
339 S.E.2d 570 (1986)
PILOT FREIGHT CARRIERS, INC.
v.
Robert Bruce REEVES.
Record No. 0878-85.
Court of Appeals of Virginia.
Argued November 19, 1985.
Decided February 4, 1986.
Mary Louise Kramer and S. Vernon Priddy, III (Sands, Anderson, Marks & Miller), Richmond, for appellant.
Dabney Overton, Jr., for appellee.
Present DUFF, BENTON and COLE, JJ.
COLE, Judge.
This appeal by Pilot Freight Carriers, Inc., the employer, raises two issues: (1) whether the finding of the Commission that Pilot had failed to prove a change in condition of the claimant, Robert Bruce Reeves, was justified from the evidence presented; *571 and (2) whether the temporary total award of the Commission should have been terminated since Reeves had not returned to work, but was operating his own trucking business. We find that credible evidence supports the findings of the Commission on both issues and affirm the decision of the Commission.
Reeves owned and operated a tractor/trailer unit and had a contract with Pilot. The agreement provided that Pilot would furnish loads of freight and Reeves would furnish the tractor/trailer unit and the driver, who was Reeves himself. Pilot paid Reeves a percentage of the proceeds received for a trip and also withheld taxes from the wages of the driver. On September 1, 1983, Reeves sustained a work related back injury when he twisted his back while attempting to chain down a load of pipe. Pilot accepted his claim as compensable and began making temporary total disability payments.
After September 1, 1983, Reeves, unable to drive himself, employed a driver to operate his tractor/trailer unit. Reeves testified, and it is not disputed, that when Dr. Chappell told him that for at least two years he would not be able to drive, he decided that he was too much in debt to sell out and could not stay in business with one truck and a driver. Accordingly, he purchased a second tractor/trailer in October of 1983. In January of 1984 he purchased a third tractor and refinanced all of the units, three tractors and two trailers, in one loan.
Shortly after the accident, Pilot cancelled its contract with Reeves, but he entered into a similar agreement with Huss, Incorporated. Reeves employed truck drivers to drive his two units and he supervised and managed the other aspects of the business. In 1982, when Reeves was operating and driving one truck, the business earned a profit of $158.00. However, in 1983 and 1984, he lost approximately $40,000.00 each year. He paid each driver from $1,500 to $3,000 per month to drive a tractor. Reeves withdrew from the business approximately $200 per week, which he used to buy gas for his personal car that was used to run business errands, to purchase business supplies, and to pay his eating expenses.
The employer filed an application for a hearing on October 9, 1984, alleging that Reeves was no longer disabled as a result of his September 1, 1983, accident, that he was operating his own trucking business, and that the temporary total award should be terminated or modified. The full Commission on June 4, 1985, dismissed the application and this appeal followed.
In support of its contention that Reeves was no longer disabled, Pilot submitted a report of Dr. Edward Chappell, Jr. dated September 24, 1984. Dr. Chappell, the treating physician and an orthopedist, examined Reeves on September 24, 1984, and reported essentially a normal examination and stated:
AP and lateral X-rays of the lumbar spine were taken which are equivocal for slight disc space narrowing at L-4, L-5 and L-5, S-1.
I have told Mr. Reeves that in my opinion any problem that he is currently experiencing is not a result of the 9/1/83 injury.
Reeves submitted a report by Dr. Neal I. Aronson dated October 25, 1984. He reported subjective complaints of back pain and diminished left ankle jerk. He stated in his report that:
I reviewed X-rays which revealed narrowing of L4-5 and L5-S1. I also reviewed a CAT scan which he brought which shows evidence of bulging discs at L5-S1, worse on the left than the right, midline bulge of significant size at L4-5 and a moderate bulge at L3-4.
It is my opinion that this patient may have had degenerative disc disease which was asymptomatic and was then definitely aggravated by a work injury. He is now intermittently incapacitated and the prognosis is guarded. The options include further conservative management, wearing of a corset and work restrictions on the one hand as opposed to myelography and possible surgical intervention.

*572 The latter would be considered elective at this time but the prognosis is guarded....
In an application for review of an award on the ground of a change in condition, the burden is on the party alleging such change to prove his allegations by a preponderance of the evidence. J.A. Jones Const. Co. v. Martin, 198 Va. 370, 373, 94 S.E.2d 202, 204 (1956).
In cases where there is conflicting medical evidence, the Supreme Court has established the rule as follows:
The general rule is that when an attending physician is positive in his diagnosis of a disease, great weight will be given by the courts to his opinion. However, when it appears ... that the diagnosis is shaded by doubt, and there is medical expert opinion contrary to the opinion of the attending physician, then the trier of the fact is left free to adopt that view which is most consistent with reason and justice.
McPeek v. P.W. & W. Coal Co., Inc., 210 Va. 185, 188, 169 S.E.2d 443, 445 (1969); Baltimore v. Benedict Coal Corp., 182 Va. 446, 453, 29 S.E.2d 234, 237-38 (1944); Bristol Builders' Supply Co. v. McReynolds, 157 Va. 468, 471, 162 S.E. 8, 9 (1932).
