Activity Monitors Flashcards
Purpose of portable electronic heart rate meters?
Used to infer metabolic activity in free-living (vs. laboratory) subjects
Fxn of pedometers
Count steps
Where are pedometers worn
At hip or ankle
Science behind pedometer
- low cost pedometers use simple mechanical switch
- when limb movement causes large enough perturbation of the monitor the switch closes momentarily and pedometer registers a step
What are accelerometers
- piezoelectric crystals that have property of producing tiny voltage proportional to amount of strain on crystal
3 things heart rate meters can measure?
- intensity of action
- metabolic rate
- caloric expenditure
Characteristics of heart rate meters
small, light, minimally intrusive
heart rate is a valid and reliable indicator for what in most cases?
exercise intensity
What is reliability
Similar value obtained on repeat measures under similar conditions
4 situations in which heart rate does not accurately reflect exercise intensity
- Arm work: HR overestimates intensity
- Prolonged exercise: HR drifts upward
- Medications: May limit HR increase
- Horizontal: HR lower for a given intensity compared w/upright posture
3 subjects written about activity monitor discussed in textbook
- accuracy of monitors (special consideration is the quantification of activity among children and youth)
- use of activity monitors to see if an “intervention” makes people more active
- does giving people a pedometer result in an increase in their activity level
When is inaccuracy of pedometers the greatest
at lower walking speeds or very fast walking/running
4 steps to ensure pedometer counts steps accurately
- attach device at waistline, directly above kneecap
- don’t attach pedometer to loose garments like dresses
- regularly check pedometer while ur walking to make sure doesnt shift out of position
- unless otherwise instructed, wear pedometer in 1upright position
Accuracy of pedometers varies with what factors
One’s walking speed, stride length, & force w/which one’s feet strikes the ground
What pre check can be done to check accuracy of pedometer?
clip to waist or belt & check accuracy by counting ur steps as u walk ur normal walk, then compare steps w/what pedometer indicates
Describe the sensitivity vs. specificity dilemma with pedometers
- how large a movement should be counted as a step?
- if sensitivity too low, some real steps overlooked
- if specificity too low, minor movements that aren’t “real” steps will be counted
Advantages of using pedometer to assess daily or weekly activity patterns as a whole
- cheap
- objective
- does not interfere w/daily activities & is thus appropriate to use in population studies
advantage of commercial accelerometer with time-sampling mechanism
could be used to provide a picture of the pattern of children’s activity
if wanting to use pedometers to motivate people to become more active, what aspect is more important and less important?
- accuracy doesn’t matter
- reliability matters
Example of indirect calorimetry
measurement of oxygen consumption
Main finding of Couter et al. (2003) for pedometer study?
pedometers most accurate for counting steps, less accurate for assessing distance, and even less accurate for assessing kcal
Main finding of Melanson et al. (2004) for pedometer study?
even at very slow speed of 1.0 mph, accuracy of piezoelectric pedometer while not good, was better than spring-levered pedometers
Main findings of Crouter, Schneider & Basset for pedometer study?
- in overweight and obese individuals, piezoelectric pedometer more accurate than spring-levered pedometer esp at slower walking speeds
- pedometer tilt (more than waist circumference and BMI) most important factor influencing accuracy of spring-levered pedometer
- piezoelectric pedometer not affected by pedometer tilt, waist circumference, or BMI
For Craig, Cameron, and Cragg study, avg # of steps reported was…
- less than that recommended to maintain healthy body mass
- Higher among males
- Higher in the West
- Higher among those said they participate in organized PA and sport
- Lower among those who said they prefer quiet activities
During Bruner et al. (2006) study involving youth, what did the results show
- inc in activity from oct to dec
- steady decline in each of the 3 subsequent periods
- greatest dec from feb to april
Why are children less likely to make accurate self-report assessment than adults
developmental differences, esp in ability to think abstractly and perform detailed recall
McMurray’s study on MVPA for adolescence showed what
3 day recall period too long for accurate recall of MVPA info
- for both genders survey overestimates activity lvls
Problems with using heart rate telemetry to give estimates of daily activity in children
- heart rate indirect estimate of PA and makes assumptions based on linear relationship btwn heart rate & oxygen uptake
- heart rate sensitive to emotional stress, body position, takes longer to reach resting lvls after physical exertion compared w/o2 uptake
- lags behind movement (bad cause children’s PA sporadic in nature)
What characteristics must instrument posses to accurate assess children’s activity patterns
- must be sensitive enough to detect, code, or record sporadic & intermittent activity
Out of heart rate monitoring, pedometry, triaxial accelerometry, and uniaxial accelerometry, which was the best measure for estimating oxygen consumption during typical Welsh children’s activities
triaxial accelerometry
Beets, Patton, & Edwards study accuracy of pedometers during self-paced walking and treadmill walking in children showed what
same pedometer inaccuracy at slower walking speeds as has been observed in adults
- time might be used in addition to steps to quantify the PA behaviour of children
Suggestions to improve assessments of PA in children with monitors?
- focus assessments on key times or places that allow children to be active
- monitoring of entire groups for discrete periods of time useful to understand variability in activity patterns since children would all be exposed to same stimulus or opportunity to be active
- proxy measures useful (e.g. time spent outside strongly predictive of activity in children)
- employ multiple measures of PA to provide more complete description of children’s activity & permit a triangulation of outcomes
How many steps did people take in a typical day in Tudor-Locke et al. study?
