Exercise Equipment, cont’d

Reading assignment for today, Tues Oct 11- Ch 13 from Kreighbaum & Smith on Aerobic Equip- Journal article on evaluation of home ex equip

Assignment for Tues, Oct 18- Submit two questions on aerobic or resistive

equipment for discussion - Read Ch 14 from Kreighbaum & Smith on resistive

exercise equip- Read pp 257-263 from Kreighbaum and Barthels on

resistive exercise equipment

Exercise Equipment, cont’d

Plan for today, Tuesday Oct 11- Discuss selected questions submitted by you- Review selected slides from scientific found lecture- Review ACSM journal article- Introduce Aerobic Equipment Evaluation topic

SGMA Stats on Ex and Sport Equip Total Ex & Sp Equip Sales for 04 - $18 billion

- Sport equipment – $14 billion• Golf - $2.42 billion• Baseball/softball - $475 million

- Exercise equipment - $4 billion• Treadmills - $1 billion or 25% of ex equip

– 11.3 million participants

• Home gyms - $305 million• Exercise cycles - $200 million• Elliptical machines - $140 million

– 3.3 million participants

Athletic footwear (not included in above) - $10 billion- Running/jogging shoes - $2.8 billion- Basketball shoes - $2.1 billion- Cross-training/fitness shoes - $1.1 billion

Source: Sporting Goods Mfg Assoc website

Strength-PositionCurves:

Resistance-PositionRelationship:

Remember T = WD + IWhen is acceleration positive?Zero?Negative?

Use of Cams in Ex Equipment:

Sample Resistive Exercise Program Basic Program - required

- Squat with heel raise- Trunk curl (goal is 30 reps)- Bench press- Sit or bent row- Upright press- Pull downs or chins

Optional exercises- Back extension from prone position- Forearm curl- Forearm extension or dips

Note: This program incorporates the principles of bilateral and agonistic-antagonistic balance and focuses on muscular strength and endurance development of the antigravity musculature. At least two sets (one with light weight for warmup), and preferably three sets, of each exercise should be completed at 10-15 RM.

What exercises would you change or add?

Questionable exercises

Hyperextended back Good morning exercise Straight leg deadlift Deep knee bends beyond thighs parallel Behind neck press Unsafe abdominal exercises

Spine loading – one big leg (disc and vertebral body), two smaller legs (facet) in rear. Balance the load

Questionable exercises:Hyperextended back

“Good morning” exercise

Straight-leggedDeadlift:

Squats: It depends onhow you do it!

Behind the neck press:

Situp Exercises:

Which methods arePotentially harmful?

In what way?

Aerobic Exercise Equipment

Reading assignment:- Ch 13 of Kreighbaum & Smith - pp 247-256 Kreighbaum & Barthels

Preview these websites:• American Council on Exercise research site• Primusweb site - guidelines for equipment evaluation• Federal trade commission

Source: (Jung, A.P. The evaluation of home exercise equipment claims. ACSM’s Health and Fitness Journal. 4(5): 14-16,30-31.

Evaluation criteria:- Is equipment capable of producing advertised benefits (full-body workout in 5

minutes, 2 times calories burned using treadmill, improves flexibility, muscular fitness and weight loss)

Evaluation methods:- Check physiological and biomechanical principles and ACSM standards.- Review research, if available

• Critically review research – Are appropriate methods used? Who sponsored it? Where was research reported?

- Ask professors or other experts (Barstow, Harms, Noble, Trost) - Review product reviews on internet and in fitness magazines (Club Industry,

Athletic Business, Fitness Management)- Try it yourself- Interview professionals who have supervised its use- Design and conduct your own research

Evaluation of Exercise Equipment

Relevant Questions for Equipment Selection (Criteria)

Specific criteria will vary with the specific type and purpose of the equipment

Biomechanical correlates indicative of efficacy Physiological correlates indicative of efficacy Psychological correlates indicative of efficacy Does it do what it should do? Does it do what the manufacturer claims? Is the product effective for all people who are intended to

use it (different sizes, skill levels, fitness levels, ages)? Is it safe? What does it cost?

Aerobic Exercise Equipment

Purpose - to increase aerobic capacity Most equipment simulates walking, jogging, or running.

- How about swimming?- Why not just do these instead of buying equipment?

