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Related Concept Videos

Distance Problem01:29

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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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Related Experiment Video

Updated: Mar 21, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
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Dynamic Parameters Variability: Time Interval Interference on Ground Reaction Force During Running.

Juliana Pennone1, Bruno Mezêncio2, Alberto C Amadio2

  • 1Laboratory of Biomechanics - School of Physical Education and Sports (EEFE-USP), São Paulo, Brazil juliana.pennone@usp.br.

Perceptual and Motor Skills
|May 12, 2016
PubMed
Summary
This summary is machine-generated.

The time between running measurements did not significantly affect ground reaction force variability. This consistency ensures reliable data for repeated measures in biomechanical studies.

Keywords:
ground reaction forcerunningvariability

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement Analysis

Background:

  • Understanding running biomechanics is crucial for injury prevention and performance enhancement.
  • Ground reaction forces (GRF) are key indicators of running gait and variability.
  • Assessing the reliability of GRF measures is essential for longitudinal studies.

Purpose of the Study:

  • To investigate the impact of a seven-day interval between running sessions on ground reaction force (GRF) variability.
  • To determine if the time between measurements influences the reliability of GRF parameters.
  • To establish the consistency of GRF measures in repeated running trials.

Main Methods:

  • Fifteen healthy male participants ran at 9 km/hr for 45 minutes in two separate sessions, one week apart.
  • Ground reaction forces were recorded every 5 minutes during each running session.
  • Coefficients of variation for key GRF parameters were calculated and compared between the two sessions.

Main Results:

  • The coefficients of variation for GRF parameters were similar between the two sessions (21.9% vs. 21.48%).
  • No significant differences were found in specific GRF parameters (Fy1, tFy1, TC1, Imp50, Fy2, tFy2) between intervals and sessions.
  • GRF variability remained consistent despite the seven-day interval, indicating high reliability.

Conclusions:

  • A seven-day interval between running measurements does not significantly alter ground reaction force variability.
  • The findings support the reliability of using repeated measures of GRF in running studies.
  • Consistent GRF measures ensure the validity of biomechanical analyses in longitudinal research.