Recent research published in Medicine & Science in Sports & Exercise explores the potential benefits of resistance training for improving nerve health and counteracting age-related decline in nerve function. The study, led by postdoctoral researcher JoCarol Shields and Professor Jason DeFreitas, indicates that engaging in simple resistance exercises may help mitigate the deterioration of nerve function often seen in older adults. This degradation, known as denervation, poses significant risks for elderly individuals, leaving them more vulnerable to injuries from falls and other accidents.

The Aging Process and Nerve Health

As individuals age, the nerves responsible for muscle control naturally degrade and slow down, leading to a phenomenon called denervation. This process particularly affects those who lead a sedentary lifestyle. The primary goal of the aforementioned study is to investigate if exercise, specifically resistance training, can help preserve nerve functionality in seniors.

"For people in their 70s and 80s, it's about preserving what you have." – JoCarol Shields

According to Shields, while aging is inevitable, the research team is exploring whether resistance training can slow down associated declines. The following aspects of the study emphasize its significance:

  • The deterioration of nerve health with age has typically received little attention compared to muscle and bone health.
  • Understanding whether resistance training can serve as an effective intervention is crucial in preserving overall health and independence for aging individuals.

Study Design and Methodology

The study tested the effects of resistance training on nerve conduction velocity (NCV) among 48 participants aged between 18 and 84. Through a series of nerve conduction tests conducted before and after a four-week handgrip training program, researchers sought to determine improvements in NCV.

Nerve Conduction Testing

The testing methodology involved stimulating the nerves in the forearm to measure the speed at which impulses traveled to activate the muscles. A depiction of the procedure is shown in Figure A and illustrated in Figure B below:

Figure Description
Figure A Visual depiction of nerve stimulation methodology including stimulation sites and electrode placement.
Figure B Calculation of NCV based on proximal latency, distal latency, and the distance between stimulation sites.

Results and Implications

The results showed that all senior participants who underwent the handgrip training exhibited significant improvements in nerve conduction velocity. The researchers suggest that resistance training may have reactivated fast motor neurons that typically deteriorate with age, a process referred to as reinnervation.

Participant Age Group Pre-Training NCV (m·s−1) Post-Training NCV (m·s−1)
18-30 years 60 ± 5 62 ± 4
31-50 years 59 ± 7 62 ± 6
51-70 years 55 ± 8 60 ± 7
71-84 years 52 ± 9 58 ± 8

Future Research Directions

As this study highlights the potential benefits of resistance training, the research team plans to conduct further studies to explore:

  • Long-term effects of resistance training on nerve health across different demographics.
  • The impact of various types of exercise interventions on mitigating nerve degradation.
  • Potential correlations between reactivated motor neurons and overall functional independence in older adults.

Conclusion

Ultimately, the work presented by Shields and her colleagues underscores the necessity of further exploration into the adaptability of nerve function through resistance training. The findings suggest promise not only for older adults seeking to preserve strength and mobility but also for potential implications related to other non-age-related nerve disorders.

References

Shields, J. E., DeFreitas, J. (2025). An Exercise Intervention May Counteract the Degradation of Nerve Conduction from Age-Related Disuse. Medicine & Science in Sports & Exercise. DOI: 10.1249/mss.0000000000003767.

For more information, visit the publication here: Resistance training may improve nerve health, slow aging process.