Lyle W. Sherman

The research clinic, 1935 to 1961

Lyle Sherman ran the floor of the first instrumented chiropractic research clinic

Lyle W. Sherman was assistant director and chief of staff of the B.J. Palmer Chiropractic Clinic in Davenport, Iowa, from 1942. The clinic opened on August 5, 1935 and ran until B.J. Palmer died in 1961. Sherman ran the analysis, kept the instrument records, and made the daily decision about whether a patient would be adjusted at all.

The clinic was built in two complete divisions. A medical side took the case history, the physical examination and the laboratory work with standard medical equipment. A chiropractic side ran the spinographs, the thermal readings and the adjustment. Every case passed through both, and complete files were kept on each (Chiropractic Clinical Controlled Research, 1951, pp. 736 to 737).

What the B.J. Palmer Chiropractic Clinic measured on every case

Measurement in Sherman's clinic ran on a fixed schedule rather than on the doctor's impression of the day. Neurocalograph, neurocalometer and neurotempometer readings were taken daily. Vital signs and laboratory tests ran weekly. New spinographs were taken every two weeks, and a set of about ten X-ray studies existed by the time a patient left. Senzon's 2018 review of the period sets out that schedule from the clinic's own records.

The archive Sherman's staff produced

At least 7,000 cases were documented in the clinic between 1935 and 1960. Record keeping used 120 separate forms, and the average case file ran about 80 pages. B.J. Palmer put the gross average at 21.85 spinographs per case, taken as a check set every two weeks (1951, p. 30). By August 1951 the clinic held 203,824 graphs recorded inside its shielded booth (p. 14). Killinger's 1998 account describes the later project to preserve those files.

Pattern analysis

Sherman judged an adjustment by whether the pattern changed, not by how the patient felt

The reading came before the adjustment and again after it, on every case, every day. That sequence is the whole of pattern analysis. A new patient in Sherman's clinic was read for about three weeks under controlled conditions, until a stable graph emerged that belonged to that person. B.J. Palmer wrote that the pattern would not change until an adjustment was given (1951, p. 14).

The reading decided the day. The clinic's own instruction was blunt about it. The booth check readings are what you do or do not adjust upon, and upon them depends whether you under-adjust or over-adjust (p. 16). A patient could pass a day, or several days in a row, without being touched.

What the neurocalograph actually recorded

The instrument read a temperature difference rather than a bone. Paired probes ran down either side of the spine and reported asymmetry in skin temperature between left and right. Skin temperature is a readout of sympathetic control of the skin blood vessels, which makes the graph a surface window on the autonomic nervous system. Dossa Evins built the first version and brought it to B.J. Palmer in April 1923.

The two-point rule

Sherman's clinic set a numerical threshold for action. The instruction was to adjust only the subluxation carrying the major reading, and only when that reading came in at two points or more (1951, p. 574). Below two points the direction was explicit. Do not give an adjustment (p. 572). The threshold turned a judgment call into a stated criterion that a second examiner could apply to the same graph.

Over-adjusting was named as the clinic's principal danger

The 1951 volume lists three ways to over-adjust. Too many places in one spine at one time. One place too often, at times when no subluxation was present. One segment carried too far in any direction (p. 574). Each error has its own signature in the record. Carrying a segment too far reverses the reading, so a case that arrived reading two points left and returned reading two points right had been pushed past the correction.

Cycles of correction

Sherman's clinic waited for the heat pattern to come back and hold before adjusting again

The return of the pattern was not by itself a reason to adjust. The pattern had to return and stay returned. The 1951 case records name the phenomenon. After an adjustment the consistent graph is broken, and the variation that follows over the next days was called a cycle of correction (p. 369).

Restraint follows from that reading. At the first return of evidence of nerve interference the clinic usually did not re-adjust, on the reasoning that the muscles of the spine had to finish the work themselves (p. 451). An adjustment given inside the cycle was described as seldom justified (p. 437). That restraint is the center of Sherman's contribution.

The one exception Sherman's clinic allowed

A single class of event overrode the waiting rule. A fall, a jar or a fast movement of the head was taken as a mechanical reason for the pattern to come back, and a return after such an event was adjusted (1951, p. 451). Absent an injury, the instruction was that considerable time should pass before re-adjusting (p. 369).

What the restraint cost in adjustments delivered

The clinic's own arithmetic shows how rarely the criterion was met. Records from the research period gave one vertebral subluxation adjusted once every 23.9 days (1951, p. 344). A standard stay ran two weeks, and a patient could leave having received one adjustment inside it (p. 473). Sherman's clinic held people out of adjustment for most of the time they were in it.

Sherman appears in the case files by name

The 1951 records carry Sherman as a working clinician. A mother described bringing her son to Davenport in August 1945 and meeting Doctor Palmer and Doctor Sherman (p. 467). Another family addressed its follow-up letter to Dr. L. W. Sherman twenty-seven months after discharge. The letter records that Sherman had advised the patient to wait rather than proceed with a scheduled operation (p. 474).

