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All WACE Physical Education terms 3AB Flashcards

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388585831PreparationThe first stage of the 5-step analysis framework, where the coach or biomechanist identifies the skill, and aspect of the skill, to be analysed.1
388585832ObservationThe second stage of the 5-step analysis framework. The coach/biomechanist decides how many observations, from how many vantage points, in which sort of situations (lab vs field, training vs gameplay, energised vs fatigued), the athlete will be examined in.2
388585833EvaluationThe third stage of the 5-step analysis framework, where the coach/biomechanist compares the ideal performance with the athlete's performance, decides on weaknesses in the athlete's performance, and allocates extra resources to correct the weaknesses.3
388585834InterventionThe fourth stage of the 5-step analysis framework. The athlete 's performance should be corrected using the appropriate techniques, and more feedback on the performance should be given.4
388585835Re-observationThe fifth stage of the 5-step analysis framework, where the athlete is observed again to see if the corrections have been made to the performance.5
388585836Newton's First LawEvery object stays at rest or in uniform motion unless acted upon by an unbalanced force.6
388585837Newton's Second LawAn object that has an unbalanced force acting on it will accelerate in the direction of the force.7
388585838Newton's Third LawEvery action has an equal and opposite reaction.8
388585839Linear momentumMass × velocity (m.v).9
388585840ForceMass × acceleration (F = m.a)10
388585841ImpulseForce × time = the change in momentum, F.t = m(v-u)11
388585842Coefficient of restitutionThe 'bounciness' of a collision. It ranges between 1 (perfectly elastic, perfect linear momentum conservation) and 0 (totally inelastic, no linear momentum conservation). Nothing has a 1 value, as energy is always lost in a collision (by sound, heat, light, etc). Is effected by materials of objects colliding, velocity of the collision, and the temperature of the objects.12
388585843Moment of inertiaA measure of the resistance of an object to changes in the object's rotational motion about the axis. Also known as rotational inertia. I = Σ(mr*2)13
388585844Angular momentumThe angular equivalent of linear momentum. L = I (inertia).ω (angular velocity)14
388585845First class leverLoad ↓ - fulcrum/axis - force ↓ (hint: see-saws, a diving board, holding up the head).15
388585846Second class leverForce ↑ - load ↓ - fulcrum/axis (hint: wheelbarrows, ).16
388585847Third class leverLoad ↓ - Force ↑ - fulcrum/axis (hint: using a cricket bat, biceps in a bicep curl).17
388585848Force armThe distance between the fulcrum/axis and the force.18
388585849Resistance armThe distance between the fulcrum/axis and the load.19
388585850TorqueA force that causes rotation, an eccentric force. Increased by the position of the force being further out, and by a larger amount of force.20
388585851Magnus effectThe change in the flight path of a projectile - where an object is 'pulled' in a certain direction when spin is put on it, because different pressures exist at opposite sides of the object. A ball will spin in the direction of the high velocity, low pressure side.21
388585852Bernoulli PrincipleAn increase in the speed of fluid occurs simultaneously with a decrease in pressure. A ball will spin in the direction of the high velocity, low pressure side.22
388585853Form dragResistance created by a pressure differential between the front and rear sides of a body moving through a fluid, and is mostly influenced by the shape of the front of the body.23
388585854Frictional dragDrag created by the surface area of a body in water.24
388585855Wave dragResistance created by wave generation - only on the water's surface.25
388585856Angular motionThe motion of an object around a central point, rotation. ω = θ / t26
388585857General motionA combination of linear and angular motion.27
388585858Linear motionMovement in a straight line.28
388585859VelocityV = displacement / time (m/s)29
388585860AccelerationΔv / t (m/s*2)30
388585861Quantitative analysisAnalysis shown with numbers and figures, ie the speed of a ball, or running speed. Also known as objective analysis.31
388585862Qualitative analysisAnalysis of the technique, through video footage, opinion, etc, designed to improve technique. Also known as subjective analysis.32
388585863Isometric contractionA muscle contraction in which no movement occurs because of an equal force in the opposite direction; the length of the muscle remains constant under tension.33
