Boxing Training, Physical-functional Fitness and Cognitive Performance in Older Adults

This will be tested with a 3 kg (Ø 0.60 m) medical ball. Each subject will sit in a chair with the posterior region of the trunk positioned against the back of the chair and hold the ball forward with both hands. Three approved trials will be conducted with one-minute rest intervals between each trial to ensure that fatigue or learning effects do not influence performance. The maximum throwing distance will be determined using a flexible steel tape. Only the best attempt will be used for further analysis (24).

Modified Bruce Treadmill Test - This sub-maximal test with incremental protocol including seven stages and performed on a treadmill, standard an open-circuit spirometer technique (Cosmed K5b2, Cosmed, Rome, Italy) will be used.

The knee extensors and flexors will be evaluated using an isokinetic dynamometer (Biodex System 2, USA) at two different angular velocities: 60°/s and 180°/s (22).

The Stroop Color and Word Test (parameters: words, colors, and words/colors) will be selected to assess response inhibition/cognitive flexibility (14).

Digit Symbol Substitution Test (DSST, subtest of the Wechsler test of adult intelligence WAIS III) (16, 17) will be used as a measure of high-level information processing speed.

Selective recall test [SRT-List A; parameters: consistent long-term recall, long-term storage, delayed recall, and intrusions] to assess verbal learning and multiple-trial memory (14).

The forward digit advancement (DS) test was selected to assess verbal short-term memory and the backward DS to assess verbal working memory (subtest of the Wechsler test of intelligence for adults WAIS III) and total DS score (total DS; calculated by adding forward DS and backward DS) (14, 16).

Consortium to establish a registry for the Alzheimer's Disease List Test (CERAD), will be used: word list memory; word list recall; and word list recognition. The parameters: total hits and delayed recall hits (13, 14).

The geriatric depression scale (GDS, short version) (18) will be used for depressive symptoms assessment. The GDS-15 evaluates depressive symptoms during the last week and has a dichotomous response scale (Yes/No). On 10 items (2, 3, 4, 6, 8, 9, 10, 12, 14, 15) the answer Yes is rated 1 point and on the remaining items (1, 5, 7, 11, and 13) the answer No is rated 1 point, in the sense that the score indicates presence of depressive symptomatology. The total score of the items is processed by summing the scores on the 15 items, ranging from 0 to 15 points. The 15-item version of the GDS showed the ability to differentiate depressed from nondepressed subjects (18).

Hospital Anxiety and Depression Scale (HADS) will be used (19). Although the HADS is considered an effective instrument for assessing depressive symptoms in hospital settings, it is a screening measure, and it is of utmost importance to be followed by a psychological assessment. This scale consists of two subscales, one for anxiety and the other for depression. A score between 0 to 7 means absence of depressive or anxious symptoms; a score between 8 to 10 means a possible case of depression or anxiety; and from 11 to 21 as a probable case.

Perceived Stress Scale (PSS-10) (20) will be used to assess perceived stress.

Risk of falls will be evaluated through the Biodex® Balance System (Biodex, Shirley, NY, EUA), using the Fall Risk Test protocol in which the platform is unstable and allows to obtain the risk index and modified version of the Clinical Test of Sensory Interaction and Balance (CTSIB).

The handgrip strength will be measured with a Jamar Plus + Digital hand dynamometer (Sammons Preston Inc., Bolingbrook, Illinois, USA). Measurements will be carried out following the American Society of Hand Therapists recommendations, and each participant will perform three attempts with a pause of 1 min between them. Three attempts will be made for each hand, using the maximum value of the three registers.

This will be analyzed using an electromyography (EEG) system. All EEG signals will be acquired with the ActiCHamp®, Brain Products,GmbH. With an international 10-20 system with standard 32-channel electrode layout with reference and ground electrodes. The ground will be located on the forehead and the reference will be the Cz channel of the ActiCHamp® equipment. For each participant, the same equipment will be used in all sessions.

Physical-functional fitness is going to be measured via the Senior Fitness Test (SFT) (23). This physical battery includes lower and upper-body strength (30-second chair stand and 30-second arm curl tests, respectively), agility/dynamic balance (8-foot up-and-go test), aerobic endurance (six-minute walk test) and lower and upper-body flexibility (chair sit-and-reach and back scratch tests, respectively).

The chair stand test to assess the strength of the lower body, counting the number of repetitions made in 30s. And the arm curl test to assess the strength on the upper body, using a 3lb (women) and 5lb (men) dumbbell, counting the number of repetitions made in 30s.

Physical-functional fitness is going to be measured via the Senior Fitness Test (SFT) (23). This physical battery includes lower and upper-body strength (30-second chair stand and 30-second arm curl tests, respectively), agility/dynamic balance (8-foot up-and-go test), aerobic endurance (six-minute walk test) and lower and upper-body flexibility (chair sit-and-reach and back scratch tests, respectively).

The stand up, walk 8-foot distance (2,44 meters), turn the cone marker around and return to the seated position. The time, in seconds, necessary to complete this test will be registered.

Physical-functional fitness is going to be measured via the Senior Fitness Test (SFT) (23). This physical battery includes lower and upper-body strength (30-second chair stand and 30-second arm curl tests, respectively), agility/dynamic balance (8-foot up-and-go test), aerobic endurance (six-minute walk test) and lower and upper-body flexibility (chair sit-and-reach and back scratch tests, respectively). The participants will be asked to walk the longer distance in 6 min time along a corredor.

Physical-functional fitness is going to be measured via the Senior Fitness Test (SFT) (23). This physical battery includes lower and upper-body strength (30-second chair stand and 30-second arm curl tests, respectively), agility/dynamic balance (8-foot up-and-go test), aerobic endurance (six-minute walk test) and lower and upper-body flexibility (chair sit-and-reach and back scratch tests, respectively). The chair sit & reach test to assess the flexibility of the lower body, measured in cm. And the back scratch test to assess flexibility on the upper body, measured in cm.

Age (years), academic level (primary, secondary, bachelor, master, PhD), civil status (married, separated, widow, single, others), number of medications, diagnosed diseases, falls in the last 12 months.

Quality of life will be tested with the World Health Organization Quality of Life Assessment Tool (WHOQOL-Bref).

Appendicular Skeletal Muscle Mass Index (ASMI), which is the sum of muscle masses of the four limbs described as appendicular skeletal muscle mass adjusted for height (kg/m2), will be analyzed with Dual Energy X-ray Absorptiometry (DXA).

Will be tested with the physical activity enjoyment scale (PACES) (26). The Portuguese version of the PACES is a validated and reliable instrument to assess enjoyment in group fitness activities. This scale is composed of eight items (e.g., "It is invigorating") preceded by the statement "The physical activity I practice..." to which participants respond through a Likert-type scale with a minimum score of 1 "totally disagree" and maximum score of 7 ("totally agree").

Body mass (kg), fat-free mass (kg) and fat mass (kg) will be analyzed with bioimpedance (InBody 120®).

They will be analyzed by Dual Energy X-ray Absorptiometry (DXA).

Caloric intake will be evaluated by a 4-day food record. Macronutrients (i.e., carbohydrate, protein, and fat) will be analyzed as a percentage of total calories consumed.

Borg Rating of Perceived Exertion

Adverse events, discomfort or chest pain during training will be measured with the Borg Category ratio scale (CR-10).

Daily physical activity will be collected with the activity monitors GT3X+ (ActiGraph). Devices are going to be placed on participant´s waist, to measure the activity intensity (counts per minute) during one week. Is addition, physical activity will be also self reported with the IPAQ short version (IPAQ-SV) on the 4 moments of evaluations