Ginger (Zingiber officinale) as an Analgesic and Ergogenic Aid in Sport: A Systemic Review : The Journal of Strength & Conditioning Research

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Brief Review

Ginger (Zingiber officinale) as an Analgesic and Ergogenic Aid in Sport

A Systemic Review

Wilson, Patrick B.

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Journal of Strength and Conditioning Research 29(10):p 2980-2995, October 2015. | DOI: 10.1519/JSC.0000000000001098
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Ginger is a popular spice originating from the rhizomes of the plant Zingiber officinale (30). Ginger has been used for centuries to treat a variety of maladies, particularly in non-Western cultures. Today, ginger is used around the world as a dietary supplement and food ingredient. In the 2002 Health and Diet Survey sponsored by the Food and Drug Administration, roughly 1.4% of adult Americans reported using ginger as a dietary supplement over the past 12 months (92).

Several scientific reviews and meta-analyses have examined the use of ginger, including for nausea and vomiting (31), pain management (91), cancer prevention (84), and as an anti-inflammatory (36). Lacking to date, however, is a comprehensive review outlining the physiological effects and potential uses of ginger in the context of exercise training and sport. The sport nutrition supplement industry has expanded dramatically over the past several decades, with the global market reaching an estimated $31.2 billion in 2008 (9). Athletes and sports practitioners considering whether to use ginger would benefit from a review of its physiological effects, potential benefits, and adverse effects in the context of exercise training and sport.

The purpose of this article was to provide an overview of ginger as a dietary supplement for athletes and individuals partaking in exercise training. Particular attention is paid to the analgesic properties of ginger, including plausible mechanisms because pain medications are commonly used by athletes and individuals undergoing exercise training and can cause substantial untoward effects (109). As such, a brief overview of analgesic use in sport is provided. In addition, the physiological effects of ginger on the gastrointestinal (GI) and respiratory systems are outlined because both are stressed during prolonged and intense exercise and are affected by ginger. Subsequently, the results of a PubMed search of studies examining the analgesic and ergogenic effects of ginger in exercise training and sport are outlined. Finally, adverse effects of ginger supplementation and research needs are discussed to help guide future work.

Analgesic Use in Sport

Ginger has received significant study as an analgesic in both human (8,75,91) and animal models (23,76,83). Identifying alternative analgesics for use in sport and exercise training is an important issue given the plethora of adverse effects that accompany analgesic medications. Nonsteroidal anti-inflammatory drugs (NSAIDs) are the most widely available class of analgesics used by athletes (109). Consequently, a brief overview of the prevalence of use and adverse effects of NSAIDs in sport is provided.

Prevalence of NSAID Use in Sport

Nonsteroidal anti-inflammatory drug use is highly prevalent during international athletic competitions, with a substantial proportion of athletes using NSAIDs prophylactically and consuming multiple NSAIDs simultaneously (24,99,100). During the XV Pan American Games, for example, nearly 65% of athletes reported using NSAIDs (24). Estimates from the 2000 Sydney Olympics were lower at 25.6% for athletes undergoing doping control, but these athletes were asked to report medications used only during the past 3 days (22). During the 2002 and 2006 FIFA World Cups, 30.8% of athletes took NSAIDs before a match and 10.6% took NSAIDs before every match (100).

Sports that involve violent contact, such as American football, are also susceptible to frequent NSAID usage. Among collegiate footballers, 73% reported using NSAIDs for pain during the previous season, with approximately one third of players taking more than the recommended dose (117). Similarly, in a survey of high school footballers, 75% had used NSAIDs sometime over the past 3 months (111). While the prevalent use of NSAIDs in contact sports is somewhat expected, NSAID use is also widespread among individuals participating in noncontact activities. Between 50 and 70% of endurance athletes competing in triathlons, marathons, and ultra-marathons report using NSAIDs on a regular basis (35,45). Of equal concern, knowledge regarding the adverse effects of NSAIDs seems to be low and limited to GI side effects (35).

