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Betalain-rich red beet concentrate improves reduced knee discomfort and joint function: a double blind, placebo-controlled pilot clinical study

Authors Pietrzkowski Z, Argumedo R, Shu C, Nemzer B, Wybraniec S, Reyes-Izquierdo T

Received 11 December 2013

Accepted for publication 15 January 2014

Published 10 March 2014 Volume 2014:6 Pages 9—13

DOI https://doi.org/10.2147/NDS.S59042

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 4

Zbigniew Pietrzkowski,1 Ruby Argumedo,1 Cynthia Shu,1 Boris Nemzer,2 Slawomir Wybraniec,3 Tania Reyes-Izquierdo1

1Applied BioClinical Inc., Irvine, CA, USA; 2FutureCeuticals Inc., Momence, IL, USA; 3Department of Analytical Chemistry, Institute C-1, Faculty of Chemical Engineering and Technology, Cracow University of Technology, Cracow, Poland

Aim: We aimed to evaluate the effect of a betalain-rich red beet concentrate (BRC) on joint discomfort and joint function.
Methods: Individuals with self-reported knee discomfort were randomized and blinded to treatment with either oral BRC (50 mg twice a day) or placebo. Symptoms of discomfort and joint function were assessed using the Western Ontario and McMaster Universities Arthritis Index (WOMAC) and the McGill Pain Questionnaire (MPQ) before treatment and after 5 and 10 days of treatment. The general level of energy was evaluated using a visual analog scale (VAS) at the same time points.
Results: In all, 40 individuals were evaluated in this study, 20 in the BRC group and 20 in the placebo group. The mean participant age was 55 years (range: 45–65). All participants completed the study. Individuals receiving BRC had a 27% better MPQ score after 10 days than did individuals in the placebo group (P=0.003). Furthermore, knee function, as measured by WOMAC score, was 26% better in the BRC group than in the placebo group (P<0.0013). Participants receiving BRC had a significantly better VAS score for energy after 5 (P=0.002) and 10 days (P=0.012) of treatment than did individuals receiving placebo.
Conclusion: Short-term use of BRC in individuals with knee discomfort significantly improved knee discomfort and joint function, as measured by WOMAC and MPQ scores, and energy, as measured by a VAS.

Keywords: arthritis, visual analog scale, Western Ontario and McMaster Universities Arthritis Index, McGill Pain Questionnaire, red beet roots

Introduction

Joint discomfort is a common complaint, typically associated with limited joint function, decreased feelings of energy, and decreased quality of life. There are numerous causes of joint discomfort, including osteoarthritis, trauma, rheumatoid arthritis, and gout. Joint discomfort is often associated with local inflammation, an increase in chlorinated peptides, and elevated levels of myeloperoxidase.1 An oxidative product of myeloperoxidase, hypochlorous acid, degrades articular cartilage, which may cause further joint discomfort.2

Current medical treatments aim at decreasing discomfort and increasing mobility. They generally include nonsteroidal anti-inflammatory drugs to control discomfort and inflammation. Unfortunately, chronic use of nonsteroidal anti-inflammatory drugs can lead to significant adverse effects, including gastrointestinal bleeding and loss of kidney function.3

Betalains are powerful antioxidants that can inhibit the oxidative activity of myeloperoxidase.4 Allegra et al reported the effectiveness of the betalains betanin and indicaxanthin in scavenging hypochlorous acid, the most powerful oxidant produced by human neutrophils.4 Both these betalains reduced the oxidative products of myeloperoxidase. Betalains have also been reported to inhibit the process of chlorination (which also contributes to oxidation). In vitro experiments have shown that betalains from Beta vulgaris root juice and baked, thinly cut slices of beetroot inhibit neutrophil oxidative metabolism and have proapoptotic effects on activated neutrophils.5 Gentile et al observed the ability of betalains to protect an in vitro model of endothelial cells, from oxidation related to inflammatory response.6

Betalain-rich concentrate (BRC) is a proprietary, patent-pending concentrate of beets that is standardized to contain a minimum content of 25% betalains and is substantially free of sugars and nitrates. Our previous pilot clinical study showed that short-term treatment with BRC improved joint function and discomfort of knee joints in individuals with knee distress.7 To confirm this primary observation, we performed a double blind, placebo-controlled clinical study of BRC, in individuals with knee discomfort.

