Isometric Muscle Physiology Organ Chamber
Maintains isolated muscle bathed in oxygenated (95% O₂, 5% CO₂) physiological Ringer's solution.
Biomedical Engineering / Muscle Length-Tension Curve
FREE TO EXPLORELABORATORY 23 · BIOMEDICAL ENGINEERING
Skeletal Muscle Isometric Active Length-Tension Characteristic
Record isometric tetanic force in an isolated skeletal muscle preparation across normalized sarcomere lengths to evaluate the ascending active length-tension slope. Explore interactive physiological instrumentation simulation, biomechanics, and biomedical engineering telemetry.
BIOINSTRUMENTATION · BIOSIGNALS · BIOMECHANICS · IMAGING
Your virtual biomedical engineering laboratory.
ACTIVE ISOMETRIC TETANIC FORCE F_ACT—
PHYSIOLOGICAL & TEST CELL TELEMETRY
Ready to sample with Length Ratio λ = 0.85 ratio.
Adjust Length Ratio λ, then execute biomedical trial.
Biomedical engineering telemetry and physiological states are evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity biological and physiological modeling.
Biomedical assumptions and boundary condition limits
The linear model applies strictly to the ascending limb (λ ≤ 0.95); the plateau and descending limbs require piece-wise non-linear modeling. Evaluated on isolated amphibian gastrocnemius muscle (optimal resting length L_0 = 30.0 mm, mass 0.50 g) stimulated at 100 Hz tetanic trains in oxygenated Ringer's solution at 22 °C. Linear ascending limb slope k_m = 4.8000 N/ratio across stretch ratios λ from 0.70 to 0.95.
Biomedical apparatus & physiological sensors.
High-Resonance Isometric Force Transducer (0–10 N)
Measures muscle contractile force with sub-millisecond response and negligible compliance.
Micrometer Translation Stage (10 μm precision)
Sets precise muscle length increments and measures absolute muscle extension L.
Isolated High-Current Electrical Stimulator
Delivers supramaximal square-wave pulses (0.5 ms, 50 V) and tetanic trains (100 Hz, 500 ms).
Parallel Platinum Field Stimulation Electrodes
Provides uniform electric field across entire muscle belly ensuring synchronous fiber activation.
Dual-Channel Oscilloscope & High-Speed Data Acquisition
Digitizes stimulus pulses and tension waveforms at 10 kHz with active baseline subtraction.
FOLLOW THE METHOD
A reason behind every step.
Record isometric tetanic force in an isolated skeletal muscle preparation across normalized sarcomere lengths to evaluate the ascending active length-tension slope. Standardized parameter settings: 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 ratio.
01
Muscle Dissection and Organ Bath Mounting
Dissect gastrocnemius muscle with intact Achilles tendon, mount proximal bone clamp in bath, and tie Achilles tendon rigidly to force transducer with braided silk suture.
02
Optimal Length L_0 Determination
Deliver single twitch pulses while adjusting micrometer stage until maximum twitch force is identified, defining optimal resting length L_0.
03
Passive Force Baseline Subtraction
At each length step, record baseline resting tension (passive force F_pass) prior to electrical stimulation.
04
Tetanic Electrical Stimulation
Deliver a 100 Hz, 500 ms train of supramaximal square-wave pulses (25 V, 1 ms pulse width) and record total peak isometric force F_tot.
05
Active Force Computation across Ascending Limb
Calculate active force F_act = F_tot - F_pass across normalized length ratios λ = L/L_0 of 0.70, 0.75, 0.80, 0.85, 0.90, and 0.95, allowing 2 minutes rest between tetani.
06
Ascending Slope Linear Regression
Plot active isometric force F_act versus length ratio λ and calculate ascending slope k_m via linear regression.
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into biomedical engineering insight.
Points are your recorded observations. The solid regression line validates Muscle Length-Tension Curve mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
F_act = k_m · λ = 4.8000 · λ (ascending limb, L ≤ L₀)
| # | Normalized Muscle Length Ratio λ = L/L₀ (ratio) | Active Isometric Tetanic Force F_act (N) | Normalized length ratio λ = L/L₀ | Active isometric force F_act (N) | Remove |
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