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PubMed2005

Two exercise interventions for the management of patients with ankylosing spondylitis: a randomized controlled trial.

OBJECTIVE: The purpose of this clinical trial was to evaluate the impact of a 4-month comprehensive protocol of strengthening and flexibility exercises developed by our research group versus conventional exercises for patients with Ankylosing Spondylitis (AS) on functional and mobility outcomes. DESIGN: Randomized controlled trial. Forty-five patients diagnosed with AS according to the modified criteria of New York were allocated to control or experimental groups using a random numbers table. The control group was treated with a conventional protocol of physical therapy in AS, whereas the experimental group was treated with the protocol suggested by our research group. The conventional intervention consisted of 20 exercises: motion and flexibility exercises of the cervical, thoracic, and lumbar spine; stretching of the shortened muscles; and chest expansion exercises. The experimental protocol is based on the postural affectation of the AS and the treatment of the shortened muscle chains in these patients according to the Global Posture Reeducation (GPR) method. This intervention employs specific strengthening and flexibility exercises in which the shortened muscle chains are stretched and strengthened. The study lasted 4 mos. During this period, patients received a weekly group session managed by an experienced physiotherapist. Each session lasted an hour, and there were 15 total sessions. Changes in activity, mobility, and functional capacity were evaluated by an assessor blinded to the intervention, using the following previously validated scores from the Bath group: BASMI (tragus to wall distance, modified Schober test, cervical rotation, lumbar side flexion, and intermalleolar distance), BASDAI (The Bath Ankylosing Spondylitis Disease Activity Index), and BASFI (The Bath Ankylosing Spondylitis Functional Index). RESULTS: Both groups showed an improvement (prepost scores) in all the outcome measures, mobility measures of the BASMI index, as well as in BASFI and BASDAI indexes. In the control group, the improvement in tragus to wall distance (P=0.009) and in lumbar side flexion (P=0.02) was statistically significant. Although the rest of the outcomes also improved, they did not reach a significant level (P>0.05). In the experimental group, the improvement in all the clinical measures of the BASMI index (P<0.01) and in the BASFI index (P=0.003) was statistically significant. The intergroup comparison between the improvement (prepost scores) in both groups showed that the experimental group obtained a greater improvement than the control group in all the clinical measures of the BASMI index, except in tragus to wall distance, as well as in the BASFI index. CONCLUSIONS: The experimental protocol developed by our research group, based on the GPR method and specific strengthening and flexibility exercises of the muscle chains, offers promising results in the management of patients suffering from AS. Further trials on this topic are required.

Activities of Daily Living↗

PubMed1987

Fatigue during stretch-shortening cycle exercises. II. Changes in neuromuscular activation patterns of human skeletal muscle.

Detailed electromyographic (EMG) analysis of primarily triceps brachii muscle was carried out on subjects who performed 100 repeated and exhaustive stretch-shortening cycle (SSC) exercises on a special sledge apparatus incorporating a force plate. The fatigue contractions were performed on submaximal levels but the before-after comparison included also maximal "drop jumps" on the sledge as well as falls on to the floor. SSC contractions caused clear reduction in the mechanical performance capacity of the muscles. EMG analysis revealed that integrated EMG (IEMG) increased during the course of fatigue both during eccentric and concentric phases of the cycle. However, when IEMG was time-normalized, the changes were nonsignificant. The IEMG/force ratio increased especially during the eccentric phase both in submaximal and maximal drops. In maximal drops, there was also a great reduction in concentric IEMG. Rectified EMG curves were also averaged in blocks of ten successive fatigue contractions. This analysis revealed clear appearance of short (SLC), medium (MLC), and long (LLC) latency reflex components in most of the subjects during the early contact on the platform. The fatigue effects on these components were individual and also condition dependent so that in maximal drops there was a trend for reflex potentiation. In maximal drops on to the floor, which represented the highest stretch loads on the muscles, there was a tendency for reduction of amplitudes of the reflex components. The results suggest that in exhaustive SSC exercise muscular activation processes are reduced and primarily in the eccentric phase. Muscle spindles are suggested to become differentially affected by fatigue substances depending on the load intensity during eccentric contraction.

Biomechanical Phenomena↗

PubMed2004

Passive triceps surae stretch inhibits vasoconstriction in the nonexercised limb during posthandgrip muscle ischemia.

