Rate of perceived exertion as a tool to monitor cycling exercise intensity in older adults

The purpose of this study was to determine the efficacy of rate of perceived exertion (RPE) to monitor exercise intensity in older adults. Middle-aged (46.9 +/- 7.0 years, n = 24) and older women (75.5 +/- 3.8 years, n = 29) performed a graded maximal exercise test on a cycle ergometer while RPE, oxygen uptake, heart rate, and blood lactate levels were measured. The Pearson's product moment correlation coefficient between RPE and oxygen uptake for each stage of the graded exercise test was calculated for each participant. The mean coefficient for the older group (r =.954) was similar to that of middle-aged group (r =.963). The autocorrelation coefficient was much lower (r =.411) in the older group than in the middle-aged group (r =.871). Variability in RPE through the graded exercise test was similar between the two groups. In conclusion, RPE was strongly associated with oxygen uptake in the older group. These results indicate that RPE is effective in monitoring exercise intensity in older adults.     

The Japanese Women's Liberation Movement and the United Red Army

This article examines how the Japanese women's liberation movement responded to the news coverage of the United Red Army Incidents in 1972. The United Red Army was considered to be Japan's most violent domestic revolutionary sect. The United Red Army's misguided use of “revolutionary violence” in 1972 was devastating for Japanese leftist radicalism. The Japanese women's liberation movement was a political formation that emerged in 1970 in the wake of the Anti-Vietnam War and student movements of the late 1960s. In contrast to how the United Red Army received condemnation from across the political spectrum, from the right to the far-left, I focus on how these activists supported and identified with the women of the URA as an expression of their feminist politics. Through my analysis of the alternative media produced by these Japanese feminists and their multi-faceted support for the women in the URA, I argue that their intervention constituted a feminist praxis of critical solidarity and provides an illuminating feminist response to political violence.     

Skill-biased technical change, educational choice, and labor market polarization: the U.S. versus Europe

This paper analyzes the effect of recent technical change on the labor market and explains the observed differences in wage inequality among advanced countries. In particular, we focus on the difference between the inequality in the U.S. and in continental Europe. Many studies have indicated a rise in wage inequality in the U.S. over the past three decades. On the other hand, there has been little change in wage inequality in continental Europe. By introducing human capital investment into the model by Acemoglu (Am Econ Rev 89:1259–1278, 1999), we show that ex ante homogeneous economies would have distinct ex post wage distribution. The strategic complementarity between human capital investment and firms’ hiring strategies yields the possibility that multiple equilibria exist, which explains the difference in wage distribution between the U.S. and Europe. In addition, we show that differences in tax or education systems can explain the difference in wage distribution between the U.S. and Europe.     

Effects of 10-week walking and walking with home-based resistance training on muscle quality,muscle size,and physical functional tests in healthy older individuals

Background

Older individuals have been shown to present muscle atrophy in conjunction with increased fat fraction in some muscles. The proportion of fat and connective tissue within the skeletal muscle can be estimated from axial B-mode ultrasound images using echo intensity (EI). EI was used to calculate the index of muscle quality. Walking, home-based weight-bearing resistance training, and its combinations are considered simple, easy, and practical exercise interventions for older adults. The purpose of this study was to quantify the effects of walking and walking with home-based resistance training on muscle quality of older individuals.

Methods

Thirty-one participants performed walking training only (W-group; 72?±?5?years) and 33 participants performed walking and home-based resistance training (WR-group; 73?±?6?years). This study was a non-randomized controlled trial with no control group. All participants were instructed to walk 2 or 3 sets per week for 10?weeks (one set: 30-min continuous walking). In addition, the WR-group performed home-based weight-bearing resistance training. EI was measured as a muscle quality index using axial B-mode ultrasound images of the rectus femoris and vastus lateralis of the mid-thigh. We further averaged these parameters to obtain the EI of the quadriceps femoris (QF). Participants further performed five functional tests: sit-ups, supine up, sit-to-stand, 5-m maximal walk, and 6-min walk.

Results

QF EI was significantly decreased in both groups after training (W-group 69.9?±?7.4?a.u. to 61.7?±?7.0?a.u., WR-group 64.0?±?9.5?a.u. to 51.1?±?10.0?a.u.; P?<?0.05), suggesting improved muscle quality. QF EI was further decreased in the WR-group compared with the W-group. The sit-up test in both groups and the sit-to-stand and 5-m maximal walk tests in the W-group were significantly improved after training.

Conclusion

These results suggest that training-induced stimulation is associated with a decrease in EI in some thigh regions. Furthermore, the addition of home-based resistance training to walking would be effective for a greater reduction of EI.