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Progressive resistance training (PRT) and neuromuscular exercise (NEMEX) programs result in similar improvements in hip function, pain, and hip-related quality of life (QOL) in people with osteoarthritis (OA), according to the results of a randomized controlled trial.
At the end of the 12-week exercise period, both interventions yielded changes from baseline on the 30-second chair stand test (30s-CST) that were below the threshold for a major clinical effect.
Mean changes in the Hip Disability and Osteoarthritis Outcome Score (HOOS) pain subscale and HOOS QOL score were also similar among the participants, regardless of which exercise program they had been assigned to.
“The lack of superiority of PRT for increasing muscle strength and power is surprising given the principle of specificity (higher-intensity resistance training yields greater improvements in maximal muscle strength),” according to the Danish researchers who reported the results online today in Annals of Internal Medicine.
“However, the point estimates only showed modest and uncertain superiority of PRT for increasing muscle strength and power and no differences for any functional performance tests or self-reported physical function,” they added.
The Power of Exercise
Worldwide, most clinical guidelines recommend exercise as a first-line conservative treatment option in both hip and knee OA. However, there is not much evidence to help guide healthcare practitioners in deciding which type of exercises to use with their patients, Troels Kjeldsen, MSc, the principal investigator for the study, told this news organization.
“Neuromuscular exercise is a very commonly used exercise program in clinical practice, but, to our knowledge, it has never been compared to another type of exercise in hip OA,” observed Mr. Kjeldsen, who is a PhD student in the department of orthopedic surgery at Aarhus University Hospital, Aarhus, Denmark.
“Each year, many thousands of patients are referred to having neuromuscular exercise therapy with a physiotherapist,” Mr. Kjeldsen said. “So, we thought it would be worthwhile to compare it to PRT, another promising exercise type, to see if it really did perform as well as I think most people thought it did,” he added.
Comparing the Two Exercise Programs
PRT and NEMEX are two different types of exercise programs. PRT involves using resistance-training machines, and the focus is to maximize the exercise intensity by using as high an exercise load or weight as possible. By contrast, NEMEX consists of exercises that are low to moderate in intensity and emphasizes alignment, control, and stability of the movements.
To compare the two exercise strategies, Mr. Kjeldsen and fellow investigators recruited 160 participants at five hospitals and 10 physiotherapy clinics across three of five healthcare regions in Denmark.
For inclusion in the trial, the participants had to have a clinical diagnosis of hip OA, be older than 45 years, and experience pain during activity in one or both hips that was rated as 3 or higher on a 10-point numerical rating scale. Participants also had to have no or less than 30 minutes of hip joint stiffness in the morning as well as no surgery involving the lower extremities in the previous 6 months.
Participants were then randomized to undertake the PRT (n = 82) or NEMEX (n = 78) program, delivered as two physiotherapist-led group sessions every week for 12 weeks. Exercise sessions were held at least 72 hours apart and consisted of a 10-minute warm-up on an exercise bike and then 50 minutes of PRT or NEMEX. PRT consisted of five generic resistance-based exercises targeting hip and knee joint muscles and NEMEX consisted of 10 exercises that increased in difficulty by varying the number, direction, speed, and surface of the movements performed.
Dead Heat Between PRT and NEMEX
The primary endpoint was the 30s-CST, which counted the number of times participants could stand from a seated position in 30 seconds. Participants in the PRT and NEMEX groups were able to do this maneuver a respective 11.3 and 11.6 times at baseline and 12.8 and 13.1 times after completion of the exercise programs.
Other functional performance tests included a 40-m fast-paced walk, a nine-step timed stair climb, leg extensor power in the affected and unaffected limb, and a unilateral single repetition leg press. None of these showed a statistically significant benefit of PRT over NEMEX, or vice versa.
HOOS pain scores at baseline and 12 weeks for PRT were a respective 57.5 and 66.1, representing an overall 8.6-point increase, and for NEMEX they were 58.9 and 68.2, giving a 9.3-point increase, meaning there was only a -0.7 mean change when comparing the two groups.
Corresponding baseline and 12-week HOOS QOL scores for PRT were 43.7 and 51.7; for NEMEX, they were 47.1 and 52.8 thus giving 8.0- and 5.7-point increases and a 2.3 difference in change between the groups. Again, this wasn’t quite enough to show a clinically meaningful effect.
Future Steps
“The effect of exercise seems to be at its highest at 3-4 months when you implement exercise, so we compared the effects of the exercises at the time when they are probably going to be at their highest,” Mr. Kjeldsen explained. He said the research team also plans to look at what happens after 1 year of follow-up.
