ORDER
On consideration of Appellees’ motion for reconsideration, filed on July 1, 1994, treated by this court as a petition for rehearing,
IT IS ORDERED:
1. Opimon No. 4097 published on July 1, 1994, is WITHDRAWN.
2. The petition for rehearing is GRANTED.
3. Opinion No. 4119 is issued on tMs date in its place.
Entered by direction of the Court at Anchorage, Alaska, on September 9, 1994.
Before MOORE, C.J., RABINOWITZ, MATTHEWS and COMPTON, JJ., and BRYNER, J. Pro Tern.*
OPINION
COMPTON, Justice.
Norcon, Inc. and its workers’ compensation carrier, Eagle Pacific Insurance Co. (Norcon), appeal fi’om a superior court decision affirming an Alaska Workers’ Compensation Board (Board) determination that Kenneth Siebert’s sudden cardiac death was work related. We reverse.
I. FACTUAL AND PROCEDURAL BACKGROUND
Kenneth Siebert was hired by Norcon in June 1989 as a crane operator in connection with the Exxon Valdez oil spill cleanup. He would pick up dumpsters with a crane and empty their contents into a containment pit. The job was temporary and scheduled to end in the fall. Originally Kenneth was hired for eight weeks on and two weeks off. However, he worked seven days a week, twelve hours a day, without any vacations.
During his employment with Norcon, Kenneth resided in a “man camp” wMch was located approximately four and one half miles from Valdez. There was conflicting testimony eoncermng the amount of rest and relaxation time available to Kenneth. According to Ellen Siebert, Kenneth’s wife, Kenneth believed that he would not be hired back if he took any time off for rest and relaxation. Mr. Gene Fontenot, Norcon’s superintendent of support services, testified that rest and relaxation was offered to everyone, and that if someone did not take some after eight weeks, he or she was encouraged to do so. Ellen testified that Kenneth told her on occasion that he was very tired, but that he wanted to stay on until the job wound down. Kenneth’s roommate, Robert Netherton, testified that although Kenneth complained occasionally of being tired, he did not do so any more than anyone else. He further testified that Kenneth never indicated to him that he was exhausted, nor did Kenneth appear as if he was exhausted.
On the mormng of September 29, 1989, Kenneth got up, showered, shaved, and exchanged pleasantries with Netherton, who [1053]*1053remained in bed. A short time later Nether-ton heard a thud. He rolled over in bed and saw that Kenneth was on the floor. Kenneth apparently suffered ventricular fibrillation, which resulted in sudden cardiac death. Emergency medical technicians succeeded in restoring his heart beat. However, Kenneth did not regain consciousness. He remained in a coma until he died in December 1989.
Kenneth was fifty-seven years old. He was a light drinker and had smoked cigarettes. Ellen testified that Kenneth had not seen a doctor in twenty years or more. No autopsy was performed.
In January 1990, Norcon filed a report of occupational injury with the Board. Nor-con’s representative filed a notice of contr-oversion. Later Ellen filed an application for adjustment of claim. Norcon filed an answer denying entitlement to benefits. Eventually the Board issued a decision and order finding that Kenneth’s death was compensable under the Alaska Workers’ Compensation Act. The Board also awarded Ellen’s counsel attorney’s fees.
Norcon appealed the Board’s decision to the superior court. AS 22.10.020(d); Alaska R.App.P. 601(a). It also filed a motion for stay pending appeal, which the superior court granted.
The superior court affirmed the Board’s decision and awarded Ellen’s counsel attorney’s fees and costs on appeal. This appeal followed.
II. DISCUSSION
A. ASSUMING THE PRESUMPTION OF COMPENSABILITY PROPERLY ATTACHED, DID NORCON SUCCESSFULLY REBUT THE PRESUMPTION?1
Norcon argues that the Board was presented with overwhelming evidence from both Dr. Allan and Dr. Scheidt that rebutted the presumption of compensability. Norcon claims that the testimony established that there was no connection between Kenneth’s death and his work. In addition, Norcon contends that the superior court erred by [1054]*1054enhancing the alternative test for establishing that the presumption was rebutted.
