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Delayed Onset Muscle Soreness

Revision as of 05:44, 18 January 2013 by User:Fellrnr (User talk:Fellrnr | contribs)

Revision as of 05:44, 18 January 2013 by User:Fellrnr (User talk:Fellrnr | contribs)

Delayed Onset Muscle Soreness (DOMS) is a familiar experience to most people who exercise. It affects people who weight train and run particularly, and DOMS can produce anything from mild muscle soreness to debilitating pain and weakness.

Contents

1 What is DOMS?

The soreness of DOMS generally peaks between 24 and 72 hours after unusual or severe exercise, though soreness may occur sooner after running[1]. DOMS is particularly related to eccentric exercise, which is where the muscle works to resist becoming longer, rather than working to contract. When you muscles absorb the impact of running, this is eccentric exercise, and Downhill Running is more eccentric than flat or uphill running. The images below show the damage that occurs from eccentric exercise[2] and marathon running[3]:

  • Muscle damage from eccentric exercise (downhill running)

  • Muscle before downhill running

  • Immediately after downhill running. Notice the disruption to the dark bands (z-bands) that are part of the muscle structure showing there is immediate damage.

  • One day later, the damage and disruption is worse, indicated some continued breakdown.

  • Muscle 14 days later, structurally recovered (other metrics do not return to pre-exercise levels at 14 days).

  • Muscle damage after running a marathon

  • The selective pattern of damage, showing the normal upper fiber adjacent to the 'moth eaten' appearance of the damaged lower fiber.

  • Here you can see extreme damage, with only the Z band of the fiber remaining (marked Z). Adjacent fibers show far less damage.

2 What are the symptoms of DOMS?

The soreness of DOMS is different to other forms of muscle soreness. With DOMS, large areas of the muscle are tender to the touch and painful when the muscle is used. With other forms of muscle soreness the area of tenderness is usually more localized and the pain of massage is sometimes described as a 'good pain'. The pain of DOMS will normally lessen with light exercise such as walking, which is often described as 'loosening' up. In addition, there are other symptoms, such as:

  • Reduction in strength[4][5][6][7], typically 30-60%[8]. (Note that the reduction in strength starts immediately following the damaging exercise and increases over the next 24-48 hours[9]. The initial reduction in strength can be as much as 40%[8].)
  • Increased passive muscle tension[10]. A muscle suffering from DOMS will often be hard to the touch, even when relaxed as much as possible.
  • Swelling of the muscle[10], which can be seen as a lack of muscle definition in lean individuals.
  • The perceptions of joint angle and force are impaired[4], which can result in reduced coordination and a sense of clumsiness.
  • A reduction in the Range of Motion[4][5][6].
  • Changes in running biomechanics, possibly as compensation for other changes[11]. For instance, the reduction in Range of Motion can result in a reduction in stride length.
  • Decreased Running Economy[12][13].
  • Impaired Glycogen repletion[12][13], though higher carbohydrate intake partly offsets the reduction[14]. There is some evidence that Glycogen levels continue to drop after DOMS inducing exercise[15][16], and the deficiency in glycogen lasts for over 72 hours[16].
  • There are some studies that indicate there are possible changes in muscle fiber recruitment patterns[17][18][19].

3 Why is DOMS important?

Because running involves a lot of eccentric stress, DOMS is common in runners, especially after Downhill Running. The pain that occurs 24-72 hours after exercise can prevent continued training. However, the biggest issue for long distance runners is that although the pain occurs 24-72 hours after exercise, the weakness peaks after 30 minutes [20]/>. If you've ever run a long, steep descent, you'll know the strange feeling of weak numbness that pervades your quads as the effect of the downhill builds up. The Boston Marathon or the latter part of Mount Mitchell Challenge have descents that cause this type of weakness. If you've felt a similar weakness in the latter stages of a marathon, this may not be Glycogen depletion creating 'the wall', but eccentric muscle damage that will later manifest itself as DOMS. It is suggested that this is the reason the Boston Marathon course is relatively slow, even though it is a net decent.