We investigated whether selective muscle mechanoreceptor activation in the lower limb opposes arm muscle metaboreceptor activation-mediated limb vasoconstriction. Seven subjects completed two trials: one control trial and one stretch trial. Both trials included 2 min of handgrip and 2 min of posthandgrip exercise muscle ischemia (PEMI). In the stretch trial, a 2-min sustained triceps surae stretch, by brief passive dorsiflexion of the right foot, was performed simultaneously during PEMI. Mean arterial pressure, heart rate, and forearm blood flow (FBF) in the nonexercised arm and forearm vascular conductance (FVC) in the nonexercised arm were measured. During PEMI in the control trial, mean arterial pressure was significantly greater and FBF and FVC were significantly lower than baseline values (P < 0.05 for each). In contrast, FBF and FVC during PEMI in the stretch trial exhibited different responses than in the control trial. FBF and FVC were significantly greater in the stretch trial than in the control trial (FBF, 5.5 +/- 0.4 vs. 3.8 +/- 0.4 ml x 100 ml(-1) x min(-1); FVC, 0.048 +/- 0.004 vs. 0.033 +/- 0.003 unit, respectively; P < 0.05). These results indicate that passive triceps surae stretch can inhibit vasoconstriction in the nonexercised forearm mediated via muscle metaboreceptor activation in the exercised arm.

Adult↗

PubMed1998

Reduced stretch reflex sensitivity and muscle stiffness after long-lasting stretch-shortening cycle exercise in humans.

It has been suggested that during repeated long-term stretch-shortening cycle (SSC) exercise the decreased neuromuscular function may result partly from alterations in stiffness regulation. Therefore, interaction between the short latency stretch-reflex component (M1) and muscle stiffness and their influences on muscle performance were investigated before and after long lasting SSC exercise. The test protocol included various jumps on a sledge ergometer. The interpretation of the sensitivity of the reflex was based on the measurements of the patellar reflexes and the M1 reflex components. The peak muscle stiffness was measured indirectly and calculated as a coefficient of the changes in the Achilles tendon force and the muscle length. The fatigue protocol induced a marked impairment of the neuromuscular function in maximal SSC jumps. This was demonstrated by a 14.1%-17.7% (n.s. - P < 0.001) reduction in the mean eccentric forces and a 17.3%-31.8% (n.s. - P < 0.05) reduction in the corresponding M1 area under the electromyograms. Both of these methods of assessing the short latency reflex response showed a clear deterioration in the sensitivity of the reflex after fatigue (P < 0.05-0.001). This was also the case for the eccentric peak stiffness of the soleus muscle which declined immediately after fatigue by 5.4% to 7.1% (n.s. - P < 0.05) depending on the jump condition. The results observed would suggest that the modulation of neural input to the muscle was at least partly of reflex origin from the contracting muscle, and furthermore, that the reduced muscle stiffness which accompanied the decreased reflex sensitivity could have been partly responsible for the weakened muscle performance due to impaired utilization of elastic energy.

Adult↗

PubMed2004

Skeletal muscle function: role of ionic changes in fatigue, damage and disease.

1. Repeated activity of skeletal muscle causes a variety of changes in its properties: muscles become weaker with intense use (fatigue), may feel sore and weak after repeated contractions involving stretch and can degenerate in some disease conditions. The present review considers the role of early ionic changes in the development of each of these conditions. 2. Single fibre preparations of mouse muscle were used to measure ionic changes following activity induced changes in function. Single fibres were dissected with intact tendons and stimulated to produce force. Fluorescent indicators were microinjected into the fibres to allow simultaneous ionic measurements with determination of mechanical performance. 3. One theory to explain muscle fatigue is that fatigue is caused by the accumulation of lactic acid, producing an intracellular acidosis that inhibits the myofibrillar proteins. In contrast, we found that during repeated tetani there was little or no pH change, but that failure of calcium release was a major contributor to fatigue. Currently, it is proposed that precipitation of calcium and phosphate in the sarcoplasmic reticulum contributes to the failure of calcium release. 4. Muscles can be used to shorten and produce force or they can be used to de-accelerate loads (stretched or eccentric contractions). One day after intense exercise involving stretched contractions, muscles are weak, sore and tender, and this damage can take a week to recover. In this condition, sarcomeres are disorganized and there are increases in resting intracellular Ca2+ and Na+. Recently, we demonstrated that the elevation of Na+ occurs through a stretch-activated channel that can be blocked by either gadolinium or streptomycin. Preventing the increase in [Na+]i with gadolinium also prevented part of the muscle weakness after stretched contractions. 5. Duchenne muscular dystrophy is a lethal degenerative disease of muscles in which the protein dystrophin is absent. Dystrophic muscles are more susceptible to stretch-induced muscle damage and the stretch-activated channel seems to be one pathway for the increases in intracellular Ca2+ and Na+ that are a feature of this disease. We have shown recently that blockers of the stretch-activated channel can minimize some of the short-term damage in muscles from the mdx mouse, which also lacks dystrophin. Currently, we are testing whether blockers of the stretch-activated channels given systemically to mdx mice can protect against some features of the disease.

