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Group mean (±SD) absolute (A) and normalized (B; percentage of the peak amplitude during RI exercise) muscle deoxygenation (Δ[HHb]) response profiles to RI exercise in YA (●; n = 9) and OA (○; n = 6). Continuous curves represent mean values for all subjects; single points represent group mean (±SD) values at the point of fatigue during RI exercise. The dashed line indicates the onset of RI exercise.
