Design and Validation of FEXO: A Playful Exercise Program for Institutionalized Frail Older Adults

This composite outcome evaluates changes in intrinsic capacity, following the five-domain model proposed by the World Health Organization: cognition, vitality, locomotion (function), sensory function, and psychological well-being. Each domain is assessed through one standardized test: the Mini-Mental State Examination (MMSE) for cognition, the Mini Nutritional Assessment (MNA) for vitality, the Short Physical Performance Battery (SPPB) for locomotion, self-reported vision and hearing for sensory function, and the Cornell Scale for Depression in Dementia (CSDD) for psychological well-being. Each test contributes up to a maximum of 2 points, according to predefined cut-off values. For the cognitive domain (MMSE), 2 points are assigned if ≥27, 1 point if 10-26, and 0 points if 0-9. For vitality (MNA), 2 points are assigned if 24-30, 1 point if 17-23, and 0 points if <17. For locomotion (SPPB), 2 points are assigned if ≥10, 1 point if 3-9, and 0 points if 0-2. For sensory function (self-r

Frailty status will be assessed using Fried's phenotype, which classifies participants as robust (0 criteria), pre-frail (1-2 criteria), or frail (3-5 criteria) based on five components: unintentional weight loss, exhaustion, low physical activity, slow gait speed, and weak grip strength. Improvement is defined as transition to a lower frailty category (e.g., from frail to pre-frail).

The SPPB evaluates lower-extremity function through three subtests: standing balance (performed with feet together, semi-tandem, and tandem), gait speed over a 4-meter distance, and a five-times sit-to-stand test. Each subtest is scored from 0 to 4, for a total score ranging from 0 to 12. Higher scores indicate better physical performance. The SPPB is predictive of disability, hospitalization, and mortality in older adults.

This test assesses functional mobility and risk of falling. Participants are instructed to rise from a standard chair, walk 3 meters, turn around, walk back, and sit down. The total time (in seconds) is recorded. Lower times indicate better mobility and balance. The TUG has high predictive value for fall risk in frail older populations.

Grip strength will be measured using a JAMAR hand dynamometer, with participants seated, the elbow at 90°, forearm in a neutral position, and wrist slightly extended. The best of three trials is recorded in kilograms. Grip strength is a core indicator of sarcopenia and a strong predictor of functional decline, morbidity, and mortality. Higher values reflect better upper-limb muscle strength.

Participants will perform two walking trials over 10 meters: one at habitual pace and one at maximum pace. The time to walk the central 6-meter portion is recorded and converted into meters per second (m/s). Gait speed is a validated marker of frailty, physical function, and fall risk. Higher walking speeds reflect better functional status.

The MMSE evaluates general cognitive status through domains including orientation, memory, attention, language, and visuospatial skills. It yields a score from 0 to 30, with higher scores indicating better cognitive function. It is widely used for screening and monitoring cognitive impairment in older adults.

The MNA is a validated tool for detecting malnutrition or risk of malnutrition in older adults. It includes 18 items covering anthropometry, general health, dietary intake, and subjective assessment. Total scores range from 0 to 30: scores ≥24 indicate normal nutrition, 17-23.5 suggest risk of malnutrition, and <17 indicate malnutrition. Higher scores reflect better nutritional status.

The GDS short form (15 items) will be used to screen for depressive symptoms in participants. Responses are binary (yes/no), and total scores are calculated. Higher scores indicate more depressive symptoms; scores >5 may indicate clinical depression. Lower scores represent better psychological well-being.

This 14-item scale assesses balance and postural control in older adults. Each task (e.g., standing, reaching, turning) is scored from 0 (unable) to 4 (independent), with a total score ranging from 0 to 56. Scores below 45 suggest increased fall risk. Higher scores reflect better balance.

This scale measures independence in 10 basic activities of daily living (ADLs), including feeding, grooming, bathing, dressing, bowel and bladder control, toilet use, transfers, mobility, and stair use. Scores range from 0 to 100, with higher scores indicating greater functional independence. The index is commonly used in geriatric and rehabilitation settings.

The Cornell Scale for Depression in Dementia (CSDD) will be used to assess depressive symptoms in participants with or without cognitive impairment. The scale consists of 19 items covering mood-related signs, behavioral disturbances, physical signs, cyclic functions, and ideational disturbances. Each item is rated from 0 to 2 (0 = absent, 1 = mild or intermittent, 2 = severe), based on interviews with both the patient and an informant. Total scores range from 0 to 38, with higher scores indicating more severe depressive symptoms. Scores above 10 suggest probable major depression, while scores above 18 are highly indicative of a depressive disorder. Lower scores represent better psychological well-being.

Self-reported vision will be assessed through a single-item question asking participants to rate their visual ability. Responses are scored as follows: 0 = severe difficulty or complete blindness, 0.5 = mild to moderate difficulty, and 1 = no difficulty. Higher scores indicate better sensory function.

Self-reported hearing will be assessed through a single-item question asking participants to rate their hearing ability. Responses are scored as follows: 0 = severe difficulty or complete deafness, 0.5 = mild to moderate difficulty, and 1 = no difficulty. Higher scores indicate better sensory function.