Incorporating Strength Training into our routine is a great way to build up our physical strength. Strength Training or resistance training is an important part of any fitness regime. It is the ability to perform a given set of exercises, with ease and comfort. These exercises are a combination of repetition and load. As an individual gets stronger, the repetition and load for an exercise can be increased. While recommending strength training your physiotherapist has to take care of the proper dosage. In older adults, it is difficult to properly dose strength training as there is a loss in muscle strength and power, which can lead to decreased function and increased fall risk. This article will discuss why proper dosage is important and how to properly dose strength training exercises in older adults.
In older adults, it is difficult to properly dose strength training to avoid any injury. Older adults exert considerably more effort to perform daily tasks. For example, to rise from a chair, a young individual works at 42% relative effort while an older adult works at 80% relative effort. We can increase that capacity through strength training and other forms of exercise so that older adults can function easily and comfortably.
Many older adults have pathologies like osteoporosis, arthritis, decreased tissue elasticity, and decreased recovery capacity. But still, older adults can safely perform and benefit from strength training. Even though there is a risk of causing adverse cardiac events in older adults. The physiotherapist designs programs specifically for complex patients so that these patients can exercise at a relatively high intensity, simultaneously monitoring their vital signs and symptoms.
To improve strength, we need to give training in the intensity range of 60-85% 1RM, with higher intensities resulting in greater strength gains. An intensity of 60% represents the minimum to get stronger, while the 70-85% range is optimal for strength adaptations.
1RM stands for one repetition maximum. It is the maximum amount of weight an individual can lift for a single repetition. In the same way, 2RM is the maximum amount of weight an individual can lift for two repetitions, 3RM is the maximum weight an individual can lift for three repetitions, and so on.
To test % 1RM, this can become time-consuming when performing various exercises,e.g., assessing % 1RM for a leg press, bench press, lunge, lat pull down, etc. Simultaneously, strength also fluctuates based on a variety of factors. Also, with rapid gain in the first weeks of training clients will get stronger over time, so the usually % 1RM will not always match the individual's abilities for a given session. Therefore, a target rep range can be used instead and RPE to achieve that intensity.
RPE stands for Rate of Perceived Exertion, which is the measure of exercise intensity, a scale designed for cardiovascular exercise. It gives an estimate of the actual heart rate during activity. To use it, multiply the RPE by 10 to get an estimated heart rate. For example, if RPE is 12, then 12 x 10 = 120 beats per minute.
The use of the OMNI Resistance Exercise Scale has been validated for use in older adults. This scale is explained and shown to older adults. During strength training aim should be to work in the range of 6-15 repetitions, loads that can be performed for 6 reps are approximately 85% 1RM, and loads that can be lifted for 15 reps are approximately 60% 1RM. Starting an individual with higher rep sets of 15 and over several weeks work down to lower rep sets of 6, if appropriate and tolerated.
Use RPE to make sure an individual is working in that 60-85% 1RM range. To assess RPE, ask the patient to rate their exertion level at the set’s end.
- An individual should not be pushed till absolute muscle failure. The patient should work up to an RPE of 6-8 ("somewhat hard" to "hard") within that 6-15 rep range, to ensure that enough load is applied to make the patient stronger.
- Some patients may start with greater than 15 reps and intensities of less than 6 RPE and that is ok if tolerated. Later. they should be progressed into the 6-15 rep range with RPEs of 6-8 to reach the 60-85% 1RM intensity that is optimal for strengthening.
- If an individual performs a given repetition and load combination for several weeks and the RPE increases or stays the same, this could mean that the client is not getting stronger by that exercise. In this case, it might be time to change the strength training program.
- To assess the progress an individual over time should be able to perform more reps with heavier loads, and with a similar level of RPE.