This study aimed to i) determine the load-velocity relationship in the seated chest press in older adults, ii) compare the magnitude of the relationship between peak and mean velocity with the ...relative load, and iii) analyze the differences between sexes in movement velocity for each relative load in the chest press.
Thirty-two older adults (17 women and 15 men; 79.6±7.7 years) performed a chest press progressive loading test up to the one-repetition maximum (1RM). The fastest peak and mean velocity reached with each weight were analyzed. Quadratic equations were developed for both sexes and the effectiveness of the regression model was analyzed through a residual analysis. The equations were cross-validated, considering the holdout method. The independent samples t-test analyzed i) the differences in the magnitude of the relationship between peak and mean velocity with the relative load and ii) the differences between sexes in the peak and mean velocity for each relative load.
It was possible to observe very strong quadratic load-velocity relationships in the seated chest press in women (peak velocity: r2 = 0.97, standard error of the estimate (SEE) = 4.5% 1RM; mean velocity: r2 = 0.96, SEE = 5.3% 1RM) and men (peak velocity: r2 = 0.98, SEE = 3.8% 1RM; mean velocity: r2 = 0.98, SEE = 3.8% 1RM) without differences (p>0.05) in the magnitude of the relationship between peak and mean velocity with the relative load. Furthermore, there was no overfitting in the regression models due to the high and positive correlation coefficients (r = 0.98-0.99). Finally, men presented higher (p<0.001) lifting velocities than women in almost all relative loads, except for 95-100% 1RM (p>0.05).
Measuring repetition velocity during the seated chest press is an objective approach to estimating the relative load in older adults. Furthermore, given the velocity differences between older women and men at submaximal loads, it is recommended to use sex-specific equations to estimate and prescribe the relative loads in older adults.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Effective manipulation of the acute variables of resistance training is critical to optimizing muscle and functional adaptations in middle-aged and older adults. However, the ideal volume ...prescription (e.g., number of sets performed per exercise) in middle-aged and older adults remains inconclusive in the literature.
The effects of single versus multiple sets per exercise on muscle strength and size, muscle quality, and functional capacity in middle-aged and older adults were compared. Moreover, the effects of single versus multiple sets per exercise on muscular and functional gains were also examined, considering the influence of training duration.
Randomized controlled trials and non-randomized controlled trials comparing single versus multiple sets per exercise on muscle strength, muscle size, muscle quality, or functional capacity in middle-aged and older adults (aged ≥ 50 years) in the PubMed/MEDLINE, Web of Science, and Scopus databases (01/09/2021, updated on 15/05/2022) were identified. A random-effects meta-analysis was used.
Fifteen studies were included (430 participants; 93% women; age 57.9-70.1 years). Multiple sets per exercise produced a greater effect than single sets on lower-limb strength (standardized mean difference SMD = 0.29; 95% confidence interval CI 0.07-0.51; mean difference MD = 1.91 kg; 95% CI 0.50-3.33) and muscle quality (SMD = 0.40; 95% CI 0.05-0.75) gains. There were no differences between single versus multiple sets per exercise for upper-limb strength (SMD = 0.13; 95% CI - 0.14 to 0.40; MD = 0.11 kg; 95% CI - 0.52 to 0.75), muscle size (SMD = 0.15; 95% CI - 0.07 to 0.37), and functional capacity (SMD = 0.01; 95% CI - 0.47 to 0.50) gains. In addition, there were no differences between single versus multiple sets on muscle strength and size gains for training durations ≤ 12 weeks or > 12 weeks.
Multiple sets per exercise produced greater lower-limb strength and muscle quality gains than single sets in middle-aged and older adults, although the magnitude of the difference was small. In contrast, single sets per exercise were sufficient to improve upper-limb strength, muscle size, and functional capacity in these populations. Despite these findings, researchers should conduct future high-quality, pre-registered, and blinded randomized controlled trials to strengthen the scientific evidence on this topic.