Adverse Effects of NSAIDs in Exercise Training and Sport

The overuse of NSAIDs raises a host of concerns, both acutely and chronically. Nonsteroidal anti-inflammatory drugs can cause GI pain, GI hemorrhaging, nephropathy, hepatitis, and anaphylactic reactions (87,90) and are frequently implicated in hospital admissions stemming from drug interactions (10).

While it has long been established that NSAIDs can cause adverse effects, recent research raises concern over their use in the context of exercise training and sport. In the short term, NSAIDs can suppress muscle protein synthesis and muscle regeneration following an exercise bout, at least in young individuals (55,97). It has been hypothesized that cyclooxygenase (COX) enzymes regulate muscle protein synthesis and that COX inhibition may blunt the rise in muscle protein synthesis that normally accompanies exercise (112). Nonsteroidal anti-inflammatory drugs inhibit COX enzymes and have therefore been implicated as possible negative modifiers of training adaptations (55). However, studies examining the long-term effects of NSAID consumption on the functional and morphological adaptations to resistance training have failed to find negative effects (47,96). The effect of NSAIDs on mitochondrial adaptation to exercise has also received scientific attention, and although in vitro and animal models show that NSAIDs can have deleterious effects on mitochondrial function, data from in vivo human models are lacking (78).

In terms of GI functioning, NSAIDs reduce intestinal barrier integrity and increase GI permeability during exercise (50,105), which may increase the inflammatory response to prolonged exercise (68) and the risk of heat illness (49). The negative GI effects of NSAIDs also extend to endurance competition. Participants of the 2010 Bonn Marathon who used analgesics (with the majority being NSAIDs) had 5.1 times the odds of experiencing an adverse event and were 10 times more likely to experience GI cramps than nonusers (48). In addition, GI cramps were 2–3 times as likely to be blamed for race withdrawal in analgesic users. Of even greater concern, 9 cases of hospital admittance were reported, all of which occurred in analgesic users (48). Athletes commonly consume NSAIDs to minimize existing or anticipated pain during exercise, believing it will allow them to continue competing because of this reduced pain. Evidence for this benefit, however, is lacking in the scientific literature (109), and as a consequence, it is unknown whether GI symptoms caused by NSAIDs override their possible musculoskeletal pain relief effects, and ultimately, how the balance of these factors influences performance.

Nonsteroidal anti-inflammatory drugs have also been implicated in the development of hyponatremia during endurance competition (25,113), a potentially fatal condition causing disorientation, nausea, headache, and muscle weakness (66). They are thought to influence the development of hyponatremia, in part, by altering the action of arginine vasopressin (AVP). They decrease renal prostaglandin synthesis, and because prostaglandins inhibit AVP, NSAID ingestion leads to increased AVP action and decreased fluid excretion (53). It should be noted, however, that not all studies have found NSAIDs increase the risk of hyponatremia (2,38,76). The lack of an association between NSAIDs and hyponatremia in these studies may be due to the modest sample sizes (38), mild environmental conditions (2,76), and limited fluid availability during the race (76).

Regarding respiratory function, NSAIDs have bronchoconstrictive properties that may exacerbate symptoms in individuals with exercise-induced asthma and bronchoconstriction (67). COX-1 and COX-2 enzymes are expressed in the airway epithelium of humans (26) and are thought to play a role in respiratory function by influencing the production of prostaglandin E2 (73). Prostaglandin E2 acts on prostaglandin E receptors on respiratory mast cells, influencing the release of histamine and leukotrienes (37). Nonsteroidal anti-inflammatory drug ingestion inhibits COX enzymes, which, in turn, decreases the production of prostaglandin E2, contributing to hypersensitivity of the airways to antigens (73). While estimates vary depending on the population studied, 21% of adults and 5% of children with asthma demonstrate an asthmatic response when ingesting NSAIDs, most commonly in the form of aspirin (43). Surprisingly, the influence of exercise-induced bronchoconstriction on exercise performance remains largely unknown, and although it seems logical that treating exercise-induced bronchoconstriction would enhance exercise performance, this has not been consistently shown (74). Consequently, more research is needed to delineate the interrelationships between NSAID use, exercise-induced bronchoconstriction, and athletic performance.

