Trigger points exhibit sustained spontaneous needle-EMG activity at a millimeter-scale nidus, more prevalent there than at non-tender sites within the same endplate zone and absent at taut-band sites outside the endplate zone.

Peer-reviewed, replicated as spontaneous electrical activity in later literature, generator contested, no vascular content — a real but aging observation carrying more of this case than it should.

Early 1990s studies detected localized spontaneous EMG activity confined to a millimeter-scale nidus at trigger points, demonstrating an island of ongoing electrical activity. This has been replicated as a general phenomenon in the literature. However, the strongest opposing consideration is that the recorded signal is entirely skeletal-muscle electrophysiology—such as endplate noise or spindle discharge—providing no direct evidence for a vascular mechanism.

The presence of sustained spontaneous needle-EMG activity confined to a small nidus at trigger points is supported by Hubbard & Berkoff (VASO-E001), with later literature referring to similar signals as “spontaneous electrical activity.” This provides evidence that certain tender sites are maintained as localized electromyographically active regions even at rest. The study is, however, small, from a single lineage, and the precise generator (endplate vs spindle) remains debated. The strongest opposing consideration is that the activity is clearly skeletal-muscle in origin, so it supports neuromuscular guarding explanations as well as any more exotic vascular-based model.

Hubbard and Berkoff 1993 (VASO-E001) recorded sustained spontaneous needle-EMG confined to a 1–2 mm nidus of trapezius trigger points and absent in adjacent non-tender fibers. The finding is peer-reviewed and later treated as spontaneous electrical activity, but the study is old, small, and single-lab, and the signal generator remains contested. Strongest opposing consideration: by every published interpretation the trace is skeletal-muscle electrophysiology (endplate noise or spindle discharge), not vascular smooth muscle, so using it as evidence for a vascular latch reads the result against its own literature.

E001 documents the Hubbard–Berkoff 1993 finding: sustained spontaneous EMG confined to a 1–2 mm nidus at trigger points, absent a centimeter away — peer-reviewed and, per the credibility record, replicated as "spontaneous electrical activity" in later trigger-point literature. The localized-activity observation is the robust residue; the generator (endplate potentials versus spindles) remains contested. The strongest opposing consideration is that the signal is skeletal-muscle electrophysiology by every published interpretation, so it supports guarding accounts as readily as vascular ones — taking it as evidence for a vascular mechanism reads it against its own literature. Old, small, and single-lineage origins keep this provisional.

E001 reports sustained spontaneous needle-EMG activity in a 1–2 mm nidus at all sampled trapezius trigger points and none in adjacent non-tender fibers, and the case notes the finding was echoed as "spontaneous electrical activity" in later trigger-point work, though no independent replication record is filed here. The strongest opposing consideration is that endplate noise is a recognized normal finding at motor endplate zones, so the signal may index proximity to endplates rather than a pathological nidus, and electrode placement was not blinded. The observation supports "something localized is electrically maintained" but is, by every published interpretation, skeletal-muscle rather than vascular electrophysiology.

Peer-reviewed and localized (VASO-E001), but a single aging lineage with a contested generator, and the signal is neuromuscular — it carries no vascular content.

Peer-reviewed and spatially localized (VASO-E001), but one aging lab lineage with a contested generator — and the signal is neuromuscular, not vascular. Unchanged.

Peer-reviewed and localized (VASO-E001), but one aging lab lineage with a contested generator, and the signal is neuromuscular, not vascular. Unchanged.

Peer-reviewed and spatially localized (VASO-E001), but a single aging lineage with a contested generator, and the signal is neuromuscular rather than vascular. Unchanged.

Peer-reviewed and spatially localized (VASO-E001), but a single aging lineage with a contested generator; the signal is neuromuscular, not vascular. Unchanged.

Peer-reviewed, millimeter-localized activity (VASO-E001), but one aging lineage with a contested generator, and the signal is neuromuscular rather than vascular. Unchanged.

Peer-reviewed and localized (VASO-E001), but one aging lineage with a contested generator, and the signal is neuromuscular, not vascular. Unchanged.

Peer-reviewed and localized (VASO-E001), but a single aging lineage with a contested generator; the signal is neuromuscular, not vascular. Unchanged.

Needle EMG studies consistently demonstrate spontaneous electrical activity localized to millimeter-scale niduses at trigger points, absent in adjacent tissue. The strongest limitation is that by every published interpretation, this signal reflects skeletal-muscle electrophysiology (motor endplate or muscle spindle activity), which natively supports conventional guarding accounts rather than a vascular smooth-muscle mechanism.

