Nordic Hamstring Exercise training induces improved lower‐limb swing phase mechanics and sustained strength preservation in sprinters
نویسندگان
چکیده
Nordic Hamstring Exercise (NHE) training improves eccentric hamstring strength and sprint performance. However, detraining causes rapid reductions of achieved adaptations. Furthermore, the transfer improved capacity to swing phase mechanics sprints is unknown. This longitudinal study aimed (a) quantify NHE-induced adaptations by camera-based isokinetic assessments analyses, (b) relate magnitude participants' initial performance level, (c) investigate transferability sprints, (4) determine preservations after 3 months. Twelve sprinters (21 years, 1.81 m, 74 kg) were analyzed throughout 22 weeks. They performed maximal knee flexor concentric extensor tests before a 4-week NHE training. Sprints captured ten four high-speed cameras. The dynamic control ratio at equilibrium point (DCRe) evaluated thigh muscle balance. High-intensity elicited significant improvements function (P range: <.001-.011, d 0.44-1.14), balance < 0.001, 0.80-1.08) hamstring-related parameters <0.001-0.022, 0.12-0.57). Sprint velocity demonstrated small increases (+1.4%, P = 0.26). Adaptations revealed moderate strong transfers <0.001-0.048, R2 34%-83%). weakest participants highest 0.003-0.023, 42%-62%), whereas showed no effect level. Three months intervention, (+6% +14%) (+8% +10%) remained significantly enhanced ƞp2 0.529-0.621). induced sustained sprinters, which can be transferred sprints. procedures periodization should considered optimize
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ژورنال
عنوان ژورنال: Scandinavian Journal of Medicine & Science in Sports
سال: 2021
ISSN: ['0905-7188', '1600-0838']
DOI: https://doi.org/10.1111/sms.13909