Over the long term, frequent and heavy NSAID use increases the risk of cardiovascular events (61). This increased risk of cardiovascular events is partly attributable to the effects of NSAIDs on hypertension risk (33,34), a condition that is responsible for 7.6 million annual deaths worldwide (5). The increased risk of cardiovascular disease is of particular concern for athletes participating in sports that encourage a large body mass and that involve violent collisions, such as American football. Footballers with a high body mass index (BMI > 28) are simultaneously more likely to use NSAIDs (39) and show elevated cardiometabolic risk factors (7,17), and as a consequence, chronic NSAID usage in these athletes may be particularly deleterious for their long-term cardiovascular health.

Finally, NSAIDs may have undesirable effects on remodeling and repair of connective and bone tissue. In one study, NSAID consumption blunted the rise in patellar collagen synthesis following a 36-km bout of running (20), suggesting that NSAID usage for chronic tendonopathies could have detrimental effects on connective tissue remodeling. In support of this hypothesis, experimental animal research demonstrates that NSAIDs delay ligament (110) and tendon (21,32) repair, as well as interfere with bone fracture healing (11). While data from humans are limited, NSAID use was associated with a 44% higher fracture risk in a population of perimenopausal women (107) and regular NSAID users had a higher risk of nonvertebral fractures than nonusers among a population of men and women in the United Kingdom (103). Notably, the magnitude of fracture risk observed varies, for unknown reasons, between different types of NSAIDs (108).

Mechanisms of Ginger Analgesia

The mechanisms behind the analgesic properties of ginger remain an active area of research, with several separate mechanisms likely responsible. Like NSAIDs, ginger blocks the activity of COX enzymes (51,93) and leukotriene and prostaglandin synthesis (46). Beyond its effects on COX enzymes, ginger is an agonizer of the transient receptor potential vanilloid 1 (91), which can be found throughout the peripheral and central nervous systems and influences pain processing (63). Ginger has also shown the capacity to inhibit the release of proinflammatory cytokines from macrophages in vitro (98). Proinflammatory cytokines are thought to, at a minimum, play a role in exacerbating exercise-induced muscle pain (18).

Gastrointestinal Effects of Ginger

Ginger, in contrast to NSAIDs, may act as a promoter of GI function. In a study of individuals with osteoarthritis, ginger extract was as effective as diclofenac for pain management but led to less GI discomfort and increased stomach mucosa prostaglandins (29). Animal studies confirm that ginger reduces gastric lesions with exposure to gastroerosive substances (3,56), which may be due to the inhibition of gastric H+ and K+‐ATPase and reduction in gastric acid secretion (85). Additionally, ginger increases stomach mucosa prostaglandins (29), whereas NSAIDs deplete them (87), and these differential effects may be due to selective COX-2 inhibition by ginger constituents (102).

Ginger has long been regarded as an antiemetic agent. A review of randomized controlled trials examining the effectiveness of ginger for pregnancy-induced nausea and vomiting concluded that ginger reduced the frequency of vomiting and intensity of nausea (28). On the contrary, a review of randomized trials examining the efficacy of ginger for chemotherapy-induced nausea and vomiting found no conclusive evidence that ginger was an effective antiemetic agent (52). A review by Palatty et al. (70) confirmed that the research to date has been contradictory and suggested that the equivocal results may be due to, among other factors, variations in the bioactive compounds of the ginger treatments.

Despite clinical trial data showing contradictory findings, mechanistic studies strongly support the biological plausibility of ginger as an antiemetic. Specifically, ginger constituents act as serotonin receptor antagonists in the GI tract, preventing the overactivation of vagal afferent nerves involved in the pathogenesis of nausea and vomiting (40,44). Serotonin release in the GI tract can cause antral contractions that contribute to symptoms of nausea (86).