Materials and methods

Study materials

BRC and oat bran were provided by FutureCeuticals Inc (Momence, IL, USA). BRC was derived from red beet (Beta vulgaris L.), depleted of sugars, and concentrated to a total betalain content of at least 25%. The relative composition of BRC has been previously reported by Nemzer et al8 and the components are as follows: betanin (23.8%), isobetanin (30.3%), 17-decarboxy-betanin (3.6%), 17-decarboxy-isobetanin (4.7%), and neobetanin (16.8%). The relative measurement of the pigments is expressed as percentage of the total peak area.

Participant selection and treatment

This study was conducted according to the guidelines set forth in the Declaration of Helsinki, and all procedures involving human subjects were approved by an institutional review board (NCI Vita Clinical SA, Guadalajara, Mexico) (study protocol ABC-NCI-12-16-PLN-OA). All participants signed an informed consent. No adverse events were seen during treatment. Subjects were recruited through advertisements in local papers. Distribution of the treatments and data collection were performed by NCI (NutraClinical Inc., Irvine, CA, USA). Subjects were recruited after they reported at least mild pain on one of the weight-bearing questions posed on the Western Ontario and McMaster Universities (WOMAC) pain subscale.9 Forty subjects with self-reported joint discomfort were recruited for this study. Other than joint discomfort, participants were generally healthy and had no diagnosis of rhinitis, influenza, or other respiratory tract infections, diabetes, or dietary allergies. No medications and/or supplements of any kind were permitted for 15 days prior to and during the study period. Participants were advised to refrain from taking vitamin D, testosterone supplements, or steroid-containing over-the-counter or prescribed medications for 30 days before the study period. Participants were advised to take the capsule in fasting conditions (before breakfast), for the 10 day study period. Subjects were supplied with capsules containing either 50 mg of BRC or 160 mg oat bran (placebo). Participants took one capsule twice a day.10,11

Western Ontario and McMaster Universities Arthritis Index

The WOMAC, is a multidimensional, self-administered health status instrument for patients with osteoarthritis of the hip or knee. The pain, stiffness, and physical function subscales fulfill conventional criteria for face, content and construct validity, reliability, responsiveness, and relative efficiency. WOMAC is a disease-specific purpose built high performance instrument for evaluative research in osteoarthritis clinical trials.9 The WOMAC consists of 24 items divided into three subscales assessing pain (with five items providing a total score ranging from 0 to 20), stiffness (with two items providing a total score ranging from 0 to 8), and functional limitations (with 17 items providing a total score ranging from 0 to 68). Together, the subscales give a total score ranging from 0 (best) to 96 (worst). The WOMAC index was administered on day 1 (pretreatment). Ten male and ten female subjects were distributed in each group, for a total of 20 subjects per group. The WOMAC was also administered after 5 and 10 days of treatment.

McGill Pain Questionnaire

The McGill Pain Questionnaire (MPQ) is a multidimensional pain questionnaire used to quantify the quality and intensity of pain.12,13 The questionnaire was designed to provide quantitative measures of clinical pain that can be treated statistically. On the first category, subjects have to select a word that “describes” the pain (like “flickering”, “pulsing”, “throbbing”). The second category includes the pain components (“fearful”, “frightful”, “terrifying”). The evaluation of the pain (from “no pain” to “excruciating”). The last part includes a miscellaneous description (“spreading”, “radiating”, “penetrating”, “piercing”). After completing the questionnaire, users will have selected seven words that best describe their pain. Each chosen word has an associated numerical value, giving a total score ranging from 0 (no pain) to 78 (severe pain). The MPQ was administered on day 1 (pretreatment) and after 5 and 10 days of treatment.

