Nordic Hamstring Exercise training induces improved lower-limb swing phase mechanics and sustained strength preservation in sprinters

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@article{bbcc9fd85c0c4c519fa436d35f12ddba,
title = "Nordic Hamstring Exercise training induces improved lower-limb swing phase mechanics and sustained strength preservation in sprinters",
abstract = "Nordic Hamstring Exercise (NHE) training improves eccentric hamstring strength and sprint performance. However, detraining causes rapid reductions of achieved adaptations. Furthermore, the transfer of improved hamstring capacity to swing phase mechanics of sprints is unknown. This longitudinal study aimed (1) to quantify NHE-induced adaptations by camera- based isokinetic assessments and sprint analyses, (2) to relate the magnitude of adaptations to the participants{\textquoteright} initial performance level, (3) to investigate the transferability to sprints, and (4) to determine strength preservations after three months. Twelve sprinters (21 y, 1.81 m, 74 kg) were analysed throughout 22 weeks. They performed maximal sprints and eccentric knee flexor and concentric knee extensor tests before and after a 4-week NHE training. Sprints and isokinetic tests were captured by ten and four high-speed cameras. The dynamic control ratio at the equilibrium point (DCRe) evaluated thigh muscle balance. High- intensity NHE training elicited significant improvements of hamstring function (p range: <0.001 to 0.011, d range: 0.44 to 1.14), thigh muscle balance (p<0.001, d range: 0.80 to 1.08) and hamstring-related parameters of swing phase mechanics (p range: <0.001 to 0.022, d range: 0.12 to 0.57). Sprint velocity moderately increased (+1.4%, p<0.001, d=0.26). Adaptations of Hecc hamstring function and DCRe thigh muscle balance revealed moderate to strong transfers to improved sprint mechanics (, p range: <0.001 to 0.048, R2 range: 34% to 83%). The weakest participants demonstrated the highest adaptations of isokinetic parameters (p range: 0.003 to ≤0.023, R2 range: 42% to 62%), whereas sprint mechanics showed no effect of initial performance level. Three months after the intervention, hamstring function (+6% to +14%) and thigh muscle balance (+8% to +10%) remained significantly enhanced (p<0.001, ƞp2 range: 0.529 to 0.621). High-intensity NHE training induced sustained, improved hamstring function of sprinters, which can be transferred to swing phase mechanics of maximal sprints. The initial performance level, NHE training procedures and periodisation should be considered to optimize adaptations.",
author = "Tobias Alt and Jannik Severin and Igor Komnik and Yannick Nodler and Rita Benker and Axel Knicker and Gert-Peter Br{\"u}ggemann and Str{\"u}der, {Heiko Klaus}",
year = "2020",
doi = "10.1111/sms.13909",
language = "English",
journal = "Scandinavian journal of medicine & science in sports",
issn = "1600-0838",
publisher = "Blackwell Munksgaard",

}

RIS

TY - JOUR

T1 - Nordic Hamstring Exercise training induces improved lower-limb swing phase mechanics and sustained strength preservation in sprinters

