Background
Exercise holds promise as a non‐pharmacological intervention for the improvement of sleep quality. Therefore, this study investigates the effects of different training modalities on sleep ...quality parameters.
Material & methods
A total of 69 (52.7% women) middle‐aged sedentary adults were randomized to (a) control group, (b) physical activity recommendation from the World Health Organization, (c) high‐intensity interval training (HIIT) and (d) high‐intensity interval training group adding whole‐body electromyostimulation training (HIITEMS). Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI) scale and accelerometers.
Results
All intervention groups showed a lower PSQI global score (all P < .022). HIIT‐EMS group improved all accelerometer parameters, with higher total sleep time and sleep efficiency, and lower wake after sleep onset (all P < .016). No differences were found between groups in any sleep quality parameter.
Conclusion
In conclusion, exercise training induced an improvement in subjective sleep quality in sedentary middleaged adults. Moreover, HIIT‐EMS training showed an improvement in objective sleep quality parameters (total sleep time, sleep efficiency and wake after sleep onset) after 12 weeks of exercise intervention. The changes observed in the HIIT‐EMS group were not statistically different to the other exercise modalities.
Dorrell, HF, Smith, MF, and Gee, TI. Comparison of velocity-based and traditional percentage-based loading methods on maximal strength and power adaptations. J Strength Cond Res 34(1): 46-53, ...2020-This study explored the effects of velocity-based training (VBT) on maximal strength and jump height. Sixteen trained men (22.8 ± 4.5 years) completed a countermovement jump (CMJ) test and 1 repetition maximum (1RM) assessment on back squat, bench press, strict overhead press, and deadlift, before and after 6 weeks of resistance training. Participants were assigned to VBT or percentage-based training (PBT) groups. The VBT group's load was dictated through real-time velocity monitoring, as opposed to pretesting 1RM data (PBT). No significant differences were present between groups for pretesting data (p > 0.05). Training resulted in significant increases (p < 0.05) in maximal strength for back squat (VBT 9%, PBT 8%), bench press (VBT 8%, PBT 4%), strict overhead press (VBT 6%, PBT 6%), and deadlift (VBT 6%). Significant increases in CMJ were witnessed for the VBT group only (5%). A significant interaction effect was witnessed between training groups for bench press (p = 0.004) and CMJ (p = 0.018). Furthermore, for back squat (9%), bench press (6%), and strict overhead press (6%), a significant difference was present between the total volume lifted. The VBT intervention induced favorable adaptations in maximal strength and jump height in trained men when compared with a traditional PBT approach. Interestingly, the VBT group achieved these positive outcomes despite a significant reduction in total training volume compared with the PBT group. This has potentially positive implications for the management of fatigue during resistance training.
ABSTRACT
Introduction
This study compares the acute and chronic response of high‐load resistance training (HL) to low‐load resistance training with low blood flow restriction (LL‐BFR) pressure.
...Methods
Participants completed elbow flexion with either HL or LL‐BFR or nonexercise. In the chronic study, participants in the HL and LL‐BFR groups were trained for 8 weeks to determine differences in muscle size and strength. The acute study examined the changes in pretesting/posttesting (Pre/Post) torque, muscle swelling, and blood lactate.
Results
In the chronic study, similar changes in muscle size and strength were observed for both HL and LL‐BFR. In the acute study, Pre/Post changes in the torque, muscle swelling, and blood lactate were similar between HL and LL‐BFR.
Discussion
Our findings indicate that pressure as low as 50% arterial occlusion can produce similar changes in muscle mass and strength compared with traditional HL. Muscle Nerve 56: E126–E133, 2017
Little evidence exists on which variables of body composition or muscular strength mediates more glucose control improvements taking into account inter-individual metabolic variability to different ...modes of exercise training.
We examined 'mediators' to the effects of 6-weeks of resistance training (RT) or high-intensity interval training (HIT) on glucose control parameters in physically inactive schoolchildren with insulin resistance (IR). Second, we also determined both training-induce changes and the prevalence of responders (R) and non-responders (NR) to decrease the IR level.
Fifty-six physically inactive children diagnosed with IR followed a RT or supervised HIT program for 6 weeks. Participants were classified based on ΔHOMA-IR into glycemic control R (decrease in homeostasis model assessment-IR (HOMA-IR) <3.0 after intervention) and NRs (no changes or values HOMA-IR⩾3.0 after intervention). The primary outcome was HOMA-IR associated with their mediators; second, the training-induced changes to glucose control parameters; and third the report of R and NR to improve body composition, cardiovascular, metabolic and performance variables.