Nausea is commonly experienced during exercise, particularly intense endurance running. In one survey of marathoners, approximately 20% reported experiencing nausea during self-described “hard” runs, with the prevalence being even higher among females (77). As a result, ginger represents an intriguing compound for the prevention and management of exercise-induced nausea. However, the author is not aware of any published research that has examined the effects of ginger on exercise-induced nausea.

Respiratory Effects of Ginger

Preliminary evidence indicates that ginger acts as a bronchodilator and could potentially be used as a treatment for exercise-induced bronchoconstriction. The mechanisms behind the bronchodilatory effects of ginger are not entirely clear but seem to involve action on the β-adrenergic receptor (57) and alterations of intracellular Ca2+ in airway smooth muscle cells (94).

Experimental research in mice (94) and rats (57) has shown that ginger reduces airway hyper-responsiveness. Moreover, isolated human airway smooth muscle cells show significant and rapid relaxation with exposure to ginger (94), even when cells are simultaneously exposed to β-agonists (95). As β-agonists are a first-line therapy for asthma, ginger could be used as an adjunctive treatment and should be evaluated as such in future research. To date, only one controlled trial has assessed ginger in asthmatic humans, which demonstrated improvements in wheezing, chest tightness, and dyspnea with no changes in spirometry after 2 months of ginger supplementation (79).

Exercise-induced bronchoconstriction, which is a transient narrowing during or after exercise, affects up to 90% of individuals with asthma and up to 50% of elite athletes (80). Unfortunately, no published research has evaluated the effects of ginger supplementation on exercise-induced bronchoconstriction. Given the strong biological plausibility of ginger as a bronchodilator, more clinical trials are called for to evaluate the safety and efficacy of ginger as a primary and adjunctive treatment for exercise-induced bronchoconstriction.

Ginger as an Analgesic and Ergogenic Aid for Exercise Training and Sport

Search Methodology

A PubMed literature search was conducted in April of 2015 to identify investigations that have examined ginger supplementation in the context of exercise training and sport. The following combinations of terms were used to identify relevant articles: “ginger exercise,” “Zingiber exercise,” “ginger soreness,” “Zingiber soreness,” “ginger sport,” and “Zingiber sport.” Only randomized controlled trials were included in the analysis. Studies examining ginger as a part of a multi-ingredient supplement were not included due to an inability to differentiate the effects of ginger from other ingredients.

The results of the literature search are presented in Figure 1. In total, 6 articles (7 studies) examining the analgesic properties of ginger for exercise training and sport were identified (12–14,58,60,116). Eight articles (9 studies) examining the effects of ginger as an ergogenic aid were identified (6,12–14,58,60,116,118). The details of these investigations are subsequently outlined.

Figure 1:
Overview of the PubMed search of studies examining ginger as an analgesic and ergogenic aid for exercise training and sport.

Ginger as an Analgesic for Exercise Training and Sport

Table 1 provides an overview of the 7 studies that have evaluated the analgesic properties of ginger for exercise training and sport. Black and O'Connor (13) were the first to evaluate the analgesic properties of ginger in the context of exercise-induced pain. Using a crossover design, 25 untrained college-age individuals ingested 2 g of ground ginger or placebo 30 minutes before cycling for 30 minutes at 60% V[Combining Dot Above]O2peak, while ratings of quadriceps pain were collected every 5 minutes. Although quadriceps pain ratings showed small increases from the start to end of exercise in both conditions, no significant differences in pain were found between conditions.

