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Midterm

BPK 142 Study Guide - Midterm Guide: Dynamometer, Bench PressPremium

3 pages51 viewsSpring 2018

Department
Biomedical Physio & Kines
Course Code
BPK 142
Professor
Brent Flodin
Study Guide
Midterm

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Muscle Strength:
Muscular strength - the greatest amount of force that muscles can produce in a single maximal
effort.
- Tests
B. Strength Testing Techniques
1. a. One Repetition Maximum - maximum amount of weight lifted once. Use free weights or
machines that allow dynamic muscle contractions.
Nautilus Machines - accommodating resistance devices - leverage characteristics change as
the joint goes through a range of motion so that the muscle is stressed more at more optimal
joint angles.
1.b. Variable Repetition Maximum – estimation of one repetition maximum from repetitions to
failure with free weights or machines
Safer than using 1 RM for novices and recreational athletes
1 RM = (weight lifted) / [1.0278 – (n X 0.0278)]
n = repetitions to failure (not to exceed 10)
e.g. bench press 40 kg 8 times before failing
1 RM = (40) / [1.0278 – (8 X .0278)] = 50 kg
2. Dynamometer Techniques - a strength testing dynamometer usually consists of a spring of
some type which is deformed a certain amount when a specific force is applied to it. (eg) - hand
grip dynamometer , Jackson Strength Evaluation System
- measures isometric strength
- relatively inexpensive, high reliability if body position is carefully standardized for each trial of
the test
3. Computer-Assisted, Isokinetic Methods - equipment such as Biodex, and Kin-Com.
- isokinetic machine, but many of these machines can also test strength in isometric, concentric,
and eccentric modes
- has a computer which can be programmed at any initial and final force, angle, velocity, or
number of repetitions.
- measure peak torque using a force transducer and joint angle using an electrogoniometer.
- extensive manipulations can be performed on collected data using computer software
- accurate and reliable, but expensive
Safety issues
• SLOW DOWN THE MUSCLE LOSS THAT NORMALLY ACCOMPANIES THE AGING
PROCESS --> INCREASE FUNCTIONAL MOBILITY SO THAT DAILY ACTIVITIES ARE MADE
BOTH POSSIBLE AND EASIER
• INCREASE THE SIZE AND STRENGTH OF MUSCLE FIBERS RESULTING IN A GREATER
PHYSICAL CAPACITY TO PERFORM WORK
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