Hubbard and Berkoff (VASO-E001) report sustained spontaneous EMG activity confined to a 1–2 mm nidus at palpated trigger points, absent in adjacent non-tender tissue, which directly supports a localized, maintained neural signal associated with these sites. Later literature has generally replicated “spontaneous electrical activity,” albeit with debate over its precise origin. The strongest opposing consideration is that this is an old, small, single-lineage study, measuring skeletal- muscle electrophysiology rather than vascular processes, so it supports a maintained state but not specifically a vascular latch.

VASO-E001 reports sustained spontaneous needle-EMG in a 1–2 mm trapezius nidus of all sampled trigger points and none in adjacent non-tender fibers, which is direct support for a localized maintained electrical state. The study is old, small, and from one lab, and it is the only evidence record on this claim. Strongest opposing consideration: the recorded activity is skeletal-muscle electrophysiology by every interpretation in the record (endplate noise or spindle discharge), not smooth muscle, so it supports guarding as readily as any vascular reading and cannot be taken as evidence for latch.

Hubbard and Berkoff directly recorded sustained spontaneous needle-EMG activity in a 1–2 mm trigger-point nidus with adjacent non-tender fibers quiet (VASO-E001), and later literature reportedly replicated related “spontaneous electrical activity,” though this project did not independently verify that chain. The strongest opposing consideration is that the signal is skeletal-muscle electrophysiology by every published interpretation—endplate noise or spindle discharge—not smooth muscle, and the original study is old, small, and single-lineage. The finding therefore supports a maintained local state, but it does not discriminate vascular latch from guarding. A modern replication with simultaneous vasomotor measurement is still needed.

E001 reports sustained spontaneous needle-EMG activity in a 1–2 mm nidus at all trigger points examined and none in adjacent non-tender fibers, with amplitude gradients across patient groups — a genuine localized finding that survived into later trigger-point literature as "spontaneous electrical activity." The strongest opposing consideration is that the recorded signal is, on the dominant later interpretation, endplate noise, which occurs in normal muscle at motor endplate zones; if nidus-finding partly tracks endplate zones, the contrast with "adjacent muscle" is less impressive than it reads. The study is also 1993, small, single-lab, and measures nothing vascular, so its support for the featured hypothesis is limited to establishing that something localized is being maintained.

Peer-reviewed and localized (VASO-E001), but one aging lineage with a contested generator; the signal is neuromuscular, not vascular. Unchanged.

Peer-reviewed and spatially localized (VASO-E001), but a single aging lineage with a contested generator, and the signal is neuromuscular rather than vascular. Unchanged.

Early peer-reviewed studies successfully identified a millimeter-scale nidus of sustained spontaneous electrical activity at trigger points (VASO-E001). The strongest opposing consideration is that this signal is definitively recognized as skeletal-muscle electrophysiology (endplate potentials or spindle discharge), which supports a conventional neuromuscular guarding mechanism better than a vascular one.

Hubbard & Berkoff’s study (VASO-E001) reports sustained spontaneous needle-EMG activity confined to a 1–2 mm nidus within trapezius trigger points, absent in nearby non-tender muscle, and this pattern has been echoed as “spontaneous electrical activity” in later literature. This supports the claim that trigger points have a localized neural signature at rest, indicating maintained state rather than scar. Still, the sample is small, from a single lab, and the generator of the signal (endplates vs spindles) remains contested, with no vascular measurement taken. The strongest opposing consideration is that the observed EMG is clearly skeletal-muscle in origin, fitting neuromuscular guarding accounts at least as well as any vascular mechanism.

Hubbard and Berkoff 1993 (VASO-E001) recorded sustained spontaneous needle-EMG in a 1–2 mm trapezius nidus and none in adjacent non-tender fibers. The claim as stated is that measurement, and later trigger-point literature treats spontaneous electrical activity as a replicated sign, though this file does not import those replications as separate records. Strongest opposing consideration: the sample is old and small, the generator is contested (endplate potentials versus spindles), and by every published interpretation the signal is skeletal-muscle electrophysiology, so it supports guarding at least as readily as any vascular reading.

VASO-E001 is peer-reviewed and directly on point — sustained spontaneous activity confined to a 1–2 mm nidus, absent in adjacent non-tender muscle — and the claim record notes later replication as "spontaneous electrical activity" in the trigger-point literature. The study is nonetheless from 1993, small, and from a single lineage, and the signal's generator remains contested between endplate potentials and spindles. The strongest opposing consideration is that under every interpretation the activity is skeletal-muscle electrophysiology, so the finding supports guarding accounts as readily as vascular ones — reading it as evidence for a vascular mechanism reads it against its own literature. As a measurement claim (something localized is electrically maintained), it is provisionally supported.