Animals↗

PubMed2025

Genome-Wide Association Study on Muscle Stiffness Identified Novel Locus for Predisposition to Muscle Strain Injury.

PURPOSE: We aimed to screen the entire genome for genetic variants associated with passive muscle stiffness, which has been suggested as a risk factor for muscle strain injury. METHODS: This genome-wide association study (GWAS) on passive muscle stiffness included 350 physically active young Japanese individuals. Three hamstring constituents were measured using ultrasound shear wave elastography. Skeletal muscle transcriptomes were compared across the genotypes of GWAS-identified variants in 48 healthy Japanese individuals. Association between GWAS-identified variants and history of muscle strain injury was examined in 1428 Japanese athletes. RESULTS: Two loci on chromosome 11 demonstrated a genome-wide significant association with passive muscle stiffness of the biceps femoris long head (rs12807854 T/C: P = 5.19 × 10 -10 , rs78405694 T/C: P = 2.09 × 10 -8 ; linear regression analysis adjusted for sex, age, and stretching exercise habits). Skeletal muscle RNA sequencing revealed significantly elevated expression of extracellular matrix-related genes in muscles carrying stiffness-increasing alleles of these variants. Among athletes, rs12807854 T/C was significantly associated with a history of muscle strain injury ( P = 0.0254; logistic regression analysis adjusted for age, sex, competitive level, and main sport). Carriers of the C allele, associated with increased muscle stiffness, exhibited a heightened risk of muscle strain injury (odds ratio = 1.62; 95% confidence interval = 1.06-2.47 per C allele increase). By contrast, rs78405694 did not show a significant association with muscle strain injury in this population. CONCLUSIONS: A novel locus associated with passive muscle stiffness and muscle strain injury was identified. Elucidating the detailed mechanisms linking the identified locus to passive muscle stiffness may lead to the development of new strategies to prevent muscle strain injuries.

Humans↗

PubMed2003

Voluntary activation and mechanical performance of human triceps surae muscle after exhaustive stretch-shortening cycle jumping exercise.

The purpose of this study was to examine neuromuscular factors that may contribute to post exercise force loss and subsequent recovery after exhaustive stretch-shortening cycle (SSC) exercise. Six subjects were fatigued on a sledge apparatus by 100 maximal rebound jumps followed by continuous submaximal jumping until complete exhaustion. Exercise-induced changes in neuromuscular performance were followed up to 7 days post exercise. The total number of jumps in the SSC exercise ranged from 336 to 1392. The SSC exercise induced a significant immediate plantarflexion torque decline of 29, 38 and 44% ( P<0.05) in maximal voluntary contraction and evoked maximal twitch and low-frequency (LF) stimulation, respectively. The higher the number of jumps in the SSC exercise the larger was the post exercise reduction in voluntary activation as well as in contractile force ( r=-0.94, P<0.01, in both). Furthermore, a higher number of jumps augmented a delayed force recovery and late decline in stretch reflex EMG response ( r=-0.94, P<0.01). Clear differences were found in central and peripheral adaptation to the exhaustive SSC exercise between the subjects. The magnitude of post exercise contractile and activation failure as well as the delayed recovery of neuromuscular performance may have been augmented in some subjects due to their high number of jumps in the exercise.

Adaptation, Physiological↗

PubMed2000

Effects of short-term pulmonary rehabilitation on exercise capacity and quality of life in patients with chronic obstructive pulmonary disease.

