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  • Slide 1
  • CSEP - CPT M-S Theory2006 Version 2.01 CSEP-Certified Personal Trainer (CSEP-CPT) Musculoskeletal Fitness Theory
  • Slide 2
  • CSEP - CPT M-S Theory2006 Version 2.02 Basic Anatomy Key Concepts: 3.23-3.25
  • Slide 3
  • CSEP - CPT M-S Theory2006 Version 2.03 Force & Levers 1 st class seesaw muscles that extend neck 2 nd class loaded wheelbarrow plantar flexion force at the expense of speed & distance 3 rd class flexion at elbow speed & distance at the expense of force R F AF R F R F
  • Slide 4
  • CSEP - CPT M-S Theory2006 Version 2.04 Fascicle Organization
  • Slide 5
  • CSEP - CPT M-S Theory2006 Version 2.05 Parallel Muscles Fascicles are parallel to long axis Most muscles in body Functional characteristics similar to individual m. fibre Entire m. shortens by same amount
  • Slide 6
  • CSEP - CPT M-S Theory2006 Version 2.06 Convergent muscles Fibres come together (spread out) to a common attachment site Ex: pectoralis major m. Direction of pull can be changed by stimulating different fibres of m. Less strength than parallel m. of same size
  • Slide 7
  • CSEP - CPT M-S Theory2006 Version 2.07 Pennate M. 1+ tendons run through body of muscles & fascicles form an oblique angle to tendon Contain more m. fibres than a parallel m. of same size generates ______ tension Unipennate Bipennate Multipennate
  • Slide 8
  • CSEP - CPT M-S Theory2006 Version 2.08 Attachments Origin: less movable attachment of a m Insertion: more movable attachment of a m insertion is pulled toward the origin Direct attachment: epimysium of muscle is fused to periosteum or perichondrium Indirect attachment: tendon or aponeurosis Gross Anatomy
  • Slide 9
  • CSEP - CPT M-S Theory2006 Version 2.09 Primary Actions Prime mover (agonist) Contraction is responsible for movement Synergist Assists prime mover Antagonist Oppose action of agonist Tension adjusted to control speed of agonist
  • Slide 10
  • CSEP - CPT M-S Theory2006 Version 2.010 Assessment of Muscular Strength Key Concepts: 4.16
  • Slide 11
  • CSEP - CPT M-S Theory2006 Version 2.011 Definitions Muscular strength: peak force or torque developed during a maximal voluntary contraction (MVC) Muscular power: rate at which mechanical work is performed Maximal amount of force one can exert in the least amount of time (force/time) Muscular endurance: ability to exert sub-maximal force repeatedly, or sustain a static contraction without fatigue
  • Slide 12
  • CSEP - CPT M-S Theory2006 Version 2.012 Force Generation Ability of a muscle or muscle group to generate force depends on Size of muscle Type of contraction Number of muscle fibres activated Ability of nervous system to activate muscle fibres MOTIVATION of the client! Strength potential is limited by genetics Number of fast-twitch fibres
  • Slide 13
  • CSEP - CPT M-S Theory2006 Version 2.013 Why Test Strength & Power? To develop profile of client To monitor training progress To monitor the rehabilitation of injuries To assess health status ????
  • Slide 14
  • CSEP - CPT M-S Theory2006 Version 2.014 Gender & Aging Men typically have greater muscle mass and cross-sectional area than women Rate and pattern of strength development and decline in age are similar for both genders Peak strength: females late teens and males during their 20s.
  • Slide 15
  • CSEP - CPT M-S Theory2006 Version 2.015 Gender & Aging: Strength Decline in strength begins at age 45 to 50 and progresses at a rate of 12-15% per decade 25-40% of muscular strength is lost by the 6 th or 7 th decade Large portion of the decreased strength in old age is due to muscle atrophy Women tend to have a higher percentage loss of strength than men
  • Slide 16
  • CSEP - CPT M-S Theory2006 Version 2.016 Gender & Aging: Strength Grip Strength: Good indication of overall muscular strength Early screening of populations to identify those at higher risk for physical disability related to low muscle strength Cutoff score of 21.0 kg minimum level of old-age grip strength Individuals with scores close to this value are 8X the risk of developing muscular strength disabilities Good indicator of high and low levels of health status Warburton et al. Can J Appl Physiol 26(2): 217-237, 2001. Warburton et al. Can J Appl Physiol 26(2): 161-216, 2001.
