As in all the examples given, the essential features defining different uses of
MET are:
• the amount of effort used in the contraction
• the amount of effort used in restraining a contraction, i.e. whether the
contraction is matched (isometric) or overcome (isotonic eccentric) or only
partially resisted (isotonic concentric).
The other major variables which are controllable are, of course, how long the
contraction is allowed to continue and how often it is repeated.
• The degree of effort in isometric contractions should always be much less than
the full force available from the muscles involved. The initial contraction
should involve a quarter or less of the strength available. This, of course, will
not be an exact measurement but indicates that a wrestling match should never
develop between the contracting area and the counterforce, whether this be a
hand, a piece of furniture, another person’s hands or gravity.
• After the initial, slowly commenced contraction, subsequent contractions
may involve an increase in effort but should never reach more than half of
the full strength of that muscle. We want above all to achieve a controlled
degree of effort at all times and this calls for the use of only part of the
available strength in a muscle or muscle group.
• The timing of isometric contractions is usually such as to allow at least 5 and
up to 10 seconds for the contraction, from beginning to end.
• It is important to remember that the start and the end of contraction should
always be slow. There should never be a snatching or a quick beginning or
end to the contraction. Always attempt a smooth build-up of power in the
muscle(s) and a slow switch-off of the contraction at the end. This will
prevent injury or strain and produces the best possible results.
• In some cases slightly shorter periods of time are suggested for the
contractions and in others they will be longer. Indeed, in many instances
there is a variation as the therapy progresses, with even longer periods of time
involved, although 30 seconds would be a top limit, unless otherwise stated
in the text. It is far safer and more effective to contract a muscle for a longer
period than it is to make the contraction stronger.
As in all the examples given, the essential features defining different uses ofMET are:• the amount of effort used in the contraction• the amount of effort used in restraining a contraction, i.e. whether thecontraction is matched (isometric) or overcome (isotonic eccentric) or onlypartially resisted (isotonic concentric).The other major variables which are controllable are, of course, how long thecontraction is allowed to continue and how often it is repeated.• The degree of effort in isometric contractions should always be much less thanthe full force available from the muscles involved. The initial contractionshould involve a quarter or less of the strength available. This, of course, willnot be an exact measurement but indicates that a wrestling match should neverdevelop between the contracting area and the counterforce, whether this be ahand, a piece of furniture, another person’s hands or gravity.• After the initial, slowly commenced contraction, subsequent contractionsmay involve an increase in effort but should never reach more than half ofthe full strength of that muscle. We want above all to achieve a controlleddegree of effort at all times and this calls for the use of only part of theavailable strength in a muscle or muscle group.• The timing of isometric contractions is usually such as to allow at least 5 andup to 10 seconds for the contraction, from beginning to end.• It is important to remember that the start and the end of contraction shouldalways be slow. There should never be a snatching or a quick beginning orend to the contraction. Always attempt a smooth build-up of power in themuscle(s) and a slow switch-off of the contraction at the end. This willprevent injury or strain and produces the best possible results.• In some cases slightly shorter periods of time are suggested for thecontractions and in others they will be longer. Indeed, in many instancesthere is a variation as the therapy progresses, with even longer periods of timeinvolved, although 30 seconds would be a top limit, unless otherwise statedin the text. It is far safer and more effective to contract a muscle for a longerperiod than it is to make the contraction stronger.
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