“The key take home message is that patients can be encouraged to pick the type of exercise that they find the most enjoyable, or the type that is available to them,” Mr. Kjeldsen suggested.
Stephanie Chang, MD, MPH, who is the Deputy Editor of Annals of Internal Medicine and practices in Rockville, Maryland, commented on the paper to this news organization. “In this small study, we learned that exercises to strengthen lower extremity muscles did not improve pain or function any more than exercises for core stability and balance,” she said.
Dr. Chang pointed out that there was variance in the levels of activity that people already undertook at baseline: 40% of the PRT group and 41% of the NEMEX group already did 150 minutes or more of moderate intensity physical activity.
“It’s possible that benefit or differences between interventions would be greater in people with different levels of baseline activity or even in those with different osteoarthritis severity,” she said.
“In the meantime,” Dr. Chang added, “with the findings from this study, I would feel comfortable advising my patients with hip osteoarthritis to engage in whichever type of exercise they prefer — whether that exercise focuses on core strengthening and balance or on specific lower extremity muscle strengthening.”
The trial was funded by the Independent Research Fund Denmark, the Physiotherapy Practice Foundation, the Health Foundation, Aarhus University, Region Zealand, the Association of Danish Physiotherapists, Andelsfonden, and Hede Nielsens Family Foundation. Mr. Kjeldsen and Dr. Chang report no relevant financial relationships.
A version of this article appeared on Medscape.com.
Progressive resistance training (PRT) and neuromuscular exercise (NEMEX) programs result in similar improvements in hip function, pain, and hip-related quality of life (QOL) in people with osteoarthritis (OA), according to the results of a randomized controlled trial.
At the end of the 12-week exercise period, both interventions yielded changes from baseline on the 30-second chair stand test (30s-CST) that were below the threshold for a major clinical effect.
Mean changes in the Hip Disability and Osteoarthritis Outcome Score (HOOS) pain subscale and HOOS QOL score were also similar among the participants, regardless of which exercise program they had been assigned to.
“The lack of superiority of PRT for increasing muscle strength and power is surprising given the principle of specificity (higher-intensity resistance training yields greater improvements in maximal muscle strength),” according to the Danish researchers who reported the results online today in Annals of Internal Medicine.
“However, the point estimates only showed modest and uncertain superiority of PRT for increasing muscle strength and power and no differences for any functional performance tests or self-reported physical function,” they added.
The Power of Exercise
Worldwide, most clinical guidelines recommend exercise as a first-line conservative treatment option in both hip and knee OA. However, there is not much evidence to help guide healthcare practitioners in deciding which type of exercises to use with their patients, Troels Kjeldsen, MSc, the principal investigator for the study, told this news organization.
“Neuromuscular exercise is a very commonly used exercise program in clinical practice, but, to our knowledge, it has never been compared to another type of exercise in hip OA,” observed Mr. Kjeldsen, who is a PhD student in the department of orthopedic surgery at Aarhus University Hospital, Aarhus, Denmark.
“Each year, many thousands of patients are referred to having neuromuscular exercise therapy with a physiotherapist,” Mr. Kjeldsen said. “So, we thought it would be worthwhile to compare it to PRT, another promising exercise type, to see if it really did perform as well as I think most people thought it did,” he added.
Comparing the Two Exercise Programs
PRT and NEMEX are two different types of exercise programs. PRT involves using resistance-training machines, and the focus is to maximize the exercise intensity by using as high an exercise load or weight as possible. By contrast, NEMEX consists of exercises that are low to moderate in intensity and emphasizes alignment, control, and stability of the movements.
To compare the two exercise strategies, Mr. Kjeldsen and fellow investigators recruited 160 participants at five hospitals and 10 physiotherapy clinics across three of five healthcare regions in Denmark.
For inclusion in the trial, the participants had to have a clinical diagnosis of hip OA, be older than 45 years, and experience pain during activity in one or both hips that was rated as 3 or higher on a 10-point numerical rating scale. Participants also had to have no or less than 30 minutes of hip joint stiffness in the morning as well as no surgery involving the lower extremities in the previous 6 months.
Participants were then randomized to undertake the PRT (n = 82) or NEMEX (n = 78) program, delivered as two physiotherapist-led group sessions every week for 12 weeks. Exercise sessions were held at least 72 hours apart and consisted of a 10-minute warm-up on an exercise bike and then 50 minutes of PRT or NEMEX. PRT consisted of five generic resistance-based exercises targeting hip and knee joint muscles and NEMEX consisted of 10 exercises that increased in difficulty by varying the number, direction, speed, and surface of the movements performed.
