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Table 4 Selection of original items used to previously assess Self-determination theory linked constructs, and our assessment of suitability for use in the e-coachER study

From: A process evaluation, with mediation analysis, of a web-based intervention to augment primary care exercise referral schemes: the e-coachER randomised controlled trial

Reference

Subscale

Item

Include?

Reason

Basic Psychological Needs in Exercise Scale [27]

Competence

I feel I have made a lot of progress in relation to the goal I want to achieve

No

Not relevant for baseline assessment of competence as no progress would have been made at baseline

I feel I perform successfully the activities of my exercise program

No

Not relevant for baseline assessment of competence as refers to exercise programme which participant may not have yet started

I feel exercise is an activity which I do very well

Maybe

Does not refer to an ‘exercise programme’ however may be confusing/irritating to non exercisers

I am able to meet the requirements of my exercise program

No

Not relevant for baseline assessment of competence as refers to exercise programme which participant may not have yet started

Autonomy

The way I exercise is in agreement with my choices and interests

No

Not relevant for baseline assumes already exercising

I feel that the way I exercise is the way I want to

No

Not relevant for baseline assumes already exercising

I feel that the way I exercise is a true expression of who I am

No

Not relevant for baseline assumes already exercising

I feel that I have the opportunity to make choices with regard to the way I exercise

Maybe

May not necessarily imply already exercising

Relatedness

My relationships with the people I exercise with are very friendly

No

Not relevant for baseline assumes already exercising

I feel I have excellent communication with the people I exercise with

No

Not relevant for baseline assumes already exercising

My relationships with the people I exercise with are close

No

Not relevant for baseline assumes already exercising

Perceived Competence Scale (PCS) [43]

Competence

I feel confident in my ability to exercise regularly

Yes

Asks a direct question relating to how one might feel about exercising regularly, but does not assume already is

I now feel capable of exercising regularly

Maybe

Poor face validity for baseline measurement if participants are not already physically active

I am able to exercise regularly over the long term

Maybe

Asks about ability to maintain exercise over long term

I am able to meet the challenge of exercising regularly

Maybe

Asks about ability to meet challenge of exercise

Psychological need satisfaction in exercise scale (PNSE) [44]

Competence

I feel that I am able to complete exercises that are personally challenging

No

Not relevant to baseline non exercisers

Refers to ‘challenging’ exercise which may not be appropriate for target population

I feel confident I can do even the most challenging exercises

No

Not relevant to baseline non exercisers

Refers to ‘challenging’ exercise which may not be appropriate for target population

I feel confident in my ability to perform exercises that personally challenge me

Maybe

Talks about confidence and ability for more personal challenges

I feel capable of completing exercises that are challenging to me

Maybe

Talks about confidence and ability for more personal challenges

I feel like I am capable of doing even the most challenging exercises

No

Not relevant to baseline non exercisers

Refers to ‘challenging’ exercise which may not be appropriate for target population

I feel good about the way I am able to complete challenging exercises

No

Not relevant to baseline non exercisers

Refers to ‘challenging’ exercise which may not be appropriate for target population

Autonomy

I feel free to exercise in my own way

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

I feel free to make my own exercise program decisions

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

I feel like I am in charge of my exercise program decisions

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

I feel like I have a say in choosing the exercises that I do

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

I feel free to choose which exercises I participate in

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

I feel like I am the one who decides what exercises I do

Maybe

If amended to ‘physical activity’ may not necessarily imply someone is ‘exercising’ already as assume some level of activity even if very minimal

Relatedness

I feel attached to my exercise companions because they accept me for who I am

No

Not relevant for baseline assumes already exercising

I feel like I share a common bond with people who are important to me when we exercise together

No

-Not relevant for baseline assumes already exercising

I feel a sense of camaraderie with my exercise companions because we exercise for the same reasons

No

-Not relevant for baseline assumes already exercising

I feel close to my exercise companions who appreciate how difficult exercise can be

No

-Not relevant for baseline assumes already exercising

I feel connected to the people who I interact with while we exercise together

No

Not relevant for baseline assumes already exercising

Intrinsic Motivation Inventory

[45]

Autonomy

I exercise because I like to rather than because I feel I have to

No

Not relevant to baseline non exercisers

  

Exercising is not something I would necessarily choose to do, rather it is something that I feel I ought to do

Maybe

Does not necessarily imply already exercising

  

Having to exercise is a bit of a bind but it has to be done

Maybe

Does not necessarily imply already exercising