Heavy shoulder strengthening exercise in people with hypermobility spectrum disorder (HSD) and long-lasting shoulder symptoms: a feasibility study

Table 1 Research progression criteria for continuing to the definitive randomised controlled trial

Outcome	Green	Amber	Red
Participant recruitment	Inclusion rate of one participant per general practitioner or physiotherapist every month (approximately n = 6–8/month)	(n < 6 after first month). If recruitment rate falls behind, screening logs and reasons for exclusion will be explored after the first month to adjust eligibility criteria.	No recruitment after 2 months
Completion of the outcome measures	Mean < 120 min to complete all objective outcome measures, and that at least 67% of participants found the duration acceptable.	Between 121 and 150 min, or only 50–66% of participants found the duration acceptable.	> 150 min or < 50% of participants found the duration acceptable
Participant retention	10 or more participants show up at 16-week follow up	Only 6–9 participants show up at 16-week follow up.	Below 6 participants show up at 16-week follow up.
Adherence to exercise intervention	Minimum 75% of participants adhering to at least 75% of exercise sessions.	Only 50–75% of participants adhering to 50–75% of exercise sessions.	< 50% of participants adhering to < 50% of exercise sessions
Adverse events	No or minor adverse events with no participants discontinuing the study	Minor or serious adverse events leading to 2 or less participants discontinuing the study	Serious adverse events leading to > 2 participants discontinuing the study

Research progression criteria were based on a traffic light system of green (go), amber (amend) and red (stop) [24]. Results of these research progression criteria were evaluated by the research group, who recommended whether to proceed with the definitive randomised controlled trial, and which amendments that needed to be made before proceeding

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