Abstract：
:We studied the sensitivity of electromyographic (EMG) variables to load and muscle fatigue during continuous and intermittent incremental cycling. Fifteen men attended three laboratory sessions. Visit 1: lactate threshold, peak power output, and VO2max . Visits 2 and 3: Continuous (more fatiguing) and intermittent (less fatiguing) incremental cycling protocols [20%, 40%, 60%, 80% and 100% of peak power output (PPO)]. During both protocols, multichannel EMG signals were recorded from vastus lateralis: muscle fiber conduction velocity (MFCV), instantaneous mean frequency (iMNF), and absolute and normalized root mean square (RMS) were analyzed. MFCV differed between protocols (P < 0.001), and only increased consistently with power output during intermittent cycling. RMS parameters were similar between protocols, and increased linearly with power output. However, only normalized RMS was higher during the more fatiguing 100% PPO stage of the continuous protocol [continuous-intermittent mean difference (95% CI): 45.1 (8.5% to 81.7%)]. On the contrary, iMNF was insensitive to load changes and muscle fatigue (P = 0.14). Despite similar power outputs, continuous and intermittent cycling influenced MFCV and normalized RMS differently. Only normalized RMS was sensitive to both increases in power output (in both protocols) and muscle fatigue, and thus is the most suitable EMG parameter to monitor changes in muscle activation during cycling.
journal_name
Scand J Med Sci Sportsjournal_title
Scandinavian journal of medicine & science in sportsauthors
Martinez-Valdes E,Guzman-Venegas RA,Silvestre RA,Macdonald JH,Falla D,Araneda OF,Haichelis Ddoi
10.1111/sms.12578subject
Has Abstractpub_date
2016-11-01 00:00:00pages
1273-1282issue
11eissn
0905-7188issn
1600-0838journal_volume
26pub_type
杂志文章abstract：:In military operations, declined physical capacity can endanger the life of soldiers. During special support and reconnaissance (SSR) missions, Special Forces soldiers sustain 1-2 weeks full-body horizontal immobilization, which impairs muscle strength and performance. Adequate muscle mass and strength are necessary i...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.12170
更新日期：2015-04-01 00:00:00
abstract：:The aim of this study was to examine whether early and sustained organized youth sport during childhood and adolescence predicts the frequency of leisure-time physical activity (PA) at age 23 years. A 10-year longitudinal study of 630 adolescents was conducted. Data were collected from these participants eight times f...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2008.00850.x
更新日期：2009-10-01 00:00:00
abstract：:Our aim was to investigate the presence of mechanical hypersensitivity and active trigger points (TrPs) in the neck-shoulder muscles in elite swimmers with/without unilateral shoulder pain. Seventeen elite swimmers with shoulder pain; 18 swimmers without shoulder pain; and 15 elite athletes matched controls were recru...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/j.1600-0838.2011.01331.x
更新日期：2013-02-01 00:00:00
abstract：:This study aimed to validate the use of a single blood lactate concentration measurement taken following a 5-minute running bout at 10 km·h-1 (BLC10 ) and the speed associated with 90% of maximal heart rate (S90 ) to predict and monitor fixed blood lactate concentration (FBLC) thresholds in athletes. Three complementa...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.12853
更新日期：2017-05-01 00:00:00
abstract：:The molecular mechanisms involved in the aging of collagen and consequent increase in mechanical strength and stiffness occur in a series of enzymic and non-enzymic intermolecular cross-links. The enzymic mechanism involves divalent aldimine intermolecular cross-links derived from the reaction of aldehydes which then ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2005.00464.x
更新日期：2005-08-01 00:00:00
abstract：:It is recognized that stretching is an effective method to chronically increase the joint range of motion. However, the effects of stretching training on the muscle-tendon structural properties remain unclear. This systematic review with meta-analysis aimed to determine whether chronic stretching alter the muscle-tend...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,meta分析,评审
doi：10.1111/sms.12957
更新日期：2018-03-01 00:00:00
abstract：:Sport injury epidemiology has received increased recognition as a field of sport medicine research that can improve the health and safety of athletes. Injuries among Paralympic powerlifters have not previously been systematically studied. The purpose of this prospective cohort study was to characterize injuries among ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.12554
更新日期：2016-10-01 00:00:00