Visual analog scale score for energy and activity

A visual analog scale (VAS) is a widely used, subjective, unidimensional questionnaire. Energy and activity levels of the subjects were measured using a VAS on day 1 (pretreatment) and after 5 and 10 days of treatment.1416 Subjects were instructed to mark on the line how they were feeling at the moment. The total line length was 100 mm. Left-most marks indicated the highest levels of the parameter (100), while right-most marks indicated the lowest levels (0). The distance of each mark was measured in millimeters from the right end of the line. The measurement for each parameter on days 5 and 10 was subtracted from the day 1 preingestion baseline measurement to give an indication of improvement.

Statistical analysis

Statistical comparisons of the pre- and posttreatment time points, within and between groups were made using GraphPad® Prism® 6.01 (GraphPad Software Inc., La Jolla, CA, USA). A chi-square test was performed to determine whether the data sets had a normal distribution. Normally distributed data was analyzed using a paired two sample t-test. P-values less than 0.05 were considered statistically significant.

Results

Forty participants were selected after being prescreened using the WOMAC scores.9 The total WOMAC score on day zero (pretreatment) showed a mean (± standard deviation [SD]) of 67.8 (±8.8) for the group assigned to the placebo treatment and 62.5 (±5.31) for the group assigned to the BRC treatment.

Both the BRC and the placebo groups consisted of 10 men and 10 women. The participants in the placebo group had a mean age of 52.27 (±6.2) years and a BMI of 26.49 kg/m2 (SD ±2.9); for the BRC-treated group, the mean age was 53.2 (±5.9) years and mean BMI was 27.2 kg/m2 (SD ±2.8).

No significant differences were observed in the WOMAC score of the two groups before treatment (P=0.60) or in the WOMAC score of the two groups after 5 days of treatment. However, after 10 days of treatment, the BRC-treated group had significantly greater improvement (reduction) in the total WOMAC score (26%) than did the placebo group (11%) (P<0.013) (Figure 1).

Figure 1 Total WOMAC score change over baseline at day 10 of treatment.
Notes: The total WOMAC score did not show significant differences between the groups before treatment (P=0.60). The change over baseline or ratio was calculated based on the day 0. WOMAC score did not show a significant reduction of the score after 10 days (11% reduction) when compared with day 0. After 10 days of treatment, the BRC group showed a 26% significant reduction in the score (P<0.01). Values are presented as mean % ± standard error (n=20 in each group).
Abbreviations: BRC, betalain-rich red beet concentrate; WOMAC, Western Ontario and McMaster Universities Arthritis Index.

No differences were observed in the MPQ scores of the placebo and BRC groups prior to treatment (P=0.08). After 5 days of treatment, the MPQ score in the BRC-treated group was 23% better than that of the placebo group (P=0.019). The MPQ score of the BRC-treated group improved further and after 10 days, was 27% better than the placebo group (P=0.003) (Figure 2). We conducted post-hoc power analyses using G*Power version 3.1 (Heinrich-Heine-University, Düsseldorf, Germany)1719 with sample size set at 20 per group, α=0.5, two-tailed. Power (1-β) achieved was at 0.99 for both comparisons, at day 5 and day 10.

Figure 2 McGill Pain Questionnaire score after 5 and 10 days of treatment.
Notes: Data collected on day 0 did not show significant differences between the groups (P=0.08). The McGill Pain Questionnaire score showed significant improvement in the BRC-treated group at day 5 (P=0.019) and day 10 (P=0.003). Values are presented as mean percent change over baseline ± standard error (n=20 per group).
Abbreviation: BRC, betalain-rich red beet concentrate.

The VAS energy scores of the two groups before treatment did not show any significant differences. The VAS energy scores of the BRC-treated group improved (from the baseline), by 19.6 mm on day 5 and by 13.9 mm on day 10 (Figure 3). In contrast, the VAS energy scores of the placebo group were worse, by 15.6 mm on day 5 and by 15.9 mm on day 10. Participants taking BRC had significantly higher VAS energy scores than did participants taking placebo after 5 (P=0.002) and 10 (P=0.012) days (Figure 3). There was no significant difference in the VAS energy scores on the BRC-treated group when day 5 and day 10 were compared.

