Schilling 2009.

Methods	Type of study: RCT
Participants	Number of participants randomised: 19 Losses: none reported Age: 60 to 68 years Sex: 10 men, 9 women Residential status of participants: community dwelling Health status as defined by authors: healthy Setting: USA Inclusion: healthy with no orthopaedic limitations or vestibular problems, active but not partaking in structured exercise. Exclusion:
Interventions	EXERCISE GROUP (GBFT) (n = 10): standing balance training using VersaDisc and CorDisc devices adjustable air filled devices. progressively challenging CONTROL GROUP (n = 9): usual activities Duration and intensity: 15 to 30 min, 3 x week, 5 weeks Supervisor: Certified Strength and conditioning specialist. Supervision: Individual Setting: clinic
Outcomes	TUG (s) Force plate, left leg and right leg, eyes open, eyes closed LOP (cm) Compliance/adherence: not reported Adverse events: No adverse events reported.
Notes	only TUG data reported, other data reported graphically only
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomisation mentioned but Insufficient information to permit judgement
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	‘As‐treated’ analysis done, unclear whether drop outs existed but no detail reported
Selective reporting (reporting bias)	Unclear risk	Insufficient information to permit judgement
Other bias	Low risk	The study appears to be free of other sources of bias
Blinding (participant)	Unclear risk	Not possible
Blinding (assessor)	Unclear risk	Insufficient information to permit judgement
Were the treatment and control group comparable at entry?	Unclear risk	Insufficient information to permit judgement
Was the surveillance active, and of clinically appropriate duration (i.e. at least 3 months post intervention)?	High risk	Only immediately post intervention data, no follow‐up data reported.