2p90Lab5

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Brock University *

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2P90

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Mechanical Engineering

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Jan 9, 2024

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6

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KINE 2P90 Lab 5: Virtual Muscle Lab Assignment (20 marks total) Fill in the tables with your experimental data and then use the data to answer the questions and construct the various graphs describing the length vs tension (force), force vs frequency and force vs velocity relationships of skeletal muscle. Note that not every line in every table needs to be completed. PART 1. Tables & Graphs (10 marks: 4 marks for tables and 6 marks for graphs) Table 1: Force vs Stimulus Voltage Experiment Trial Voltage (volts) Active Force (grams) 1 0.5 0.00 2 1.5 0.43 3 2.5 0.87 4 3.5 1.19 5 4.5 1.42 6 5.5 1.59 7 6.5 1.70 8 7.5 1.78 9 8.5 1.82 10 9.5 1.82 Graph 1. Plot active force on y - axis vs. voltage on x - axis.
0 1 2 3 4 5 6 7 8 9 10 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Voltage (Volts) Active Force (Grams) Table 2: Force vs Frequency Experiment Trial Frequency (Hz) Active Force (grams) 1 5 2.21 2 15 2.90 3 25 3.97 4 35 4.71 5 45 5.20 6 55 5.64 7 80 6.11 8 105 6.15 9 130 6.18 10 Graph 2. Plot active force on y - axis vs. frequency on x-axis.
0 2 4 6 8 10 12 0 2 4 6 8 10 Frequency (Hz) Active Force (Grams) Table 3: Length Experiment Isometric Twitch Tension (grams) Trial Length (mm) Total Passive Active 1 50 0.11 0.00 0.11 2 55 0.73 0.00 0.73 3 60 1.21 0.00 1.21 4 65 1.55 0.00 1.55 5 70 1.75 0.00 1.75 6 75 1.82 0.00 1.82 7 80 1.77 0.02 1.75 8 85 1.63 0.08 1.55 9 90 1.46 0.25 1.21 10 95 1.41 0.68 0.73 11 100 1.86 1.75 0.11
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12 Graph 3 . Plot all forces (total, passive and active) on y - axis vs. length on x axis. This graph will have 3 different lines. 40 50 60 70 80 90 100 110 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Series2 Series4 Series6 Length (mm) Force (Grams) Series 1= total, Series 2= passive, Series 3= Active Table 4: Velocity vs Force Experiment Trial Load (grams) Active Force (grams) Velocity (mm/sec) 1 0.5 0.50 3.77 2 1 1.00 1.34 3 1.5 1.50 0.45 4 2 1.82 0.00 5 6
7 Graph 4 . Plot muscle shortening velocity on y - axis vs. force on x – axis (only force, not load). 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 0.5 1 1.5 2 2.5 3 3.5 4 Active Force (grams) Velocity (mm/sec) PART 2: Fill in the blanks ( 1 mark per blank) Choose the word or term that best describes your data (10 marks) Neural Experiments 1) In your experiment, maximum twitch force was first attained at __8.5__ volts. 2) The increase in twitch force amplitude with increasing voltage in your experiment is explained physiologically by the _______Orderly recruitment________ of __motor neurons__( 2 words). (2 marks) 3) In your experiment, a stimulation frequency of __80hz___ Hz produced a fully fused tetanus 4) The transition of twitches to tetani is termed _____summation_______ Mechanical Experiments 5) In your experiment, the optimal length for active tension (force) was ___75__% of maximum length. 6) In your experiment, active force was minimal at ___1.33__ % of optimal length when stretched. 7) At the optimal muscle/sarcomere length the greatest active force is possible due to the potential formation of the greatest number of ___overlap/crossbridge___
8) The maximum power for this muscle was achieved at ___27__ % of peak force. ( power is the product force and velocity) 9) The maximum power for this muscle was achieved at ___100__ % of peak velocity. ( power is the product force and velocity)
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