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- W2901529948 abstract "Dear Editor-in-Chief, In their recent article published in this journal, Ruddy et al. (1) developed a supervised (machine) learning model to predict the occurrence of hamstring strain injuries (HSI). The measure of strength during lengthening (eccentric) contractions used in this model was derived from the Nordic hamstring exercise (NHE). Unfortunately, the predictive performance was just slightly better than random. Although the exact causes of HSI remain unknown and many risk factors may affect the occurrence of HSI, the specific mechanical parameter that causes injury most likely is either overstrain or overstress or both, during high-speed eccentric contractions (2,3). While we believe that overstrain may not be the direct cause for HSI during high speed sprinting (4) and strong lengthening force could withstand the forceful stretch which may cause strain injury, eccentric strength tested in NHE does not reflect the high eccentric force occurred during high-speed sprinting. Hamstring strain injuries could occur in the late swing phase or early stance phase during high-speed sprinting (5). In either phase, the biceps femoris long head muscle is being stretched much longer, compared with a neutral hip joint and a flexed knee joint in NHE. Accordingly, the hamstrings are stretched at both the knee and the hip joints during sprinting, but they are only stretched at the knee joint during NHE. Therefore, Guex and Millet (6) had proposed that high-load eccentric exercises at the knee joint should be performed when the hip was kept in a large flexion position to expose the hamstrings to great elongation stress. Furthermore, the hamstring muscles have different insertion sites and do not elongate at the same length and speed during sprinting (7). Therefore, shear stress during elongation may cause injuries. However, slower muscle contraction within a shorter muscle length will not cause uneven length, speed, and load distribution within the muscle. Last, but not the least, NHE will not lead to the potential heavy muscle load, which has been estimated during high-speed running. A study (8) found that Nordic training for 6 wk does not increase eccentric strength. We believe that the prediction of HSI could be much improved if more realistic (greater range of motion with faster speed and greater stress) hamstring eccentric strength tests were used during the modeling process. Li Li Department of Health Sciences and Kinesiology Georgia Southern University Statesboro, GA Mianfang Ruan College of Physical Education Ningbo University Ningbo, Zhejiang, PEOPLE’S REPUBLIC OF CHINA" @default.
- W2901529948 created "2018-11-29" @default.
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- W2901529948 date "2018-12-01" @default.
- W2901529948 modified "2023-09-27" @default.
- W2901529948 title "Nordic Exercise Should Not Be Used for Predictive Modeling of Hamstring Injuries" @default.
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- W2901529948 doi "https://doi.org/10.1249/mss.0000000000001727" @default.
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