388585864Concentric contractionA dynamic muscle contraction where the muscle applies enough force to overcome the resistance and the muscle shortens as it contracts.34
388585865Eccentric contractionA contraction that involves the muscle lengthening while producing tension.35
388585866VectorsArrows used to represent direction and magnitude of a force on a body.36
388585867Contact forcesGround reaction force, joint reaction force (between bones), friction, fluid resistance (lift and drag), muscle force and elastic force are all _______ ______.37
388585868Free body diagramA vector diagram showing all the forces acting on a body.38
388585869Centre of gravityThe centre of a body, that all the particles are distributed around evenly39
388585870StabilityDepends on where the line of gravity is in relation to the base of support. Can be increased by increasing the base of support, lowering the centre of gravity, and increasing the mass of the body. There are three states of equilibrium - stable, unstable, and neutral40
388585871Segmental interactionMovement in sequences, where energy is transferred across the body segments and joints in turn. Moving each segment involved in an action in turn, called sequential movement, starting with the larger and slower limb, and finishing with the faster, more specialised muscles, creates greater amount of momentum and can generate more speed and force.41
388585872Performance routineActions and/or thoughts that an athlete uses before their performance as a cue.42
388585873Inverted U hypothesisExplains the relationship between arousal states and performance. Arousal at both the high and low end occurs in poor performance.43
388585874ArousalA state of heightened physiological activity.44
388585875StressAn imbalance between demand and response, where not meeting the demand has significant consequences.45
388585876Environmental demandThe first stage of the stress process.46
388585877Perception of demandThe second stage of the stress process, and is subjective to the individual.47
388585878Stress responseThe third stage of the stress process. Cognitive (worry and apprehension) or somatic (heart rate, shallow breathing, muscle tension) state anxiety can occur and can tire and narrow the attention of an athlete.48
388585879Behavioural consequencesThe fourth stage of the stress process. Performance can be improved or impaired, an impaired performance may increase the environmental demand.49
388585880MotivationThe direction and intensity of an individual's effort.50
388585881ConcentrationThe ability to focus on relevant cues in the environment.51
388585882ConfidenceAssurance in one's self, company, or situation.52
388585883ImageryImagining feelings and senses to replicate those from the competition.53
388585884Progressive relaxationStress-management strategy in which muscles are alternately tensed & relaxed.54
388585885Breathing controlPractising deep breathing to relax the individual.55
388585886Thought stoppingA technique used to alter the process of negative or self-critical thought patterns56
388585887Self talkUsually internal self dialogue.57
388585888Goal settingSpecific Measurable Action-oriented Realistic Time-bound Self-determined58
388585889Group cohesionThe degree to which groups stick together and members feel committed to one another and attracted to the group and its goals.59
388585890Task cohesionCohesion related to a particular task.60
388585891Social cohesionCohesion due to a friendship bond.61
388585892SociogramA diagram that plot the social structure of a group, and identifies leaders and isolated members.62
388585893Carron's Model of Group CohesionThe accepted model of factors effecting group cohesion.63
388585894Environmental factorsContractual responsibilities and team organisation are e____________ f______.64
388585895Personal factorsTask motivation, affiliation motivation, satisfaction, and social loafing are p_______ f______.65
388585896Leadership factorsThe coach/captain, their leadership style, and their athlete/team relationships are l_________ f______.66
388585897Team factorsTeam stability, team success, and desire for team success, are t___ f______.67
388585898Social loafingThe phenomenon that occurs when individual performances decreases as the number of people in a group increases, due to increased lack of coordination or increased lack of motivation.68
388585899Matching hypothesisA theory that cognitive techniques should be used to cope with cognitive anxiety symptoms, and somatic techniques should be used to cope with somatic anxiety symptoms.69
