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KINS 2203 EMG Laboratory-
Updated Fall 2025 latest updated
version with 100% accurate
solutions
KIN3202-Biomechanics of Physical Activity
Yoga Posture Laboratory 1
Electromyography Laboratory
Introduction:
Skeletal muscles do the majority of the work for locomotion and support of
the skeleton. Each muscle is made up of individual muscle fibers organized
in fascicles (Figure 1).
Figure 1. Skeletal muscle structure.
Each individual fiber is innervated by a branch of a motor axon. Under
normal circumstances, a neuronal action potential activates all of the
muscle fibers innervated by the motor neuron and its axonal branches. The
motor neuron, together with all of the individual muscle fibers that it
innervates, is termed a motor unit (Figure 2).
This activation process involves the initiation of an action potential (either
voluntarily, or as a result of electrical stimulation of a peripheral nerve),
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conduction of the action potential along the nerve fiber, release of
neurotransmitter at the neuromuscular junction and depolarization of the
muscle membrane with resultant contraction of the muscle fibers.
Figure 2. The components of a motor unit.
Electromyography is a technique that measures the electrical activity of the
muscles and the nerves controlling the muscles. The data recorded is an
electromyogram (also known as an ‘EMG’ or
‘myogram’). There are two methods of recording: needle electrodes inserted
through the skin into the muscle or electrodes placed on the skin surface.
The size and shape of the waveform measured provide information about
the ability of the muscle to respond when the nerves are stimulated. In the
clinical setting, EMG is most often used when people have symptoms of
weakness, and examination shows impaired muscle strength. It can help to
differentiate muscle weakness caused by neurological disorders from other
conditions.
The EMG provides a depiction of the timing and pattern of muscle activity
during complex movements.
The raw surface EMG signal reflects the electrical activity of the muscle fibers
active at that time. Motor units fire asynchronously, and it is sometimes
possible, with exceedingly weak contractions, to detect the contributions of
individual motor units to the EMG signal. As the strength of the muscular
contraction increases, however, the density of action potentials increases and
the raw signal at any time may represent the electrical activity of perhaps
thousands of individual fibers.
You learned the possible movements at different joints before in other
courses like anatomy and physiology. In this lab we will review these
movements by applying them to different yoga postures in addition to
identifying which anatomical plane these motions occur along.
FOR MORE EXAMS
EMAIL:
EMAIL:
KINS 2203 EMG Laboratory-
Updated Fall 2025 latest updated
version with 100% accurate
solutions
KIN3202-Biomechanics of Physical Activity
Yoga Posture Laboratory 1
Electromyography Laboratory
Introduction:
Skeletal muscles do the majority of the work for locomotion and support of
the skeleton. Each muscle is made up of individual muscle fibers organized
in fascicles (Figure 1).
Figure 1. Skeletal muscle structure.
Each individual fiber is innervated by a branch of a motor axon. Under
normal circumstances, a neuronal action potential activates all of the
muscle fibers innervated by the motor neuron and its axonal branches. The
motor neuron, together with all of the individual muscle fibers that it
innervates, is termed a motor unit (Figure 2).
This activation process involves the initiation of an action potential (either
voluntarily, or as a result of electrical stimulation of a peripheral nerve),
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EMAIL:
, FOR MORE EXAMS
EMAIL:
conduction of the action potential along the nerve fiber, release of
neurotransmitter at the neuromuscular junction and depolarization of the
muscle membrane with resultant contraction of the muscle fibers.
Figure 2. The components of a motor unit.
Electromyography is a technique that measures the electrical activity of the
muscles and the nerves controlling the muscles. The data recorded is an
electromyogram (also known as an ‘EMG’ or
‘myogram’). There are two methods of recording: needle electrodes inserted
through the skin into the muscle or electrodes placed on the skin surface.
The size and shape of the waveform measured provide information about
the ability of the muscle to respond when the nerves are stimulated. In the
clinical setting, EMG is most often used when people have symptoms of
weakness, and examination shows impaired muscle strength. It can help to
differentiate muscle weakness caused by neurological disorders from other
conditions.
The EMG provides a depiction of the timing and pattern of muscle activity
during complex movements.
The raw surface EMG signal reflects the electrical activity of the muscle fibers
active at that time. Motor units fire asynchronously, and it is sometimes
possible, with exceedingly weak contractions, to detect the contributions of
individual motor units to the EMG signal. As the strength of the muscular
contraction increases, however, the density of action potentials increases and
the raw signal at any time may represent the electrical activity of perhaps
thousands of individual fibers.
You learned the possible movements at different joints before in other
courses like anatomy and physiology. In this lab we will review these
movements by applying them to different yoga postures in addition to
identifying which anatomical plane these motions occur along.
FOR MORE EXAMS
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