E001 is a peer-reviewed direct measurement with an internal control — sustained spontaneous activity in a 1–2 mm nidus, absent in adjacent non-tender fibers — and the claims file reports that "spontaneous electrical activity" was picked up by later trigger-point literature, though no independent replication record appears in this file. The finding is genuinely awkward for pure examiner-artifact accounts, because a needle finds the signal where the finger said it would. The strongest opposing consideration is the generator: the signal is skeletal-muscle electrophysiology on every published interpretation, and the leading candidate is needle-provoked endplate potentials, which would make the "island of maintained activity" partly an artifact of the recording instrument rather than a resting property of the tissue.

Peer-reviewed, replicated as "spontaneous electrical activity" in later trigger-point literature, but old and small, and what generates the signal is contested — dysfunctional motor endplates and muscle spindles are the leading candidates, neither of which is a blood vessel.

Hubbard & Berkoff (1993) initially reported continuous, low-amplitude spontaneous electrical activity localized to the 1–2 mm trigger-point nidus. Simons et al. (2002) confirmed endplate noise at 100% of examined trigger points, but demonstrated that it is an endplate-zone phenomenon, occurring in 36% of non-tender endplate sites and completely absent outside the endplate zone. The strongest opposing consideration is that this electrical chatter reflects skeletal motor endplate dysfunction rather than any specific vascular smooth-muscle process.

Needle EMG studies demonstrate that spontaneous electrical noise is concentrated at the trigger point nidus (VASO-E001, VASO-E031). However, Simons et al. (VASO-E031, VASO-E032) qualify the exclusivity of this signature, showing that endplate noise is also present at non-tender sites within the motor endplate zone (4 of 11 sites), while completely absent outside the endplate zone. The strongest opposing consideration is that this electrical activity represents classic neuromuscular endplate dysfunction rather than a novel or vascular-specific generator.

Hubbard & Berkoff (1993) documented sustained spontaneous needle-EMG activity confined to trigger-point nidi, and Simons et al. (2002) confirmed endplate noise at 100% of trigger points versus 0% of taut bands outside endplate zones. However, Simons et al. also found this noise at 36% of non-tender endplate-zone sites, qualifying its exclusivity. The strongest opposing consideration is that endplate noise originates from dysfunctional skeletal neuromuscular junctions rather than intrafusal spindles or microvascular smooth muscle.

The claim is carefully worded to match exactly what the evidence shows: VASO-E001 finds nidus-confined spontaneous activity, and VASO-E031/E032 supply the precise prevalence gradient (11/11 trigger points, 4/11 non-tender endplate-zone sites, 0/11 off-zone taut-band sites). The strongest opposing consideration is that Hubbard–Berkoff's silent control sites may simply have lain off the endplate zone, and the signal's generator (endplate vs spindle) remains contested — but the claim as stated survives both.

Hubbard & Berkoff 1993 found sustained spontaneous activity in the nidus of all recorded trigger points and not in adjacent non-tender fibers (VASO-E001), and the refined claim's prevalence-gradient phrasing matches Simons 2002 directly: endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites, and 0/11 off-zone taut-band sites (VASO-E031, VASO-E032). The strongest opposing consideration is that Simons 2002 shows the signature is characteristic of but not restricted to trigger points, so the exclusivity implied by Hubbard–Berkoff's controls likely reflects off-zone control placement — the signal is endplate-zone-linked first; also the key studies are old, small, unblinded, and abstract-only for the Simons arm.

VASO-E001 gives the core finding and VASO-E031/E032 supply the exact comparators the claim's careful phrasing requires: 11/11 at trigger points, 4/11 at non-tender endplate-zone sites, 0/11 off-zone taut bands. The strongest opposing consideration is that both studies are small, one lineage dominates, the generator (endplate vs spindle) is contested, and Simons 2002 was unblinded — the prevalence gradient holds, but the "addressable nidus" reading is weaker than first appears.

VASO-E001 reports sustained spontaneous activity in a 1–2 mm trigger-point nidus, and VASO-E031/E032 report the specified prevalence ordering across trigger-point, matched endplate-zone, and off-zone taut-band sites. Together they support the claim's detailed electrophysiological pattern. The strongest opposing consideration is that the studies are small, old, unblinded or from one proponent lineage, and activity at four of eleven non-tender endplate-zone sites shows that the signal is not trigger-point-specific.

