Effect of Sampling Frequency on a Unilateral Isometric Hamstring Strength Assessment Using Force Plates
Nicholas J Ripley , J. J. McMahon , P Comfort
Journal of Science in Sport and Exercise ›› 2026, Vol. 8 ›› Issue (3) : 292 -300.
The purpose of this study was to determine the effect of sampling frequency on the 90–90° (90-degrees hip and knee flexion) isometric hamstring assessment. Thirty-three elite female soccer players (age: 18.7 ± 3.7 years; height: 158.3 ± 5.9 cm; body mass: 62.8 ± 5.5 kg) performed three unilateral trials on a single occasion of the 90–90° isometric hamstring assessment. Force-time data were collected using force plates at 1000 Hz and down sampled to 500-, 250-, and 100 Hz. Peak force (N), force (N) at 100- and 200 ms and average rate of force development (aRFD) (N/s) over a 100- and 200 ms epoch were calculated. A repeated measures of analysis of variance and effect size was used to compare means. Excellent absolute and good relative reliability was observed for peak force across all sampling frequencies. Force at 100- and 200 ms and aRFD over 100 ms and 200 ms resulted poor-moderate relative reliability and poor-excellent absolute reliability. No significant trivial differences were observed for peak force between sampling frequencies (P > 0.05, Cohen’s d = 0.02–0.12). A significant difference (P < 0.001) was identified in 500, 250 and 100 Hz, with small-moderate and small-large increases in force at set time points and aRFD, respectively, in comparison to 1000 Hz (d = 0.21–2.00). Higher sampling frequencies (> 500 Hz) reduces the reliability of time dependent force characteristics, with minimal effect on peak force. Regular monitoring of peak force can be performed with higher sampling frequencies, but lower sampling frequencies would be beneficial to collect reliable rapid-force generating measures.
Isometric hamstring strength testing / Force plate sampling frequency / Force plate reliability
| [1] |
|
| [2] |
Aiello F, Di Claudio C, Fanchini M, Impellizzeri FM, McCall A, Sharp C, Brown SJ. Do non-contact injuries occur during high-speed running in elite football? Preliminary results from a novel GPS and video-based method. Journal of Science and Medicine in Sport. 2023;26(9):465–70. |
| [3] |
|
| [4] |
Bettariga F, Bishop C, Martorelli L, Turner A, Lazzarini SG, Algeri C, Maestroni L. Acute effects of a fatiguing protocol on peak force and rate of force development of the hamstring muscles in soccer players. J Sci Sport Exerc. 2023. https://doi.org/10.1007/s42978-023-00228-x |
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
Hopkins W. A scale of magnitudes for effect statistics. A new view of statistics. 2002. http://www.sportsci.org/resource/stats/. |
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
McCall A, Nedelec M, Carling C, Le Gall F, Berthoin S, Dupont G. Reliability and sensitivity of a simple isometric posterior lower limb muscle test in professional football players. J Sports Sci. 2015;33(12):1298–304. |
| [25] |
|
| [26] |
Nagano Y, Higashihara A, Edama M. Change in muscle thickness under contracting conditions following return to sports after a hamstring muscle strain injury - a pilot study. Asia-Pacific J Sports Med Arthrosc Rehabilitation Technol. 2015;2:63–7. |
| [27] |
|
| [28] |
Opar, Williams. Shield. Hamstring strain injuries: factors that lead to injury and re-injury. Sports Med. 2012;42(3):209–26. |
| [29] |
Panagodage Perera NK, Kountouris A, Kemp JL, Joseph C, Finch CF. The incidence, prevalence, nature, severity and mechanisms of injury in elite female cricketers: a prospective cohort study. J Sci Med Sport. 2019;22(9):2012–20. |
| [30] |
|
| [31] |
|
| [32] |
|
| [33] |
|
| [34] |
|
The Author(s)
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