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https://doi.org/10.5812/numonthly.37443

Sarcopenia and Physical Inactivity in Patients With Chronic Kidney Disease

Author(s):
Keiji HiraiKeiji Hirai1, Susumu OokawaraSusumu Ookawara1, Yoshiyuki MorishitaYoshiyuki Morishita1,*
1Division of Nephrology, First Department of Integrated Medicine, Saitama Medical Center, Jichi Medical University, Saitama, Japan

Nephro-Urology Monthly:Vol. 8, issue 3; e37443
Published online:Apr 26, 2016
Article type:Review Article
Received:Feb 27, 2016
Accepted:Apr 01, 2016
How to Cite:Keiji HiraiSusumu OokawaraYoshiyuki MorishitaSarcopenia and Physical Inactivity in Patients With Chronic Kidney Disease.Nephro-Urol Mon.2016;8(3):e37443.https://doi.org/10.5812/numonthly.37443.

Abstract

Keywords
Sarcopenia
Physical Inactivity
Chronic Kidney Disease

1. Context

Sarcopenia is characterized by the loss of skeletal muscle, which is defined by decreased muscle mass and strength (1). Sarcopenia often is observed in patients with chronic kidney disease (CKD) (2). The prevalence of sarcopenia increases in line with the progression of the stages of CKD (2).

Various pathological conditions are associated with CKD, including accumulation of uremic toxins, chronic inflammation, insulin resistance, hormonal imbalance, malnutrition, vitamin D deficiency, inadequate oxygen transport as a consequence of anemia, metabolic acidosis, electrolyte disorder, and a protein-restricted diet. These pathological conditions all can contribute to the progression of sarcopenia and increased physical inactivity in CKD patients (2-7).

Sarcopenia induces physical inactivity through the loss of skeletal muscle, which in turn induces the loss of physical functions, and increased physical inactivity accelerates the progression of sarcopenia (8-10) (Figure 1). Consequently, sarcopenia and physical inactivity synergistically progress. Recent clinical studies show that both sarcopenia and physical inactivity have an association with increased mortality in CKD patients. Prevention and mitigation of the progression of sarcopenia and physical inactivity are important to improve the prognosis of CKD patients.

The Flow Diagram of This Systemic Review
Figure 1.

The Flow Diagram of This Systemic Review

This review examines those clinical studies that have investigated the associations between sarcopenia, physical inactivity, and mortality and looks at strategies to prevent and improve sarcopenia and physical inactivity in CKD patients.

2. Evidence Acquisition

We systematically searched for clinical studies published in the English language in the MEDLINE (from 2000 to 2015). For this search, we used the following terms in various combinations: physical activity, exercise, muscle, sarcopenia, chronic kidney disease, dialysis, mortality, prognosis, and survival. We included cohort studies and randomized control trials that investigated the associations between sarcopenia, physical activity, and mortality in patients with chronic kidney disease.

3. Results

Computer and manual searches resulted in 1690 publications, of which 46 eligible articles were identified (Figure 1). Twenty-four articles were excluded because they did not meet the outcome assessment. Subsequently, five of these articles were excluded because two assessed muscle volume by midarm muscle circumference, which is not included in the definition of sarcopenia, and three articles included specific populations, such as patients with obesity, diabetes mellitus, and a low-protein diet. Thus, 17 articles were included in reference to the association between sarcopenia and physical inactivity, and mortality in CKD patients in this review. Furthermore, we discuss the therapeutic strategies to improve sarcopenia and physical inactivity in CKD patients.

3.1. Association Between Sarcopenia and Mortality in CKD Patients

Studies that have reported an association between sarcopenia and mortality in CKD patients at the pre-dialysis stage and those patients on hemodialysis are summarized in Table 1.