VASO-E001 supports sustained spontaneous activity in a 1–2 mm trigger-point nidus, and VASO-E031–E032 show a prevalence gradient from trigger-point sites to non-tender endplate-zone sites to off-zone taut-band sites. This supports enrichment at the nidus rather than exclusivity to it. The strongest opposing consideration is that the matched study was small, nonrandomized, and unblinded, and its findings indicate that endplate location itself explains part of the signature.

VASO-E001 reports sustained activity at a millimeter-scale nidus, and VASO-E031 records a prevalence gradient of 11 of 11 trigger-point sites, 4 of 11 non-trigger endplate-zone sites, and no off-zone taut-band sites. Together these support the claim's localization and comparative prevalence rather than absolute exclusivity. The strongest opposing consideration is that the small, old, unblinded studies do not form an independent modern replication, and the signal may primarily identify motor endplate zones.

Hubbard & Berkoff recorded sustained spontaneous activity in the 1–2 mm nidus absent from adjacent non-tender fibers; Simons 2002 confirms higher prevalence at trigger points than at non-tender endplate-zone sites and absence from off-zone taut-band sites. The original controls were not endplate-matched, so exclusivity is overstated, but the prevalence gradient holds. Strongest opposing consideration is that the generator remains contested (endplate potentials versus spindles) and the signal is skeletal, not vascular.

Hubbard & Berkoff 1993 recorded sustained spontaneous activity in the 1–2 mm nidus of all tested trigger points and none in adjacent non-tender fibers (E001). Simons et al. 2002 qualify exclusivity: endplate noise also occurs at some non-tender endplate-zone sites, though at lower prevalence, and never in taut-band sites outside the endplate zone (E031, E032). The gradient “more prevalent at trigger points” survives. Strongest opposing consideration is that the silent controls in the 1993 study may simply have lain off the endplate zone.

Hubbard & Berkoff 1993 found sustained spontaneous needle-EMG in the 1–2 mm nidus of all trapezius TPs and none in adjacent non-tender fibers. Simons, Hong & Simons 2002 qualify exclusivity: endplate noise also occurs at some non-tender endplate-zone sites (4/11), though at lower prevalence, and not in taut bands off the zone — so the signature tracks endplate zone first and TP second. Strongest opposing consideration: the generator may be ordinary endplate potentials under sympathetic drive, not a distinct vascular-linked nidus.

As restated here the claim already incorporates the Simons qualification and matches the data well: Hubbard & Berkoff found sustained spontaneous activity in a 1–2 mm nidus of every trigger point examined (VASO-E001), and Simons, Hong & Simons found endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites and 0/11 off-zone taut-band sites (VASO-E031, VASO-E032). Two labs converge on a prevalence gradient. The strongest opposing considerations are that both studies are small, old and unblinded, that Simons and Hong are avowed proponents of the construct, that the abstract alone was available to the extractor, and that the signal's generator remains contested — the finding that noise tracks the endplate zone first supports a conventional neuromuscular account and is electrically silent about vasculature.

As worded the claim matches Simons, Hong and Simons 2002 rather than overstating exclusivity: VASO-E032 records endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites, and 0/11 off-zone taut-band sites, and VASO-E001 records the original nidus finding. The prevalence gradient is real. Against it: both studies come from the same small proponent lineage, the 2002 design is self-described as nonrandomized and unblinded with 10 subjects, only the abstract was read, and no independent modern replication is recorded. The finding is skeletal-muscle electrophysiology and is neutral between the endplate and vascular readings.

As now worded — sustained spontaneous activity at a millimetre nidus, more prevalent there than at non-tender endplate-zone sites, absent at off-zone taut-band sites — the claim matches VASO-E032's reported gradient (11/11 versus 4/11 versus 0/11, p = 0.024 and p = 0.000034) and is consistent with VASO-E001. VASO-E031 removes the stronger exclusivity reading the case once leaned on. The strongest opposing consideration is provenance and technique: both supporting studies are small, one is explicitly nonrandomised and unblinded with ten subjects, the authors are the construct's leading proponents, and endplate-noise detection is notoriously dependent on needle placement, so a prevalence gradient could partly reflect search effort at sites the examiner already believes abnormal. Nothing here is vascular.