AU - Alt, Tobias

AU - Severin, Jannik

AU - Komnik, Igor

AU - Nodler, Yannick

AU - Benker, Rita

AU - Knicker, Axel

AU - Brüggemann, Gert-Peter

AU - Strüder, Heiko Klaus

PY - 2020

Y1 - 2020

N2 - Nordic Hamstring Exercise (NHE) training improves eccentric hamstring strength and sprint performance. However, detraining causes rapid reductions of achieved adaptations. Furthermore, the transfer of improved hamstring capacity to swing phase mechanics of sprints is unknown. This longitudinal study aimed (1) to quantify NHE-induced adaptations by camera- based isokinetic assessments and sprint analyses, (2) to relate the magnitude of adaptations to the participants’ initial performance level, (3) to investigate the transferability to sprints, and (4) to determine strength preservations after three months. Twelve sprinters (21 y, 1.81 m, 74 kg) were analysed throughout 22 weeks. They performed maximal sprints and eccentric knee flexor and concentric knee extensor tests before and after a 4-week NHE training. Sprints and isokinetic tests were captured by ten and four high-speed cameras. The dynamic control ratio at the equilibrium point (DCRe) evaluated thigh muscle balance. High- intensity NHE training elicited significant improvements of hamstring function (p range: <0.001 to 0.011, d range: 0.44 to 1.14), thigh muscle balance (p<0.001, d range: 0.80 to 1.08) and hamstring-related parameters of swing phase mechanics (p range: <0.001 to 0.022, d range: 0.12 to 0.57). Sprint velocity moderately increased (+1.4%, p<0.001, d=0.26). Adaptations of Hecc hamstring function and DCRe thigh muscle balance revealed moderate to strong transfers to improved sprint mechanics (, p range: <0.001 to 0.048, R2 range: 34% to 83%). The weakest participants demonstrated the highest adaptations of isokinetic parameters (p range: 0.003 to ≤0.023, R2 range: 42% to 62%), whereas sprint mechanics showed no effect of initial performance level. Three months after the intervention, hamstring function (+6% to +14%) and thigh muscle balance (+8% to +10%) remained significantly enhanced (p<0.001, ƞp2 range: 0.529 to 0.621). High-intensity NHE training induced sustained, improved hamstring function of sprinters, which can be transferred to swing phase mechanics of maximal sprints. The initial performance level, NHE training procedures and periodisation should be considered to optimize adaptations.

AB - Nordic Hamstring Exercise (NHE) training improves eccentric hamstring strength and sprint performance. However, detraining causes rapid reductions of achieved adaptations. Furthermore, the transfer of improved hamstring capacity to swing phase mechanics of sprints is unknown. This longitudinal study aimed (1) to quantify NHE-induced adaptations by camera- based isokinetic assessments and sprint analyses, (2) to relate the magnitude of adaptations to the participants’ initial performance level, (3) to investigate the transferability to sprints, and (4) to determine strength preservations after three months. Twelve sprinters (21 y, 1.81 m, 74 kg) were analysed throughout 22 weeks. They performed maximal sprints and eccentric knee flexor and concentric knee extensor tests before and after a 4-week NHE training. Sprints and isokinetic tests were captured by ten and four high-speed cameras. The dynamic control ratio at the equilibrium point (DCRe) evaluated thigh muscle balance. High- intensity NHE training elicited significant improvements of hamstring function (p range: <0.001 to 0.011, d range: 0.44 to 1.14), thigh muscle balance (p<0.001, d range: 0.80 to 1.08) and hamstring-related parameters of swing phase mechanics (p range: <0.001 to 0.022, d range: 0.12 to 0.57). Sprint velocity moderately increased (+1.4%, p<0.001, d=0.26). Adaptations of Hecc hamstring function and DCRe thigh muscle balance revealed moderate to strong transfers to improved sprint mechanics (, p range: <0.001 to 0.048, R2 range: 34% to 83%). The weakest participants demonstrated the highest adaptations of isokinetic parameters (p range: 0.003 to ≤0.023, R2 range: 42% to 62%), whereas sprint mechanics showed no effect of initial performance level. Three months after the intervention, hamstring function (+6% to +14%) and thigh muscle balance (+8% to +10%) remained significantly enhanced (p<0.001, ƞp2 range: 0.529 to 0.621). High-intensity NHE training induced sustained, improved hamstring function of sprinters, which can be transferred to swing phase mechanics of maximal sprints. The initial performance level, NHE training procedures and periodisation should be considered to optimize adaptations.

UR - https://www.mendeley.com/catalogue/41a9cd1e-97e7-32f9-8022-f9f4b0cf4817/

U2 - 10.1111/sms.13909

DO - 10.1111/sms.13909

M3 - Journal articles

JO - Scandinavian journal of medicine & science in sports

JF - Scandinavian journal of medicine & science in sports

SN - 1600-0838

SN - 0905-7188

ER -

ID: 5535423