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  • Author: Bonnie L. Van Lunen x
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The Effectiveness of Nordic Hamstring Exercises in Reducing Hamstring Injuries in Competitive Soccer Players: A Critically Appraised Topic

Jennifer W. Cuchna, Lauren Welsch, Taylor Meier, Chyrsten L. Regelski, and Bonnie Van Lunen

Clinical Question:

Are Nordic hamstring exercises more effective than standardized training in reducing hamstring strain injury rates in competitive soccer players over the course of at least one season?

Clinical Bottom Line:

The evidence supports the use of Nordic hamstring exercises to reduce hamstring injury incidence rates over a competitive soccer season. Therefore, progressive Nordic hamstring exercises should be included within some aspect of a practice to prevent the occurrence of hamstring injuries.

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Comparison of Isometric Portable Fixed Dynamometry to Isokinetic Dynamometry for Assessment of Hip Strength

Roger O. Kollock Jr., Bonnie Van Lunen, Jennifer L. Linza, and James A. Onate


Assessment of hip strength can be performed with either isokinetic or isometric testing procedures, but the degree of association between values derived from the alternative testing methods has not been previously documented.


To investigate the relationship between isometric peak torque and isokinetic peak torque at 60°·s-1 for various hip motions.


Eighteen physically active males (N = 9) and females (N = 9) participated (22 ± 3 years, 173.0 ± 10.5 cm, 73.8 ± 16.7 kg).


Three isokinetic repetitions at 60°·s-1 and three isometric contractions of 5 s each for the hip fexors (HFs), hip extensors (HEs), hip abductors (ABs), hip adductors (ADs), hip external rotators (ERs), and hip internal rotators (IRs).

Outcome Measures:

Pearson correlation coefficients and coefficients of determination were calculated for both absolute and allometric-scaled peak torque values.


Meaningful associations between isometric and isokinetic peak torque values were found for each hip motion. Allometric-scaled strength values demonstrated stronger correlations than absolute strength values.


The results suggest that portable fixed isometric testing of hip strength is an alternative to isokinetic testing at 60°·s-1.