Table 1-a:
Studies examining the analgesic properties of ginger for exercise training and sport (in chronological order).*
Table 1-b:
Studies examining the analgesic properties of ginger for exercise training and sport (in chronological order).*

An additional study from Black and O'Connor (14) evaluated the effects of 2 g of ginger or placebo on pain stemming from eccentric elbow flexor exercises. Untrained participants consumed dried ginger extract or placebo capsules 24 and 48 hours after eccentric exercises and rated muscle pain roughly 30 minutes later. The study used a crossover design, such that half of the participants consumed ginger at 24 hours, while the other half consumed placebo at 24 hours. Subsequently, participants who consumed ginger at 24 hours consumed placebo at 48 hours, and vice versa for placebo. Overall, ginger had no effect on muscle pain relative to placebo. Among participants who received ginger at 24 hours, arm pain was reduced by 13% relative to participants who received placebo at 24 hours, although this difference was not statistically significant (Cohen's d = 0.48, p = 0.21).

Although the aforementioned studies found no clear benefit of acute ginger supplementation on exercise-induced muscle pain, additional studies from Black et al. (12) found that 11 days of ginger supplementation (2 g·d−1) reduced pain stemming from eccentric actions of the elbow flexors. To induce muscle soreness, untrained participants completed 3 sets of 6 repetitions of elbow flexor exercises using a weight equal to 120% of concentric 1 repetition maximum (1RM). The article presented the results of 2 separate studies, one of which compared ground raw ginger with placebo while the other compared heat-treated ginger with placebo. In both studies, participants consumed ginger or placebo capsules for 7 days before, the day of, and for 3 days after the elbow flexor protocol. Raw ginger reduced muscle soreness by 25% (p = 0.041) relative to placebo, while heat-treated ginger reduced soreness by 23% (p = 0.049) relative to placebo. The duration of supplementation was the major difference between these and previous investigations, suggesting that the analgesic properties of ginger may require several days to take full effect.

The longest study identified was conducted over a period of 6 weeks (58). Sixty Iranian female taekwondo athletes were randomized in a double-blind fashion to 3 g·d−1 of ginger powder, cinnamon powder, or placebo for 6 weeks, and levels of interleukin 6 (IL-6) and muscle soreness (7-point Likert scale) were collected. A total of 49 athletes completed the 6-week intervention, and muscle soreness after 6 weeks was lower with ginger in comparison with placebo (0.67 vs. 1.57, p < 0.01). However, no intention-to-treat analysis was performed, and the number of dropouts for each group was not provided, casting doubt on the findings.

More recently, Matsumura et al. (60) examined the effects of 5 days of ginger powder supplementation (4 g·d−1) on soreness resulting from eccentric elbow flexor exercises. Unlike the study from Black et al. (12) that also examined multiple days of ginger ingestion, supplementation was limited to the 5 days before exercise and was not continued during the postexercise evaluation period. No treatment × time interactions were observed for biceps soreness on a 100-mm visual analog scale, indicating no significant effect of ginger supplementation.

Finally, Wilson et al. (116) tested whether 5 days of 2.2 g·d−1 ginger root reduced muscle soreness among college students undertaking a 20–22 mile training run. Muscle soreness was assessed at rest and during dynamic movements such as jogging. Although soreness at rest on a 100-mm visual analog scale was not significantly reduced with ginger root, median soreness during jogging 24 hours after the training run was lower with ginger root compared with placebo (37 vs. 62 mm; p = 0.04). Limitations to this investigation include the relatively small sample size (n = 20) and slight variations in distance covered during the training run between the ginger root and placebo groups.

On the whole, 2 g·d−1 of ginger taken for a week before and 3 days after eccentric resistance exercise may modestly reduce muscle pain. Likewise, ginger taken for 3 days before and the day after a prolonged run may modestly reduce pain during jogging. However, a single dosage of 2 g of ginger does not substantially reduce muscle pain stemming from resistance or cardiorespiratory exercise. No conclusions can be drawn regarding the prolonged use of ginger (>2 weeks) for pain management during chronic exercise training.