Ellen contends that the presumption was not rebutted because the Board found Dr. Allan’s testimony ambiguous and Dr. Scheidt’s testimony inconclusive.
In Grainger v. Alaska Workers’ Compensation Board, 805 P.2d 976 (Alaska 1991), we stated that an employer can overcome the presumption of compensability by providing substantial evidence that either: “(1) provides an alternative explanation which, if accepted, would exclude work related factors as a substantial cause of the disability; or (2) directly eliminates any reasonable possibility that employment was a factor in causing the disability.” Id. at 977. “We have held that substantial evidence is ‘such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.’ ” Fireman’s Fund Am. Ins. Cos. v. Gomes, 544 P.2d 1018, 1015 (Alaska 1976) (quoting Thorton v. Alaska Workmen’s Compensation Bd., 411 P.2d 209, 210 (1966)). Whether the amount of evidence is substantial is a legal question. Id. Therefore, we must independently examine an employer’s evidence to determine whether the employer has successfully rebutted the presumption of compensability. Veco, Inc. v. Wolfer, 693 P.2d 865, 869 (Alaska 1985).
In Big K Grocery v. Gibson, 836 P.2d 941 (Alaska 1992), we held that “[i]t has always been possible to rebut the presumption of compensability by presenting a qualified expert who testifies that, in his or her opinion, the claimant’s work was probably not a substantial cause of the disability.” Id. at 942. “[S]uch testimony is affirmative evidence that an injury is not work connected.” Id. “If medical experts have ruled out work-related causes for an employee’s injury, then Wolfer and Grainger do not require that these experts also offer alternative explanations.” Childs v. Copper Valley Elec. Ass’n, 860 P.2d 1184, 1189 (Alaska 1993).2
The Board found that Dr. Scheidt’s testimony was ambiguous and that Dr. Allan’s testimony was inconclusive with respect to the work-relatedness of Kenneth’s sudden cardiac death. The Board then concluded that Norcon “failed to produce medical testimony which fulfills the requirements set forth in Grainger as to substantial evidence rebutting the presumption.” The superior court affirmed the Board’s decision. The court cited Grainger
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ORDER
On consideration of Appellees’ motion for reconsideration, filed on July 1, 1994, treated by this court as a petition for rehearing,
IT IS ORDERED:
1. Opimon No. 4097 published on July 1, 1994, is WITHDRAWN.
2. The petition for rehearing is GRANTED.
3. Opinion No. 4119 is issued on tMs date in its place.
Entered by direction of the Court at Anchorage, Alaska, on September 9, 1994.
Before MOORE, C.J., RABINOWITZ, MATTHEWS and COMPTON, JJ., and BRYNER, J. Pro Tern.*
OPINION
COMPTON, Justice.
Norcon, Inc. and its workers’ compensation carrier, Eagle Pacific Insurance Co. (Norcon), appeal fi’om a superior court decision affirming an Alaska Workers’ Compensation Board (Board) determination that Kenneth Siebert’s sudden cardiac death was work related. We reverse.
I. FACTUAL AND PROCEDURAL BACKGROUND
Kenneth Siebert was hired by Norcon in June 1989 as a crane operator in connection with the Exxon Valdez oil spill cleanup. He would pick up dumpsters with a crane and empty their contents into a containment pit. The job was temporary and scheduled to end in the fall. Originally Kenneth was hired for eight weeks on and two weeks off. However, he worked seven days a week, twelve hours a day, without any vacations.
During his employment with Norcon, Kenneth resided in a “man camp” wMch was located approximately four and one half miles from Valdez. There was conflicting testimony eoncermng the amount of rest and relaxation time available to Kenneth. According to Ellen Siebert, Kenneth’s wife, Kenneth believed that he would not be hired back if he took any time off for rest and relaxation. Mr. Gene Fontenot, Norcon’s superintendent of support services, testified that rest and relaxation was offered to everyone, and that if someone did not take some after eight weeks, he or she was encouraged to do so. Ellen testified that Kenneth told her on occasion that he was very tired, but that he wanted to stay on until the job wound down. Kenneth’s roommate, Robert Netherton, testified that although Kenneth complained occasionally of being tired, he did not do so any more than anyone else. He further testified that Kenneth never indicated to him that he was exhausted, nor did Kenneth appear as if he was exhausted.