VASO-E001 (moderate): needle EMG from trapezius trigger points and adjacent non-tender fibers found sustained spontaneous activity confined to a 1–2 mm nidus and none in non-tender sites. Single 1993 study, one laboratory, small; the signal's generator is contested (spindles vs endplate potentials); never replicated with modern instrumentation.

Hubbard and Berkoff (VASO-E001, moderate) found sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers. Simons, Hong and Simons (VASO-E031, moderate, qualifying) found endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites, and 0/11 taut-band sites off the endplate zone, concluding the signature is characteristic of but not restricted to the trigger point. The claim as stated — more prevalent at trigger points than at endplate-zone controls, absent off-zone — is what both records together support. Both studies are small, old, from proponent lineages, and the Simons design was unblinded; neither measured vasculature.

Hubbard and Berkoff recorded sustained activity in the nidus of every trigger point and none at adjacent non-tender fibers (VASO-E001, moderate). Simons 2002 qualifies exclusivity: endplate noise appeared at 4 of 11 non-tender endplate-zone sites and never at taut-band sites off the zone (VASO-E031), which is why the claim is stated as a prevalence gradient. The essay's restatement (VASO-E043) is derivative. Both primaries are small, old, and from proponent lineages; the generator is contested and is skeletal electrophysiology throughout.

VASO-E001 moderate (nidus in every trigger point, none in adjacent non-tender fibers); VASO-E031 qualifies and VASO-E032 supports the gradient (11/11 trigger-point sites, 4/11 non-tender endplate-zone sites, 0 off-zone taut-band sites); VASO-E043 weak derivative; VASO-E052 cross-species context from an unverified source. The signature lives in the endplate zone first and at the trigger point second.

VASO-E001 (moderate, supports): sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers. VASO-E031 (moderate, qualifies): endplate noise at 4 of 11 non-tender endplate-zone sites and never off the endplate zone — characteristic of, not restricted to, trigger points. VASO-E043 restates E001; VASO-E052 rests on an unread source and is treated as absent. The claim as worded — more prevalent, not exclusive — is what the two records jointly show.

Hubbard and Berkoff recorded sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers (VASO-E001). Simons 2002 qualifies the exclusivity: endplate noise appeared at four of eleven non-tender endplate-zone sites and never off the zone, making the signature a prevalence gradient (VASO-E031). Essay restatements (VASO-E043, VASO-E052) add no weight.

Sustained spontaneous activity in a 1–2 mm nidus of every trigger point and none in adjacent non-tender fibers (VASO-E001, moderate). Simons 2002 qualifies exclusivity: endplate noise at four of eleven non-tender endplate-zone sites and never off the zone (VASO-E031), so the claim as worded — more prevalent at trigger points within the zone, absent outside it — is what survives. The essay's restatement (VASO-E043) and the equine cross-species note (VASO-E052, unread source) add no weight.

Hubbard & Berkoff recorded sustained activity in the nidus of every trigger point and none at adjacent non-tender sites (VASO-E001, moderate); Simons 2002 qualifies exclusivity — endplate noise at four of eleven non-tender endplate-zone sites and none off the zone (VASO-E031) — so the claim as stated (a prevalence gradient) is what the two together support. The essay's restatement (VASO-E043) and the equine cross-species note (VASO-E052, unread source) add no weight.

Sustained spontaneous EMG in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers (VASO-E001, moderate), qualified by Simons 2002: endplate noise also at four of eleven non-tender endplate-zone sites and never off the zone (VASO-E031), so the claim's gradient wording stands and exclusivity does not. VASO-E043 is the essay's restatement; VASO-E052 comes from an unread source and is treated as absent.

Hubbard and Berkoff found sustained activity in the nidus and none in adjacent non-tender fibres (VASO-E001); Simons 2002 qualifies exclusivity — endplate noise at 4 of 11 non-tender endplate-zone sites, none off the zone (VASO-E031). The claim is stated as the resulting prevalence gradient. VASO-E043 is a derivative restatement; VASO-E052 (equine EMG) is context from an unread source.

Sustained spontaneous activity was found in the nidus of every trigger point and not in adjacent non-tender fibers (VASO-E001), but endplate noise also appears at four of eleven non-tender endplate-zone sites and never off the zone (VASO-E031), so the signature is a prevalence gradient. VASO-E043 is derivative; VASO-E052 rests on an unread source.