Dead Heat Between PRT and NEMEX
The primary endpoint was the 30s-CST, which counted the number of times participants could stand from a seated position in 30 seconds. Participants in the PRT and NEMEX groups were able to do this maneuver a respective 11.3 and 11.6 times at baseline and 12.8 and 13.1 times after completion of the exercise programs.
Other functional performance tests included a 40-m fast-paced walk, a nine-step timed stair climb, leg extensor power in the affected and unaffected limb, and a unilateral single repetition leg press. None of these showed a statistically significant benefit of PRT over NEMEX, or vice versa.
HOOS pain scores at baseline and 12 weeks for PRT were a respective 57.5 and 66.1, representing an overall 8.6-point increase, and for NEMEX they were 58.9 and 68.2, giving a 9.3-point increase, meaning there was only a -0.7 mean change when comparing the two groups.
Corresponding baseline and 12-week HOOS QOL scores for PRT were 43.7 and 51.7; for NEMEX, they were 47.1 and 52.8 thus giving 8.0- and 5.7-point increases and a 2.3 difference in change between the groups. Again, this wasn’t quite enough to show a clinically meaningful effect.
Future Steps
“The effect of exercise seems to be at its highest at 3-4 months when you implement exercise, so we compared the effects of the exercises at the time when they are probably going to be at their highest,” Mr. Kjeldsen explained. He said the research team also plans to look at what happens after 1 year of follow-up.
“The key take home message is that patients can be encouraged to pick the type of exercise that they find the most enjoyable, or the type that is available to them,” Mr. Kjeldsen suggested.
Stephanie Chang, MD, MPH, who is the Deputy Editor of Annals of Internal Medicine and practices in Rockville, Maryland, commented on the paper to this news organization. “In this small study, we learned that exercises to strengthen lower extremity muscles did not improve pain or function any more than exercises for core stability and balance,” she said.
Dr. Chang pointed out that there was variance in the levels of activity that people already undertook at baseline: 40% of the PRT group and 41% of the NEMEX group already did 150 minutes or more of moderate intensity physical activity.
“It’s possible that benefit or differences between interventions would be greater in people with different levels of baseline activity or even in those with different osteoarthritis severity,” she said.
“In the meantime,” Dr. Chang added, “with the findings from this study, I would feel comfortable advising my patients with hip osteoarthritis to engage in whichever type of exercise they prefer — whether that exercise focuses on core strengthening and balance or on specific lower extremity muscle strengthening.”
The trial was funded by the Independent Research Fund Denmark, the Physiotherapy Practice Foundation, the Health Foundation, Aarhus University, Region Zealand, the Association of Danish Physiotherapists, Andelsfonden, and Hede Nielsens Family Foundation. Mr. Kjeldsen and Dr. Chang report no relevant financial relationships.
A version of this article appeared on Medscape.com.
Progressive resistance training (PRT) and neuromuscular exercise (NEMEX) programs result in similar improvements in hip function, pain, and hip-related quality of life (QOL) in people with osteoarthritis (OA), according to the results of a randomized controlled trial.
At the end of the 12-week exercise period, both interventions yielded changes from baseline on the 30-second chair stand test (30s-CST) that were below the threshold for a major clinical effect.
Mean changes in the Hip Disability and Osteoarthritis Outcome Score (HOOS) pain subscale and HOOS QOL score were also similar among the participants, regardless of which exercise program they had been assigned to.
“The lack of superiority of PRT for increasing muscle strength and power is surprising given the principle of specificity (higher-intensity resistance training yields greater improvements in maximal muscle strength),” according to the Danish researchers who reported the results online today in Annals of Internal Medicine.
“However, the point estimates only showed modest and uncertain superiority of PRT for increasing muscle strength and power and no differences for any functional performance tests or self-reported physical function,” they added.
The Power of Exercise
Worldwide, most clinical guidelines recommend exercise as a first-line conservative treatment option in both hip and knee OA. However, there is not much evidence to help guide healthcare practitioners in deciding which type of exercises to use with their patients, Troels Kjeldsen, MSc, the principal investigator for the study, told this news organization.
“Neuromuscular exercise is a very commonly used exercise program in clinical practice, but, to our knowledge, it has never been compared to another type of exercise in hip OA,” observed Mr. Kjeldsen, who is a PhD student in the department of orthopedic surgery at Aarhus University Hospital, Aarhus, Denmark.
