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Type of muscle contraction

Video vocabulary

let

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US / let /

UK / lɛt /

A1
  • verb
  • To allow someone to do something
  • Introducing a suggestion to do something together
  • To rent a house, etc. to others

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

also

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US / 'ɔ:lsəʊ /

UK / ˈɔlso /

A1
  • adverb
  • In addition; too; in a similar way

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

dynamometer

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US / ˌdaɪnəˈmɒmɪtə /

UK / ˌdaɪnəˈmɑmətər /

A1
  • noun
  • Measuring instrument designed to measure power

three

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US / θri: /

UK / θri /

A1
  • number
  • Number 3

body

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US / ˈbɒd.i /

UK / ˈbɑdi /

A1
  • noun
  • An object distinct from other objects
  • A group of people involved in an activity together
  • Main part of something
  • A person's physical self

opposite

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US / ˈɔpəzit /

UK / ˈɑpəzɪt /

A2
  • adjecitve
  • Being totally different from
  • noun
  • Person, thing that is totally different to another
  • preposition
  • Across from or on the side facing something

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

concentric

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US / kənˈsentrɪk /

UK / kənˈsɛntrɪk /

C1
  • adjecitve
  • Having a common center, e.g. some circles

rectus

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US / 'rektəs /

UK / 'rektəs /

A1
  • other
  • Any of various straight muscles

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

perform

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US / pə'fɔ:m /

UK / pɚˈfɔrm /

A1
  • verb
  • To carry out an action well or successfully
  • To entertain an audience by dancing, singing etc.

box

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US / bɒks /

UK / bɑ:ks /

A1
  • noun
  • A marked area of a baseball field
  • A container with four straight sides and a lid
  • Area of seating in a theater separated from others
  • A 4 sided container or shape printed on a page
  • Entire amount of something inside a container
  • verb
  • To strike someone on the side of the head
  • To pack an object in a six-sided container
  • To fight with gloved hands as a sport

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

good

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US / ɡʊd /

UK / ɡʊd /

A1
  • adjecitve
  • Proper, appropriate or right
  • (Of an amount) enough; plenty
  • Excellent; high quality
  • Acting well or properly; of moral character
  • In a positive or happy emotional state
  • noun
  • Advantage or benefit

weight

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US / weɪt /

UK / wet /

A2
  • noun
  • How heavy something is
  • Metal object to measure how heavy something is
  • Importance, power, and influence person, thing has
  • A source of worry, sadness, or emotional stress

prevent

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US / prɪ'vent /

UK / prɪˈvɛnt /

A2
  • verb
  • To stop something from happening or existing

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

sport

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US / spɔ:t /

UK / spɔː(r)t /

A1
  • noun
  • Something that is done for fun, e.g. football
  • Game or physical exercise with rules
  • Someone with a good attitude when things go badly
  • verb
  • To do something for fun, e.g. playing with animals
  • To wear, or show something off by wearing it

meaning

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US / ˈmi:nɪŋ /

UK / ˈminɪŋ /

A1
  • noun
  • Idea or thing represented by words or sentences
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular intention or value

position

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US / pəˈzɪʃn /

UK / pəˈzɪʃən /

A1
  • noun
  • Person's opinion or attitude about something
  • Specific location where someone or something is
  • Where you play or your role on a sports team
  • Person's job or status level
  • Set of conditions affecting what you can (not) do
  • verb
  • To put in a particular location or direction

characterize

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US / 'kærəktəraɪz /

UK / ˈkærəktəˌraɪz /

A2
  • verb
  • To describe the qualities of person, place, thing

contract

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US / 'kɒntrækt /

UK / 'kɑ:ntrækt /

A1
  • noun
  • Legal agreement, e.g. for doing work for money
  • Agreement to pay someone to kill a person
  • verb
  • To become ill as a result of getting a disease
  • To make an agreement for doing work for money
  • To reduce in size, length due to heat loss
  • To reduce the amount of

flexion

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US / ˈflekʃn /

UK / ˈflɛkʃən /

A1
  • noun
  • State of being flexed (as of a joint)deviation from a straight or normal courseact of bending a join