  • Slide 17
  • CSEP - CPT M-S Theory2006 Version 2.017 Theoretical relationship between musculoskeletal fitness and independence across the lifespan. Musculoskeletal Fitness 10203040 50 607080 Disability Independent Living 0 Age (yr) Threshold for Dependence Warburton et al. CMAJ 2006
  • Slide 18
  • CSEP - CPT M-S Theory2006 Version 2.018 Gender & Aging: Muscular Endurance Loss in endurance with aging is also significant Peak partial curl-up scores: 13-15 yr Peak back extensor endurance scores: 20-29 yr Average performance for endurance tests (push-ups, partial curl-ups and back extensor endurance) decline dramatically through to 60- 69 yr range
  • Slide 19
  • CSEP - CPT M-S Theory2006 Version 2.019 Gender & Aging: Muscular Endurance Push-ups and partial curl-ups are less significant predictors of overall musculoskeletal health in comparison to grip strength for both genders Males: Push-ups and grip strength are the strongest discriminators between high and low health Females: Grip strength and sit & reach are the strongest discriminators between high and low health Payne et al. Can J Appl Physiol 25(2): 114-126, 2000.
  • Slide 20
  • CSEP - CPT M-S Theory2006 Version 2.020 Gender & Aging: Power Greater loss in power with aging compared to muscular strength & endurance Maybe due to the loss in FT fibres Women have lower leg extensor power than men Gender differences begin in the teens and continue throughout life
  • Slide 21
  • CSEP - CPT M-S Theory2006 Version 2.021 Musculoskeletal Fitness in MSF with age is not solely due to age itself but to physical inactivity and/or chronic disease Strength training can offset the loss in muscular strength and muscle mass associated with aging Improves the ability to perform activities of daily living, improve bone health and reduce the risk of falling
  • Slide 22
  • CSEP - CPT M-S Theory2006 Version 2.022 Strength Testing When choosing a strength test consider: Clients goals Specificity Equipment Upper & lower body strength measure, and abdominal endurance Always ensure subject is warmed up & familiar with all equipment Keep motivation consistent!!!!
  • Slide 23
  • CSEP - CPT M-S Theory2006 Version 2.023 Absolute or Relative Strength? Absolute strength = MVC (in Newtons or kg) MVC = maximum voluntary contraction Relative strength = MVC / body mass
  • Slide 24
  • CSEP - CPT M-S Theory2006 Version 2.024 Isotonic Contractions Concentric contraction Muscle shortens during tension development Weight is lifted Eccentric contraction Muscle lengthens during tension development Weight is lowered Able to generate higher forces Greater risk for injury What is the maximal weight that can be lifted during a concentric contraction?
  • Slide 25
  • CSEP - CPT M-S Theory2006 Version 2.025 1-RM Maximal amount that can be lifted in one complete repetition with proper technique Can be used to rate health status, establish exercise prescription workloads, and/or monitor a resistance training program Limitations of 1-RM test Injury Technique Economy of test Outside of the Scope of Practice of a CSEP-CPT! Outside of the Scope of Practice of a CSEP-CPT!
  • Slide 26
  • CSEP - CPT M-S Theory2006 Version 2.026 Predicting 1-RM Muscular endurance is directly related to muscular strength THEREFORE, 1-RM can be predicted without performing a maximal lift Usually 6 to 10-RM test
  • Slide 27
  • CSEP - CPT M-S Theory2006 Version 2.027 Submaximal Predicted 1-RM Single Set Warm up at 40-60% of estimated 1-RM for 5- 10 reps Stretch during 1 min rest period 1 set of 10 reps at 60-80% of estimated 1-RM >10 reps completed, then client gets a 3-5 min rest Increase weight client attempts up to 10 reps
  • Slide 28
  • CSEP - CPT M-S Theory2006 Version 2.028 Predicted 1-RM (Baechle & Earle) determine %1-RM from # of reps completed divide weight lifted by % 1-RM EXAMPLE: client performed 8 repetitions of 100 lbs Reps Completed % 1-RM 1100 295 393 490 587 685 783 880 977 1075 8 repetitions = 80% 1-RM 1-RM = 100 lbs lifted/.80 1-RM = 125 lbs
  • Slide 29
  • CSEP - CPT M-S Theory2006 Version 2.029 PRACTICE! Groups of 3-4 1 person client; 1 acts as appraiser; 1 observes Calculate results for different muscle groups
  • Slide 30
  • CSEP - CPT M-S Theory2006 Version 2.030 Muscle Balance A strength imbalance between opposing muscle groups may compromise joint stability & increase risk of injury Muscle balance ratios differ between muscle groups Crude index can be obtained by comparing 1-RM Muscle GroupsRatio Hip extensors/ flexors1:1 Elbow extensors/ flexors1:1 Trunk extensors/ flexors1:1 Ankle inverters/ everters1:1 Shoulder flexors/ extensors2:3 Knee extensors/ flexors3:2 Shoulder internal/ external rotators 3:2 Plantarflexion/ dorsiflexion3:1 Strength Comparison Right & left side10-15% Upper to lower body40-60%
  • Slid