The objective of this study was to determine the daily dietary nicotinamide riboside (NR) dose required to maximize the delay of subjective muscle fatigue onset. Barrows (N = 100) were assigned to one of five treatments: a conventional swine finishing diet containing 0 (CON), 15 (15NR), 30 (30NR), 45 (45NR) mg·kg body weight⁻¹·d⁻¹ NR, or CON supplemented with 45 mg·kg body weight⁻¹·d⁻¹ NR by drench or cookie dough (DRE). All treatments were administered for the final 11 days of feeding. On supplementation d 10, barrows individually experienced a performance test at 1.09 m/s until they were subjectively exhausted. Wireless electromyography (EMG) sensors were affixed to the biceps femoris (BF), tensor fascia latae (TFL), and semitendinosus (ST) to measure real-time muscle activity. There were no treatment effects for barrow speed (p = 0.57), a tendency for a treatment effect (p = 0.07) for distance, and a treatment effect (p = 0.04) on time to exhaustion. Barrows of the 15NR and DRE treatments had greater (p = 0.05) distances to exhaustion than CON barrows but did not differ from other NR barrows (p > 0.11). Barrows in the 45NR treatment did not differ (p = 0.11) in distance from 30NR barrows but tended to have a greater (p = 0.07) distance compared to CON barrows. All other treatment comparisons did not differ (p > 0.27). Barrows in the DRE treatment moved for longer (p < 0.01) than CON barrows, but all other treatments did not differ from each other (p > 0.15). There was no treatment × period interaction for all muscles’ root mean square (RMS) values (p > 0.16), but there were Period effects for all muscles (p < 0.01) and a Treatment effect (p = 0.04) in the TFL. For all muscles, period 4 had greater RMS values than all other periods (p < 0.01), who did not differ from each other (p > 0.29). In the TFL, CON barrows had greater RMS values during the performance test compared to all NR treatments (p < 0.02), who did not differ from each other (p > 0.18). Overall, NR demonstrates potential in being a useful tool in fatigue prevention, but efficient administration of the compound needs further investigation.

This study evaluated far-UVC light exposure on the visual quality of deli turkey and ham during a 5-day retail display period. Deli turkey and ham were sliced and treated with 222 nm far-UVC. Turkey received treatments: no far-UVC light (Control), low-dose 337 mJ/cm² (L-UVC; Low-UVC), and high-dose 786.3 mJ/cm² (H-UVC; high-UVC), while ham received Control and H-UVC treatments. Display slices were stored refrigerated and evaluated daily for color and purchase intent, with lipid oxidation measured on days 1 and 5. Data were analyzed using repeated-measure models. On day 5, H-UVC turkey slices demonstrated reduced purchase intent scores (p < 0.05) and a 23.7% greater total color change (ΔE; p < 0.01) compared with Control and L-UVC turkey. In ham, Control slices had a 9.5% greater ΔE from day 1 to 5 than H-UVC (p = 0.03). No differences in lipid oxidation were observed between treatments. Four hours after H-UVC treatment, deli turkey slice yellowness remained elevated compared to pre-treatment levels (p < 0.01). Far-UVC doses evaluated in the present study would not negatively impact the ham visual quality over a 5-day display. However, increased yellowness observed in turkey suggests that far-UVC light may be more appropriate for post-packaging surface sanitation applications than for the direct treatment of deli turkey.