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Related Concept Videos

Isotonic and Isometric Muscle Contractions01:22

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
Muscles of the Shoulder01:23

Muscles of the Shoulder

The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...

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Related Experiment Video

Updated: Jul 14, 2026

Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Isometric Shoulder Testing Using a Forcemeter Is a Reliable Method of Strength Evaluation.

Joanna Wałecka1,2, Przemysław Lubiatowski1,2, Ewa Bręborowicz2

  • 1Rehasport Clinic, 60-201 Poznań, Poland.

Sensors (Basel, Switzerland)
|November 25, 2023
PubMed
Summary

Digital dynamometers offer reliable muscle function evaluation, objectifying strength assessments. The Forcemeter demonstrated good intra- and inter-observer reliability for shoulder strength testing in healthy volunteers.

Keywords:
Forcemeterisometric strengthreliabilityshoulder strength

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Manual muscle strength assessment lacks objectivity.
  • Digital dynamometers provide a reliable method for quantifying muscle function.
  • The Forcemeter is a user-friendly digital dynamometer for objective strength measurement.

Purpose of the Study:

  • To evaluate the intra- and inter-observer reliability of the Forcemeter for shoulder isometric strength testing.
  • To assess the utility of a computer program for monitoring and storing dynamometer measurements.

Main Methods:

  • Isometric strength testing of shoulder abduction, forward flexion, and internal/external rotation was performed on 20 healthy volunteers.
  • The Forcemeter was used, with measurements recorded in newtons.
  • Three tests were conducted per participant: two by Examiner A (intra-rater) and one by Examiner B (inter-rater).

Main Results:

  • High intra-class correlation coefficient (ICC) values (r = 0.66–0.93) indicated good intra-observer reliability for both examiners.
  • Moderate to high correlations (r = 0.72–0.91) were observed between Examiner A's results, demonstrating good inter-observer reliability.
  • The computer program effectively monitored and stored measurement data.

Conclusions:

  • The Forcemeter is a reliable tool for objective isometric shoulder strength assessment.
  • The digital dynamometer and its associated software ensure consistent and reproducible muscle function evaluations.
  • This technology aids in precise tracking of strength changes in clinical and research settings.