Ginger as an Ergogenic Aid for Exercise Training and Sport

Table 2 provides an overview of the 9 studies that have evaluated ginger as an ergogenic aid for exercise training and sport. Black and O'Connor (13), in addition to assessing muscle pain during 30 minutes of moderate-intensity cycling, measured perceived exertion, heart rate, and oxygen uptake 30 minutes after 2 g of ground ginger ingestion. No significant differences were noted between any of the measures, indicating that acute ginger ingestion does not likely affect cardiorespiratory function during brief moderate-intensity exercise. The other study from Black and O'Connor (14) evaluated the effects of ginger on range of motion, arm volume, and metabolic rate after eccentric actions of the elbow flexors. A single 2 g dose of dried ginger extract had no significant effect on any of the outcomes.

Table 2-a:
Studies examining the ergogenic properties of ginger for exercise training and sport (in chronological order).*
Table 2-b:
Studies examining the ergogenic properties of ginger for exercise training and sport (in chronological order).*
Table 2-c:
Studies examining the ergogenic properties of ginger for exercise training and sport (in chronological order).*

The aforementioned 11-day study from Black et al. (12) assessed changes in isometric force and perceived exertion with 2 g·d−1 ginger supplementation. As noted previously, the article presented the results of 2 separate studies, one of which compared raw ground ginger with placebo while the other compared heat-treated ginger with placebo. Isometric force before and after the exercise protocol was assessed at 90 degrees of elbow flexion by having participants grasp a wooden bar connected to a force transducer. Range of motion, arm volume, and prostaglandin E2 levels were also assessed, as was rating of perceived exertion during a series of 3 concentric/eccentric actions of the elbow flexors using a weight equal to 50% of concentric 1RM. No significant group × time interactions were found in either study for elbow range of motion, isometric force, or prostaglandin E2 levels. Although not statistically significant, effect sizes for perceived exertion at 24 and 48 hours post-protocol were modest-to-moderate in size (Glass's delta = −0.35 to −0.59), eluding to a possible benefit of ginger.

The observation from Black et al. (12) that ginger reduced muscle pain but had no effect on muscle function raises the possibility that ginger may differentially affect the pathways involved in these 2 types of outcomes. In support of this possibility, research with other nutritional compounds has shown reductions in muscle soreness without parallel improvements in muscle function (16,41). COX inhibition, a primary pathway of ginger, may reduce muscle soreness but have little effect of muscle function (71), providing a mechanistic rationale for why ginger may differentially affect muscle soreness and function outcomes.

Atashak et al. (6) used a randomized factorial design to study the effects of 10 weeks of 1 g·d−1 of ginger root powder alone or in combination with resistance training on body composition changes. Thirty-two obese men were randomized to 1 of 4 groups (placebo, ginger, placebo + resistance training, or ginger + resistance training), and body composition was assessed using skinfold measurements. Both resistance training groups showed decreases in fat mass and increases in lean mass, with no effect of ginger supplementation. However, the study was statistically underpowered to detect small-to-moderate effects given the small sample size (n = 8 group) and the lack of sensitivity of skinfolds.

Mashhadi et al. (59) assessed the effects of 3 g·d−1 of ginger powder in comparison with cinnamon or placebo on exercise performance, body composition, and oxidative stress in a sample of Iranian female taekwondo athletes. Forty-nine of 60 athletes completed the intervention, which curiously, was reported to last 6 weeks at several points in the article but reported as 8 weeks at other points. Additionally, the exercise performance test was not clearly outlined in the methods nor were the units of measurement in the results. Furthermore, it was not clear in the results which type of statistic was used for each comparison, making any meaningful interpretation of the findings difficult.

In a similar fashion, Zehsaz et al. (118) examined ginger supplementation in trained male runners over a multiweek training period. Twenty-eight runners were randomized to 1.5 g·d−1 of dried ginger powder or placebo, which was consumed during the last 6 weeks of a 12-week training period. Of note, specific sample sizes for each group were not provided. Inflammatory markers, tumor necrosis factor (TNF)-α, IL-6, IL-1β, were measured at rest and after a Bruce treadmill test to establish whether ginger induced anti-inflammatory properties in the context of endurance training. At the end of the 6-week supplementation period, levels of TNF-α, IL-6, and IL-1β after the Bruce treadmill test were lower by roughly 20–45% in the ginger group relative to placebo. No differences between the 2 groups were observed for resting inflammatory marker levels. It should be noted that some research suggests that blocking oxidative stress and inflammatory pathways may, in certain situations, blunt the functional adaptations to exercise (72), and because the authors did not include any data comparing functional adaptations between the groups, strong conclusions cannot be made as to whether the reduced inflammatory response should be viewed favorably.