abstract：:Little is known about long-term effects of neonatal intensive care on exercise capacity, physical activity, and fatigue in term borns. We determined these outcomes in 57 young adults, treated for neonatal respiratory failure; 27 of them had congenital diaphragmatic hernia with lung hypoplasia (group 1) and 30 had norm...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2012.01491.x
更新日期：2014-02-01 00:00:00
abstract：:The aim of this prospective cohort study was to investigate the nature and risk factors of injuries leading to hospitalization. A cohort of 57 407 Finns aged 14-18 years was followed in the Hospital Discharge Register for an average of 10.6 years, totaling 608 990 person-years. We identified 5889 respondents (10.3%) w...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2008.00800.x
更新日期：2009-04-01 00:00:00
abstract：:We use a multivariate multilevel model to study the links between physical fitness (PF) and gross motor coordination (GMC) and investigate the influence of predictors affecting their levels across age. We sampled 7918 Peruvians, aged 6-15 years, from sea-level, Amazon region and high-altitude. Composite markers of GMC...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13807
更新日期：2020-12-01 00:00:00
abstract：BACKGROUND:To determine the trustworthiness of graded exercise test to exhaustion (GXT) to assess maximal oxygen uptake ( V ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13602
更新日期：2020-03-01 00:00:00
abstract：:We examined the effects of a 12-week program of Nordic hamstring exercises (NHE), administered before or after football training, upon eccentric hamstring strength, muscle activity, and architectural adaptations. Amateur soccer players were randomized into three groups. The control group (CON; n=11) undertook core sta...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/sms.12925
更新日期：2018-02-01 00:00:00
abstract：:The aim of this study was to test the hypothesis that, in comparison with standard postures, aero posture (AP) would modify the coordination of lower limb muscles during pedalling and consequently would influence the pedal force production. Twelve triathletes were asked to pedal at an intensity near the ventilatory th...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2007.00765.x
更新日期：2009-02-01 00:00:00
abstract：:The aim of the study was to estimate active knee flexion and active knee extension in athletes and to investigate the potential association of each to different types of sports activity. Active knee extension and active knee flexion was measured in 339 athletes. Active knee extension was significantly higher in women ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.1999.tb00212.x
更新日期：1999-04-01 00:00:00
abstract：:The purpose of this study was to investigate the influence of perceived motivational climate and gender on sportspersonship behavior of competitive youth football players. Participants were 512 boy and 202 girl Norwegian youth football players (12-14 years old) competing in an international football tournament. A 2 x ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2003.00320.x
更新日期：2004-06-01 00:00:00
abstract：:The aim of the present study was to examine the associations between adaptive responses to an in-season soccer training camp in the heat and changes in submaximal exercising heart rate (HRex, 5-min run at 9 km/h), postexercise HR recovery (HRR) and HR variability (HRV). Fifteen well-trained but non-heat-acclimatized ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2011.01378.x
更新日期：2011-12-01 00:00:00
abstract：:The objective of this study was to identify the association of phase angle with physical fitness in children and adolescents infected with HIV. Sixty-four children and adolescents infected with HIV (8-15 years old) were tested for vertical transmission. The electrical bioimpedance was used to obtain the phase angle. B...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13419
更新日期：2019-07-01 00:00:00
abstract：:Experimental studies have reported that aerobic exercise after asthma induction reduces lung inflammation and remodeling. Nevertheless, no experimental study has analyzed whether regular/moderate aerobic training before the induction of allergic asthma may prevent these inflammatory and remodeling processes. For this ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.12614
更新日期：2016-11-01 00:00:00
abstract：:This study compared the physical performance of adolescents in 1997 and 1968. The material included 1329 15-year-old Norwegian adolescents in Akershus county in Norway in 1968, and 1105 15-year-old adolescents in the same region in 1997. The investigations were supervised by the same conductor on both occasions, and u...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2006.00597.x