388585900ChokingThe feeling of being so intensely motivated that it is detrimental to performance. Relaxation techniques can help prevent motivation from reaching this level.70
388585901Transfer of learningThe effects of learning one skill on the subsequent performance of another related skill.71
388585902Positive transferWhere a previously learnt skill or context assists with a new skill or context.72
388585903Negative transferWhere a previously learnt skill inhibits the learning or execution of a new skill, or a new context.73
388585904Augmented feedbackFeedback from an external source, like a coach, biomechanist, etc, and can be given via visual, verbal, kinaesthetic or written means.74
388585905Autocratic leaderA dictator - a leader who makes all the decisions about a team, which can sometimes include their personal decisions.75
388585906ChainingWhere a skill is broken down into separate components, and practised separately but in order (forwards or backwards), so they can be put together to create the whole skill.76
388585907ChecklistA clear, predetermined criteria relating to a performance or a skill, that can act as expectations for a performance, or can be used as a record of an athlete's performance over time.77
388585908Complex skillA skill that has several components to it, or requires a lot of attention to execute.78
388585909Democratic leaderA leader who works with their team to come up with decisions that effect the team.79
388585910Descriptive augmented feedbackAugmented feedback that identifies errors in a performance.80
388585911Dynamic drillA drill that contains the components of a skill, performed while moving.81
388585912Laissez-faire leaderA leader that lets their team make their own decisions. The term used is French for "let it be".82
388585913Notational analysisA record of a team's performance consisting of numbers and facts, which generally gives a more accurate, less biased view of the performance of each player and the team as a whole.83
388585914Feedback sandwichA way of giving feedback to an individual, where positive feedback is given, followed by the correction, followed by another positive point.84
388585915Prescriptive augmented feedbackFeedback given that identifies errors and suggests corrections for them. Visual cues can be given to show corrections, including demonstrations, visual aids, or enhancement of the visual environment85
388585916Proactive transferWhere skills learnt previously effect the new skill being learnt or performed.86
388585917Proprioceptive feedbackInternal feedback, including sensory information from joints, muscles, skin, etc, which lets us know where we are in relation to space.87
388585918Reflective learning processThe individual learning the skill uses augmented and intrinsic feedback to reflect on their performance to understand and improve it.88
388585919Retroactive transferWhere a new skill influences the performance of a previously learnt skill.89
388585920ShapingLearning a skill by practising the whole skill in a basic form, then building on this basic form with the more complex aspects of the skill. The order the skill components are practised in isn't important, and are usually over-emphasised.90
388585921Simple skillA skill with only a few components, that doesn't require much thought to execute.91
388585922Skill-to-skill transferThe type of transfer where a skill or an experience has an influence on another skill, either in a different context, or because of the differences in the two skills.92
388585923Static drillA drill that contains the components of a skill, performed on the spot.93
388585924Theory-to-practice transferTransferring a skill taught verbally, or with visual, kinaesthetic or written aids, to practice.94
388585925Verbal cueA phrase or word that cues the individual's attention to a specific part of their performance or the environment.95
388585926Zero transfer of learningWhere no transfer of learning occurs between two skills, because they are so dissimilar.96
388585927Training-to-competition transferTransferring a skill to competition, using drills in training that imitate the context and pressure of competition.97
388585928Motion analysis modelPreparation Observation Evaluation Intervention Re-evaluation98
388585929Guidance hypothesisIf augmented feedback is provided too often to an individual skill, the individual won't properly develop intrinsic feedback relating to that new skill. An individual must have intrinsic feedback in competition, where a coach can't give feedback on each skill.99
388585930Amino acidThe smallest unit of a protein.100
388585931Carbohydrate loadingThe extra consumption of complex carbohydrates in the days prior to endurance exercise.101