Although the rehabilitation of patients with chronic obstructive pulmonary disease (COPD) improves both exercise capacity and quality of life, a standard protocol for COPD patients has not been established. To clarify whether physiologic and quality-of-life improvements can be achieved by an inpatient pulmonary rehabilitation program 5 days per week for 3 weeks, 18 patients with COPD were enrolled in a rehabilitation program. The physical exercise training regimen consisted of respiratory muscle stretch gymnastics and cycle ergometer exercise training. Pulmonary function tests, an incremental ergometer exercise test, a 6-min walking test, and a quality of life assessment by the Chronic Respiratory Questionnaire were administered before and after the program. The peak VO2, an indicator of maximal exercise capacity, did not increase, although the 6-min walking distance, an indicator of functional exercise capacity, increased significantly after rehabilitation. There was a significant improvement in the quality of life in terms of dyspnea, fatigue, and emotional state. These findings suggest that even a 3-week program may be beneficial for COPD patients. Increases in functional exercise capacity, even without an increase in maximal exercise capacity, are helpful for reducing dyspnea and improving quality of life parameters in patients with COPD.

Aged↗

PubMed1987

Effect of stretch exercises on suxamethonium induced fasciculations and myalgia.

Muscle fasciculations and pain following the administration of suxamethonium were assessed in a group of patients who performed a series of stretch exercises approximately 1 h before operation. Comparison was made with a group who received suxamethonium but no pretreatment. Fasciculations were significantly reduced in the exercised group, and the incidence of muscle pain decreased from 52% in the untreated group to 12% in the exercised group. A significant relationship was shown between the severity of visible fasciculations and muscle pain.

Adult↗

PubMed2001

Is passive stiffness in human muscles related to the elasticity of tendon structures?

The purpose of this study was to examine in vivo whether passive stiffness in human muscles was related to the elasticity of tendon structures and to performance during stretch-shortening cycle exercise. Passive torque of plantar flexor muscles was measured during passive stretch from 90 degrees (anatomical position) to 65 degrees of dorsiflexion at a constant velocity of 5 degrees.s-1. The slope of the linear portion of the passive torque-angle curve during stretching was defined as the passive stiffness of the muscle. The elongation of the tendon and aponeurosis of the medial gastrocnemius muscle (MG) was directly measured using ultrasonography during ramp isometric plantar flexion up to the voluntary maximum. The relationship between the estimated muscle force of MG and tendon elongation was fitted to a linear regression, the slope of which was defined as the stiffness of the tendon. In addition, the dynamic torques during maximal voluntary concentric plantar flexion with and without prior eccentric contraction were determined at a constant velocity of 120 degrees.s-1. There were no significant correlations between passive stiffness and either the tendon stiffness (r = 0.19, P > 0.05) or the relative increase in torque with prior eccentric contraction (r = -0.19, P > 0.05). However, tendon stiffness was negatively correlated to the relative increase in torque output (r = -0.42, P < 0.05). The present results suggested that passive stiffness was independent of the elasticity of tendon structures, and had no favourable effect on the muscle performance during stretch-shortening cycle exercise.

Adult↗

PubMed2005

[Primary prevention program of the Hungarian Spine Society--part I. Scientific background of the posture correction exercise scheme].

The primary prevention program of the Hungarian Spine Society aims to increase awareness of the need to develop and automatically maintain a biomechanically correct posture for all school children. The biomechanically correct posture is a dynamic balance based on a correct middle position of the pelvis and on muscle balance. In this position three important anatomical points--the left and right anterior superior iliac spines and the upper medial point of the pubic bone--form one frontal plane. From side-view the imaginary weight median of the body crosses the 2nd to 5th lumbar and the 2nd to 5th cervical vertebral bodies. When the muscles involved in posture are in balance, their strength and flexibility are just appropriate for the almost continuous work required against gravity. In case of static and/or dynamic under- or overload tonic muscles become shortened, and phasic muscles become stretched, and are no longer able to work optimally. Since many muscles and muscle parts that are involved in normal posture maintenance are not satisfactorily challenged in regular physical exercises and sport activities, the preventive exercise scheme of the Hungarian Spine Society aimed to involve these rarely used muscles in special strengthening and stretching exercises. The scheme is based on 12 test exercises that assess the strength and flexibility of postural muscles. A person who is able to do all test exercises correctly has no problem with his or her muscle balance. In order to counteract the harm caused by sedentary lifestyle already in childhood, regular use of this posture correction scheme in physical education starting from preschool throughout the school-years is recommended for all children.