4 What does DOMS mean to you?

There is some good news in all of this. While excessive eccentric exercise can cause DOMS, doing some eccentric exercise causes the muscles to adapt and to be able to handle eccentric exercise without DOMS [21]. There are two ways then of protecting your muscles from DOMS in running; running greater distances, or running downhill. I believe that downhill running that is greatly underutilized in training regimes. Most hill training workouts focus on the uphill segment, and relegate the downhill to recovery. While uphill can produce some benefits, it is the downhill that can provide the greatest advantage. Adding hills into your workout can make you a much stronger runner, and have benefits even on flat race courses. Don't just use the downhill to recover from the uphill, but work on the downhill.

5 How to prevent or treat DOMS?

There are various approaches to preventing or treating DOMS. The table below is a summary of the approaches showing how likely the strategy is to prevent or treat DOMS combined with the possible downsides. At the top are those that are likely to help and have no downsides, then those that have no effects or downsides, then those with little benefit and significant downsides.

Strategy Timing Soreness Weakness Downsides
Repeated Bout Effect Before (days to months) Strong evidence of reduced weakness Some evidence of reduced weakness None
Carbohydrate and/or protein After Some evidence of reduced soreness Strong evidence of reduced weakness None
Compression Clothing After Some evidence of reduced soreness Some evidence of reduced weakness None
Caffeine After Some evidence of reduced soreness Some evidence of reduced weakness None
Massage After Some evidence of reduced soreness No benefit None
Warmup Immediately before Some evidence of reduced soreness No benefit None
Light Exercise After Transient pain reduction No benefit None
TENS After Transient pain reduction No benefit None
Icing After No benefit No benefit None
Antioxidents Before and/or After Mixed evidence Mixed evidence Conflicting evidence of reduced endurance adaptations
Stretching Before and/or After No benefit No benefit
  • Stretching temporarily weakens muscles
  • Can induce DOMS
  • Can lead to injury
NSAIDs Before and/or After Most evidence indicates no benefit Most evidence indicates no benefit Can impair recovery

5.1 Repeated Bout Effect

The DOMS that follows an initial bout of eccentric exercise is much less on subsequent similar bouts. This is often called the Repeated Bout Effect (RBE)[10][9]. The initial bout does not have to cause significant soreness or damage[22]. As few as 2-10 maximal eccentric repetitions can protect against a subsequent larger bout (24-50), but the initial bout must be close to maximal effort[23]. By contrast, eight weeks of training with 50% of the maximal eccentric load did not provide protection against a subsequent maximal bout[24]. There is some cross-over of protection between different forms of exercise. For instance, eccentric weight training protects against soreness and weakness in subsequent downhill running[25]. The protection from the RBE is long lived. One study showed that while the initial weakness was not reduced by the RBE, the recovery of strength was much faster for up to 9 months, and soreness was less for up to 6 months[26]. Another study showed that 30 minutes of downhill running provides protection for between 6 and 9 weeks[27]. There is evidence that the RBE may rapidly start to provide protection from soreness and weakness[28], possibly as soon as 24 hours post exercise[29].

5.2 Carbohydrate and Protein

Main article: Nutrient Timing

The damage of DOMS requires repair, so it's not surprising that taking protein or amino acids, which are the building blocks of the muscle fibers, helps with recovery.

  • Most studies show that amino acids reduce muscle soreness[30][31] [32][33], and may[33][31] or may not reduce weakness[34][35][34].
  • Most studies have shown that protein will reduce muscle weakness after DOMS inducing exercise[36][37] [38][39][40], with only two studies showing no improvement[41][42].
  • The effect of protein on soreness is more mixed with some studies showing improvement[43] [44][40], but others not[36][45][42].
  • Not surprisingly timing may be important, with CHO+PRO having an effect on muscle weakness directly after or 24 hours after, but not before DOMS inducing exercise[39], as shown below.
  • In addition to reducing muscle soreness, protein supplementation in military recruits also reduced illness and injury[44].
  • Taking carbohydrate alone after DOMS inducing exercise does not appear to help[46][47].
The change in strength after DOMS inducing exercise. CON: control, PRE: protein before, POST: protein immediately after, TWENTY-FOUR: protein 24 horus after[39].

Protein helps with recovery from DOMS[40]. The graphs below show the impact of 100 grams of Protein taken immediately after 30 minutes of downhill running. Note that muscle soreness peaked at 72 hours, even though force and power had returned to baseline.