While Pilot accurately states the principles regarding medical expert testimony, we must disagree with its assertion that in this case no medical evidence conflicted with the testimony of the treating physician. Dr. Aronson's report stated that Reeves suffered a work related injury from which he had not yet recovered. Clearly, this conflicted with Dr. Chappell's opinion that any back problems Reeves is suffering is not a result of the accident of September 1, 1983. Given this conflict of medical expert opinions, it is for the Commission to determine the probative weight to be accorded such evidence. Having resolved the conflict in favor of Reeves on the basis of credible evidence, the finding by the Commission is binding on this Court on appeal.
The employer next contends that the claimant is no longer incapacitated as a result of the accident of September 1, 1983, because he has returned to work and is working full time as the owner and manager of a trucking business at wages in excess of the pre-injury amount, although admittedly he has not returned to work as a truck driver. In Sargent Electric Co. v. Woodall, 228 Va. 419, 323 S.E.2d 102 (1984), the contention was made that the Commission had authority under Code § 65.1-99 to make an award ending, diminishing or increasing the compensation previously awarded, but the Supreme Court stated that an employee's entitlement to benefits for partial incapacity is based upon "the difference between his average weekly wages before the injury and the average weekly wages he is able to earn thereafter." Id. at 425, 323 S.E.2d at 105; see Code § 65.1-55.
The degree of disability under Code § 65.1-55 is determined by comparing average weekly wages which the employee actually earns before the injury and the average weekly wages that he is able to earn after the injury. Professor Larson in his treatise on Workmen's Compensation Law comments upon this distinction as follows:
It is at once apparent that the two items in the comparison are not quite the same. Actual earnings are a relatively concrete quantity.... Earning capacity, however, is a more theoretical concept. It obviously does not mean actual earnings, since the legislature deliberately chose a different phrase for the post-injury earnings factor.... But the concept of wages he "is able" to earn cannot mean definite actual wages alone, especially in the absence of a fixed period of time within which post-injury wages are to be taken as controlling.
2 A. Larson, The Law of Workmen's Compensation, § 57.21 (1980).
Larson summarizes the problem of determining "wages he is able to earn thereafter" as follows:
In essence, the problem is one of tying earnings to a period of time.... Obviously we cannot take an arbitrary period *573 of, say, six months after the injury as conclusive, since for a multitude of reasons that period might be entirely nonrepresentative. On the other hand, we cannot wait out the rest of claimant's life to see what his average weekly wage loss ultimately turned out to be. The normal solution is to make the best possible estimate of future impairments of earnings, on the strength not only of actual post-injury earnings but of any other available clues.
It is uniformly held, therefore, without regard to statutory variations in the phrasing of the test, that a finding of disability may stand even when there is evidence of some actual post-injury earnings equaling or exceeding those received before the accident. The position may be best summarized by saying that actual post-injury earnings will create a presumption of earning capacity commensurate with them, but the presumption may be rebutted by evidence independently showing incapacity or explaining away the post-injury earnings as an unreliable basis for estimating capacity.
Id. at § 57.21.
In Compensation of Harris v. Saif Corp., 292 Or. 683, 642 P.2d 1147 (1982), the claimant made substantial earnings through real estate investments. The Supreme Court of Oregon held that his disability award could not be revoked or diminished solely on the basis of these earnings. The court held that under such circumstances, the claimant's (unscheduled) permanent total disability award could only be revoked or diminished upon a specific and express finding that he or she was presently able to regularly perform a gainful and suitable occupation and noted that a claimant's ability to generate income is only relevant as it tends to establish his or her employability at some such occupation. A claimant's demonstrated ability to earn money is, in itself, insufficient. Id. at 693, 642 P.2d at 1153.
The Supreme Court of Virginia has stated that benefits awarded under former Code § 65-51 (now § 65.1-54) and former Code § 65-52 (now § 65.1-55) cover losses occasioned by the impairment of the claimant's earning capacity. The first section applies where the loss is total, and the second where it is partial. The extent of earning capacity must be ascertained from the evidence, and such is not limited to any special class of proof. All legal facts and circumstances surrounding the claim should properly be considered and due weight given them by the Commission. J. A. Foust Coal Co. v. Messer, 195 Va. 762, 766, 80 S.E.2d 533, 535 (1954).
It was the duty of the Commission to make the best possible estimate of future impairments of earnings from the evidence adduced at the hearing, and to determine the average weekly wage that Reeves was able to earn. This is a question of fact to be determined by the Commission which, if based on credible evidence, will not be disturbed on appeal. Jackson v. Loveland Distributing Co., 1 Va.App. 57, 58, 334 S.E.2d 148, 149 (1985) (per curiam). We believe that the record clearly supports the Commission's finding on this point. The Commission specifically stated that, "The supervisory work being performed by this claimant may have some value but there is no evidence before us in this regard." We agree with this finding.
We do not mean to imply that owning and operating a business can never be a sufficient reason to hold that the employee is presently able to return to work. Under the facts and circumstances of this case the evidence clearly shows that the employee is trying to rehabilitate himself, but at this time he is losing substantial sums of money in his business and is living on borrowed funds. The employer is unwilling to employ him and immediately cancelled its contract with him. Neither has it offered him any selective work under Code § 65.1-63 suitable to his capacity.
For the reasons stated, we find that the record in this case supports the findings of the Commission, and the opinion of the Commission is hereby affirmed.
Affirmed.