Biomechanical Phenomena↗

PubMed2005

Stretch-shortening cycle exercises: an effective training paradigm to enhance power output of human single muscle fibers.

Functional performance of lower limb muscles and contractile properties of chemically skinned single muscle fibers were evaluated before and after 8 wk of maximal effort stretch-shortening cycle (SSC) exercise training. Muscle biopsies were obtained from the vastus lateralis of eight men before and after the training period. Fibers were evaluated regarding their mechanical properties and subsequently classified according to their myosin heavy chain content (SDS-PAGE). After training, maximal leg extensor muscle force and vertical jump performance were improved 12% (P<0.01) and 13% (P<0.001), respectively. Single-fiber cross-sectional area increased 23% in type I (P<0.01), 22% in type IIa (P<0.001), and 30% in type IIa/IIx fibers (P<0.001). Peak force increased 19% in type I (P<0.01), 15% in type IIa (P<0.001), and 16% in type IIa/IIx fibers (P<0.001). When peak force was normalized with cross-sectional area, no changes were found for any fiber type. Maximal shortening velocity was increased 18, 29, and 22% in type I, IIa, and hybrid IIa/IIx fibers, respectively (P<0.001). Peak power was enhanced in all fiber types, and normalized peak power improved 9% in type IIa fibers (P<0.05). Fiber tension on passive stretch increased in IIa/IIx fibers only (P<0.05). In conclusion, short-term SSC exercise training enhanced single-fiber contraction performance via force and contraction velocity in type I, IIa, and IIa/IIx fibers. These results suggest that SSC exercises are an effective training approach to improve fiber force, contraction velocity, and therefore power.

Adult↗

PubMed1994

Anterior ischemic optic neuropathy in Graves' disease.

Optic neuropathy occurred in two patients suffering from Graves' disease with marked limitation of eye movement. Optic nerve changes were moderate. They consisted of parapapillary flame-shaped hemorrhages, swelling of the disc, and bundle defects in the visual field on the involved side. This clinical pattern suggested that the optic neuropathy was anterior and ischemic in nature. In one patient, symptoms of optic neuropathy were noted 3 days after starting stretching exercises with the ocular muscles, performed following a friend's advice in an attempt to prevent increase in restrictive myopathy. In patients with Graves' disease, it is conceivable that mild optic neuropathy occasionally occurs as a result of elevation in intraocular pressure, and stretching exercises of the ocular muscles might consequently favor such ischemic events. In the mechanisms of optic nerve involvement associated with Graves' disease, the role of ischemia should be considered in addition to the widely accepted role of optic nerve compression by enlarged extraocular muscles, at the level of the orbital apex.

Female↗

PubMed1996

Effects of differently induced stretch loads on neuromuscular control in drop jump exercise.

The neuromuscular characteristics of the triceps surae and vastus lateralis muscles and interactions between the pre-activation of these muscles and the muscle output itself during ground contact were investigated during various types of stretch-shortening cycle muscle loading. The loading of the muscles was effected by using three different types of drop jump exercise. These jumps allowed separate modifications of the loading of the leg extensor muscles by changing the velocity of the centre of gravity (CG) or by changing directly the body mass, which was also affected by changing artificially the acceleration of the CG. It was found that the eccentric peak angular velocity of the ankle joint was related to the various precontact and eccentric parameters in all the different types of jumping exercise. The correlations were higher for the gastrocnemius muscle (P < 0.001) than for the soleus muscle (n.s., P < 0.01). In all the experimental conditions, the pre-activation of the measured muscles started well before the impact of contact with the ground. However, the duration of the pre-activation phase depended on the type of stretch exercise. The results would suggest a clear interaction between the pre-activation of the muscles and that part of the muscle output which is effected by the segmental stretch reflex system. The control mechanism of the pre-activation itself appears to be multiple in character. It seems reasonable to assume that the pre-activation is preprogrammed, but which can, however, be modified by proprioceptive, vestibular and visual inputs. Thus, the possibility of conscious modification of the expected muscle load must be considered.

Adult↗

PubMed1988

Calf enlargement associated with neurologic disease: two uncommon cases.