Peak force generated after DOMS inducing eccentric exercise. (*is significant change from baseline, double S marker indicates significant change from treatment.)
Peak power generated after DOMS inducing eccentric exercise.(*is significant change from baseline, double S marker indicates significant change from treatment.)

5.3 Caffeine

Main article: Caffeine

Caffeine has shown to be effective in reducing the pain of DOMS, as well as reducing the weakness[48]. (The reduction in weakness did not reach statistical significance in regular caffeine users[49].) While the evidence for caffeine reducing the weakness of DOMS, this is one of the few approaches that can help offset the weakness during the damaging exercise.

5.4 Massage

Main article: Massage

Massage is widely used to prevent and treat injuries. Most meta-analysis suggest that post-exercise massage helps with the soreness of DOMS[50][51], though the mechanisms are unclear[52]. Studies that give massage 2-3 hours after DOMS inducing exercise showed reduced soreness[53][54][55], but not weakness[54][55]. One study that gave massage 2 days after exercise that resulted in reduced soreness and improved muscle function[56], but other studies that use massage 24 hours or more after exercise showed no benefit[57][58]. Therefore it seems likely that the timing of the massage is important, though other factors, such as the style of massage and the extent of the DOMS may also change the outcome.

5.5 Compression Clothing

Main article: Why compression clothes

Studies show that wearing Graduated Compression Clothing during the days after DOMS inducing exercise mitigates the soreness[59][60][61][62][63][64][65] and weakness[60][62][63] of DOMS. Relatively few studies showed no benefit from compression clothing[66][67]. However, the results of compression clothing are likely to vary with the particular garment, how well it fits and therefore the pressure that is provided[68]. No studies were found that looked at the effect of wearing compression clothing during DOMS inducing exercise on the subsequent recovery.

5.6 Warmup

Main article: Warmup

Performing a Warmup before exercise may help reduce DOMS pain[69][70], but not all studies support this[71].

5.7 Light Exercise

Light training in the days following DOMS inducing exercise generally accepted to be one of the most effective ways of reducing muscle soreness, but unfortunately the reduction in pain is temporary[72][73][10][9].

5.8 TENS

TENS may reduce the soreness of DOMS[74], but the effect seems to be transient[75] and the effect is reduced if combined with icing[76]. Not all studies show any pain reduction[77] and none show a reduction in the weakness.

5.9 Icing

Main article: Cryotherapy

Icing does not help[78][79][80][7], and can make DOMS worse[81][82]. Ice reduces pain slightly, but does not restore strength[76]

5.10 Antioxidants - Vitamin C and E

The evidence for anti-oxidants is mixed, with some studies showing a benefit but not others. Note that one study below showed an impaired recovery with vitamin C supplementation. In addition, there is mixed evidence that vitamin C and/or vitamin E reduces endurance adaptations from exercise[83][84][85] or they do not[86][87] [88].

Vitamin C Vitamin E Dose Period Result
3,000mg/day 14 days prior and 4 days post-exercise Vitamin C reduces soreness in first 24 hours[89]
3,000mg/day 3 days prior and 4 days post-exercise reduced soreness[90]
400mg/day 14 days prior to exercise reduced soreness[91]
3,000mg/day 3 days prior and 5 days post-exercise no effect[92]
1,000mg/day 2 hours prior and 4 days post-exercise no soreness change, but impaired strength recovery 7 and 14 days after exercise[93]
1,000mg 2 hours prior to exercise no effect[94]
400mg/day 12 days prior and 3 days post-exercise no change in soreness[95]
1,200 IU/day 30 days prior to exercise No effect[96]
500mg/day 1,200 IU/day 30 days prior and 7 days post-exercise improved muscle function but no change in soreness[97]
1,000mg/day 300 mg/d 6 weeks prior to exercise no change in function[98]

5.11 Stretching

Main article: Stretching

Stretching before[99][100] [101], after [100][102][103], or both before and after[104] exercise does not help with DOMS. In fact, stretching alone can induce DOMS[105].

