Changes in Amplitude of Hamstring Electromyographic Activity and Its Peak Location During Nordic Hamstring Exercise by Adding External Load

Soga, Toshiaki; Saito, Hiromi; Akiyama, Kei; Hirose, Norikazu

doi:10.1123/ijatt.2021-0117

International Journal of Athletic Therapy and Training

2023

DOI: 10.1123/ijatt.2021-0117

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Changes in Amplitude of Hamstring Electromyographic Activity and Its Peak Location During Nordic Hamstring Exercise by Adding External Load

Toshiaki Soga

Hiromi Saito

Kei Akiyama

et al.

Abstract: This crossover trial aimed to investigate whether additional loading of unilateral Nordic hamstring exercise on a sloped platform would increase the biceps femoris long head electromyographic activity. Participants were randomly allocated to unilateral Nordic hamstring exercise under three conditions: bodyweight only (BW) or BW with an added weighted ball of 3 kg (BW + 3 kg) or 6 kg (BW + 6 kg), respectively. The biceps femoris long head electromyographic activity was significantly higher for BW + 6 kg (p <… Show more

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2023

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Electromyographic activity of hip extensor muscles during Nordic hamstring and razor curl exercises on leveled and inclined shanks

Soga,

Hakariya,

Saito

et al. 2023

Sport Sci Health

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Background Changes in electromyographic (EMG) activity of hip extensor muscles and knee flexion angles at peak biceps femoris long head (BFlh) EMG activity by different shank angles during razor curl (RC) exercises are unknown. Aims We investigated the changes in EMG activity of hip extensor muscles and knee flexion angle at peak BFlh EMG activity with different shank angles during RC and also compared the Nordic hamstring (NH) and RC exercises in the EMG activity of hip extensor muscles. Methods Twelve male university students randomly performed two repetitions of NH and RC with the lower leg slope angle set at 0° (NH0, RC0) and 40° (NH40, RC40). The EMG activity of hip extensor muscles was measured at the BFlh and related muscles. EMG activity was calculated based on the peak value of the root mean square, normalized as a percentage of the maximum voluntary isometric contraction. Results The BFlh EMG activity of NH0 was higher than that of RC0 (p = 0.002) and RC40 (p = 0.008). The knee flexion angle at peak BFlh EMG activity of NH0 was larger than that of NH40 (p = 0.003) and RC40 (p = 0.002), and RC0 was larger than that of NH40 (p = 0.002) and RC40 (p = 0.002). Conclusion NH40, the BFlh EMG activity equivalent to NH0, might be more effective for preventing recurrence of hamstring injury because the knee flexion angle at peak BFlh EMG activity remains within 30°, combined with a high BFlh EMG activity.

show abstract

Electromyographic activity of hip extensor muscles during Nordic hamstring and razor curl exercises on leveled and inclined shanks

Soga,

Hakariya,

Saito

et al. 2023

Sport Sci Health

View full text Add to dashboard Cite

show abstract

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Changes in Amplitude of Hamstring Electromyographic Activity and Its Peak Location During Nordic Hamstring Exercise by Adding External Load

Cited by 1 publication

References 30 publications

Electromyographic activity of hip extensor muscles during Nordic hamstring and razor curl exercises on leveled and inclined shanks

Electromyographic activity of hip extensor muscles during Nordic hamstring and razor curl exercises on leveled and inclined shanks

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