388585932Simple sugarsSmall sugar molecules found in sweet foods like honey and juice.102
388585933Complex carbohydratesLonger molecule carbohydrates that are derived from plants, like bread, pasta, rice, cereals and potatoes.103
388585934GlucoseThe simplest molecule of energy.104
388585935Glycaemic indexA scale from 0-100 that rates the effect of certain foods on blood glucose levels. Those rated at 70 and above are considered high, from 55 to 69 are considered medium GI and under 55 are considered low GI.105
388585936GlycogenThe form that glucose is stored as in the body. It is made of long chains of glucose, which form in the liver/skeletal muscle cell and become stuck in there because of the impermeability of the membrane to the length of the molecule. 600-800g of this can be stored at once, when carbohydrate loading.106
388585937Saturated free fatty acidsOne of the most basic levels of fat. This unhealthy type is found in dairy products and meats.107
388585938Unsaturated free fatty acidsOne of the most basic levels of fat. This healthy type are found in avocado, fish, nuts and olive oil.108
388585939TriglycerideOccurs naturally in animal and vegetable tissue. It consists of three individual fatty acids bound together in a single large molecule, and is an important energy source forming much of the fat stored by the body.109
388585940ProteinMolecules that make up the body, and are made of chains up to 100+ amino acids long. They're found in eggs, meat and fish. The average individual should have a diet made up of 15% protein, but strength athletes will have a diet of up to 30% protein to repair muscles after hypertrophy work. Proteins are rarely broken down for energy.110
388585941Pre-competition mealThe main purpose of this is to fill the fuel stores of the body with carbohydrates and low fat intake. This is so that the body has these stores throughout the duration of the activity. The meal should be consumed three-four hours prior to competition. Some athletes prefer this meal in liquid form for easy digestion.111
388585942Pre-competition snackThese are consumed 30-40 minutes prior to competition, and the purpose is to 'top-up' the carbohydrate stores. Food consumed at this time should be low in GI, so that rebound hypoglycaemia doesn't occur.112
388585943Pre-competition fluid intakeAround 300-500mL of water should be drunk around four hours before competition, to allow it to absorb and urine to be passed. The colour of the urine should determine whether the athlete has drunk enough. If the urine is too dark, around 200-300mL more water should be drunk.113
388585944RadiationHeat transfer via electromagnetic waves.114
388585945ConductionHeat transfer via direct contact with another object.115
388585946ConvectionHeat transfer via a constantly moving fluid, like air or water.116
388585947EvaporationHeat transfer from a liquid turning into a gas. This is the only heat loss mechanism that can be used in high temperatures, as other mechanisms make the body gain heat from the environment.117
388585948Double heat loadWhen exercising, sweat is excreted from the body to lose heat. This sweat comes from plasma in the blood. The blood becomes thicker, and can't get to the capillaries in the periphery, and is instead prioritised to the working muscles. This means that less heat can be lost.118
388585949Cardiac driftThe reduced plasma volume due to sweating decreases the stroke volume. In order to keep up the cardiac output, the heart rate must increase.119
388585950Heat exhaustionA condition marked by dizziness and nausea and weakness caused by depletion of body fluids and electrolytes.120
388585951Heat strokeA life-threatening condition where the body can no longer regulate heat, and the core temperature can keep rising to fatal temperatures.121
388585952HyperhydratedBeing excessively hydrated. Useful before activities in the heat to keep the level of sweating up for longer and hold off double heat load.122
388585953Pre-coolingTechniques like ice jackets, ingesting ice and cold water immersion are important for cooling the body before exercising in the heat.123
388585954Heat acclimatisationSpending time training in the heat to decrease the time it takes to start sweating, and increase the rate of sweat and plasma volume. This can be done by training in a hotter climate, in a climate chamber, or in a hotter part of the day.124
388585955VasoconstrictionConstriction of blood vessels to reduce blood flow to the periphery125
388585956VasodilationWidening of the blood vessels that allows for increased blood flow.126
388585957ShiveringRapid contraction of muscles, requiring energy and therefore creating heat, to warm the body.127