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

quadricep

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US / ˈkwɒdrɪsep /

UK / /

A1
  • noun

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

adduction

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US / ə'dʌkʃən /

UK / ə'dʌkʃən /

A1
  • noun
  • Moving a body part toward the center of the body

summary

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US / ˈsʌməri /

UK / ˈsʌməri /

B1
  • adjecitve
  • Brief, complete and accurate
  • noun
  • Shorter statement of the most important parts

contraction

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US / kənˈtrækʃn /

UK / kənˈtrækʃən /

B2
  • noun
  • Process of becoming smaller in length/size
  • Involuntary, often painful tightening of a muscle
  • Shortened form of words by omitting letters

exercise

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US / 'eksəsaɪz /

UK / ˈɛksɚˌsaɪz /

A2
  • noun
  • Physical activity to increase health and strength
  • Set of questions in a text book
  • verb
  • To work out to become stronger and healthier
  • To retain your ability or practice your skills

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

without

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US / wɪˈðaʊt /

UK / wɪðˈaʊt, wɪθ- /

A1
  • preposition
  • Not with; not having

muscle

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US / 'mʌsl /

UK / ˈmʌsəl /

A2
  • noun
  • Physical power
  • Body tissue that moves parts of the body
  • verb
  • To use or muscles of force to get what you want

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

trunk

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US / trʌŋk /

UK / trʌŋk /

B2
  • noun
  • Long nose of an elephant
  • Trunks shorts worn for swimming
  • Strong box/chest/container, as for traveling
  • Main thick and woody stem of a tree

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

fall

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US / fɔ:l /

UK / fɔl /

A1
  • noun
  • Season after summer and before winter; Autumn
  • A drop in amount; decrease
  • Dropping from a standing position to the ground
  • verb
  • To drop in amount; to decrease
  • To come down from a higher position suddenly
  • To go from standing to the ground, by accident

flex

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US / fleks /

UK / flɛks /

B2
  • verb
  • To move a part of the body to stretch muscles

isometric

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US / ˌaɪsəˈmetrɪk /

UK / ˌaɪsəˈmɛtrɪk /

A1
  • adjecitve
  • Related by an isometry; of or involving muscular contraction in which tension increases while length

plank

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US / plæŋk /

UK / plæŋk /

B2
  • noun
  • Long, thick board used when building something

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

stabilize

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US / 'steɪbəlaɪz /

UK / ˈstebəˌlaɪz /

B1
  • verb
  • To make stable/consistent, with no major changes

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

lengthen

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US / 'leŋθən /

UK / ˈlɛŋθən, ˈlɛŋk- /

B1
  • verb
  • To make or become longer in time or distance

statically

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US / ˈstætɪkəli /

UK / ˈstætɪk(ə)li /

B2
  • adverb
  • In an unchangeable or unmovable way

rare

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US / reə(r) /

UK / rɛr /

A2
  • adjecitve
  • (Of meat) cooked, but still red and juicy
  • Unusual or out of the ordinary; not common

two

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US / tu: /

UK / tu /

A1
  • number
  • 2

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

breaststroke

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US / 'breststrəʊk /

UK / ˈbrɛstˌstrok /

C2
  • noun
  • Swimming stroke when you push both arms forward

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

hold

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US / həʊld /

UK / hold /

A1
  • noun
  • Section of a ship or plane used for storing things
  • Influence or power held over someone
  • Place of support for hands or feet when climbing
  • verb
  • To agree to keep something for someone
  • To have the capacity to support/contain something
  • To control an area and protect it from attack
  • To not allow someone to leave a place
  • To cause an event to happen at a place or time
  • To use hands or arms to carry or keep something
  • To have a specific quality or property
  • To keep an image, belief or feeling in your mind
  • To have or own something
  • To wait before being able to talk on the phone
  • To limit the movement of someone in a sport

elbow

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US / 'elbəʊ /

UK / ˈɛlˌbo /

B2
  • noun
  • Middle part of the arm, which bends
  • verb
  • To push another person with the side of your arm

general

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US / 'dʒenrəl /

UK / ˈdʒɛnərəl /

A1
  • adjecitve
  • Widespread, normal or usual
  • noun
  • Top ranked officer in the army