We compared the effects of velocity-monitored resistance training with an intra-set velocity loss (i.e., the decrement in repetition velocity over the set) of 10 % vs. 20 % on strength-related ...outcomes in older adults. We randomly assigned eighteen older adults to a velocity loss group of 10 % (n = 10; 78 ± 12 years) or 20 % (n = 8; 73 ± 10 years) to perform a 10-week training program. The primary outcomes were the one-repetition maximum (1RM) and the average mean velocity against absolute loads associated with loads <60 % 1RM (MV
) and ≥ 60 % 1RM (MV
) in the leg and chest press exercises, assessed at pre-, mid- (week 5), and post-test. Secondary outcomes included handgrip strength, 1-kg medicine ball throw distance, 10-m walking time, and five-repetition sit-to-stand time. No differences between groups were found in any outcome at any time (p > 0.05). Both groups improved the 1RM leg press from pre- to mid- and post-test and the MV
and MV
from pre- to mid-test (p < 0.05). No group improved the 1RM chest press (p > 0.05), but both increased the MV
from pre- to mid-test (p < 0.05). Furthermore, both groups improved the sit-to-stand time, while only the 20 % velocity loss group significantly improved handgrip strength and 10-m walking time (p < 0.05). The results showed that both velocity losses improved leg press strength and velocity, chest press velocity, and sit-to-stand time in older adults, although a 10 % velocity loss was more efficient as it required less volume (i.e., total repetitions) than 20 %. Nevertheless, the latter seems required to optimize handgrip strength and 10-m walking time in older people.
In the pandemic time, the monitoring of the progression of some diseases is affected and rehabilitation is more complicated. Remote monitoring may help solve this problem using mobile devices that ...embed low-cost sensors, which can help measure different physical parameters. Many tests can be applied remotely, one of which is the six-minute walk test (6MWT). The 6MWT is a sub-maximal exercise test that assesses aerobic capacity and endurance, allowing early detection of emerging medical conditions with changes. This paper presents a systematic review of the use of sensors to measure the different physical parameters during the performance of 6MWT, focusing on various diseases, sensors, and implemented methodologies. It was performed with the PRISMA methodology, where the search was conducted in different databases, including IEEE Xplore, ACM Digital Library, ScienceDirect, and PubMed Central. After filtering the papers related to 6MWT and sensors, we selected 31 papers that were analyzed in more detail. Our analysis discovered that the measurements of 6MWT are primarily performed with inertial and magnetic sensors. Likewise, most research studies related to this test focus on multiple sclerosis and pulmonary diseases.
Smartphone sensors have often been proposed as pervasive measurement systems to assess mobility in older adults due to their ease of use and low-cost. This study analyzes a smartphone-based ...application's validity and reliability to quantify temporal variables during the single sit-to-stand test with institutionalized older adults. Forty older adults (20 women and 20 men; 78.9 ± 8.6 years) volunteered to participate in this study. All participants performed the single sit-to-stand test. Each sit-to-stand repetition was performed after an acoustic signal was emitted by the smartphone app. All data were acquired simultaneously with a smartphone and a digital video camera. The measured temporal variables were stand-up time and total time. The relative reliability and systematic bias inter-device were assessed using the intraclass correlation coefficient (ICC) and Bland-Altman plots. In contrast, absolute reliability was assessed using the standard error of measurement and coefficient of variation (CV). Inter-device concurrent validity was assessed through correlation analysis. The absolute percent error (APE) and the accuracy were also calculated. The results showed excellent reliability (ICC = 0.92-0.97; CV = 1.85-3.03) and very strong relationships inter-devices for the stand-up time (
= 0.94) and the total time (
= 0.98). The APE was lower than 6%, and the accuracy was higher than 94%. Based on our data, the findings suggest that the smartphone application is valid and reliable to collect the stand-up time and total time during the single sit-to-stand test with older adults.
Abstract
Marques, DL, Neiva, HP, Marinho, DA, and Marques, MC. Velocity-monitored resistance training in older adults: the effects of low-velocity loss threshold on strength and functional capacity.
