This document provides an introduction to biomechanics, which is the study of forces acting on the human body and the effects produced by these forces. Biomechanics uses principles of anatomy and physics to describe and analyze human movement. It examines kinematics, which describes motion without reference to forces, and kinetics, which examines the causes of motion including internal and external forces. Biomechanics has applications in areas like sports science, ergonomics, rehabilitation, and prosthetics. The document outlines various biomechanical concepts including rigid body mechanics, segmental analysis, and different types of motion. It also discusses methods of acquiring biomechanical data like video analysis.
Applied Biomechanics – a multifaceted approach to answering human movement qu...InsideScientific
Experts review the basic principles of biomechanics and how the study of human movement has evolved over time. Presenters highlight examples in applied kinematics, applied kinetics and applied neuromuscular/motor control and demonstrate how methodologies vary depending on the field of study or area of expertise.
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Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
Applied Biomechanics – a multifaceted approach to answering human movement qu...InsideScientific
Experts review the basic principles of biomechanics and how the study of human movement has evolved over time. Presenters highlight examples in applied kinematics, applied kinetics and applied neuromuscular/motor control and demonstrate how methodologies vary depending on the field of study or area of expertise.
Ekeeda Provides Online Civil Engineering Degree Subjects Courses, Video Lectures for All Engineering Universities. Video Tutorials Covers Subjects of Mechanical Engineering Degree. Visit us: https://ekeeda.com/
Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
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These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
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is the oldest recreational drug and likely contributes to more morbidity,
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5th edition of the Diagnostic and Statistical Manual of Mental Disorders
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disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
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2. AN INTRODUCTION TO THE STUDY AND
ANALYSIS OF HUMAN MOVEMENT
During the past decade the term
BIOMECHANICS has emerged as an area of
inquiry in the sport science domain.
Biomechanics is based on NEWTON'S LAWS and
involves the study of the motion of bodies and
the interrelationships among the forces acting
on these bodies.
3. INTRODUCTION TO THE STUDY AND ANALYSIS
OF HUMAN MOVEMENT
BIOMECHANICS: BIO = LIVING
MECHANICS = FORCES & EFFECTS
The application of mechanics to the living organism
Involves the principles of anatomy and physics in the
descriptions and analysis of movement.
Has many diverse applications to all biological systems
The study of biological structures, processes and
functions by applying the methods and principles of
mechanics
4. HAY, 1995
THE SCIENCE THAT EXAMINES THE
INTERNAL AND EXTERNAL FORCES
ACTING ON THE BODY AND THE EFFECTS
PRODUCED BY THESE FORCES
KINEMATICS & KINETICS
6. AREAS OF STUDY, RESEARCH
AND PRACTICE
Sport and Exercise Science
Coaching
Ergonomics
Equipment Design
Gait & Locomotion
Orthopedics - Rehabilitation -
Physiotherapy, Occupational
Therapy
Prosthetics and Orthotics
Motor Control
Computer Simulation
9. MECHANICS
Rigid body mechanics are based on the
assumption that a solid body is considered
to be a rigid body if the distance between
the particles remains fixed when a force is
applied.
11. SEGMENTAL ANALYSIS
We often make the assumption
that the human skeleton can
be represented as a series of
links. Researchers have used
everything from cones to
spheres to form the links
which best approximated the
complexity of the human body.
However, by far the most
widely adopted and simplest
link system representation is
the stick man.
12.
13.
14. The stick man uses straight sticks to represent each of
the links. In any case, regardless of the shapes which
are used we also make the assumption that the human
link system is a system of rigid bodies connected at the
joints
15. Figure 3.
Rigid Body Mechanics
kinematics kinetics
linear curvilinear statics dynamics
angular parabolic
16. KINETICS
examines the causes of motion, the
internal and external forces that cause
motion or cause a body to remain at rest,
and the interactions between these forces.
There are two branches of kinetics;
STATICS and DYNAMICS
17. KINEMATICS
Describes the motion
of a body without
reference to the
forces causing it.
Kinematics examines
how, when, and
where a body moves.
18. For example, variables such as the
displacement of a ball, the velocity of a
skater, and the acceleration of the free leg
all describe motion, and are kinematic
variables.
19. We classify the kinematic motion
according to the pathway it takes.
Movement may be LINEAR,
CURVILINEAR, or a combination of
the two. Curvilinear motion can be
further specified as ANGULAR or
PARABOLIC.
20. LINEAR MOTION
Linear motion is the
movement of a body in a
straight line or along a
straight pathway. Linear
motion is also produced
when external forces are
applied directly through the
centre of mass of an body.
22. ANGULAR: Angular motion takes place
when a body moves along a circular
path about some AXIS in space. This
axis is known as the axis of rotation.
Angular motion is produced when
forces are applied away from the axis of
rotation of a body.
23.
24. Our body limbs are able to rotate about
the joints because all of our muscles are
attached at some distance from the centre
of the joints.
25. PARABOLIC: Bodies
which are projected
into the air will
assume a
PARABOLIC PATH
and are governed by
the laws of projectile
motion.
26. STATICS: Statics refers to situations
where the body or object remains at rest,
or is moving at a constant speed in a state
of equilibrium. Equilibrium is a balanced
state in which there is no acceleration.
27. DYNAMICS: Dynamics deals with the
changes in motion brought on by
unbalanced forces.
28. QUANTITATIVE VS QUALITATIVE
Both kinematics and kinetics can be analyzed
using a quantitative or qualitative approach
A quantitative analysis requires a numerical
evaluation of an individual’s movement
Qualitative analysis involves a systematic
analysis of movement based on biomechanical
concepts but without actual measurement
29. METHODS OF ACQUIRING
DATA
1. VIDEO ACQUISITION
2 D or 3D
Points are digitized manually or by attaching
reflective markers and digi auto
2. 3 D OPTICAL ACQUISITION
3D in controlled environment
Marker only system that uses 2 – 12 cameras and
infra red lights to collect 3D coordinates
3. ANALOG ACQUISITON
analog sampling from force platforms, EMG or
other devices.
Can be integrated with video or 3D optical
32. SOME QUESTIONS that may
require quantitative video
analysis?
1. An objective of prescribing an
orthosis is usually to improve the
function of the patient. How can we
determine if the use of a foot orthotic is
correcting for the severe pronation
exhibited by a patient?
Video tape, digi and compare joint
angular displacement throughout stride
33. Hydro workers
Hydro workers are required to lean out of
a lift to repair the lines. The action of
leaning and working from a distance puts
dangerous loads on the lower back –
injury.
How can the lift be modified to reduce the
risk of injury?
34. EMG
BASED ON RELATIONSHIP BETWEEN
FORCE AND THE ELECTRICAL ACTIVITY
ACROSS THE MUSCLE MEMBRANE
EXAMPLE: Which exercise is best for
rehabilitation of a particular muscle?
40. QUALITATIVE ANALYSIS
Qualitative analysis involves a systematic
analysis of movement based on
biomechanical concepts but without actual
measurement
41. What does the QA process
include?
Is there a technique error?
What are the mechanical concepts that
govern specific parts of the skill?
What the critical features of the
performance?
What is the best observation strategy?
How do you detect errors in performance
and remediate?
42. Sally, a powerful outside hitter on a high
school volleyball team, has been out for
two weeks with mild shoulder bursitis, but
has recently received her physicians
clearance to return to practice. The coach
notices that Sally’s spikes are traveling at
a slow speed and are being easily handled
by the defensive players?????