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

swimming

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US / ˈswɪmɪŋ /

UK / ˈswɪmɪŋ /

A1
  • noun
  • The act of moving through water
  • verb
  • To move through water by moving parts of the body

activity

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US / æk'tɪvətɪ /

UK / ækˈtɪvɪti /

A1
  • noun
  • An action or task, e.g. sports, washing clothes

movement

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US / ˈmu:vmənt /

UK / ˈmuvmənt /

A2
  • noun
  • Part of a piece of classical music
  • Group with a shared interest or goal
  • Group sharing the same idea to change society, art
  • Action you do when exercising, e.g. in a gym
  • Part of a piece of music

length

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US / leŋθ /

UK / leŋθ /

A2
  • noun
  • Distance from one end of a pool to the other
  • Measurement of distance or of time

speed

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US / spi:d /

UK / spid /

A2
  • noun
  • How fast or slow something is or is done
  • verb
  • To move quickly when completing an action
  • To drive a vehicle faster than laws allow

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

extend

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US / ɪkˈstend /

UK / ɪkˈstɛnd /

A2
  • verb
  • To offer something (help, friendship) to someone
  • To reach from one point to another
  • To straighten or stretch something out, e.g. leg
  • To make something last longer

lower

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US / 'ləʊə(r) /

UK / ˈlaʊɚ, laʊr /

A2
  • adjecitve
  • In a position more near the bottom
  • verb
  • To move something downward to the ground

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

constant

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US / 'kɒnstənt /

UK / ˈkɑnstənt /

A2
  • adjecitve
  • Happening frequently or without pause
  • noun
  • Thing that happens always or at a regular rate

eccentric

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US / ɪkˈsentrɪk /

UK / ɪkˈsɛntrɪk, ɛk- /

B1
  • adjecitve
  • Out of the ordinary; acting unusually or oddly
  • noun
  • Person who acts unusually or bizarrely

system

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US / 'sɪstəm /

UK / ˈsɪstəm /

A1
  • adjecitve
  • Working in an organized, logical way
  • noun
  • Set of organized, planned ideas that work together

under

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US / ˈʌndə(r) /

UK / ˈʌndɚ /

A1
  • adjecitve
  • In the same place as another thing, but lower
  • adverb
  • In a lower quantity or price than expected
  • preposition
  • According to the terms of an agreement or law
  • Managed or controlled by the authority of
  • Being of a lesser quality or amount than expected
  • Influenced or affected by something or someone
  • Less or lower in age, amount, size or number

load

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US / ləʊd /

UK / lod /

A2
  • noun
  • Large, often heavy, amount of a thing to be moved
  • A burden; heavy responsibility
  • Many or much of something; a lot of
  • Items that fill a truck, machine
  • verb
  • To put in items for use (e.g. bullets in a gun)

talk

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US / tɔ:k /

UK / tɔk /

A1
  • noun
  • Style of speaking
  • Discussion between two countries
  • Giving information in front of people; lecture
  • Saying things or ideas to someone with words
  • verb
  • To make a formal speech about something
  • To say things or ideas to someone with words

difference

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US / 'dɪfrəns /

UK / ˈdɪfərəns, ˈdɪfrəns /

A1
  • noun
  • A thing or issue that people do not agree about
  • Not of the same kind; unlike other things

occur

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US / əˈkɜ:(r) /

UK / əˈkɚ /

A2
  • verb
  • To come to pass or to happen

shorten

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US / 'ʃɔ:tn /

UK / ˈʃɔrtn /

A2
  • verb
  • To make something, e.g. a skirt, shorter

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

second

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US / 'sekənd /

UK / ˈsɛkənd /

A1
  • adjecitve
  • 2nd; the one following first
  • noun
  • Unit of time; one sixtieth of a minute
  • Short period of time that you wait for someone
  • (Do) soon
  • verb
  • To agree to support a proposal at a meeting

during

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US / ˈdjʊərɪŋ /

UK / ˈdʊrɪŋ, ˈdjʊr- /

A1
  • preposition
  • At some point in the course of an event or thing

include

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US / ɪnˈklu:d /

UK / ɪnˈklud /

A1
  • verb
  • To make someone, something part of a group

step

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US / step /

UK / stɛp /

A1
  • noun
  • Movement done as part of a particular dance
  • Distance covered by one movement of a leg; stride
  • One part or stage in a process
  • Sound made by the feet while walking; footstep
  • Flat horizontal piece that forms stairs
  • verb
  • To raise and moving the foot to put it down

