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Related Experiment Video

Updated: Apr 25, 2026

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Intraday and Interday Reliability of Maximal and Explosive Handgrip Force-Time Metrics Using the Kinvent K-Grip

Ivan Curovic1, Milan Markovic2, Lazar Toskic2,3

  • 1Institute of Coaching and Performance, School of Health, Social Work and Sport, University of Lancashire, Preston PR1 2HE, UK.

Muscles (Basel, Switzerland)
|April 24, 2026
PubMed
Summary

The Kinvent K-Grip is reliable for measuring maximal handgrip strength and later-phase explosive force over time. However, early-phase explosive metrics show high variability, making them less suitable for tracking intervention effects.

Keywords:
explosive forceimpulseneuromuscular functionrate of force developmentstrength assessment

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Area of Science:

  • Neuromuscular Function
  • Biomechanics
  • Sports Science

Background:

  • Handgrip strength (HGS) is a key indicator of neuromuscular function.
  • HGS predicts health and performance outcomes.
  • Reliability of force-time metrics from handheld dynamometers requires evaluation.

Purpose of the Study:

  • To assess the intraday and interday reliability of maximal and explosive handgrip force-time metrics.
  • To evaluate the Kinvent K-Grip handheld dynamometer's performance.

Main Methods:

  • Thirty-four participants performed maximal voluntary isometric contractions over two days.
  • Force-time data analyzed for peak force, mean force, rate of force development (RFD), and impulse.
  • Reliability assessed using ICC, SEM, MDC, and CV%.

Main Results:

  • Excellent reliability for peak and mean force (ICC > 0.97).
  • Good-to-excellent reliability for later-phase explosive metrics (ICC = 0.88-0.99).
  • Moderate-to-good reliability for early-phase RFD metrics with high variability (ICC = 0.67-0.88).

Conclusions:

  • The K-Grip is reliable for maximal strength and later-phase force assessments.
  • It is suitable for cross-sectional studies and tracking significant strength improvements.
  • Early-phase explosive metrics are less reliable for monitoring interventions due to variability and fatigue sensitivity.