 Hz.…”

mentioning

confidence: 99%

Electromyographic analysis of riding posture during the bicycling start moment

Padulo

Ardigò

Milić

et al. 2016

Motriz: rev. educ. fis.

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“…The musculoskeletal load was measured by several researchers associated with EMG for analyzing muscular response of upper limb [15][16][17], and for studying the muscle activities of lower limb [18,19].…”

Section: Introductionmentioning

confidence: 99%

Quantification of lower extremity physical exposures in various combinations of sit/stand time duration associated with sit-stand workstation

Pei

Babski-Reeves

et al. 2017

Med Pr

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Background: Sit-stand workstations are available for office work purposes but there is a dearth of quantitative evidence to state benefits for lower limb outcomes while using them. And there are no guidelines on what constitutes appropriate sit/stand time duration. The primary aim of this study has been to compare muscle activity and perceived discomfort in the lower extremity during various combinations of sit/stand time duration associated with a sit-stand workstation separately and to evaluate the effects of the sit-stand workstation on the lower extremity during the text entry task. Material and Methods: During the 5 days, all participants completed a 2-h text entry task each day for various sit/stand time duration combinations as follows: 5/25 min, 10/20 min, 15/15 min, 20/10 min, 25/5 min. Lower extremity muscular exposure of 12 male and 13 female participants was collected at 8 sites by surface electromyography and body discomfort was calculated by a questionnaire under those 5 conditions. Results: Results have demonstrated that lower extremity muscle activity has been significantly varied among the 5 sit/stand time duration groups. Perceived level of discomfort (PLD) has not differed significantly for 9 out of 10 body parts. Conclusions: The muscle activity of the thigh region was influenced by sit/stand time duration significantly. Ergonomic exposures of lower extremity when using a sitstand workstation were increased, particularly during the long time standing posture. Results indicate that body mass index (BMI) and gender were not significant factors in this study. Combination of sit/stand time duration 25/5 min appears to show positive effects on relief of muscle exposure of back of thigh in the shifts of sitting and standing work position. Med Pr 2017;68(3):315-327

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“…9 The CMJ involves an elastic muscle force, in contrast to the explosive strength of the muscles of the lower extremities. 9 A strength shortening cycle (SSC) requires strength and performance development compared with a purely concentric movement. 8,10 Therefore, trainers and athletes commonly use SSC to develop performance.…”

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confidence: 99%

“…The SJ starts with the knee flexed to nearly 90°and terminates with a concentric (CON) contraction of the knee and hip to push the body upward. 9 The CMJ starts at a standing position and requires the rapid flexion and eccentric contraction (lengthening) of the hip and knee extensors, increasing the muscles' length and movement in conjunction with a concentric, shortening contraction of the hip and knee extensors. 9 The CMJ involves an elastic muscle force, in contrast to the explosive strength of the muscles of the lower extremities.…”

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confidence: 99%

“…9 The CMJ starts at a standing position and requires the rapid flexion and eccentric contraction (lengthening) of the hip and knee extensors, increasing the muscles' length and movement in conjunction with a concentric, shortening contraction of the hip and knee extensors. 9 The CMJ involves an elastic muscle force, in contrast to the explosive strength of the muscles of the lower extremities. 9 A strength shortening cycle (SSC) requires strength and performance development compared with a purely concentric movement.…”

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confidence: 99%

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Relationships Among Vertical Jumping Performance, EMG Activation, and Knee Extensor and Flexor Muscle Strength in Turkish Elite Male Volleyball Players

Şimşek¹,

Kırkaya²,

Güngör³

et al. 2016

Turkiye Klinikleri J Sports Sci

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A AB BS S T TR RA AC CT T O Ob bj je ec ct ti iv ve e: : The aim of this study was to determine the relationship among maximum isokinetic concentric knee torque, muscle activity (EMG) and vertical jumping height of Turkish elite male volleyball players. M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : Twelve elite male volleyball players were included voluntary in this study. EMG activity was recorded on the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF) and biceps femoris (BF) muscles of volleyball players during five maximal isokinetic concentric-concentric contractions at 60°/s, 180°/s and 240°/s. Peak anaerobic power output was calculated using vertical jumping heights. A repeated measures analysis of variance (ANOVA) was used to compare torque values in different angular velocities. Pearson's correlation coefficient was used to evaluate the relationship between torque and muscle activation values. The statistical significance level was set at p<0.05. R Re es su ul lt ts s: : The results of this study show that Hamstring/Quadriceps (H:Q) ratios are greatest at an angular velocity of 240°/s. Differences in EMG activity during isokinetic testing were observed between the knee extensor (VL, VM) and flexor muscles (BF) (p<0.05). Repeated maximal isokinetic concentric contractions caused to increase the EMG activity of the knee and flexor muscles (p<0.05). In this study, it is demonstrated that volleyball players produced significantly higher counter movement jumping (CMJ) heights than squat jumping (SJ) heights (10%) (p=0.028). The maximum power of a CMJ was higher than that of an SJ (p=0.000), concentric work (p=0.001) and peak anaerobic power (p=0.020). Additionally, negative correlation was observed between VM, RF and BF muscle activation and isokinetic concentric-concentric torque values. C Co on nc cl lu us si io on n: : It was thus concluded that the muscle activity of the knee extensor and flexor muscles changes with change in isokinetic torque at different angular velocity and repetition.K Ke ey y W Wo or rd ds s: : Muscle activation; torque; isokinetic force Ö ÖZ ZE ET T A Am ma aç ç: : Çalışmanın amacı Türk elit erkek voleybolcuların diz ekstansör ve fleksör kaslarının maksimum konsantrik tork, dikey sıçrama ve kassal aktivasyon (EMG) değerleri arasındaki ilişkileri belirlemektir. G Ge er re eç ç v ve e Y Yö ön nt te em ml le er r: : On iki elit erkek voleybolcu gönüllü olarak çalışmaya dahil edilmiştir. Voleybolcuların vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF) ve biceps femoris (BF) kaslarının kassal aktiviteleri (EMG), 60°/s, 180°/s and 240°/s açısal hızlarda, 5 maksimal izokinetik konsantrik-konsantrik kasılma sırasında kayıt edilmiştir. Zirve anaerobik güç çıktısı, squat sıçrama (SS) ve aktif sıçrama (AS) verileri hesaplanarak oluşturulmuştur. Farklı açısal hızlarda elde edilen tork değerleri tekrarlayan ölçümlerde varyans analizi (ANOVA) ile karşılaştırılmıştır. Tork ve kassal aktivasyon değer-leri arasındaki korelasyonlar Pearson korelasyon kats...

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EMG amplitude of the biceps femoris during jumping compared to landing movements

Cited by 75 publications

References 31 publications

Electromyographic analysis of riding posture during the bicycling start moment

Electromyographic analysis of riding posture during the bicycling start moment

Quantification of lower extremity physical exposures in various combinations of sit/stand time duration associated with sit-stand workstation

Relationships Among Vertical Jumping Performance, EMG Activation, and Knee Extensor and Flexor Muscle Strength in Turkish Elite Male Volleyball Players

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