Table 1. Studies that Investigated the Association Between Sarcopenia and Mortality in CKD Patients
ReferencesYearPatients No.Study DesignDuration of StudyResults
CKD Patients at Pre-Dialysis
Chang et al. (11)2011128Prospective observational study2.8 yearsReduced hand grip strength was an independent predictor of mortality and progression to ESRD (HR: 4.55, 95% CI: 1.49 - 13.87 in men; HR: 4.56, 95% CI: 1.27 - 16.41 in women).
Roshanravan et al. (12)2013385Prospective observational study3 yearsWalking speed < 0.8 m/s was associated with all-cause mortality (HR: 2.45, 95% CI: 1.09 - 5.54).
Pereira et al. (13)2015287Prospective observational study3.3 yearsSarcopenia, defined as low skeletal muscle mass index and reduced hand grip strength, was an independent predictor of mortality (HR: 3.02, 95% CI: 1.30 - 7.05).
Patients on Hemodialysis
Carrero et al. (14)2008221Prospective observational study6 yearsModerate to severe muscle atrophy was associated with increased mortality (HR: 3.04, 95% CI: 1.61 - 5.71).
Kohl et al. (15)201252Prospective observational study12 yearsDistance walked in the 6MWT was a survival predictor (HR: 0.53, 95% CI: 0.37 - 0.74 for each 100 meters walked with a 100-meter increment).
Matsuzawa et al. (16)2014190Prospective observational study7 yearsKnee extensor strength of < 40% was associated strongly with increased mortality risk (HR: 2.73, 95% CI: 1.14–6.52).
Isoyama et al. (17)2014330Prospective observational study5 yearsSarcopenia, defined as low muscle mass and reduced hand grip strength, showed increased mortality risk (HR: 1.93, 95% CI: 1.01 - 3.71).
Kutner et al. (18)2015752Prospective observational study3.3 yearsWalk speed < 0.6 m/s was associated with increased mortality risk (HR: 2.17, 95% CI: 1.19 - 3.98).
Hemodialysis+ Peritoneal Dialysis
Torino et al. (19)2014296Secondary analysis of randomized controlled trial3.3 yearsA 20-meter increase in walking during the 6MWT reduced the risk of all-cause death (HR: 0.89, 95% CI: 0.84 - 0.94).

Studies that Investigated the Association Between Sarcopenia and Mortality in CKD Patients

3.1.1. CKD Patients at the Pre-Dialysis Stage

The prevalence of sarcopenia was reported to increase in line with the progression of the CKD stages (2). The prevalence of sarcopenia for each CKD stage was reported to be 4.3% for normal renal function (estimated glomerular filtration rate [eGFR] ≥ 90 mL/minute/ 1.73 m2) and CKD Stage 1 (eGFR 60 - 89 mL/minute/ 1.73 m2), 6.3% for CKD Stage 2 (eGFR 60 - 89 mL/minute/ 1.73 m2) and 15.4% for CKD Stages 3 - 5 (< 60 mL/minute/ 1.73 m2). Sarcopenia was found to be a predictor of mortality in CKD patients (2). Several studies have reported that sarcopenia, as evaluated by loss of muscle mass and decreased gait speed and hand grip strength, increased mortality risk in CKD patients at the pre-dialysis stage (11-13). Renal outcome also was found to be associated negatively with sarcopenia in this population (11).

These findings suggest that sarcopenia should be evaluated carefully and that prevention and mitigation of the progression of sarcopenia and physical inactivity are important to improve the prognosis of CKD patients.

3.1.2. Hemodialysis Patients

The prevalence of sarcopenia in hemodialysis patients is higher than in CKD patients at the pre-dialysis stage. In elderly hemodialysis patients, the prevalence of sarcopenia increases up to 45% - 63% (20).

In addition to those factors observed in CKD patients at the pre-dialysis stage, loss of amino acids and albumin into the dialysate, systemic inflammation induced by contact with artificial substances, such as the dialysis membrane and circuits, and decreased physical activity due to bed rest during dialysis also contribute to the progression of sarcopenia in hemodialysis patients (2-6).

We previously reported that sarcopenia progressed in accordance with duration on hemodialysis even after adjustment for age and sex (21). Sarcopenia is a strong predictor of mortality in hemodialysis patients as well as in CKD patients at the pre-dialysis stage (14-19).

Several studies have reported an association between sarcopenia and mortality in hemodialysis patients (14-19). Sarcopenia, as estimated by low muscle mass, slow gait speed, and low hand grip strength, was found to increase mortality risk in hemodialysis patients (14-19). Muscle quality, calculated using hand grip strength divided by arm lean mass, also was reported to be an independent predictor of survival in hemodialysis patients (22).

These findings suggest that sarcopenia is an important condition that determines the prognosis of hemodialysis patients.

3.2. Association Between Physical Inactivity and Mortality in CKD Patients

Studies that have investigated the association between physical inactivity and mortality in CKD patients at the pre-dialysis stage and those patients on hemodialysis are summarized in Table 2.