~10,000 +/ 3000
According to Tudor-Locke et al. study, when is the best time during the year to sample if want to collect data that is representative of the whole year?
Spring or fall, not summer
Speck & Looney study on whether minimal intervention (daily records of physical activity) increases activity levels in a community sample of working women demonstrated what
Intervention group recorded significantly more steps than contorl group
Talbot et al showed what
Home-based pedometer-driven walking program w/arthritis self-management education inc PA, strength, fxn of group compared to arthritis self-management education group alone
Rooney et al. (2003) study on female employees showcased setting daily step goals, keeping a log of steps walked, and wearing the pedometer all the time were the indicators most likely to predict significant improvement in levels of ___?
awareness & amount of PA, self-efficacy, & other physical improvements
In Croteau (2004) study on college employees, who experienced the greatest increase in steps
participants who averaged fewer than 6,000 steps & obese participants
Roemmich, Gurgol and Epstein (2004) used what to motivate PA? Results?
- TV access when accumulated PA counts
- intervention group had increased PA activity
Chan, Ryan, and Turdor-Locke (2004) study of effects of pedometer-based activity intervention showed?
- on avg, participants experienced significant dec in BMI, waist girth, & resting heart rate
- reduction in waist girth & heart rate were significantly related to inc in steps per day
Stewart et al (2004) study showed what results
Take 10! program effective in providing moderate-to-vigorous intensity PA
Ball et al. (2004) study showed what
print-plus-telephone group maintained higher lvls of global reported activity & walking than those in print group
What does communication facilitate
understanding
What is communication
a way to share info, to establish rapport, to emphasize
how do humans communicate
- with sophisticated verbal and symbolic (e.g. mathematical, computer) languages
- give & receive subtle and rich non-verbal msgs
- person on receiving end gives verbal and non-verbal signals
What comprises active listening
- with sophisticated verbal and symbolic (e.g. mathematical, computer) languages
- give & receive subtle and rich non-verbal msgs
- person on receiving end gives verbal and non-verbal signals
3 reasons why beginnings are important
- They set the tone
- They are an opportunity to establish rapport, thru display of genuineness, empathy, & warmth
- They are a time to clarify expectations
4 open-ended questions counselors use that are effective
- Why do you think that is?
- What do you think might help?
- Has this ever happened before?
- What did you do about it then?
What are closed-ended questions
Those that can be answered briefly, usually with a single word like yes or no
- tend to stifle rather than encourage dialogue
why ask open ended questions instead of closed ended
to elicit lengthier answers
what to do when client wandered off topic or repeating herself
refocus session
- “ok im getting good picture of how u spend ur weekends, how do u spend ur weekdays?”
what type of body language should you display when talking to client
- position urself close enough to client to be able to be converse in a normal voice (1-2 meters) while not invading personal space
- position urself so your eyes are at the same level of clients
- rest arms on legs or arm of chair, rest feet on floor
- make eye contact but don’t stare
- turn body so generally faces client
in a good counselling session, how much talking does counsellor do
20%
4 skills of active listening, example of each
- Bridging - use of little words like “yes, go on, I see”
- signal to speaker ur listening - Restating - repeating last word or few words of client
- “often i plan to run after work but i’m too tired. i’m usuall so organized idk whats wrong.” “counsellor: what’s wrong..?” - Paraphrasing - summarizing in own words what u heard
- ensure u understand what client thinking n feeling
- “it sounds as tho u r looking forward to brothers visit but concerned itll interfere w/ur workout sessions” - Asking for clarification - when ur not sure u’ve understood client
- “could you elaborate on that”
what is reactance
- counsellor wants to avoid causing client to “react”
- reactance presents in negative cognition like “I hate you”
- the reacting person perceives a threat to their freedom & respond by becoming defensive and stubborn
- reactance causes person to do more of the behaviour u r trying to get them to stop
- more likely in response to explicit, threatening language, or dogmatic, authoritarian, or domineering tone
- subject w/high reactance scores more prone to rxn than others
1st step when working w/new person or group is to? next steps?
- establish rapport
- explore issues
- mobilize his/their resources
- develop self-efficacy
how does a group leader change over time in a group that starts to mature
- initially directive, as group develops confidence & self-efficacy and matures, an effective leader will back off and give inc responsibiity n autonomy to group
Characteristics of teaching
- plan but be flexible
- have a standard format, but use variety
- plan the session in 20-min ‘chunks’. learning falls off dramatically as attention span wanes
- keep it simple
- more is not better
- first demonstrate, & then explain
- if the msg is complex, give it in writing
goal of counsellor?
support change
what should a counsellor do
- help client frame the problem “Why are u here? What would u like to happen?”
- help client explore the issue “what have u tried in the past”
- try to build self-efficacy
Process of active listening with client and counsellor
- Develop rapport w/client
- Create a comfortable environment
- Establish a helping relationship
- Structure ur sessions
- Help client develop alternatives in pursuit of active living
- Gather data about: clients lifestyle, activity preferences, activity levels, goals/aspirations, physical conditions
- Engage in mutual problem solving
- Determine realistic goals
- Make appropriate changes
- Recognize limits to ur expertise, & refer as indicated to qualified specialists for issues such as: mental health, substance abuse, eating disorders, family/martial issues, medical conditions