Mediation analysis revealed that improvements (decreases) in abdominal fat by the waist circumference can explain more the effects (decreases) of HOMA-IR in physically inactive schoolchildren under RT or HIT regimes. The same analysis showed that increased one-maximum repetition leg-extension was correlated with the change in HOMA-IR (β=-0.058; P=0.049). Furthermore, a change in the waist circumference fully mediated the dose-response relationship between changes in the leg-extension strength and HOMA-IR (β'=-0.004; P=0.178). RT or HIT were associated with significant improvements in body composition, muscular strength, blood pressure and cardiometabolic parameters irrespective of improvement in glycemic control response. Both glucose control RT-R and HIT-R (respectively), had significant improvements in mean HOMA-IR, mean muscular strength leg-extension and mean measures of adiposity.
The improvements in the lower body strength and the decreases in waist circumference can explain more the effects of the improvements in glucose control of IR schoolchildren in R group after 6 weeks of RT or HIT, showing both regimes similar effects on body composition or muscular strength independent of interindividual metabolic response variability.
Training on trial Kirkpatrick, James D; Kirkpatrick, Wendy Kayser
2010, 2010., 2010-02-03T00:00:00, 2010-12-31, c2010
eBook, Book
While upbeat lingo abounds about 'complementing strategic objectives' and 'driving productivity', the fact is that most training does not make a significant enough impact on business results, and ...when it does, training professionals fail to make a convincing case about the value added to the bottom line. The vaunted 'business partnership model' has yet to be realized - and in tough economic times, when the training budget is often the first to be cut, training is on trial for its very existence. Using a courtroom trial as a metaphor, "Training on Trial" seeks to get to the truth about why training fails and puts the business partnership model to work for real. Readers on both sides of the 'courtroom' will learn how to stop viewing training as a cost center, and bridge the gulf between what learning functions deliver and what business units need to execute their strategies. A thought-provoking read for trainers and business unit leaders alike, "Training on Trial" provides a new application of the Kirkpatrick Four - 'Level Evaluation Model and a multitude of tips and techniques that allow lessons learned to be put into action now.
There are marked changes in skill requirements in today's modern societies, and major questions about the processes of skill formation remain unresolved. What do we mean when we talk about skills, ...qualifications and competencies? Are market economies and firms systematically under-investing in skills? This book addresses these questions by first looking at what we mean when we talk about 'skills'. Secondly, it looks at the institutions where skills are acquired, before finally considering the provision of and access to training. It provides an up-to-date review of theories and research on skill formation in psychology, economics, political science and sociology, and addresses issues of skill learning and measurement, institutional and policy differences between countries, the issue of skill formation across a lifetime and disparities between socio-economic groups.
ABSTRACT
Introduction
The purpose of this study was to determine the impact of an in‐home expiratory muscle strength training (EMST) program on pulmonary, swallow, and cough function in individuals ...with amyotrophic lateral sclerosis (ALS).
Methods
EMST was tested in a prospective, single‐center, double‐blind, randomized, controlled trial of 48 ALS individuals who completed 8 weeks of either active EMST (n = 24) or sham EMST (n = 24). The primary outcome to assess treatment efficacy was change in maximum expiratory pressure (MEP). Secondary outcomes included: cough spirometry; swallowing; forced vital capacity; and scoring on the ALS Functional Rating Scale—Revised.
Results
Treatment was well tolerated with 96% of patients completing the protocol. Significant differences in group change scores were noted for MEP and Dynamic Imaging Grade of Swallowing Toxicity scores (P < 0.02). No differences were noted for other secondary measures.
Discussion
This respiratory training program was well‐tolerated and led to improvements in respiratory and bulbar function in ALS. Muscle Nerve 59:40–46, 2019
See editorial on pages 6–7 in this issue.
Purpose
To describe the acute and delayed time course of recovery following resistance training (RT) protocols differing in the number of repetitions (R) performed in each set (S) out of the maximum ...possible number (P).