388585958PiloerectionCausing hair to stand on end by the contractions of little muscles at the base of the hair, thereby trapping an insulation layer of air near the body.128
388585959PilorelaxationThe relaxing of the little muscles under the skin that cause hairs to stand on end, that result in the hair laying down and allowing convection currents to increase heat loss.129
388585960Wind-chillA measure of cooling combining temperature and wind speed.130
388585961HypoxiaA lack of oxygen. Immediate adaptations to hypoxia include hyperventilation, decreased plasma volume (to increase haemoglobin concentration), and increased heart rate. Long term adaptations included an increased red blood cell count, increased haemoglobin, capillarisation, mitochondria and aerobic enzymes.131
388585962Live high train lowThe statement applied to most altitude training, where athletes rest at altitude and train at sea level, as training at altitude is likely to cause detraining.132
388585963Performance enhancersTechniques or drugs that improve performance.133
388585964TaperThe reduction in training load before a competition, to allow extra recovery time. This may mean the intensity of training is increased, but there is always a reduction in the time the athlete trains for. Usually accompanied by carbohydrate loading.134
388585965Protein supplementUsually in the form of powders, they contain extra amino acids to help repair muscle and therefore build muscle bulk. Mostly used by athletes in strength events.135
388585966CreatineFound both as a free molecule and combined with phosphate. Excess amounts mean that the body can produce more energy to use in the production of ATP, and so decrease the recovery time for an athlete after a sprint, or between repeated sprints. Can cause fluid retention, however, which can be a disadvantage. The long term effects haven't been researched.136
388585967CaffeineA drug found in many drinks and foods, most commonly found in coffee, tea, chocolate, energy drinks and soft drinks. It is a stimulant, so can increase reaction time and concentration, and reduce feelings of fatigue or effort. It is also a diuretic. It can cause restlessness, muscle twitching, irritability, and increased heart rate and blood pressure. It increases the availability of free fatty acids for energy, and encourages the burning of body fat.137
388585968Buffering agentsThe body has natural buffers, however, consuming sodium bicarbonate or sodium citrate is supposed to increase the buffering capacity (the ability to stabilise a pH even when excess acids or bases are added to it) of the muscle, to reduce the acidity caused by hydrogen ions. Too much can cause abdominal cramps and diarrhoea. No research on the effects of regular use have been done.138
388585969Anabolic steroidsThese supplements act as extra testosterone, and increases muscle mass. This is important after training to repair damage to muscles. A decreased recovery time means an athlete can train for longer. In men, they cause an impaired production of testosterone when not using steroids, infertility, acne, aggression, and decreased testicular volume, and in women, it causes a deepening voice, the growth of facial hair, and menstrual irregularities. It can also increase the risk of heart disease and liver dysfunction in both sexes.139
388585970Blood dopingInjecting previously stored red blood cells before an athletic event to have more cells available to deliver oxygen to tissues. 0.5-1L of blood is taken and spun to separate the plasma from the red blood cells. The plasma is put back into the bloodstream, and the blood cells are stored. The red blood cells are put back in before competition, after the body has already produced more cells to make up for the loss. There is a huge increase in oxygen carrying capacity. It can only be tested by testing the amount of haematocrit in the bloodstream. However, it can be dangerous because it increases blood viscosity, and increases the chance of blood clotting, heart attack, and stroke.140
388585971ErythropoietinA hormone produced and released by the kidney that stimulates the production of red blood cells by the bone marrow, which, if injected, has the same effect as blood doping. The use of erythropoietin can only be tested by testing the amount of haematocrit in the bloodstream. It can be dangerous because it increases blood viscosity, and increases the chance of blood clotting, heart attack, and stroke.141
388585972General preparatory phaseTo establish a base level of fitness and skills. For this reason athletes will do a large amount of moderate intensity physical activities.142