Evaluate Efficacy of Each Type, or mode, of Equipment Below for institutional and personal use:- Cross-Country Ski Simulators Chart, p 161)- Stationary Cycles (Chart, p 165)- Treadmills (Chart, p 167)- Rowing Machines (Chart, p 170_- Jump Ropes (Chart, p 171)- Stair Steppers (Chart, p 174)- Elliptical exercisers- Treadclimber

Ski Simulators

Stationary cycle:

Stationary Cycles

Treadmills

Reviewed in Consumer Reports March 2002, p 13;Feb 2004, p 33-35 and January 2005, pp 17-21

Rowing Machines

Stepping macines

Stepping machines

Hybrid:Elliptical

exercisers

Evaluated in Consumer RepMarch 2002, p 16 and Jan2005, pp 17-21

Hybrid:Treadclimber

Reviewed in Consumer reports Jan 2004, p 18

Which aerobic exercise mode is best?

Compare each mode relative to the following criteria- Degree of overload on cardiorespiratory system (Consumer

reports Mar 2002, p 13)- Relevance to fundamental movements and ADL’s- Proportion of total body musculature involved- Degree of compressive stress on femoral head and lumbar

vertebral bodies (sites of most osteoporotic fractures)- Compressive stress on patella and knee joint- Range of motion and torque at hip, knee, and lumbar spine- Motivational features (comfort, user friendly, feedback, RPE)- Likelihood of continued usage- Cost- Other?

Comparison of Aerobic Ex Modes

Comparison of Aerobic Ex Modes

Comparison of Aerobic Ex Modes

Approximate Cost of Aerobic Exercise Equip at Rec Complex

Rowers $1,000 Stationary Bikes (upright & recumb) $2500 Elliptical exercisers $3200 SciFit Total Body Crosstrainer $4000 Stairstepping machines $4500 Hybrid – Cybex Arctrainer $5000 Treadmills $5000-$8000

Cross-country ski simulators

Advantages- Potential for high energy expenditure- Good off-season training for skiing competition- Can talk or listen or watch- Non-impact

Disadvantages- Not easy to learn to use- Need to develop skill- None have capability to convert exercise effort into

repeatable intensity- Most models have poor feedback on work intensity

Stationary cycles Advantages

- Inexpensive, compact, portable- Can listen, talk, and watch- No heel-strike forces (.6 g)- Good feedback on work rate and energy expenditure- Easy to use

Disadvantages- Sore butt can be a problem- Boring- Only works the legs – those with poorly conditioned leg muscles

will fatigue quickly- Low carryover to ADL’s- Higher RPE than treadmill or ellipticals

Treadmills Advantages

- Good carryover to locomotion- Can get good aerobic overload- Can control speed and slope and can be programmable and

reproducible- Weight bearing – high GRF’s- Easy to learn how to use- Greatest incidence of use in homes- Lower RPE than most other aerobic ex machines

Disadvantages- Expensive- Impacts and high VGRF may exacerbate lower extremity problems- Not portable and compact- Noisy

Hybrid: Elliptical Exercisers Advantages

- Can get good aerobic overload- Cheaper than treadmills & stepping machines- Lower RPE for same workout intensity - Low impact – less stress on lower extremities while allowing a weight-bearing

exercise- Easy and safe to use- No motor- less noisy than treadmills- Can control speed and slope and can be programmable and reproducible

Disadvantages- Low impact and lower VGRF than treadmills- Movement is less similar to normal locomotion pattern than treadmills- Many models do not allow sufficient stride length for taller people

Rowing machines Advantages

- Uses large muscle mass than cycling- Greater energy energy expenditure than cycling- Can talk or listen or watch- Non-impact- Cheap- Easy to learn how to use

Disadvantages- Limited capability for incrementing and reproducing

workload- Untrained rowers may fatigue quickly- Low carryover to ADL

Stepping machines

Advantages- Low impact - Can talk or listen or watch- Easy to learn how to use- Relatively inexpensive

Disadvantages- High knee torque and patellar compressive forces

(hard on knees)- Minimal trunk and upper body involvement- Can be boring

Exercise Equip of Questionable Value

Devices which purport to provide great benefits with little effort

Devices to vibrate, melt, or massage away fat Stretching, pulling, or pushing devices Wearing or carrying weights Others that you can think of?

Other websites on exercise equipment

Source for exercise equipment:- Fitnessquest home page- http://www.exerlopers.com/

Sites including exercise equipment research :- ISU Dept of OT- Precor research page- Sportscience journal