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International Journal of Human Movement and Sports Sciences Vol. 13(2), pp. 470 - 478
DOI: 10.13189/saj.2025.130225
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Ensuring Consistency and Examining the Reliability of Isokinetic and Isometric Knee Extension Strength Testing in Older Women over a Four-Week Interval

Chawin Sarinukul ^1,2, Taweesak Janyacharoen ^1,2,*, Lee David Johnson ¹, Buranat Audsavachulamanee ¹, Thiwaphon Chatprem ^1,2, Saowanee Nakmareong ¹, Paradee Auvichayapat ³, Kittisak Sawanyawisuth ^4
1 Department of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University, Thailand
² Research Center in Back, Neck and Other Joint Pain and Human Performance, Khon Kaen University, Thailand
³ Department of Physiology, Faculty of Medicine, Khon Kaen University, Thailand
⁴ Department of Internal Medicine, Faculty of Medicine, Khon Kaen University, Thailand

ABSTRACT

This study evaluates the inter-session reliability of isokinetic knee extension testing at 60掳/s and 180掳/s, along with isometric testing, over four weeks in older women. Sixteen participants, averaging 62.75 years, underwent assessments using a Biodex System 4 Pro dynamometer at baseline and after 30 days. The testing protocols included isometric (3 repetitions at 90掳 knee flexion) and isokinetic (maximal contractions at both speeds) assessments. Results showed non-significant increases in peak torque for isometric (0.92%) and isokinetic (60掳/s: 4.13%) tests, while the 180掳/s test demonstrated a significant increase (5.24%). Intraclass Correlation Coefficients (ICCs) ranged from 0.55 to 0.94 for isometric tests and from 0.62 to 0.97 for isokinetic tests, indicating moderate to excellent reliability. The Standard Error of Measurement percentage was lowest for isometric tests (3.24%) and highest for the 180掳/s tests (8.23%). Bland-Altman analysis revealed small mean biases across all tests, suggesting that both isometric and isokinetic extension strength assessments exhibit reliable test-retest performance in older women. The findings have significant implications for accurately evaluating the effectiveness of interventions and rehabilitation programs tailored for older women, allowing for precise monitoring of strength changes and progress.

KEYWORDS
Isometric Strength, Isokinetic Strength, Older Women

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Chawin Sarinukul , Taweesak Janyacharoen , Lee David Johnson , Buranat Audsavachulamanee , Thiwaphon Chatprem , Saowanee Nakmareong , Paradee Auvichayapat , Kittisak Sawanyawisuth , "Ensuring Consistency and Examining the Reliability of Isokinetic and Isometric Knee Extension Strength Testing in Older Women over a Four-Week Interval," International Journal of Human Movement and Sports Sciences, Vol. 13, No. 2, pp. 470 - 478, 2025. DOI: 10.13189/saj.2025.130225.

(b). APA Format:
Chawin Sarinukul , Taweesak Janyacharoen , Lee David Johnson , Buranat Audsavachulamanee , Thiwaphon Chatprem , Saowanee Nakmareong , Paradee Auvichayapat , Kittisak Sawanyawisuth (2025). Ensuring Consistency and Examining the Reliability of Isokinetic and Isometric Knee Extension Strength Testing in Older Women over a Four-Week Interval. International Journal of Human Movement and Sports Sciences, 13(2), 470 - 478. DOI: 10.13189/saj.2025.130225.