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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Design an experiment using rats to determine whether endurance training alters the proportion of slow, fast aerobic, and fast anaerobic muscle fibers.

Summary Introduction

To review:

An experiment using rats to determine whether endurance training alters the proportion of slow, fast aerobic, and fast anaerobic muscle fibers.

Introduction:

Generally, muscle fibers are of three types: Slow muscle fibers contract slowly but do not fatigue rapidly. Fast aerobic fibers contract relatively quickly and vigorously, but fatigue quickly than slow fibers. Fast anaerobic fibers contract rapidly and vigorously than fast aerobic fibers but fatigue rapidly. The number of mitochondria in fiber determines its capacity to produce ATP.

Explanation

The study was conducted on nine rats to calculate absolute and relative masses of the three types of skeletal muscle fibers in the total hind limb of the male rat. The total body mass of rats was recorded and weights were taken from dissection of one hind limb major muscles or muscle parts, remaining skeletal musculature (intrinsic foot muscles), bone, inguinal fat pad. The fibers from hind limb skeletal muscle mass were classified from histochemistry as slow, fast aerobic, and fast anaerobic and their populations were determined. Mass of each of the fiber types within muscles and in the total hind limb was calculated from fiber-type population, fiber-type area, and muscle-mass data. Skeletal muscle made up 65% of the total hind limb mass...

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