The aforementioned study from Matsumura et al. (60) evaluated changes in biceps strength, range of motion, arm circumference, and creatine kinase levels with 5 days of ginger powder supplementation (4 g·d−1). The ginger group showed a recovery of elbow flexor 1RM strength over the 24- to 48-hour postexercise recovery period, whereas a significant improvement was not observed in the placebo group until 48- to 96-hour postexercise (60). These effects resulted in a significant time × treatment interaction, suggesting that ginger accelerated the recovery of 1RM strength. Despite the accelerated recovery of strength, no clear benefits for range of motion or arm circumference were observed with ginger supplementation. Interestingly, creatine kinase increased over the postexercise period in the ginger group but not placebo. The authors speculated that ginger supplementation could have improved muscular function, allowing participants to perform more work during the eccentric elbow flexor exercise protocol. However, the authors did not provide direct data to support this suggestion.

Finally, Wilson et al. (116) assessed whether 5 days of 2.2 g·d−1 ginger root maintained muscle function to a better degree than placebo after a 20–22 mile training run. A squat jump from a force plate was used to evaluate muscle function before and after the training run, and overall, no differences in jump height, peak force, or rate of force development were detected between the ginger root and placebo groups. These results showing a reduction in muscle soreness without any substantial benefit for muscle function support the results from the study by Black et al. (12).

Overall, the available research indicates no clear ergogenic benefit of ginger on oxygen use, heart rate, metabolic rate, body composition, isometric force generation, or perceived exertion. A single investigation suggests relatively high-dose ginger supplementation (4 g·d−1) may accelerate recovery of upper body strength after eccentric resistance exercise. In addition, chronic ginger supplementation may reduce the inflammatory response to cardiorespiratory exercise. More research is needed to determine whether ginger supplementation affects other performance outcomes such as the functional adaptations to chronic resistance and cardiorespiratory training.

Adverse Effects of Ginger

Ginger is generally recognized as safe by the Food and Drug Administration (101). Despite this designation, clinical trials with ginger reveal the occurrence of several types of adverse events, albeit nearly all mild in nature. Heartburn has been observed in a number of studies (4,19,62,75,114,115) and has been reported as a cause of study withdrawal (114,115). The frequency of heartburn varies with study duration and dosage of ginger but has ranged from 3 to 27% (4,62). Other adverse effects of ginger on the GI tract include exfoliation of gastric epithelial cells at high doses (6 g), indicating that ginger has the potential to act as a GI irritant when taken in large amounts (27).

Warnings regarding the potential for ginger to increase the risk of bleeding and to interact with anticoagulant medications are present in the literature (64,82). Suggestions that ginger may increase bleeding time are primarily based on in vitro research showing that ginger inhibits thromboxane synthesis and platelet aggregation (69,88). Ginger supplementation trials in humans, however, have been equivocal; several studies have found no significant effects on thromboxane production (42,54) or bleeding time (54), with others showing significant decreases in platelet aggregation (15,106) and thromboxane production (89).

It is yet to be determined whether ginger, like NSAIDs, influences hyponatremia risk and connective and bone tissue remodeling. Human studies examining the effects of ginger on renal physiology and function are needed to establish whether ginger is a potentially nephrotoxic agent that should be avoided during prolonged endurance exercise. Likewise, additional research is needed to determine whether ginger supplementation modifies the connective and bone tissue remodeling process that normally occurs with weight-bearing exercise.