Muscle enlargement and hypertrophy are rare findings in neurogenic lesions. The two in combination have been reported in cases of peripheral nerve lesions, polyneuropathy, and poliomyelitis. True and pseudo muscle hypertrophy are the two possible etiologies, whereas infiltration, stretch, or exercise of the muscle are the causative factors. We report two cases of unilateral calf enlargement, one occurring after surgery for S1 radiculopathy with associated cramping, and the other after poliomyelitis.

Adult↗

PubMed2002

Exercise, diet, and skeletal muscle gene expression.

Skeletal muscle, as a consequence of its mass and great capacity for altered metabolism, has a major impact on whole-body metabolic homeostasis and is capable of remarkable adaptation in response to various physiological stimuli, including exercise and dietary intervention. Exercise-induced increases in skeletal muscle mRNA levels of a number of genes have been reported, due to transcriptional activation and/or increased mRNA stability. The cellular adaptations to exercise training appear to be due to the cumulative effects of transient increases in gene transcription after repeated exercise bouts. The relative importance of transcriptional (mRNA synthesis) and translational (mRNA stability or translational efficiency) mechanisms for the training-induced increases in skeletal muscle protein abundance remains to be fully elucidated. Dietary manipulation, and the associated alterations in nutrient availability and hormone levels, can also modify skeletal muscle gene expression, although fewer studies have been reported. A major challenge is to understand how exercise and diet exert their effects on gene and protein expression in skeletal muscle. In relation to exercise, potential stimuli include stretch and muscle tension, the pattern of motor nerve activity and the resultant calcium transients, the energy charge of the cell and substrate availability, oxygen tension and circulating hormones. These are detected by various cellular signaling mechanisms, acting on a range of downstream targets and a wide range of putative transcription factors. A key goal in the years ahead is to identify how alterations at the level of gene expression are coupled to the changes in skeletal muscle phenotype. It is clear that gene expression, although representing a specific site of regulation, is only one step in a complex cascade from the initial stimulus to the final phenotypic adaptation and integrated physiological response.

Adaptation, Physiological↗

PubMed2005

Health-related quality of life and sickness absence in community nursing home employees: randomized controlled trial of physical exercise.

BACKGROUND: It is a common belief that physical exercise at the workplace decreases subjective health complaints and reduces sickness absence, but this is not supported by previous randomized studies. AIMS: To evaluate the effectiveness of physical exercise at the workplace. METHODS: One hundred and twenty-nine employees in a community-based nursing home for the elderly were randomized into physical exercise or control groups. A weekly exercise class consisting of light aerobic exercise, muscle strengthening and stretching was held for a 6-month period. The control group was told to continue their ordinary activity. The main outcome measures were aerobic fitness (UKK, walking test), health-related quality of life (COOP/WONCA) and sickness absence. Blinded assessments were carried out at baseline and following the 6-month intervention. Complete sickness absence data were collected from a community register for two comparable 7-month periods. RESULTS: The average number of exercise sessions was 12 (0-26). Self-reported physical activity increased in the intervention group compared with the control group (P < 0.01). Aerobic fitness improved in both groups (P < 0.01). Mean sickness absence increased from 6.8 to 15.6 days in the exercise group and from 10.4 to 14.5 in the control group. No differences between groups were found for aerobic fitness, health-related quality of life or sickness absence. CONCLUSION: The intervention neither improved health-related quality of life nor reduced sickness absence.

Adult↗

PubMed2002

The effect of either a pre or post exercise stretch on straight leg raise range of motion (SLR-ROM) in females.

This study examined the order effect of a hamstring muscle stretch and resisted hamstring exercises on straight leg raise range of movement (SLR-ROM), in a group of twenty females aged 20-34 years. The stretch was applied either immediately before or Immediately after a resisted hamstring exercise. Exercise significantly decreased SLR-ROM (p < 0.05) and stretching significantly increased SLR-ROM (p < 0.05). The overall change in SLR-ROM for the two groups showed that a significant increase in SLR-ROM was detected (at a low force level) in Group 1 subjects who performed exercise and then stretched. A non-significant increase in SLR-ROM was detected by the higher force level in Group 1 subjects. In contrast, Group 2 subjects (stretch then exercise) showed a non-significant reduction in SLR-ROM at both levels of force.

Adult↗