Table 2. Studies that Investigated the Association Between Physical Activity and Mortality in CKD Patients
ReferencesYearPatients No.Study DesignDuration of StudyResults
CKD Patients at Pre-Dialysis
Beddhu et al. (23)2009907Retrospective observational study7 yearsIncreased physical activity was associated with reduced mortality (HR: 0.58, 95% CI: 0.42 - 0.79 for insufficiently active group, and HR: 0.44, 95% CI: 0.33 - 0.58 for active group compared with physically inactive group).
Ricardo et al. (24)20132288Prospective observational study13 yearsRegular physical activity was associated with decreased mortality (HR: 0.80, 95% CI: 0.65 - 0.99).
Navaneethan et al. (25)20142153Prospective observational study4.5 yearsLow leisure time physical activity was associated with a higher risk of death (HR: 1.36, 95% CI: 1.003 - 1.85).
Chen et al. (26)20146363Prospective observational study2.5 yearsWalking was associated with lower risk for overall mortality (HR: 0.67, 95% CI: 0.53 - 0.84).
Patients on Hemodialysis
Tentori et al. (27)201020,920Prospective observational study/1.8 yearsMortality risk was lower among regular exercisers (HR: 0.73, 95% CI: 0.69 - 0.78).
Matsuzawa et al. (28)2012202Prospective observational study7 yearsEngaging in habitual physical activity was associated with decreased mortality risk (HR: 0.78, 95% CI: 0.66 - 0.92) per 10 min/day increase in physical activity.
Lopes et al. (29)20145763Prospective observational study2.5 yearsAerobic activity was associated inversely with mortality (HR: 0.60, 95% CI:0.47 - 0.77) for very active group compared with never/rarely active group.
Hemodialysis + Peritoneal Dialysis
O’Hare et al. (30)20032837Prospective observational study1 yearSedentary behavior was associated with an increased mortality risk (HR: 1.62, 95% CI: 1.16 - 2.27).

Studies that Investigated the Association Between Physical Activity and Mortality in CKD Patients

3.2.1. CKD Patients at the Pre-Dialysis Stage

CKD patients at the pre-dialysis stage often undertake less physical activity than the healthy population. A cross-sectional observational survey of 15,368 adults reported that physical inactivity rates, as determined by a questionnaire, were 28.0% for CKD patients and 13.5% for the non-CKD population (23). Another study reported that decreased renal function, estimated by eGFR, correlated with physical inactivity in CKD patients at the pre-dialysis stage (31).

Physical inactivity is a predictor of mortality in CKD patients at the pre-dialysis stage. Several studies have reported an association between physical inactivity and increased mortality risk in this population (23-25). Another study reported that walking habits were associated with mortality in patients in CKD stages 3 - 5 (26). In that study, increased walking was found to decrease overall mortality (26). A dose-dependent negative association was found between walking frequency (1 - 2, 3 - 4, 5 - 6 and ≥ 7 times per week) and hazard ratio of mortality (0.83, 0.72, 0.42, and 0.41) (26). That study also reported that increased walking inhibited decreased renal function and risk for induction of renal replacement therapy (26).

These findings suggest that increased physical activity may have beneficial effects on the prognosis of CKD patients at the pre-dialysis stage. CKD patients at the pre-dialysis stage should be encouraged to exercise to reduce mortality risk and reduce progression to end-stage renal diseases.

3.2.2. Hemodialysis Patients

A questionnaire survey examining the exercise habits of 20,920 hemodialysis patients found that 53.6% of these patients did not exercise at all or did so less than once per week (27). This sedentary behavior was observed more often in elder patients than in younger patients and more often in female patients than in male patients.

Several studies have reported that physical inactivity increases mortality risk in hemodialysis patients (27-30). Exercise, such as walking, was found to decrease mortality risk in hemodialysis patients (27). A dose-dependent negative association was found between walking frequency (1, 2 - 3, 4 - 5, and 6 - 7 times per week) and hazard ratio of mortality (0.82, 0.73, 0.72, and 0.69) (27).

These findings suggest that increased physical activity may have beneficial effects on the prognosis of hemodialysis patients.

3.3. Therapeutic Strategies to Improve Sarcopenia and Physical Inactivity

3.3.1. Exercise Training

Numerous studies have reported that both aerobic and resistance exercise training improve sarcopenia (muscle mass and strength) and physical inactivity in CKD patients at the pre-dialysis stage and in hemodialysis patients (32-40) (Table 3). Exercise training increases muscle mass and strength and improves physical functions. A recent meta-analysis reported that any type of regular exercise training is effective in improving exercise capacity, physical functions, and muscle mass and strength in all CKD patients (41). The American College of Sports Medicine guidelines recommend that CKD patients at the pre-dialysis stage and hemodialysis patients perform aerobic exercise training at mild-moderate levels for 20 - 60 minute/day, 3 - 5 days/week. The guidelines also recommend resistance exercise training for these patients, at 70% - 75% of one repetition maximum for a minimum one set of 10 - 15 repetitions, 2 - 3 days/week (42). kidney disease: improving global outcomes 2012’s clinical practice guidelines recommend regular exercise for at least 30 minutes, five times per week to prevent muscle loss and maintain physical activity in CKD patients (43). Cochrane collaboration guidelines also recommend that 30 minutes of exercise training three days/week can improve physical fitness, resulting in an improved health-related quality of life in hemodialysis patients (44).