On the mormng of September 29, 1989, Kenneth got up, showered, shaved, and exchanged pleasantries with Netherton, who [1053]*1053remained in bed. A short time later Nether-ton heard a thud. He rolled over in bed and saw that Kenneth was on the floor. Kenneth apparently suffered ventricular fibrillation, which resulted in sudden cardiac death. Emergency medical technicians succeeded in restoring his heart beat. However, Kenneth did not regain consciousness. He remained in a coma until he died in December 1989.
Kenneth was fifty-seven years old. He was a light drinker and had smoked cigarettes. Ellen testified that Kenneth had not seen a doctor in twenty years or more. No autopsy was performed.
In January 1990, Norcon filed a report of occupational injury with the Board. Nor-con’s representative filed a notice of contr-oversion. Later Ellen filed an application for adjustment of claim. Norcon filed an answer denying entitlement to benefits. Eventually the Board issued a decision and order finding that Kenneth’s death was compensable under the Alaska Workers’ Compensation Act. The Board also awarded Ellen’s counsel attorney’s fees.
Norcon appealed the Board’s decision to the superior court. AS 22.10.020(d); Alaska R.App.P. 601(a). It also filed a motion for stay pending appeal, which the superior court granted.
The superior court affirmed the Board’s decision and awarded Ellen’s counsel attorney’s fees and costs on appeal. This appeal followed.
II. DISCUSSION
A. ASSUMING THE PRESUMPTION OF COMPENSABILITY PROPERLY ATTACHED, DID NORCON SUCCESSFULLY REBUT THE PRESUMPTION?1
Norcon argues that the Board was presented with overwhelming evidence from both Dr. Allan and Dr. Scheidt that rebutted the presumption of compensability. Norcon claims that the testimony established that there was no connection between Kenneth’s death and his work. In addition, Norcon contends that the superior court erred by [1054]*1054enhancing the alternative test for establishing that the presumption was rebutted.
Ellen contends that the presumption was not rebutted because the Board found Dr. Allan’s testimony ambiguous and Dr. Scheidt’s testimony inconclusive.
In Grainger v. Alaska Workers’ Compensation Board, 805 P.2d 976 (Alaska 1991), we stated that an employer can overcome the presumption of compensability by providing substantial evidence that either: “(1) provides an alternative explanation which, if accepted, would exclude work related factors as a substantial cause of the disability; or (2) directly eliminates any reasonable possibility that employment was a factor in causing the disability.” Id. at 977. “We have held that substantial evidence is ‘such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.’ ” Fireman’s Fund Am. Ins. Cos. v. Gomes, 544 P.2d 1018, 1015 (Alaska 1976) (quoting Thorton v. Alaska Workmen’s Compensation Bd., 411 P.2d 209, 210 (1966)). Whether the amount of evidence is substantial is a legal question. Id. Therefore, we must independently examine an employer’s evidence to determine whether the employer has successfully rebutted the presumption of compensability. Veco, Inc. v. Wolfer, 693 P.2d 865, 869 (Alaska 1985).
In Big K Grocery v. Gibson, 836 P.2d 941 (Alaska 1992), we held that “[i]t has always been possible to rebut the presumption of compensability by presenting a qualified expert who testifies that, in his or her opinion, the claimant’s work was probably not a substantial cause of the disability.” Id. at 942. “[S]uch testimony is affirmative evidence that an injury is not work connected.” Id. “If medical experts have ruled out work-related causes for an employee’s injury, then Wolfer and Grainger do not require that these experts also offer alternative explanations.” Childs v. Copper Valley Elec. Ass’n, 860 P.2d 1184, 1189 (Alaska 1993).2
The Board found that Dr. Scheidt’s testimony was ambiguous and that Dr. Allan’s testimony was inconclusive with respect to the work-relatedness of Kenneth’s sudden cardiac death. The Board then concluded that Norcon “failed to produce medical testimony which fulfills the requirements set forth in Grainger as to substantial evidence rebutting the presumption.” The superior court affirmed the Board’s decision. The court cited Grainger as authority for the proposition that because the Board did not accept the alternative explanation for the cause of the employer’s death, the presumption of compensability had not been overcome.