388585973Specific preparatory phaseThe training becomes more specific to the sport that the athlete is involved in. There is still a large emphasis on the development of basic skills and endurance, but they are done at a higher intensity.143
388585974Pre-competition phaseThe aim of this phase is to approach peak condition. The training involves highly specific training where there is much emphasis on intensity rather that volume. The coach may try to introduce a competitive sense by adding in scratch matches. More time is allowed for recovery.144
388585975Competition phaseAll physical and technical capacities have been reached by this time. Therefore the endurance work is maintain fitness rather than overloading. Training sessions should involve the psychological and tactical components of the game.145
388585976Transition phaseAlso called the off-season, the athletes relax and work to maintain fitness, and sometimes deal with injuries.146
388585977MacrocycleA period of approximately 4-6 weeks with a particular goal to be be achieved by the end of the period.147
388585978MicrocycleA period of approximately a week long, with a particular goal in mind to be achieved at the end of the period. The work done in the period should contribute to achieving the macrocycle.148
388585979Cardiorespiratory enduranceThe ability of the heart and lungs to send fuel and oxygen to the body's tissues during long periods of vigorous activity.149
388585980Muscular strengthThe maximum force that can be exerted in a single effort.150
388585981Muscular enduranceThe ability of the muscles to perform physical tasks over a period of time without becoming fatigued.151
388585982FlexibilityThe range of motion about a joint.152
388585983Body compositionThe proportion of fat and muscle in the body.153
388585984AgilityA skill/performance-related component of fitness - the ability to rapidly change direction154
388585985BalanceA skill/performance-related component of fitness - the ability to maintain stability whilst in motion.155
388585986CoordinationA skill/performance-related component of fitness - the ability to integrate the senses and movement of body parts to perform tasks efficiently.156
388585987Reaction timeA skill/performance-related component of fitness - the time taken from when a stimulus is presented to when the appropriate reaction is taken in response.157
388585988SpeedA skill/performance-related component of fitness - the ability to perform a movement quickly.158
388585989PowerA skill/performance-related component of fitness - the ability to perform a strong movement quickly.159
388585990ATP-CP systemAn anaerobic energy system in the body. It supplies energy faster than the other systems. It needs CP to fuel it, and lasts around 8 seconds.160
388585991Lactic acid systemAn anaerobic energy system in the body. It is the second fastest system in the body. It is fuelled by carbohydrates and can last about 30-60 seconds161
388585992Aerobic systemThe slowest energy production system in the body. It is fueled by carbohydrates, or fats and proteins, and requires oxygen, it can last from 1.5-3 hours, as long as there is enough glucose, fluids, and oxygen in the body.162
388585993PeakingThe phase of training in which performance is optimised to meet the demands of a race, competition or series.163
388585994Massagekneading and rubbing parts of the body to increase circulation for the removal of waste products and to reduce muscle soreness and swelling.164
388585995Compression garmentsVery tight clothing, designed to enhance the venous muscular pump to reduce muscle soreness. There is limited evidence for this method of recovery.165
388585996Cold water immersion10-20 minutes of soaking in water below 15°C to reduce blood flow and therefore inflammation, muscle spasming and pain.166
388585997Warm water immersion10-20 minutes soaking in water above 37°C to increase blood flow.167
388585998Contrast water therapySwitching between hot and cold water immersion to create a 'pump' to reduce swelling and inflammation.168
388585999StretchingUsed as a warm up and after a performance - moving the joints beyong the accustomed range of motion. There is limited evidence to support it as a recovery technique.169
388586000Hyperbaric oxygen chamberA chamber full of extra oxygen, which speeds the repair of muscles and reducing inflammation.170
388586001OvertrainingExercising too intensely or for too long without allowing enough time for rest. Symptoms include increased resting heart rate, impaired physical performance, reduced enthusiasm and desire for training, increased incidence of injuries and illness, altered appetite, disturbed sleep patterns and irritability. Can be prevented with 24-48 hours of rest between intense exercise, and the correct nutrition and a good amount of rest.171