Table 3. Studies that Investigated the Effects of Exercise Training on Sarcopenia (Muscle Mass and Strength) and Physical Function in CKD Patients
ReferencesYearPatients No. (Exercise)Patients No. (Control)StudyDuration of StudyExercise TrainingResults
CKD Patients at Pre-Dialysis
Rossi et al. (32)20145948RCT12 weeksWeight training and treadmill: 2 times/week.Improved 6-min walk distance (P < 0.001).
Watson et al. (33)20152114RCT8 weeksProgressive resistance exercise: 3 times/week.Increased rectus femoris anatomical cross-sectional area (P = 0.006), volume (P = 0.009), and knee extensor strength (P < 0.001).
Patients on Hemodialysis
DePaul et al. (34)20022018RCT12 weeksResisted isotonic quadriceps and hamstring exercises and ergometer: 3 times/week.Improved hamstring and quadriceps muscle strength (P = 0.02).
Castaneda et al. (35)20041412RCT12 weeksResistance training: 45 min, 3 times/week.Improved muscle strength (P = 0.001).
van Vilsteren et al. (36)20055343RCT12 weeksCycling during dialysis, together with pre-dialysis strength training: 2 - 3 times/week.Increased lower extremity muscle strength (P < 0.05).
Cheema et al. (37)20072425RCT12 weeksHigh-intensity, progressive resistance training during routine hemodialysis treatment.Improved muscle strength (P = 0.002), midthigh circumference (P = 0.04) and midarm circumference (P = 0.004).
Kirkman et al. (38)20141211RCT12 weeksResistance training: 3 times/week during hemodialysis sessions.Increased thigh muscle volume (P = 0.007) and knee extensor strength (P = 0.012)
Matsufuji et al. (39)20151215RCT12 weeksChair stand exercise 3 sessions/week.Increased thigh circumference (p < 0.05).
Howden et al. (40)20153636RCT48 weeksAerobic and resistance exercise 150 minutes/week.Improved grip strength (P = 0.03) and 6-minutes’ walk distance (P < 0.001).

Studies that Investigated the Effects of Exercise Training on Sarcopenia (Muscle Mass and Strength) and Physical Function in CKD Patients

3.3.2. Essential Amino Acid Supplement

Essential amino acids are necessary for protein synthesis and maintenance and repair of muscle tissue. Inadequate amino acid intake often can be observed in CKD patients because of their protein-restricted diet (45). In addition, 6 - 8 g of amino acids can be lost into the dialysate during each hemodialysis session (46).

A prospective observational study reported that dietary protein intake of less than 1.2 g/kg/day is an independent predictor of mortality in hemodialysis patients (47). The international society of renal nutrition and metabolism’s consensus statement recommends oral nutritional supplements, including essential amino acids, be taken by CKD patients at the pre-dialysis stage with a dietary protein intake of less than 0.7 g/kg/day and by hemodialysis patients with a dietary protein intake of less than 1.2 g/kg/day (48). Oral administration of 3.6 g of essential amino acids three times per day with meals was reported to improve hand grip strength significantly in hemodialysis patients with hypoalbuminemia, compared with a placebo group (49).

These findings suggest that essential amino acid supplementation may be considered for CKD patients with an inadequate dietary protein intake and with hypoalbuminemia to prevent sarcopenia, resulting in an improved prognosis.

3.3.3. Vitamin D Supplement

The vitamin D receptor is expressed in muscle tissue, and its activation promotes de novo protein synthesis in muscle (50).

The serum 25-hydroxy vitamin D (25-OHD) level was reported to be associated positively with muscle strength of the lower extremities, estimated using a micro manual muscle tester, in hemodialysis patients (51). Supplementation of 25-OHD was found to improve physical performance significantly, evaluated by the timed up and go test, gait velocity test, the timed chair stand test, and the stair climb test, in CKD patients at the pre-dialysis stage and hemodialysis patients who had vitamin D deficiency (a serum 25-OHD level less than 50 nmol/L) (52).

These findings suggest that 25-OHD supplementation is important to prevent sarcopenia and physical inactivity in CKD patients and that it may be considered for CKD patients who have a vitamin D deficiency.

4. Conclusions

Various pathological conditions associated with CKD can contribute to the progression of sarcopenia and increased physical inactivity in CKD patients (Figure 2). Sarcopenia and physical inactivity are associated strongly with an increased mortality risk in CKD patients. Therapeutic strategies, including exercise training and essential amino acid and vitamin D supplementation, may improve sarcopenia and physical inactivity. This may result in an improved prognosis for CKD patients.

Sarcopenia and physical inactivity synergistically progress. Abbreviations: CKD, chronic kidney disease.
Figure 2.

Sarcopenia and physical inactivity synergistically progress. Abbreviations: CKD, chronic kidney disease.

Acknowledgments

Footnotes

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