We agree that deference should be given to the Board’s determination of a witnesses credibility. AS 23.30.122.3 However, we find it necessary to clarify that any weighing of testimony does not take place at the rebuttal stage. Rather, the weight to be accorded the doctors’ testimony must take place after a determination of whether the presumption had been overcome. See Wol-fer, 693 P.2d at 869 (“the presumption [of compensability] shifts only the burden of production and not the burden of persuasion”).
Dr. Allan and Dr. Scheidt provided evidence, in their depositions and at the hearing, that a reasonable person might accept as adequate to support the conclusion that Kenneth’s death was not work related. Dr. Scheidt testified that working long hours is not recognized to be a risk factor for sudden cardiac death. Additionally, he stated that “I do not think there’s any reasonable possibility that the two are related.” Dr. Allan testified that he did not think that Kenneth’s work was a substantial factor, either directly or indirectly, in bringing about [1055]*1055his cardiac death. Therefore, we conclude that Norcon successfully rebutted the presumption of compensability.4
B. DID ELLEN PROVE THE ELEMENTS OF HER CASE BY A PREPONDERANCE OF THE EVIDENCE?
The Board states:
Even if we considered in isolation Dr. Allen’s [sic] testimony and Dr. Scheldt’s hearing testimony only, which we would find adequate to overcome the presumption, we would still conclude Employee’s death is compensable. Once the presumption is overcome, we would weigh the evidence. We would review all the testimony given by Dr. Allen [sic] and Dr. Scheidt. We would find it inconclusive, contradictory, and doubtful. We would resolve this doubt in Employee’s favor and conclude the death is compensable.
Norcon contends that the Board’s alternative holding is incorrect. It claims that rather than requiring Ellen to produce any medical evidence that Kenneth’s sudden cardiac death was work related, the Board appeared to rely on what it perceived to be Norcon’s failure to prove that it was not.
Ellen argues that the Board chose not to rely on the testimony of either of the doctors. She concludes that the only believable evidence supported compensability of the claim.
After a determination that the presumption of compensability has been successfully rebutted, the presumption “drops out” and the employee must prove his or her case by a preponderance of the evidence. Wolfer, 693 P.2d at 870. “Upon reviewing a determination that the employee has or has not met that burden, the court must apply the ‘substantial evidence’ test....” Id. “[W]hile the judiciary may not reweigh the evidence before the Board, neither may it abdicate its reviewing function and affirm a Board decision that has only extremely slight supporting evidence.” Hoth v. Valley Constr., 671 P.2d 871, 874 (Alaska 1983) (quoting Black v. Universal Servs., Inc., 627 P.2d 1073, 1076 (Alaska 1981)).
We conclude that the Board’s holding that Ellen would have prevailed even had the presumption of compensability been rebutted is in error. There is no substantial evidence to support a holding that Kenneth’s death resulted from his employment with Norcon. In fact, Ellen presented no medical evidence showing a connection between the two. “Two factors determine whether expert medical evidence is necessary in a given ease: the probative value of the available lay evidence and the complexity of the medical facts involved.” Wolfer, 693 P.2d at 871.
The only lay evidence before the Board which supported the finding that Kenneth was “exhausted” was Ellen’s testimony that during phone conversations, Kenneth would tell her that he was tired, and that the last time she spoke with him he told her that he was extremely tired. Netherton, Kenneth’s roommate, testified that Kenneth did not complain of being tired more than anyone else and that he did not appear to be exhausted. Ellen’s testimony does not appear to have any probative value connecting fatigue to sudden cardiac death. The complexity of the cause and effect relationship in sudden cardiac death necessitates presentation of medical evidence.