Instrumentation

Sherman built the fixtures that made one reading comparable to the next

Sherman's engineering is the reason the clinic's graphs could be compared at all. He is credited with work on the neurotempometer, the neurocalograph and the cervical X-ray chair, and with a large part in the development of pattern analysis. Hart's 1996 memorial in Chiropractic History describes him as a published author and co-developer of chiropractic instruments.

The problem the instruments solved was the operator. Speed of travel down the spine changed the result. Read fast and a mean line came out as a break, read slow and a break came out as a mean line (1951, p. 13). The neurotempometer fixed a normal speed of travel and forced the probes level and square to the neck. Sherman standardized the examiner, not the patient.

The shielded booth removed the rest of the noise

Sherman's clinic recorded inside a grounded and shielded booth built to exclude outside fields, after finding that radio band and electrical waves moved the readings enough to show in the calibration (1951, pp. 13 to 14). A staff member was posted at the door to ground each patient on the way in. The clinic counted 22 major variables that had to be excluded before a graph could be trusted.

The 1949 test that showed the human eye could not do the job

Clay Thompson brought a device called the visograph to the 1949 Pre-Lyceum class at Palmer. It reproduced a neurocalometer needle at auditorium scale, synchronized to a crayon trace hidden behind the board. Doctors watched the needle, drew what they saw, then compared their drawing with the original. Very few produced one accurate drawing (1951, pp. 15 to 16). That result is why Sherman's clinic recorded graphs instead of impressions.

What modern reliability studies found when they tested the same measurement

The measurement Sherman standardized has since been tested directly. Owens and colleagues reported intraexaminer reliability of 0.953 to 0.984 and interexaminer reliability of 0.918 to 0.975 for paraspinal thermal scans in 2004. McCoy and colleagues reported intraclass correlations of 0.959 to 0.976 across 100 subjects in 2011. Interpretation is the weaker link. Mansholt and colleagues in 2015 found agreement of 0.73 for a full pattern and 0.05 to 0.22 for partial ones among 17 examiners.

That split is what the evidence says about Sherman's method. The instrument reproduces. Reading a pattern off the instrument is a trained judgment, and it agrees best at the extremes. Sherman's two-point threshold and his full-pattern-or-nothing rule were both attempts to keep the decision at the end of the scale where examiners agree.

The Truscott test, 1945

Sherman was the man the clinic sent when an outside claim needed checking

In July 1945 the Palmer clinic put an outside analytical system through a test, and Sherman ran it. Sherman and Don Pharaoh took the Truscott System course on July 21, 22 and 23, then reported to B.J. Palmer in a conversation printed in Fight to Climb (1950, pp. 245 to 248). The system claimed that light contacts at the upper neck changed the relative length of the legs.

Sherman's report separated two questions that are easy to run together. He said plainly that some of the physiological reactions the system claimed do take place, because he had checked them on different individuals. He added that he did not know whether the leg length change carried any analytical value (p. 245).

Sherman's objection was about time

The sharpest line in Sherman's 1945 report is a verification objection. He noted that adjusting a sixth dorsal temporarily leveled the legs, and that the legs pulled back as soon as the subject stood and walked. They have never tried waiting and seeing what would happen over a period of time, he told the room (Fight to Climb, 1950, p. 247). A change that does not survive time is not a correction.

The clinic then ran the claim against its own controls

On July 28, 1945 the clinic called in eight test cases and reproduced the leg change while breaking every condition the system required. Subjects were tested inside the shielded and grounded booth, wearing rings and watches, lying face up. Pressure at the femoral tubercles alone changed leg length in seven of the eight, with no contact made at the neck (1950, pp. 254 to 255). Twenty students were tested two days later.

The design matters more than the verdict

The Davenport tests were small and unblinded, so the counts carry little weight now. The design carries a great deal. B.J. Palmer wrote out numbered experiments and addressed them to Sherman and Pharaoh by name over four consecutive days, each one removing a condition the claim depended on (1950, pp. 252 to 254). That is a control series, run inside a chiropractic clinic in 1945, on a technique the clinic had no stake in.

The published record, 1949 to 1951

Sherman's name is on the clinic's published research, and those documents are case series

The B.J. Palmer Chiropractic Clinic issued bulletins whose titles named their case counts. Hematological Changes Under Specific Chiropractic Adjustment reported on 1,054 cases and carries B.J. Palmer, L.W. Sherman and W.W. Coulter as its authors, published by the Palmer School of Chiropractic around 1949. A companion bulletin on urological change reported 2,006 cases in 1949. A third covered basal metabolic change in 909 cases.

Sherman was the man who presented that work to the field. Speaking to the Chiropractic Society of Iowa in 1950, W. Heath Quigley pointed his audience at the clinic's new books on hematology and urology and said that Dr. Sherman would tell them about the research (Fight to Climb, 1950, p. 546).

What those documents are

They are uncontrolled case series with before and after laboratory values, published by the institution that produced them. None of them carries a control group, randomization or blinding. The first bulletin describes itself as number one in a series of experiments proving the effectiveness of specific chiropractic technic, which states the intent on the cover. Senzon lists the objectives printed in the urological pamphlet, one of which was to prove the subluxation exists.