Methods
Ten resistance-trained men undertook three RT protocols S × R(P): (1) 3 × 5(10), (2) 6 × 5(10), and (3) 3 × 10(10) in the bench press (BP) and full squat (SQ) exercises. Selected mechanical and biochemical variables were assessed at seven time points (from − 12 h to + 72 h post-exercise). Countermovement jump height (CMJ) and movement velocity against the load that elicited a 1 m s
−1
mean propulsive velocity (V1) and 75% 1RM in the BP and SQ were used as mechanical indicators of neuromuscular performance.
Results
Training to muscle failure in each set 3 × 10(10), even when compared to completing the same total exercise volume 6 × 5(10), resulted in a significantly higher acute decline of CMJ and velocity against the V1 and 75% 1RM loads in both BP and SQ. In contrast, recovery from the 3 × 5(10) and 6 × 5(10) protocols was significantly faster between 24 and 48 h post-exercise compared to 3 × 10(10). Markers of acute (ammonia, growth hormone) and delayed (creatine kinase) fatigue showed a markedly different course of recovery between protocols, suggesting that training to failure slows down recovery up to 24–48 h post-exercise.
Conclusions
RT leading to failure considerably increases the time needed for the recovery of neuromuscular function and metabolic and hormonal homeostasis. Avoiding failure would allow athletes to be in a better neuromuscular condition to undertake a new training session or competition in a shorter period of time.
Following a program of resistance training, there are neural and muscular contributions to the gain in strength. Here, we measured changes in important central motor pathways during strength training ...in 2 female macaque monkeys. Animals were trained to pull a handle with one arm; weights could be added to increase load. On each day, motor-evoked potentials in upper limb muscles were first measured after stimulation of the primary motor cortex (M1), corticospinal tract (CST), and reticulospinal tract (RST). Monkeys then completed 50 trials with weights progressively increased over 8-9 weeks (final weight ∼6 kg, close to the animal's body weight). Muscle responses to M1 and RST stimulation increased during strength training; there were no increases in CST responses. Changes persisted during a 2 week washout period without weights. After a further 3 months of strength training, an experiment under anesthesia mapped potential responses to CST and RST stimulation in the cervical enlargement of the spinal cord. We distinguished the early axonal volley and later spinal synaptic field potentials, and used the slope of the relationship between these at different stimulus intensities as a measure of spinal input-output gain. Spinal gain was increased on the trained compared with the untrained side of the cord within the intermediate zone and motor nuclei for RST, but not CST, stimulation. We conclude that neural adaptations to strength training involve adaptations in the RST, as well as intracortical circuits within M1. By contrast, there appears to be little contribution from the CST.
We provide the first report of a strength training intervention in nonhuman primates. Our results indicate that strength training is associated with neural adaptations in intracortical and reticulospinal circuits, whereas corticospinal and motoneuronal adaptations are not dominant factors.
The purpose of this study was to determine whether time‐restricted eating (TRE), also known as time‐restricted feeding, was an effective dietary strategy for reducing fat mass and preserving fat‐free ...mass while evaluating changes in cardiometabolic biomarkers, hormones, muscle performance, energy intake, and macronutrient intake after aerobic and resistance exercise training in physically inactive and overweight or obese adults. This study was a randomized, controlled trial. Overweight and obese adults (mean ± SD; age: 44 ± 7 years; body mass index BMI: 29.6 ± 2.6 kg/m2; female: 85.7%) were randomly assigned to a TRE or normal eating (NE) dietary strategy group. The TRE participants consumed all calories between 12:00 p.m. and 8:00 p.m., whereas NE participants maintained their dietary habits. Both groups completed 8 weeks of aerobic exercise and supervised resistance training. Body composition, muscle performance, energy intake, macronutrient intake, physical activity, and physiological variables were assessed. A total of 21 participants completed the study (NE: n = 10; TRE: n = 11). A mild energy restriction was observed for TRE (~300 kcal/day, 14.5%) and NE (~250 kcal/day, 11.4%). Losses of total body mass were significantly greater for TRE (3.3%) relative to NE (0.2%) pre‐ to post‐intervention, of which TRE had significantly greater losses of fat mass (9.0%) compared to NE (3.3%). Lean mass increased during the intervention for both TRE (0.6%) and NE (1.9%), with no group differences. These data support the use of TRE and concurrent exercise training as a short‐term dietary strategy for reducing fat mass and increasing lean mass in overweight and obese adults.
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