“Each year, many thousands of patients are referred to having neuromuscular exercise therapy with a physiotherapist,” Mr. Kjeldsen said. “So, we thought it would be worthwhile to compare it to PRT, another promising exercise type, to see if it really did perform as well as I think most people thought it did,” he added.
Comparing the Two Exercise Programs
PRT and NEMEX are two different types of exercise programs. PRT involves using resistance-training machines, and the focus is to maximize the exercise intensity by using as high an exercise load or weight as possible. By contrast, NEMEX consists of exercises that are low to moderate in intensity and emphasizes alignment, control, and stability of the movements.
To compare the two exercise strategies, Mr. Kjeldsen and fellow investigators recruited 160 participants at five hospitals and 10 physiotherapy clinics across three of five healthcare regions in Denmark.
For inclusion in the trial, the participants had to have a clinical diagnosis of hip OA, be older than 45 years, and experience pain during activity in one or both hips that was rated as 3 or higher on a 10-point numerical rating scale. Participants also had to have no or less than 30 minutes of hip joint stiffness in the morning as well as no surgery involving the lower extremities in the previous 6 months.
Participants were then randomized to undertake the PRT (n = 82) or NEMEX (n = 78) program, delivered as two physiotherapist-led group sessions every week for 12 weeks. Exercise sessions were held at least 72 hours apart and consisted of a 10-minute warm-up on an exercise bike and then 50 minutes of PRT or NEMEX. PRT consisted of five generic resistance-based exercises targeting hip and knee joint muscles and NEMEX consisted of 10 exercises that increased in difficulty by varying the number, direction, speed, and surface of the movements performed.
Dead Heat Between PRT and NEMEX
The primary endpoint was the 30s-CST, which counted the number of times participants could stand from a seated position in 30 seconds. Participants in the PRT and NEMEX groups were able to do this maneuver a respective 11.3 and 11.6 times at baseline and 12.8 and 13.1 times after completion of the exercise programs.
Other functional performance tests included a 40-m fast-paced walk, a nine-step timed stair climb, leg extensor power in the affected and unaffected limb, and a unilateral single repetition leg press. None of these showed a statistically significant benefit of PRT over NEMEX, or vice versa.
HOOS pain scores at baseline and 12 weeks for PRT were a respective 57.5 and 66.1, representing an overall 8.6-point increase, and for NEMEX they were 58.9 and 68.2, giving a 9.3-point increase, meaning there was only a -0.7 mean change when comparing the two groups.
Corresponding baseline and 12-week HOOS QOL scores for PRT were 43.7 and 51.7; for NEMEX, they were 47.1 and 52.8 thus giving 8.0- and 5.7-point increases and a 2.3 difference in change between the groups. Again, this wasn’t quite enough to show a clinically meaningful effect.
Future Steps
“The effect of exercise seems to be at its highest at 3-4 months when you implement exercise, so we compared the effects of the exercises at the time when they are probably going to be at their highest,” Mr. Kjeldsen explained. He said the research team also plans to look at what happens after 1 year of follow-up.
“The key take home message is that patients can be encouraged to pick the type of exercise that they find the most enjoyable, or the type that is available to them,” Mr. Kjeldsen suggested.
Stephanie Chang, MD, MPH, who is the Deputy Editor of Annals of Internal Medicine and practices in Rockville, Maryland, commented on the paper to this news organization. “In this small study, we learned that exercises to strengthen lower extremity muscles did not improve pain or function any more than exercises for core stability and balance,” she said.
Dr. Chang pointed out that there was variance in the levels of activity that people already undertook at baseline: 40% of the PRT group and 41% of the NEMEX group already did 150 minutes or more of moderate intensity physical activity.
“It’s possible that benefit or differences between interventions would be greater in people with different levels of baseline activity or even in those with different osteoarthritis severity,” she said.
“In the meantime,” Dr. Chang added, “with the findings from this study, I would feel comfortable advising my patients with hip osteoarthritis to engage in whichever type of exercise they prefer — whether that exercise focuses on core strengthening and balance or on specific lower extremity muscle strengthening.”
The trial was funded by the Independent Research Fund Denmark, the Physiotherapy Practice Foundation, the Health Foundation, Aarhus University, Region Zealand, the Association of Danish Physiotherapists, Andelsfonden, and Hede Nielsens Family Foundation. Mr. Kjeldsen and Dr. Chang report no relevant financial relationships.
A version of this article appeared on Medscape.com.
FROM ANNALS OF INTERNAL MEDICINE