What they can carry and what they cannot

The outcome numbers in these bulletins cannot bear the weight a controlled trial would carry, and nothing on this page rests on them. What survives is the protocol. Senzon's review of the 1928 to 1949 research era reaches the same conclusion. The work of that period had real limits and is still not worthless, because the systems of analysis built then became the foundation of modern practice.

Why Sherman's protocol outran his data

Sherman's clinic did four things that clinical research now takes as standard. It defined an objective measure. It recorded that measure before the intervention and again after it. It set a numerical threshold for acting. It treated a non-response as information rather than as a reason to push harder. The outcome data from 1949 has not aged well. The decision rule has.

Tone in Sherman's work

Sherman's contribution to tone is verification

Sherman's clinic ran on a claim the Unified Model of Tone now states outright. The effect of an input is decided by the state it arrives at. The same adjustment delivered to a system that is settling and to a system that is holding a fixed pattern is, in the strict biological sense, two different events. Sherman's answer was to read the state before the input and again afterward, from 1942.

Tone is the organizing state of the nervous system, and it can be read before the outcome is known. The thermal graph is one such reading. It reports asymmetry in sympathetic control of the skin vessels, which is a direct measure of autonomic output. Heart rate variability is a second reading of the same variable, taken at the heart instead of the skin.

Readiness is a state, and Sherman treated it as one

The clinic's rule was that a stable, reproducing pattern licenses an input and an unstable one does not. In the model's terms that is readiness. A system in the middle of reorganizing has already received its signal and is still using it. A second input inside that window competes with the first. Sherman reached the rule from graphs, and the model states it as the reason input quality outranks force.

The cycle of correction is time course, named in 1951

Sherman's cycle of correction is time course seen from inside a clinic. A response to an input is a trajectory rather than a step, and one reading taken immediately afterward says almost nothing about where the system will settle. Sherman's staff learned that by watching graphs move for days after a single adjustment. The model takes the same position. The interval over which a system returns to baseline is part of the measurement.

Where the Unified Model of Tone parts from Sherman's clinic

The clinic held that a subluxation can exist only at the atlas or the axis, and adjusted nowhere else from 1935 until the mid-1950s. The model holds that a body carries several points of critical tension at once, and that the reach of each one shifts with the system's state from week to week. There is no single lynchpin waiting to be found. What the model keeps from Sherman without revision is the sequence. Read the system, act only on a stated criterion, then read it again.

The instrument line runs forward from Sherman

The thermal instruments used in upper cervical practice today descend from the ones Sherman standardized after 1942. Toftness Technique carried the detection idea into a correction delivered in ounces. The H.I.O. Knee Chest page sets out the anatomy, the toggle recoil and the modern procedure the clinic used. Evins built the first neurocalometer, and Sherman is the reason its output became comparable from one day to the next.

The dated record

Eight dated facts about Lyle Sherman, with the source for each

1905 to 1942

1905. Lyle Wheeler Sherman was born on February 22 at Gilson, Knox County, Illinois, according to his Find a Grave memorial. Sherman College records that he came to chiropractic through his wife, whose health improved under care.

1942. Sherman became second in command at the B.J. Palmer Chiropractic Clinic, seven years after it opened, with the title of assistant director and chief of staff.

1945 to 1955

1945. Sherman ran the Palmer clinic's evaluation of the Truscott System and took the course in July. He reported that its physiological effects were real and its analytical value unproven (Fight to Climb, 1950, pp. 245 to 248).

1949. The clinic published Hematological Changes Under Specific Chiropractic Adjustment on 1,054 cases, with Sherman named as an author alongside B.J. Palmer and W.W. Coulter.

1954. Sherman wrote a piece titled Chiropractic equipment reaches Ethiopia for the October issue of the ICA International Review of Chiropractic, page 11, recorded in Keating's chronology of B.J. Palmer. In the same year Sherman left Davenport for Spartanburg, South Carolina.

1955. The International Chiropractors Association named Sherman its Chiropractor of the Year. He sat on the ICA Board of Control during B.J. Palmer's presidency.

1973 to 1977

1973. Thom Gelardi founded a chiropractic college in Spartanburg and named it for his mentor. Sherman College of Chiropractic was the first chiropractic college in the southeastern United States, and Sherman chaired its board of trustees from 1973 until his death. Its first class graduated on September 18, 1976, the anniversary of the first chiropractic adjustment.

1977. Sherman died in August at Spartanburg at the age of 72, and is buried at Greenlawn Memorial Gardens there.

The library web

Where Sherman's line runs in this library

B.J. Palmer built the clinic Sherman ran and set the rule it enforced from 1935. Dossa Evins built the instrument that turned interference into a reading. H.I.O. Knee Chest carries the anatomy and the procedure. Toftness Technique carries the detection idea into a low force correction.

Tone states the variable the clinic's graphs were tracking. The autonomic nervous system explains why skin temperature reports on it. Time course explains the cycle of correction, and input quality explains why the clinic adjusted so rarely. The Legends collects the people who built the profession, and the Unified Model of Tone carries the whole argument with the measurements attached.