Finally, the effects of ginger on muscle protein synthesis and adaptations to endurance and resistance training require examination. It has been hypothesized that COX enzymes regulate muscle protein synthesis and that COX inhibition may blunt the rise in muscle protein synthesis that normally accompanies exercise (112). Given ginger's inhibition of COX enzymes, it is possible that chronic ginger consumption may modify the functional and morphological responses to resistance and endurance training.

Future Research Needs

A common limitation of the human research on ginger is a lack of reporting and/or standardization of bioactive compounds in treatments (70,91). Ginger contains many bioactive compounds, such as gingerols and shogaols, which are known to have varying effects on physiological pathways, including COX enzymes (1,102). Variations in the concentrations of these bioactive compounds make between-study comparisons and clinical application challenging. Additionally, the myriad of ways ginger can be prepared (e.g., powder, oil, extract, ground, heat-treated) further complicates between-study comparisons.

Reporting of adverse events among studies examining ginger as an exercise- and sport-specific supplement has been absent (6,13,14,58–60,118) or lacking in detail (12,116). Failure to systematically collect data on adverse events makes it difficult to properly evaluate the benefit-to-risk ratio of ginger. Guidelines for the reporting of adverse events are outlined in the Consolidated Standards of Reporting Trials (CONSORT) statement (65). Among other recommendations, CONSORT advises that adverse events should be listed and defined, the methods used to collect adverse events should be described, and the absolute risk of each adverse event and number of withdrawals should be reported (65).

The pungent flavor and aroma of ginger are substantial obstacles to designing placebo-controlled double-blind trials. This may be particularly problematic for studies supplementing ginger before prolonged endurance exercise, given the relatively frequent incidence of reflux experienced during endurance exercise and with ginger supplementation. Although all of the articles identified from this review's PubMed search reported double-blinding, only 2 collected information on the success of blinding (12,116). While the utility of formally assessing the success of blinding has been questioned (81), ascertaining reasons why a participant believes they were consuming ginger or placebo (e.g., ginger smell or taste) may provide insight as to whether the sensory characteristics of the treatment and placebo were well-matched. Interestingly, ginger may be easier to blind if it is administered in blister packs as opposed to bottles, due to the odor arising from the storage of numerous ginger capsules in a single container (104,119).

Notably, several of the studies included in this review recruited untrained participants (12–14,60), including one that found ginger reduced soreness (12) and another that showed ginger accelerated recovery of strength (60). While it is common for muscle damage studies to use untrained individuals (presumably because it is easier to induce muscle soreness), this practice limits generalizability of the findings. Consequently, studies including trained individuals will be needed to further elucidate the analgesic properties of ginger in athletic populations.

Practical Applications

The evidence indicates that 2 g·d−1 ginger may modestly reduce muscle pain stemming from eccentric resistance exercise, particularly in untrained individuals and if taken for 1–2 weeks. Likewise, 5 days of ginger supplementation (2 g·d−1) may modestly reduce soreness stemming from prolonged running, whereas 5 days of high-dose supplementation (4 g·d−1) may accelerate recovery of muscular strength after eccentric resistance training. On the contrary, a single dose of ginger has little-to-no discernable effects on muscle pain, metabolic rate, oxygen use, isometric force generation, or perceived exertion. In addition, chronic ginger consumption does not seem to modify body composition responses to resistance training. However, chronic ginger supplementation may reduce the inflammatory response to exercise, although the implications of these effects are unknown.

Despite shortcomings in the research, tentative and circumstantial evidence suggests that ginger may offer a favorable combination of analgesic, GI, and respiratory effects, and thus, it seems reasonable to conduct additional research evaluating ginger as an analgesic and ergogenic aid for exercise training and sport. Future research should directly compare the analgesic properties and side effects of ginger with NSAIDs in athletes and individuals undergoing exercise training. These future trials should include trained individuals and pay particular attention to blinding effectiveness and reporting of adverse events, as these details have been lacking in the research to date.


The author discloses no conflicts of interest. The entirety of this article was conceived and drafted by P. B. Wilson.


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