...J Strength Cond Res
36(11): 3200–3208, 2022—This study analyzed the effects of velocity-monitored resistance training (RT) with a velocity loss of 10% on strength and functional capacity in older adults. Forty-two subjects (79.7 ± 7.1 years) were allocated into an RT group (
n
= 21) or a control group (CG;
n
= 21). Over 10 weeks, the RT group performed 2 sessions per week, whereas the CG maintained their daily routine. During RT sessions, we monitored each repetition's mean velocity in the leg press and chest press exercises at 40–65% of 1 repetition maximum (1RM). The set ended when a velocity loss of 10% was reached. At pretest and post-test, both groups were assessed in the 1RM leg press and chest press, handgrip strength, medicine ball throw (MBT), walking speed (T
10
), and 5-repetition sit-to-stand (STS). After 10 weeks, the RT group significantly improved the 1RM leg press (
p
< 0.001; Hedge's
g
effect size
g
= 0.55), 1RM chest press (
p
< 0.001;
g
= 0.72), MBT 1kg (
p
< 0.01;
g
= 0.26), T
10
(
p
< 0.05;
g
= −0.29), and STS (
p
< 0.05;
g
= −0.29), whereas the CG significantly increased the T
10
(
p
< 0.05;
g
= 0.15). Comparisons between groups at post-test demonstrated significant differences in the 1RM leg press (
p
< 0.001; mean difference MD = 14.4 kg), 1RM chest press (
p
< 0.001; MD = 7.52), MBT 1kg (
p
< 0.05; MD = 0.40 m), T
10
(
p
< 0.001; MD = −0.60 seconds), and STS (
p
< 0.001; MD = −1.85 seconds). Our data demonstrate that velocity-monitored RT with velocity loss of 10% results in a few repetitions per set (leg press: 5.1 ± 1.2; chest press: 3.6 ± 0.9) and significantly improves strength and functional capacity in older adults.
Mindfulness-based interventions (MBIs) are reported by experimental studies as practical approaches to reduce burnout in primary healthcare professionals (PHCP). However, to date, no research has ...synthesized the evidence to determine the overall effects of MBIs for reducing burnout in PHCP. We conducted a systematic review and meta-analysis to analyze the effects of MBIs to reduce burnout in PHCP. We searched articles in the PubMed/MEDLINE, Web of Science, Cochrane, and Scopus databases from inception to September 2021 using MeSH terms: “mindfulness”, “burnout”, and “primary healthcare”. Two reviewers extracted the data and assessed the risk of bias. We used a random-effects meta-analysis to calculate the standardized mean differences (SMD) and mean differences (MD) with 95% confidence intervals (CI) of emotional exhaustion (EE), depersonalization (DP), and personal accomplishment (PA) domains of burnout. Of 61 records, ten were included (n = 417). Overall, the studies were rated as having a high risk of bias and limited quality evidence. MBIs significantly reduced EE (SMD = −0.54, 95%CI: −0.72 to −0.36; MD = −5.89, 95%CI: −7.72 to −4.05), DP (SMD = −0.34, 95%CI: −0.52 to −0.17; MD = −1.96, 95%CI: −2.96 to −0.95), and significantly increased PA (SMD = 0.34, 95%CI: 0.17 to 0.52; MD = 2.05, 95%CI: 1.04 to 3.06). Although further high-quality research is needed, our findings support the implementation of MBIs for reducing burnout in PHCP.
This study analyzed the predictive ability of movement velocity to estimate the relative load (i.e., % of one-repetition maximum 1RM) during the horizontal leg-press exercise in older women and men. ...Twenty-four women and fourteen men living in community-dwelling centers volunteered to participate in this study. All participants performed a progressive loading test up to 1RM in the horizontal leg-press. The fastest peak velocity (PV) and mean velocity (MV) attained with each weight were collected for analysis. Linear regression equations were modeled for women and men. We observed very strong linear relationships between both velocity variables and the relative load in the horizontal leg-press in women (PV: r2 = 0.93 and standard error of the estimate (SEE) = 5.96% 1RM; MV: r2 = 0.94 and SEE = 5.59% 1RM) and men (PV: r2 = 0.93 and SEE = 5.96% 1RM; MV: r2 = 0.94 and SEE = 5.97% 1RM). The actual 1RM and the estimated 1RM using both the PV and MV presented trivial differences and very strong relationships (r = 0.98–0.99) in both sexes. Men presented significantly higher (p < 0.001–0.05) estimated PV and MV against all relative loads compared to women (average PV = 0.81 vs. 0.69 m·s−1 and average MV = 0.44 vs. 0.38 m·s−1). Our data suggest that movement velocity accurately estimates the relative load during the horizontal leg-press in older women and men. Coaches and researchers can use the proposed sex-specific regression equations in the horizontal leg-press to implement velocity-monitored resistance training with older adults.