Hubbard and Berkoff recorded sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibres (VASO-E001); Simons, Hong and Simons found endplate noise at 11 of 11 trigger-point sites, 4 of 11 non-tender endplate-zone sites and 0 of 11 off-zone taut-band sites (VASO-E031, qualifies), making the signature a prevalence gradient rather than an exclusive island. The essay restatement (VASO-E043) and the equine parallel from an unread source (VASO-E052) carry no independent weight. Old, small, one lineage each, abstract-only for Simons.

Hubbard and Berkoff recorded sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers (VASO-E001, moderate). Simons 2002 qualifies exclusivity: endplate noise appeared at all 11 trigger-point sites, at 4 of 11 non-tender endplate-zone sites, and at no off-zone taut-band site (VASO-E031), so the claim is graded as the prevalence gradient it now states. The essay's restatement (VASO-E043) and the equine parallel from the unread second essay (VASO-E052) carry no independent weight.

Hubbard and Berkoff (VASO-E001, moderate) recorded sustained spontaneous activity in a 1–2 mm nidus of every trapezius trigger point and none in adjacent non-tender fibers. Simons 2002 (VASO-E031, qualifies) found endplate noise at all eleven trigger-point sites, at four of eleven non-tender endplate-zone sites, and at none of the taut-band sites off the zone, so the signature is a prevalence gradient rather than an exclusive island, as the claim now states. The essay's restatement (VASO-E043) and the equine background from an unread source (VASO-E052) add no weight. Small, old, one lineage, unblinded.

Hubbard & Berkoff 1993 (VASO-E001) first demonstrated spontaneous needle-EMG activity localized to a 1–2 mm nidus at trigger points. This was rigorously refined by Simons, Hong & Simons 2002 (VASO-E031, VASO-E032), who confirmed that endplate noise occurred in 11/11 trigger-point sites, in 4/11 non-tender endplate-zone sites, and in 0/11 taut-band sites outside the endplate zone, matching the exact prevalence gradient stated in the claim. The strongest opposing consideration is that this electrical activity is neuromuscular (extra-fusal endplate noise or spindle potentials) rather than vascular smooth-muscle electrophysiology.

The claim as stated already incorporates the correct qualification, and the prevalence gradient is measured: endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites, and 0/11 off-zone taut-band sites (E031, E032), plus Hubbard-Berkoff's nidus-confined signal (E001). The strongest opposing considerations are the small, unblinded designs, abstract-only sourcing, and the still-contested generator (endplate potentials versus spindles); nothing measures vasculature here.

VASO-E001 supports sustained activity in a millimeter-scale trigger-point nidus, and VASO-E031 reports a prevalence gradient of endplate noise from trigger-point sites to non-tender endplate-zone sites to off-zone taut-band sites. Together they closely match the claim, but the studies are small, old, unblinded or incompletely reported, and arise from a limited research lineage. The strongest opposing consideration is that activity at non-tender endplate-zone sites indicates an endplate phenomenon rather than a signature unique to knots.

Hubbard & Berkoff 1993 (E001) found sustained spontaneous activity in the 1–2 mm nidus of all TPs and none in adjacent non-tender fibers. Simons 2002 (E031) shows endplate noise also at 4/11 non-tender endplate-zone sites and never off-zone, so the signature tracks endplate zone first and TP second; exclusivity fails. Strongest opposing consideration is that the generator is conventional skeletal (endplate potentials) rather than vascular or spindle.

The claim is worded to match Simons, Hong and Simons 2002, which found endplate noise at 11/11 trigger-point sites, 4/11 non-tender endplate-zone sites and 0/11 taut-band sites outside the zone (E031, E032). The nidus finding of Hubbard and Berkoff 1993 (E001) agrees, while the essay and equine records (E043, E052) add nothing independent. Two lineages agree on the gradient, but both are small proponent studies. Simons 2002 was nonrandomized and unblinded and is held only as an abstract, and the "sustained" and "millimeter-scale" details come from Hubbard and Berkoff, whose non-tender controls were not matched for endplate zone. Strongest opposing consideration: the signal tracks the motor endplate zone first and the trigger point second, and endplate noise is a recognised feature of normal endplates (general electrophysiology). Unblinded needle placement could therefore produce the prevalence gradient, and either way the signature is neuromuscular, not vascular.

Hubbard and Berkoff found sustained activity in a 1–2 mm nidus at every trigger point and none at non-tender sites (VASO-E001). Simons 2002 (VASO-E031) found the noise at 11/11 trigger points, 4/11 non-tender endplate-zone sites and 0/11 off-zone taut bands, turning an island into a gradient. The studies are small, old and unblinded, with proponent authors. The essay restatements (VASO-E043, VASO-E052) carry no weight.