Ellen also relies on the deposition testimony of both Dr. Allan and Dr. Scheidt, Nor-con’s witnesses, to establish the elements of her claim. Doctor Allan is a clinical psychologist who specializes in cardiac patients. For the past ten years his practice has centered on psychological factors in cardiac death. When discussing his view on an individual’s responsibility to take time off when they are tired, he was asked, “Are you expressing an opinion here that Mr. Siebert [1056]*1056was tired to the point that his tiredness was a significant factor in bringing about his death?” Dr. Allan replied, “That’s a very-tough question to answer, you know.” He then told of a very driven and over-worked executive who had a heart attack after a day of sailing. Dr. Allan explained that “there really is not the database to answer that kind - of question, other than by this case note.” However, a few questions latér, Dr. Allan was asked, “In Mr. Siebert’s case, was his employment either directly or indirectly, by causing tiredness, a substantial factor in bringing about his death, in your opinion?” Dr. Allan responded, “I would say, no.”
Dr. Scheidt, a cardiologist, did comment that he found it. unusual that Kenneth worked as much as he did. He stated that while it was possible that long hours could result in heightened sympathetic activity, it is not a generally recognized risk factor in sudden cardiac death. Additionally, he also stated that “the chrome stress that there’s just sort of a generalized free floating increase in sympathetic activity and that that would ... be operative the next day or after a good night’s sleep, that’s never really been documented.”
When asked if Kenneth would have suffered his cardiac arrest when he did, had he not been working as he was on the Valdez job, Dr. Scheidt replied,
Well that’s a very difficult question to an- ■ swer. I mean, in the first place, I hardly can give you a psychological profile of Mr. Siebert ... because it’s from what few comments that other people gave. And, of course, none of the medical people ever talked to Mr. Siebert.
In addition, I feel very uncomfortable because in asking the question, you seem to be presuming that medical science has made connections between psychological factors or job stress or that sort of thing and cardiac arrest. This is an area of active ongoing research.
... Nothing in this area is proven.
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There simply is not enough evidence for us to link psychological factors or stress to coronary disease or sudden death. And therefore, I can’t link it in Mr. Siebert either.
When asked whether Kenneth’s work was a substantial factor in bringing about his cardiac arrest, Dr. Scheidt responded,
It is impossible to state that. The cause of sudden cardiac death ... is unknown. And it is unknown in Mr. Siebert’s ease. It is unknown in general. It is associated with coronary atherosclerosis that has a number of associations which everybody knows about, the risk factor.
But the [cause of] sudden death ... that occurs ... in the course of coronary disease, ... is unknown. And in the vast majority of cases where we look for unusual out of the ordinary events, we don’t find them.
No other expert witnesses testified concerning a connection, or lack thereof, between fatigue and sudden cardiac death.
The Board erred in its determination that Ellen would have prevailed even if Norcon had rebutted the presumption of compensa-bility. This conclusion is not supported by substantial evidence. Although we will not reweigh the evidence on appeal, to support an award of compensation in a highly technical medical case such as this, more needs to be presented than an unexplained case note and a statement by a cardiologist that working so many hours is unusual. The quantum of evidence presented does not meet the substantial evidence test to support the Board’s determination of a connection between Kenneth’s death and his employment. See, e.g., Grainger, 805 P.2d at 979 (‘We will reverse a Board decision when we ‘cannot conscientiously find that the evidence supporting that decision is substantial.’ ”) (quoting Delaney v. Alaska Airlines, 693 P.2d 859, 864 n. 2 (Alaska 1985)). Therefore, the claim for compensation is denied.
0. ATTORNEY’S FEES
Norcon correctly contends that because the decisions of both the Board and the superior court must be reversed, the awards of attorney’s fees need also be reversed. AS 23.30.145(a) (the board may direct fees for legal services “only on the amount of com[1057]*1057pensation controverted and awarded”) (emphasis added); Alaska R.App.P. 508(g)(2) (“full reasonable attorney’s fees will be awarded to a successful claimant ”) (emphasis added); W.R. Grasle Co. v. Mumby, 838 P.2d 10, 11 (Alaska 1992) (superior court’s award of attorney’s fees reversed because the claimant was no longer a “successful claimant”).
III. CONCLUSION
Because the Board’s determination is not supported by substantial evidence, the decision of the superior court is REVERSED. The superior court is directed to remand the case to the Board, with instructions to conduct further proceedings it deems appropriate, not inconsistent with this opinion. Because Ellen is no longer a successful claimant, the awards of attorney’s fees are also REVERSED.
RABINOWITZ, Justice, dissenting.