5.12 NSAIDs

Main article: NSAIDs and Running

The most common NSAIDs (Ibuprofen, Acetaminophen (Paracetamol), and Aspirin) are unlikely to help with DOMS, but Naproxen may reduce the pain and weakness. If an NSAID is taken, it should probably be immediately after the damaging exercise rather than waiting until the soreness develops. It seems likely that taking an NSAID for DOMS will reduce the muscular growth that would normally occur as part of the recovery. In one disturbing study, rabbits treated with an NSAID (flurbiprofen) after DOMS inducing exercise initially recovered their strength after 3-7 days, but between days 7 and 28 days the rabbits became weaker while the untreated controls became stronger[106]. I have not included other animal studies, but this is the only one that looks at how NSAIDs impact the longer term recovery from DOMS.

NSAID Soreness Weakness
Ibuprofen 2xImproved[107][108]

7xNo Effect[109][110][70] [111][112][113][114]

 1xMaybe[107]

8xNo Effect[109][110][70] [111][112][113][108][114]

Ibuprofen Gel 1xNo Effect[115]
Acetaminophen (Paracetamol) 2xNo Effect[116][117]
Aspirin 2xImproved[118][119]

2xNo Effect[116][117]

 2xNo Effect[118][119]
Naproxen 4xImproved[120][121][122][123]

1xNo Effect[124]

 3xImproved[120][121][122]

1xNo Effect[124]

Diclofenac Possible slight reduction[125]
Codeine 1xNo Effect[116]
Rofecoxib 1xNo Effect[126]
Ketoprofen 1xImproved[127] 1xImproved[127]
Bromelain 1xNo Effect[114]

6 Mechanisms of DOMS

The underlying mechanism of DOMS is thought to consist of phases; the initial damage that occurs during the exercise and then secondary damage that occurs subsequently[9][10]:

  • Primary damage. The initial damage is believed to be mechanical in nature, both on the contracting parts of the muscle (sarcomeres) and the supporting structures (primarily the z-bands). While there are some suggestions that the primary damage might be due to metabolic factors such as low blood flow, low oxygen saturation, impaired metabolite clearance, these causes are not well supported. The idea that DOMS is caused by lactic acid has been rejected[128].
  • Secondary damage. The secondary damage appears to be initiated by the disruption of the intracellular Ca2+homeostatis, which leads to further myofibrillar damage including degradation of the cell membrane.

6.1 Mechanisms for the Repeated Bout Effect

For those interested in the details, there are several possible mechanisms that might be responsible for the Repeated Bout Effect (RBE)[129][130]:

  • Neural adaptation. The RBE may be due to changes in the way muscles are recruited. While there is some direct evidence that RBE occurs without neural adaptations, it is possible that this mechanism contributes to the protection.
    • Increased recruitment of slow-twitch fibers. Fast-twitch fibers may be more susceptible to eccentric damage, so an adaptation to recruit more slow-twitch fibers might reduce DOMS.
    • Activation of more muscle fibers. Recruiting a larger number of fibers may reduce the eccentric stress on each fiber, thus reducing the damage.
  • Mechanical adaptation. It is possible to consider muscle damage as similar to materials fatigue. These adaptations are in the non-contracting structures of the muscles. For instance, protection from damage could come from increased structural strength in the z-band of the muscles which get disturbed by eccentric exercise as seen above.
    • Increased dynamic muscle stiffness. Dynamic stiffness refers to how stiff the muscles are when contracted.
    • Increased passive muscle stiffness. In contrast, passive stiffness is when the muscles are relaxed. It is unclear if increased passive stiffness protects against eccentric damage or actually exacerbates it.
  • Cellular adaptation. A number of changes at the cellular level may provide protection against eccentric damage.
    • Increased sarcomeres. The sarcomeres are part of the contracting mechanism of the muscles. The contraction of a muscle comes from parts of the sarcomere sliding over each other. One adaptation to eccentric exercise may be that the overlap in these sliding areas becomes larger.
    • Changed inflammation response. The delay in soreness is probably due to a delayed inflammatory response, so changes in that response could reduce the soreness. However, this would not reduce the immediate loss of strength.
    • Maintenance of Excitation-Contraction coupling. One reason for the loss of strength following eccentric exercise is that the nerve impulses (excitation) may result in less contraction. The decoupling could be due to lack of neural drive (perhaps due to pain), physical disruption of the contracting structures of the muscle, or a failure to activate those contracting structures.

7 See Also

8 References

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