•Estimating 1RM from the peak and mean velocity in the leg-press in older adults•Sex-specific load-velocity regression equations in the leg-press in older adults•Men compared to women have higher lifting velocities at similar relative loads.•Equations to assess, prescribe and monitor the training load in the leg-press
Identifying the relative loads (%1RM) that maximize power output (P
max-load
) in resistance exercises can help design interventions to optimize muscle power in older adults. Moreover, examining the ...maximal mean power (MP
max
) and peak power (PP
max
) values (Watts) would allow an understanding of their differences and associations with functionality markers in older adults. Therefore, this research aimed to 1) analyze the load-mean and peak power relationships in the leg press and chest press in older adults, 2) examine the differences between mean P
max-load
(MP
max-load
) and peak P
max-load
(PP
max-load
) within resistance exercises, 3) identify the differences between resistance exercises in MP
max-load
and PP
max-load
, and 4) explore the associations between MP
max
and PP
max
in the leg press and chest press with functional capacity indicators. Thirty-two older adults (79.3 ± 7.3 years) performed the following tests: medicine ball throw (MBT), five-repetition sit-to-stand (STS), 10-m walking (10 W), and a progressive loading test in the leg press and chest press. Quadratic regressions analyzed 1) the load-mean and peak power relationships and identified the MP
max-load
, MP
max
, PP
max-load
, and PP
max
in both exercises, 2) the associations between MP
max
and PP
max
in the chest press with MBT, and 3) the associations between MP
max
and PP
max
in the leg press with STS
power
and 10W
velocity
. In the leg press, the MP
max-load
was ∼66% 1RM, and the PP
max-load
was ∼62% 1RM, both for women and men (
p
> 0.05). In the chest press, the MP
max-load
was ∼62% 1RM, and the PP
max-load
was ∼56% 1RM, both for women and men (
p
> 0.05). There were differences between MP
max-load
and PP
max-load
within exercises (
p
< 0.01) and differences between exercises in MP
max-load
and PP
max-load
(
p
< 0.01). The MP
max
and PP
max
in the chest press explained ∼48% and ∼52% of the MBT-1 kg and MBT-3 kg variance, respectively. In the leg press, the MP
max
and PP
max
explained ∼59% of STS
power
variance; however, both variables could not explain the 10W
velocity
performance (
r
2
∼ 0.02). This study shows that the P
max-load
is similar between sexes, is resistance exercise-specific, and varies within exercises depending on the mechanical power variable used in older adults. Furthermore, this research demonstrates the influence of the MBT as an upper-limb power marker in older adults.
Mixed martial arts (MMA) athletes must achieve high strength levels to face the physical demands of an MMA fight. This study compared MMA athletes’ maximal isometric and dynamic strength according to ...the competitive level and weight class. Twenty-one male MMA athletes were divided into lightweight professional (LWP; n = 9), lightweight elite (LWE; n = 4), heavyweight professional (HWP; n = 4), and heavyweight elite (HWE; n = 4). The handgrip and isometric lumbar strength tests assessed the isometric strength, and the one-repetition maximum (1RM) bench press and 4RM leg press the dynamic strength. Univariate ANOVA showed differences between groups in absolute and relative 1RM bench press and absolute isometric lumbar strength. Post hoc tests showed differences in 1RM bench press between HWE and LWE (117.0 ± 17.8 kg vs. 81.0 ± 10.0 kg) and HWE and LWP athletes (117.0 ± 17.8 kg vs. 76.7 ± 13.7 kg; 1.5 ± 0.2 kg·BW−1 vs. 1.1 ± 0.2 kg·BW−1). In addition, there was a correlation between 1RM bench press and isometric lumbar strength for absolute (r = 0.67) and relative values (r = 0.50). This study showed that the 1RM bench press and isometric lumbar strength were associated and could differentiate MMA athletes according to their competitive level and weight class. Therefore, optimizing the force production in the upper body and lower back seems important in elite and professional MMA athletes.
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