Impact of Whey and Collagen Protein Supplements on Muscle Loss in the Elderly

Understanding Age-Related Muscle Loss

As individuals age, they naturally experience a decline in muscle mass. While reduced physical activity contributes to this loss, even active seniors are not immune to muscle deterioration. Such muscle loss can negatively affect mobility and balance, increasing the risk of falls and fractures. Additionally, muscle loss may be exacerbated by illness or hospitalization, during which individuals often face inactivity and insufficient nutrition. Strength training and resistance exercises are effective methods to mitigate muscle loss, and protein supplementation may further support muscle rebuilding.

Research Overview

The question of which protein supplements are most beneficial for older adults remains unclear. A study conducted by researchers at McMaster University in Ontario, Canada, explored the effects of whey and collagen protein supplements on preventing muscle loss and aiding muscle rebuilding in healthy elderly individuals. Their findings were published in the American Journal of Clinical Nutrition.

Study Design

The study involved 32 healthy male and female participants aged 65 to 80 years, who were engaged in a five-week experimental protocol. During this period, participants received calorie-controlled meals and were randomly assigned to either whey or collagen protein supplements.

Initially, researchers monitored participants for one week before reducing their caloric intake by 500 calories. Subsequently, the participants were instructed to limit their physical activity to 750 steps per day for two weeks, simulating conditions akin to illness or hospitalization. In the final week, participants returned to their normal dietary intake and activity levels. Throughout the study, blood tests, muscle biopsies, and scans were conducted to assess muscle loss and rebuilding.

Findings

Results indicated that participants in both groups experienced muscle mass loss during the calorie restriction and decreased activity phases. However, during the recovery period, only those in the whey protein group demonstrated an increase in muscle mass, while the collagen protein group did not show similar gains.

The researchers concluded that protein supplementation did not prevent muscle loss during periods of caloric restriction and inactivity. While whey protein facilitated muscle rebuilding during recovery, collagen protein did not exhibit the same benefits.

Conclusion

Whey protein is recognized as a high-quality protein, containing all essential amino acids, including leucine, which is crucial for muscle development. In contrast, collagen is considered a lower-quality protein with reduced leucine content. The researchers emphasized that “not all proteins are created equal,” suggesting that whey protein is a more suitable option than collagen for supporting muscle rebuilding in vulnerable seniors.

References

Oikawa SY, McGlory C, Souza LK, et al. A randomized controlled trial of the impact of protein supplementation on leg lean mass and integrated muscle protein synthesis during inactivity and energy restriction in older persons. Am J Clin Nutrition 2018:108;1-9.

McMaster University. Researchers pinpoint ideal protein to help seniors rebuild lost muscle. EurekAlert, 9 Oct 2018. https://www.eurekalert.org/pub_releases/2018-10/mu-rpi100918.php