更新日期：2007-10-01 00:00:00
abstract：:The purpose of this study was to compare the effects of 3 weeks with three weekly sessions (ie, nine sessions in total) of short intervals (SI; n = 9; 3 series with 13 × 30-second work intervals interspersed with 15-second recovery and 3-minutes recovery between series) against effort-matched (rate of perceived effort...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13627
更新日期：2020-05-01 00:00:00
abstract：:Internet websites offering androgenic anabolic steroids (AAS) were identified and available products were examined. Keywords for the website search were: "anabolic steroids," "anabolic steroids buy," "anabolic steroid purchase." The first 10 websites offering AAS in the first 10 pages of results were considered. At le...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2010.01263.x
更新日期：2011-12-01 00:00:00
abstract：:This study aimed to determine simultaneously the effects of plyometric training on the passive stiffness of the ankle joint musculo-articular complex, the gastrocnemii muscle-tendon complex (MTC) and the Achilles tendon in order to assess possible local adaptations of elastic properties. Seventeen subjects were divide...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/j.1600-0838.2008.00853.x
更新日期：2009-12-01 00:00:00
abstract：PURPOSE:Grounded in the Cognitive Evaluation Theory, the present experiment aimed to compare the relative impact of competence support provided by coaches versus athlete leaders on players' competence satisfaction, intrinsic motivation, and performance. METHODS:We recruited 18 existing competitive male basketball team...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13273
更新日期：2018-12-01 00:00:00
abstract：:The exercise intensity eliciting maximal fat oxidation (Fat(max)) is typically determined during an incremental test. Its reproducibility, however, has not been thoroughly investigated so far. To address this issue, 21 healthy subjects (23.5+/-1.7 years; BMI 22.4+/-1.8 kg/m(2); VO(2peak) 47.4+/-11.3 mL/min/kg) carried...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2008.00775.x
更新日期：2009-04-01 00:00:00
abstract：:Elite athletes often find themselves in a dilemma between maintaining optimal health to be successful and accepting health risks by pushing their physical limits. For elite adolescent athletes, this dilemma becomes a trilemma as they are also confronted with developmental challenges typical for adolescence. As many ad...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/j.1600-0838.2012.01472.x
更新日期：2014-02-01 00:00:00
abstract：:Repetition of jumps in dance and sport training poses a potential injury risk; however, non-contact landing injuries are more common in athletes than dancers. This study aimed to compare the lower limb stiffness characteristics of dancers and athletes during drop landings to investigate possible mechanisms of impact-r...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.13309
更新日期：2019-01-01 00:00:00
abstract：:Lower energy cost of running (Cr) has been reported when wearing minimal (MS) vs traditional shoes (TS) on level terrain, but the effect of slope on this difference is unknown. The aim of this study was to compare Cr, physiological, and kinematic variables from running in MS and TS on different slope conditions. Fourt...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/sms.12057
更新日期：2013-08-01 00:00:00
abstract：:Increasing skeletal muscle carnitine availability alters muscle metabolism during steady-state exercise in healthy humans. We investigated whether elevating muscle carnitine, and thereby the acetyl-group buffering capacity, altered the metabolic and physiological adaptations to 24 weeks of high-intensity interval trai...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/sms.12885
更新日期：2018-01-01 00:00:00
abstract：:Perceived health and physical fitness have been shown to correlate, and low levels of either variable increase the risk for future illness and mortality. However, risk factors and their interrelationship may vary between societies and over time. In this study, the associations of physical fitness and perceived health ...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章
doi：10.1111/sms.12943
更新日期：2018-02-01 00:00:00
abstract：:The study was a two-armed, parallel group, cluster randomized controlled trial in which 15 teams (160 players) were assigned to either an experimental group (EG, 8 teams n = 86), which warmed-up with bodyweight neuromuscular exercises, or a control group (CG, 7 teams, n = 74) that performed standard tactical-technical...
journal_title：Scandinavian journal of medicine & science in sports
pub_type： 杂志文章,随机对照试验
doi：10.1111/sms.13034
更新日期：2018-04-01 00:00:00