Figure 3 Average VAS energy score after 5 and 10 days of BRC or placebo treatment.
Notes: Higher scores correspond to better subjective self-report on a 100-point scale. There was no difference between VAS scores prior to treatment between groups. VAS energy scores were improved on the BRC group at day 5 (P=0.002) and day 10 (P=0.012) when compared to placebo. Values were determined with a metric scale, from 0 to 100. Values are presented as mean ± standard error (n=20 per group).
Abbreviations: BRC, betalain-rich red beet concentrate; VAS, visual analog scale.

Discussion

BRC improved discomfort and joint function scores on three assessment instruments. Short-term use of BRC was better than placebo in improving feelings of discomfort, energy level, and joint function. This finding is in agreement with and extends our previous report of the efficacy of BRC.20 We previously reported administering 35, 70, or 100 mg of BRC and demonstrated a dose-dependent effect. The 50 mg dosage used in this study resulted in improvement between that seen with 35 and 70 mg in our previous study. This dosage had sufficient potency to exert a beneficial effect over a relatively short treatment time, 5 to 10 days.

Treatment with 50 mg of BRC twice a day for 10 days resulted in a 26% improvement in scores on the WOMAC, a reliable and well-recognized measure of joint function (Figure 1). BRC treatment also resulted in a significant reduction in the MPQ score, a reliable and well-recognized subjective measure of discomfort (Figure 2). In the current study, the MPQ scores showed a significant improvement of 23% after 5 days. This effect was extended even further to 27% after 10 days. Individuals taking BRC also had significantly higher VAS energy scores than did individuals taking placebo, after 5 and 10 days.

The WOMAC, MPQ, and VAS instruments are valid, reliable, and sensitive assessment tools for measuring joint function, feelings of discomfort, and feelings of energy, respectively. There is evidence to suggest that using multiple instruments gives a better assessment of joint discomfort and function – Gandhi et al reported that use of the MPQ and WOMAC score gave better quantification of pain experiences than did the WOMAC score alone.21 While there is reasonable correlation between these instruments, they also provide significant value as freestanding tools to assess different facets of joint function and discomfort. These tools cannot be used interchangeably.22

Joint discomfort and stiffness are major inhibitors of function and activity.23,24 Current analgesic treatments are intended to reduce discomfort and inflammation. Ideally, reduced discomfort and inflammation lead to decreased stiffness and improved functional activity. Betalains have been reported to reduce myeloperoxidase activity and oxidation, two key components of the inflammatory process.4,6,25,26 Reduction in myeloperoxidase activity reduces the production of hypochlorous acid, a potent oxidant.5,27 Our group is currently investigating the role of betalains in reducing inflammation and improving joint discomfort and function. It is conceivable that a reduction of inflammation, caused by the betalains present in BRC, may have led to reduced feelings of knee joint discomfort and of improved functional activity.

BRC is a promising new natural product for people with joint discomfort. The dose of 50 mg of BRC, twice a day, provided significant improvement in knee discomfort and function within 5 to 10 days, with no side effects. These results were associated with increased feelings of energy, which could be explained by the reduction of knee discomfort, and increased activity level. A larger clinical study is planned, to investigate the effect of long-term treatment with BRC on knee joint comfort, function, and performance.

Acknowledgments

The present study was funded by FutureCeuticals, Inc. We express our gratitude to John Hunter and Brad Evers (FutureCeuticals, Inc.) for their comments and suggestions in the preparation of this article. We would like to thank Michael Sapko for his help in editing the manuscript.

Disclosure

Applied BioClinical is the sister company of FutureCeuticals Inc., Reyes-Izquierdo T, Pietrzkowski Z, Shu C and Argumedo R are employees of Applied BioClinical. Nemzer B is the Director of Research and Development and quality assurance for FutureCeuticals Inc. Wybraniec S has previously collaborated with FutureCeuticals Inc. in the identification and characterization of betalains. The authors report no other conflicts of interest in this work.


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