388586002PeriodisationOrganised division of training into a number of specific blocks, periods or phases that will help the athlete reach their peak performance at a certain time.172
388586003Central nervous systemThe part of the nervous system consisting of the brain and spinal cord.173
388586004Peripheral nervous systemThe section of the nervous system lying outside the brain and spinal cord.174
388586005AxonsLong extensions of the cytoplasm that send an impulse away from the cell body.175
388586006DendritesShort, finger-like, extensions that take messages to the cell body.176
388586007Myelinated fibresNeurons wrapped with Schwann cells to increase conduction velocity, up to 140m/s from 2m/s, using saltatory conduction (forcing the action potential to 'jump' between Nodes of Ranvier)177
388586008NeurilemmaThe outside layer of Schwann cells, that repairs damage to the myelin fibre.178
388586009Skeletal muscleVoluntary, striated muscle that moves bones, works in pairs and is attatched to bones by tendons.179
388586010TendonsTough connective tissue that joins skeletal muscles to bones.180
388586011Muscle bellyFleshy central portion of muscle.181
388586012EpimysiumConnective tissue layer surrounding the entire muscle belly.182
388586013FascicleBundle of individual muscle fibres.183
388586014PerimysiumConnective tissue surrounding a fascicle.184
388586015Muscle fibreA muscle cell. It has several nuclei.185
388586016EndomysiumConnective tissue surrounding a muscle fibre.186
388586017SarcolemmaThe cell membrane of a muscle cell.187
388586018MyofibrilA series of sarcomeres; several are contained within one muscle fibre.188
388586019MyofilamentAligning filaments found in myofibrils that contain the proteins that contract.189
388586020SarcomereThe smallest functional unit of muscle tissue - the segments into which a myofibril is divided.190
388586021ActinThe thin filament in the sarcomere.191
388586022MyosinThe thick filament in the sarcomere.192
388586023OriginThe immoveable end of a muscle.193
388586024InsertionThe end that moves when the muscle contracts.194
388586025Z-lineThe edges of the sarcomere.195
388586026H-zoneThe space between the actin myofilaments.196
388586027I-bandThe space between the myosin filaments. These are seen as light striations.197
388586028A-bandThe length of the myosin filament. These are seen as dark striations.198
388586029Sliding filament theoryTheory that actin filaments are pulled toward each other by myosin filaments during muscle contraction.199
388586030CrossbridgesExtensions of myosin filaments that attach to actin and pull actin filaments together during muscle contraction.200
388586031Force-velocity relationshipContractions held for longer generate more force as it allows the sarcomere more time to contract. It also works in reverse - if trying to move a lighter object, less force has to be generated, so the action can occur faster.201
388586032Force-length relationshipA contraction in the middle of a joints range of motion generates the most force.202
388586033Neural chainA kind of neural circuit in which neurons are attached linearly, end-to-end.203
388586034Motor unitA motor neuron and all the all the skeletal muscle cells it innervates. Large ones are typically found in large muscles, and produce gross movements. Small ones are found in smaller muscles, and produce more precise movements.204
388586035All-or-nothing principleThe principle that once the electrical impulse reaches a certain threshold, must begin an impulse, which moves all the way down the axon. Every impulse has the same intensity.205
388586036Strength trainingThis type of training causes improved technique, increased firing rate of motor units, more motor units are recruited, and the firing pattern of the motor units are better coordinated, all before the development of extra muscle bulk!206
388586037Type 1 fibreA type of muscle twitch fibre, this one is the slowest to contract. It better uses the aerobic system, so is better suited for endurance events. They are small and red.207
388586038Type 2a fibreA type of muscle twitch fibre, this one is not the slowest or the fastest to contract. It better uses the anaerobic system, so is better suited for middle-distance events. They are large and white.208
388586039Type 2b fibreA type of muscle twitch fibre, this one is the fastest to contract. It better uses the anaerobic system, so is better suited for sprinting events. They are large and white.209

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