Applied anatomy and kinesiology, the mechanism of muscular movement . ength of grip. Theformer is useful to test a mans general strength, and requires butlittle time; if we wish to know how a mans strength is distributedwe have to use a form of dynamometer that will test the strength ofeach muscle group separately (Fig. 7). This method does not givethe actual pull of each muscle but its effective pull through its lever-age as it normally works; this can be compared with the strengthof other men, giving us after all a fair estimate of condition. Fig. 6.—Use of a dynamometer fortesting the gener
Applied anatomy and kinesiology, the mechanism of muscular movement . ength of grip. Theformer is useful to test a mans general strength, and requires butlittle time; if we wish to know how a mans strength is distributedwe have to use a form of dynamometer that will test the strength ofeach muscle group separately (Fig. 7). This method does not givethe actual pull of each muscle but its effective pull through its lever-age as it normally works; this can be compared with the strengthof other men, giving us after all a fair estimate of condition. Fig. 6.—Use of a dynamometer fortesting the general strength of themuscular system. 2fi MUSCULAR STRUCTURE AND ACTION A muscle can exert its greatest force when it is fully extended,and as it shortens its force diminishes. It follows that if we loada muscle with all it can lift it will be able to lift it but a short dis-tance. The question arises, how large a load should be put upona muscle if we wish it to work with best results? This is a problemfrequently tested out in the physiological laboratory, using the. Fig. —Use of a dynamometer for testing the strength of separate musclegroups. The abdominal group is being tested. (Kellogg.) muscles of frogs. The following table shows the type of resultuniformly obtained from this test. The muscle is given a constantstimulus: Weight. 0 . 1 . 2 . 3 . 4 . eight. Work. Weight 10 0 0 10 10 7 9 IS 8 8 24 9 7 28 . 10 6 30 11 MUSCULAR STRUCTURE AND ACTION 27 The column marked weight gives the number of gram weights usedto load the muscle in the successive tests; the figures for height are thenumbers of centimeters the weight was lifted; the figures for work arethe products of weight and height in gram-centimeters. Notice thatthe work accomplished is least with the lightest and heaviest weights,and is most when the weight is about half of what the muscle can means that when we use muscle to get work done it pays to takemoderate weights, avoidi
Size: 1232px × 2029px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksu, booksubjectphysicaleducationandtraining
