By Robert L. Goldstein, Richard T. Cotton
Aerobics teacher guide: The source for workforce health teachers.
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Printed in United States of America. All rights reserved. Except for use in a review, the reproduction or utilization of this work in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including xerography, photocopying and recording, and in any information retrieval system, is forbidden without the written permission of the American Council on Exercise. O. org Design: Mires Design, John Ball Production: Mires Design, Gale Spitzley Photographer: John Johnson Anatomical Illustrations: James Staunton Variations Chapter Coordinator: Karen Kelly Duncanson Technical Consultants: Karen Kelly Duncanson, Deborah Ellison, Barbara Gauthier Glossary: Holli K.
A joint ligament (the fibrous band connecting bones) or joint capsule should not be stretched because to do so would lead to an unstable joint (joint laxity) and an increased risk of joint injury. Simple muscle stretch reflex arc: the stretch of the muscle spindle causes reflex contraction. Simple inverse stretch reflex arc: the stretch of Golgi tendon organ causes reflex inhibition (relaxation). 9 The muscle spindle and simple stretch reflex. ment of the joint. Sometimes these structures can become extremely taut, causing a reduction in the normal range of motion.
Muscle fiber distribution (fast twitch, intermediate, or slow twitch) is determined by genetic makeup. This is not to say, however, that metabolic capacity is unresponsive to activity lifestyle. All three types of muscle fibers are highly trainable; that is, they are capable of adapting to the specific metabolic demands placed on them. If a person regularly engages in low-intensity endurance activities, improvement is seen in aerobic capacity. Although all three types of muscle fibers will show some improvement in aerobic ability, the ST fibers will be most responsive to this kind of training and will show the largest improvement in aerobic capacity.