Cardiorespiratory Fitness
Conditions
Brief summary
This study is aiming to compare the CRF utilizing LIRT-BFR and MIRT in the elderly. Both techniques provided comparable gains in VO₂ max and the BORG scale. The BFR group displayed a greater level of safety for elderly to undertake resistance training with the same benefit as the MIRT group.
Detailed description
Decreased cardiorespiratory fitness (CRF) is a common issue among older adults and contributes to reduced physical activity levels and quality of life. While aerobic exercise is known to improve CRF, it has limited effects on muscle strength and mass. In contrast, resistance training can enhance both cardiorespiratory and muscular fitness when performed at moderate intensity. Blood flow restriction (BFR) applied during low-intensity resistance training (LIRT-BFR) has emerged as a promising alternative that may elicit similar physiological benefits to traditional moderate-intensity resistance training (MIRT) while reducing mechanical stress on joints and muscles. This study aims to compare the effects of six weeks of LIRT-BFR versus MIRT on cardiorespiratory fitness in elderly women. Twenty-eight participants were randomly assigned to either the LIRT-BFR group or the MIRT group and completed 12 supervised exercise sessions over six weeks. The MIRT group performed exercises at 40-60% of one-repetition maximum (1-RM), while the LIRT-BFR group exercised at 20-30% of 1-RM under blood flow restriction. The primary outcome was the predicted VO₂max obtained from the 6-Minute Walking Test (6MWT). The secondary outcome was the rating of perceived exertion (RPE) measured using the modified Borg scale following the 6MWT.
Interventions
OTHERLow Intensity Resistance Training and Blood Flow Resistance
The LIRT-BFR group used a cuff on the upper third of the thigh with a restriction pressure of 50 mmHg or 40% Arterial Occlusion Pressure to apply BFR while engaging in low-load resistance training that targeted the quadriceps femoris muscle at an intensity of 20-30% of 1-RM. The resistance training protocol consists of four sets of knee extensions using an ankle weight in a sitting position. Each set consists of 30 repetitions on the first set and 15 repetitions each on sets 2-4 with a 30-second interval between sets. The air pressure cuff was deflated during the interval period. In the third week, the weight load was recalculated to 40% of 1-RM in order to accommodate subsequent 1-RM testing procedures.
OTHERModerate Intensity Resistance Training
The MIRT group conducted three sets of moderate-intensity resistance training, concentrating on the quadriceps femoris muscle, with weights set at 40-60% of their 1RM or higher. While the MIRT protocol resembled that of LIRT-BFR, each set comprised 8-12 repetitions, followed by a 2-minute rest between sets. In the third week, the 1-RM testing protocol was revised, with the weight adjusted to 60% of the 1-RM.
Sponsors
Dr. Soetomo General Hospital
Study design
Allocation
RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
60 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Female aged ≥60 years who routinely performed aerobic exercise in RSUD Dr. Soetomo * Normal cognitive function (MoCA-Ina score ≥ 26) * Passed the screening questionnaire.
Exclusion criteria
* Severe physical disability (presented with a musculoskeletal, cardiorespiratory, or neurological disease that affected physical performance during exercise) * Visual and hearing impairment * Balance impairment * Blood clotting disorder * Peripheral arterial disease on the legs * Deep vein thrombosis * Neuropathy in the lower extremity * Uncontrolled hypertension or diabetes mellitus * Previous stroke and compartment syndrome * Knee osteoarthritis with moderate pain (VAS \>4) * Past vascular surgery * Prior skin graft on the lower leg area * Lower limb bone surgery within the past 12 weeks * Immobilization during the last 4 weeks * Statin consumption * Sarcopenia * Benign paroxysmal positional vertigo with an exacerbation in the previous 4 weeks.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| VO₂max | The VO₂max was measured before the intervention and after the intervention in the third and sixth weeks. The participants took a rest of at least 30 minutes after the resistance training to avoid fatigue in the legs, which could interfere with the 6MWD. | The main parameter evaluated in this study is cardiorespiratory fitness using VO₂max prediction value by carrying out a 6MWT. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| BORG RPE Scale | RPE was measured with the BORG Scale 6-20 to determine the participant's level of difficulty and exertion after the 6 MWT. The evaluation of RPE was continued for 60 minutes as guarantee the participant's safety and to monitor the complications. | The BORG RPE scale was used to measure a person's effort and exertion, dyspnea, and exhaustion during physical labor. RPE was measured with the BORG Scale 6-20 to determine the participant's level of difficulty and exertion after the 6 MWT. |
Countries
Indonesia
Outcome results
None listed