phase

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US / feɪz /

UK / fez /

A2
  • noun
  • Different stages of the moon from new to full
  • Distinct part or step in a process
  • One stage of a process or series of stages
  • verb
  • To make happen in a gradual ordered way

curl

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US / kɜ:l /

UK / kɚrl /

B2
  • noun
  • Something that has the shape of a curve or ring
  • verb
  • To form something into a round or curved shape
  • To become curved around the edges

resistance

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US / rɪ'zɪstəns /

UK / rɪˈzɪstəns /

A2
  • noun
  • Force that stops or slows movement of something
  • Refusal to accept something new or different

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

restrain

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US / rɪ'streɪn /

UK / rɪˈstren /

B1
  • verb
  • To limit, restrict, or keep under control

type

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US / taɪp /

UK / taɪp /

A1
  • noun
  • Printed letters or blocks used for printing them
  • Group of things or people sharing common features
  • verb
  • To identify something belonging to a group
  • To write by touching keys on a keyboard

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

lastly

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US / ˈlɑ:stli /

UK / ˈlæstli /

A2
  • adverb
  • In conclusion; at the final part of something

shortening

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US / ˈʃɔ:tnɪŋ /

UK / ˈʃɔrtnɪŋ, ˈʃɔrtnɪŋ /

B1
  • verb
  • To make something, e.g. a skirt, shorter

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

again

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US / ə'ɡen /

UK / əˈɡɛn /

A1
  • adverb
  • One more time, once more

bicep

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US / baɪ'sep /

UK / baɪ'sep /

C2
  • noun
  • Muscle of the front upper arm

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’
  • Subtitles section
  • Types of Muscle Contraction
  • There are three general types of muscle contraction that help us produce different movements.
  • Isotonic muscle contractions,
  • Isometric muscle contractions, and isokinetic muscle contractions.
  • Let's start with isotonic muscle contraction.
  • Isotonic muscle contraction is the best known type of contraction.
  • It is characterized by a change in muscle length during contraction without a change in load or resistance.
  • There are two types of isotonic muscle contractions, concentric contraction and eccentric contraction.
  • Concentric contraction, this is characterized by muscle shortening under load.
  • For example, when you perform a bicep curl during the flexion phase, your biceps contract and shorten under the load.
  • Eccentric contraction, this is the opposite of isotonic muscle contraction, meaning the muscle is lengthened under load.
  • In the same example, eccentric contraction will occur when you lower, extend your elbow during the bicep curl, and the biceps will lengthen under load.
  • We can see another example of these two contraction types in the quadriceps muscle when performing the box step-up.
  • When stepping up on the box, the quadriceps shorten under load, meaning concentric contraction.
  • When stepping back to the starting position, the quadriceps lengthen under load, eccentric contraction, which also helps to restrain the body weight and prevent falling.
  • The second type of muscle contraction is isometric muscle contraction.
  • Unlike isotonic muscle contraction, in isometric muscle contraction, there is no change in muscle length during contraction.
  • For example, in the plank exercise, the rectus abdominis stabilizes the trunk without a change in its length.
  • If we look at the bicep curl again, isometric contraction means you would stop during the movement and statically hold the weight without flexing or extending your elbow.
  • And lastly, we have isokinetic muscle contraction.
  • Isokinetic contractions are like isotonic in that the muscle changes in length during the contraction.
  • The difference between isotonic contractions and these contractions is that the isokinetic contractions produce movements of a constant speed.
  • Examples of using isokinetic contractions in daily activity and sports are rare.
  • However, the best example of this type of contraction is the breaststroke when swimming, where the water provides a constant, even resistance to the adduction movement.
  • To produce this type of contraction, you would need to be using an isokinetic dynamometer system.
  • In summary, we talked about three types of muscle contraction, isotonic, isometric, and isokinetic.
  • Isotonic contraction includes concentric contraction, where the muscle is shortened under load,
  • And eccentric contraction, where the muscle is lengthened under load, isometric contraction, when the muscle doesn't change in length under load, and isokinetic contraction, when the muscle changes in length during contraction and produces movements of a constant speed.