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The latest inervation in human performance measurement.
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Read the Full StoryEndurance / Fatigue
Contractional Work:
All described in standard international units Joules (J) which is a measure of energy and work (rather than force). It is equal to the energy expended (or work done) in applying a force of one newton through a distance of one metre (1 newton metre or N·m),
A measure of the energy expended by the muscle/s under test and considered by some authorities to reflect endurance. However, difficulties in assessing the importance of strength (or lack of) and endurance during the interpretation of these results makes their use questionable for research purposes but good for rehabilitation.
Initial peak torque:
The average of the first three reps of an endurance test
Final peak torque:
The average of the final three reps of an endurance test
Fatigue index:
Combining the above two measures this is the percentage that peak torque declined during the endurance test. It uses a simple Chi-Squared test by subtracting initial peak torque from final peak torque then dividing that by the initial peak torque again this is then multiplied by 100 to give a percentage out of 100.
Any figure under 100 means the subject fatigued (the lower the figure the more the fatigue e.g. a fatigue ratio of 65% means the subject tired by 35% during the test).
Note a negative number means the subject got stronger during the test not weaker.
Endurance or Fatigue ratio:
The ratio of total work from the first half of the set divided by the work from the last half of the set multiplied by 100. This is a more reliable fatigue measure.
Declined Work
The most widely used endurance measure. The amount of work performed over a set number of repetitions is recorded. These tests have been said to be absolute endurance measures which should be used in research settings (Kannus 1994). The trouble starts when subjects can not reach the set number of repetitions required.
Time to 50% of peak torque.
The amount of time it took took to reach 50% of the initial peak toque values. The actual percentage can often be altered (Cybex Norm) with 40% becoming a popular number used. This measure shows the point where the type II (a and b) muscle fibres stop working and the effort is all form the type I fibres.
Work to 50% peak torque:
The amount work produced up to the point where torque levels fell below 50%
Power to 50% peak toque:
The power produced before peak torque fell below 50% maximum
